Sprocket Types & Size Chart (Pitch Diameter, Specs, Uses, Design) | Chain Sprocket Catalogue

A sprocket is a core part for power transmission and chain management in motorcycles, conveyors, and all sorts of machinery. The choice of sprocket affects how your equipment performs, how often you need to service it, and how your chain and drivetrain feel on the road or in the factory. Today’s topic is sprocket catalogue – types, specs (mounting, chain standard, hub, profile, material, and key sizes), uses, customer priorities, and design.

What Is a Sprocket?

A sprocket is a profiled wheel with teeth that mesh into a chain track or other perforated device in order to transmit mechanical power. This transmission of mechanical power allows sprockets to be used to transfer rotary motion between two shafts or to provide linear motion. Sprockets are simple but provide a unique control system for many industrial uses. These include agricultural equipment, automotive equipment, conveyor belts, power transmission equipment, bulldozers, and more. Sprockets are an effective source of mechanical power.

Is a sprocket the same as a gear? No, comparable to a gear, sprockets are never directly meshed together. They always operate with a chain connecting them.

Sprocket Structure

A sprocket consists of its circular base, crowned tooth elements, and the chain or track it interacts with. There are multiple types of sprockets depending on various characteristics, such as the number of teeth.

How Does a Sprocket Work With a Chain?

The basic principle is that the wheel with teeth engages with an element (like a chain) that is pulled over the wheel as it rotates. This is achieved by the crowned tooth elements fitting into the chain. A motion or force drives the wheel, which in turn drives the chain, transmitting power or changing the torque and speed of the mechanical system.

The front sprocket usually spins faster and is made from harder steel. It tends to wear out first. On some motorcycles, you can extend its life by flipping it over if the design allows. The rear sprocket, being larger and made from softer steel, lasts longer but is not reversible. Both should be replaced together with the chain for best results.

Changing sprocket sizes changes how your vehicle responds. A larger front sprocket increases top speed but reduces acceleration. A smaller front sprocket does the opposite. On the rear, a larger sprocket gives more acceleration and less top speed, while a smaller one increases top speed but reduces acceleration. Chain length must match your sprocket setup: more teeth usually means a longer chain. These adjustments are the most direct way to shift how your vehicle feels and performs.

Sprocket Types (Specifications, Sizes, Uses, Design)

From the above, we can see that Sprockets are an important mechanical part. It is used in both daily life and high-tech fields. Therefore, different types of sprockets are designed to meet different needs. Some examples include double-duty sprockets, hunting-tooth sprockets, segmental rim sprockets, multiple strand sprockets, quick-disconnect sprockets, and idler sprockets. Below we will list the common sprocket types on the market, with their main specifications (key dimensions, hub, mounting, pitch, tooth, keyway & set, material, and surface finish), usual applications, user priorities, and design approaches that address those priorities.

Duplex Sprocket

A duplex sprocket is a toothed wheel designed to engage and drive a double-strand (two-row) roller chain for transmitting mechanical power.

Duplex Sprocket Specifications & Size Chart

Specification	Description / Example
Number of Strands	2 (Duplex)
Chain Standard	ANSI 40-2, ANSI 60-2, BS 10B-2, BS 08B-2, etc.
Pitch (P)	12.7 mm (1/2″), 15.875 mm (5/8″), etc.
Number of Teeth (Z)	10, 12, 18, 24, 30, etc.
Bore Diameter (d)	20 mm, 25 mm, 30 mm, Pilot Bore, etc.
Hub Type	Type A (No hub), Type B (Single hub), Type C (Double hub)
Tooth Width	Double the simplex width (e.g., 10.16 mm for 08B-2)
Tooth Profile	Standard roller chain tooth profile (to ISO, ANSI, BS, DIN)
Material	C45 Steel, Stainless Steel, Cast Iron, etc.
Surface Finish	Plain, Hardened, Black Oxide, Zinc Plated, etc.
Keyway & Set Screw	As per shaft size, optional
Outside Diameter	Depends on pitch and number of teeth (e.g., 132 mm for 20T, 08B-2)

Application:
Used in machinery that requires a double-strand (two-row) chain for higher load transmission, such as industrial conveyors, packaging equipment, and heavy-duty material handling systems.

Client Case Example:
“I need a sprocket for double-strand chains to transmit more power in my machinery.”
How to Design:
Provide two parallel rows of teeth, select strong materials, and maintain accurate alignment for both chains.

Single-Strand Sprocket

A single-strand sprocket is a toothed wheel designed to engage and drive a single-strand (one-row) roller chain in power transmission systems.

Single Strand Sprocket Specifications & Size Chart

Specification	Description / Example
Number of Strands	1 (Single)
Chain Standard	ANSI 40-1, ANSI 60-1, BS 10B-1, BS 08B-1, etc.
Pitch (P)	12.7 mm (1/2″), 15.875 mm (5/8″), etc.
Number of Teeth (Z)	8, 12, 18, 24, 30, etc.
Bore Diameter (d)	20 mm, 25 mm, 30 mm, Pilot Bore, etc.
Hub Type	Type A (No hub), Type B (Single hub), Type C (Double hub)
Tooth Width	Standard width for single-strand chain (e.g., 4.88 mm for 08B-1)
Tooth Profile	Standard roller chain tooth profile (ISO, ANSI, BS, DIN)
Material	C45 Steel, Stainless Steel, Cast Iron, etc.
Surface Finish	Plain, Hardened, Black Oxide, Zinc Plated, etc.
Keyway & Set Screw	As per shaft size, optional
Outside Diameter	Depends on pitch and number of teeth (e.g., 67 mm for 12T, 08B-1)

Application:
Commonly found in motorcycles, bicycles, agricultural machinery, and light industrial equipment where single-strand roller chains are used for general power transmission.

Client Case Example:
“I want a sprocket for a single-strand chain that is reliable and simple to replace.”
How to Design:
Choose durable steel, shape the teeth for single-strand chains, and offer standard sizes for quick installation.

Triplex Sprocket

A triplex sprocket is a toothed wheel specifically designed to engage and drive a triple-strand (three-row) roller chain in high power transmission applications.

Triplex Sprocket Specifications & Size Chart

Specification	Description / Example
Number of Strands	3 (Triplex)
Chain Standard	ANSI 40-3, ANSI 60-3, BS 10B-3, BS 08B-3, etc.
Pitch (P)	12.7 mm (1/2″), 15.875 mm (5/8″), etc.
Number of Teeth (Z)	10, 12, 18, 24, 30, etc.
Bore Diameter (d)	20 mm, 25 mm, 30 mm, Pilot Bore, etc.
Hub Type	Type A (No hub), Type B (Single hub), Type C (Double hub)
Tooth Width	Triple the simplex width (e.g., 15.24 mm for 08B-3)
Tooth Profile	Standard roller chain tooth profile (ISO, ANSI, BS, DIN)
Material	C45 Steel, Stainless Steel, Cast Iron, etc.
Surface Finish	Plain, Hardened, Black Oxide, Zinc Plated, etc.
Keyway & Set Screw	As per shaft size, optional
Outside Diameter	Depends on pitch and number of teeth (e.g., 132 mm for 20T, 08B-3)

Application:
Installed in high-power machinery and equipment that need to move large loads, including heavy-duty conveyor systems, mining equipment, and large industrial gearboxes.

Client Case Example:
“I require a sprocket that works with a triple-strand chain to handle heavy loads.”
How to Design:
Build with wider teeth, reinforce the hub, and machine all three rows to precise tolerances.

Shaft Sprocket

A shaft sprocket is a toothed wheel mounted onto a shaft, designed to transmit rotary motion and power by engaging with a roller chain.

Shaft Sprocket Specifications & Size Chart

Specification	Description / Example
Mounting Type	Fits onto shaft (with keyway and/or set screw)
Chain Standard	ANSI, BS, ISO, DIN (e.g., ANSI 40, BS 08B, etc.)
Pitch (P)	12.7 mm (1/2″), 15.875 mm (5/8″), etc.
Number of Teeth (Z)	10, 12, 18, 24, 30, etc.
Bore Diameter (d)	20 mm, 25 mm, 30 mm, Pilot Bore, Taper Bore, etc.
Hub Type	Type A (No hub), Type B (Single hub), Type C (Double hub)
Tooth Width	According to chain type (single, duplex, triplex, etc.)
Tooth Profile	Matches standard roller chain (ISO, ANSI, BS, DIN)
Material	C45 Steel, Stainless Steel, Cast Iron, etc.
Surface Finish	Plain, Hardened, Black Oxide, Zinc Plated, etc.
Keyway & Set Screw	Provided or optional, according to shaft size
Outside Diameter	Depends on pitch and number of teeth (e.g., 67 mm for 12T, 08B)

Application:
Mounted directly on a shaft in various mechanical systems for transmitting rotary motion, such as in pumps, mixers, and gear reducers.

Client Case Example:
“I need a sprocket that mounts securely onto a shaft and drives the chain without slipping.”
How to Design:
Add keyways and set screws, offer various bore sizes, and select hub shapes for a steady fit.

Steel Split Sprocket

A steel split sprocket is a durable, two-piece sprocket made from steel that can be easily installed or removed from a shaft without having to disassemble the entire drive system.

Steel Split Sprocket Specifications & Size Chart

Specification	Description / Example
Construction	Two-piece (split) design, bolted together
Material	Steel (e.g., C45, 1045, Stainless Steel)
Chain Standard	ANSI, BS, ISO, DIN (e.g., ANSI 40, BS 08B, etc.)
Pitch (P)	12.7 mm (1/2″), 15.875 mm (5/8″), etc.
Number of Teeth (Z)	10, 12, 18, 24, 30, etc.
Bore Diameter (d)	20 mm, 25 mm, 30 mm, Pilot Bore, Taper Bore, etc.
Hub Type	Type B (Single hub), Type C (Double hub), as standard
Tooth Width	According to chain type (single, duplex, triplex, etc.)
Tooth Profile	Matches standard roller chain (ISO, ANSI, BS, DIN)
Surface Finish	Plain, Hardened, Black Oxide, Zinc Plated, etc.
Keyway & Set Screw	Provided or optional, according to shaft size
Outside Diameter	Depends on pitch and number of teeth (e.g., 132 mm for 20T, 08B-1)
Mounting	Split for easy installation/removal, bolted on shaft

Application:
Used in applications where quick installation or replacement is needed without dismantling the shaft or other components, such as in conveyor systems and industrial drives.

Client Case Example:
“I want a sprocket I can install or remove quickly without taking apart the whole shaft setup.”
How to Design:
Use a two-piece split design with bolts, and make sure both halves line up accurately on the shaft.

Industrial Sprocket

An industrial sprocket is a robust, toothed mechanical component used in heavy-duty machinery to transmit rotary motion and power via engagement with a roller chain.

Industrial Sprocket Specifications & Size Chart

Specification	Description / Example
Application	Heavy-duty industrial machinery and equipment
Chain Standard	ANSI, BS, ISO, DIN (e.g., ANSI 80, BS 16B, etc.)
Pitch (P)	12.7 mm (1/2″), 19.05 mm (3/4″), 25.4 mm (1″), etc.
Number of Teeth (Z)	8, 12, 18, 24, 30, etc.
Bore Diameter (d)	25 mm, 40 mm, 50 mm, Pilot Bore, Taper Bore, etc.
Hub Type	Type A (No hub), Type B (Single hub), Type C (Double hub)
Tooth Width	Varies by chain type (simplex, duplex, triplex, etc.)
Tooth Profile	Standard roller chain profile (ISO, ANSI, BS, DIN)
Material	Hardened Steel, Alloy Steel, Stainless Steel, Cast Iron
Surface Finish	Plain, Induction Hardened, Black Oxide, Zinc Plated, etc.
Keyway & Set Screw	Provided or optional, according to shaft size
Outside Diameter	Depends on pitch and number of teeth (e.g., 178 mm for 20T, ANSI 80)
Mounting Options	Keyed bore, Taper bush, QD bush, Set screw, etc.

Application:
Designed for robust and continuous operation in heavy-duty industrial machinery, including manufacturing plants, crushers, and large automated systems.

Client Case Example:
“I need a sprocket that works well in continuous operation for large machines.”
How to Design:
Apply strong, wear-resistant metals, use thick hubs and teeth, and allow for different mounting styles.

Bush Sprocket

A bush sprocket is a toothed wheel designed with a detachable bush or taper locking system, allowing easy mounting and removal from shafts in power transmission systems.

Bush Sprocket Specifications & Size Chart

Specification	Description / Example
Mounting Type	Uses a detachable bush or taper lock bush system
Chain Standard	ANSI, BS, ISO, DIN (e.g., ANSI 40, BS 08B, etc.)
Pitch (P)	12.7 mm (1/2″), 15.875 mm (5/8″), etc.
Number of Teeth (Z)	10, 12, 18, 24, 30, etc.
Bore Diameter (d)	Determined by the bush size (e.g., 1210, 1610, 2517, etc.)
Hub Type	Typically Type B or C (with hub for bush mounting)
Tooth Width	According to chain type (simplex, duplex, triplex, etc.)
Tooth Profile	Standard roller chain profile (ISO, ANSI, BS, DIN)
Material	C45 Steel, Stainless Steel, Cast Iron, etc.
Surface Finish	Plain, Hardened, Black Oxide, Zinc Plated, etc.
Keyway & Set Screw	Incorporated in bush, not in sprocket itself
Outside Diameter	Depends on pitch and number of teeth (e.g., 132 mm for 20T, 08B-1)
Installation	Easy installation/removal by tightening or loosening bush

Application:
Used in power transmission systems where easy mounting and removal from shafts are required, making them suitable for maintenance-prone environments like process plants and bulk material handlers.

Client Case Example:
“I want a sprocket that uses a removable bush so I can switch it out fast.”
How to Design:
Make the hub fit standard bush sizes, allow easy tightening or loosening, and keep the profile smooth.

Multi Strand Sprocket

A multi strand sprocket is a toothed wheel designed to drive two or more parallel roller chains simultaneously for increased power transmission capacity.

Multi Strand Sprocket Specifications & Size Chart

Specification	Description / Example
Number of Strands	2 (Duplex), 3 (Triplex), or more (Quadruplex, etc.)
Chain Standard	ANSI, BS, ISO, DIN (e.g., ANSI 40-2, 08B-3, etc.)
Pitch (P)	12.7 mm (1/2″), 15.875 mm (5/8″), etc.
Number of Teeth (Z)	10, 12, 18, 24, 30, etc.
Bore Diameter (d)	20 mm, 25 mm, 30 mm, Pilot Bore, Taper Bore, etc.
Hub Type	Type A (No hub), Type B (Single hub), Type C (Double hub)
Tooth Width	Multiple of simplex width (e.g., triple for triplex, etc.)
Tooth Profile	Standard roller chain profile (ISO, ANSI, BS, DIN)
Material	C45 Steel, Stainless Steel, Cast Iron, etc.
Surface Finish	Plain, Hardened, Black Oxide, Zinc Plated, etc.
Keyway & Set Screw	Provided or optional, according to shaft size
Outside Diameter	Depends on pitch and number of teeth (e.g., 132 mm for 20T, 08B-3)

Application:
Applied where multiple parallel chains are needed to transmit more power or synchronize different parts of a machine, such as in escalators, large conveyor belts, and synchronized industrial drives.

Client Case Example:
“I need a sprocket that can move several chains at the same time for extra power.”
How to Design:
Include multiple rows of teeth, keep spacing uniform, and use high-strength alloys.

Drive Sprocket

A drive sprocket is the powered, toothed wheel attached to a motor or shaft that transmits rotational motion and power to a chain in a drive system.

Drive Sprocket Specifications & Size Chart

Specification	Description / Example
Function	Transmits power from motor or driving shaft to the chain
Chain Standard	ANSI, BS, ISO, DIN (e.g., ANSI 40, BS 08B, etc.)
Pitch (P)	12.7 mm (1/2″), 15.875 mm (5/8″), etc.
Number of Teeth (Z)	8, 12, 18, 24, 30, etc.
Bore Diameter (d)	20 mm, 25 mm, 30 mm, Pilot Bore, Taper Bore, etc.
Hub Type	Type A (No hub), Type B (Single hub), Type C (Double hub)
Tooth Width	According to chain type (simplex, duplex, triplex, etc.)
Tooth Profile	Standard roller chain profile (ISO, ANSI, BS, DIN)
Material	C45 Steel, Stainless Steel, Cast Iron, etc.
Surface Finish	Plain, Hardened, Black Oxide, Zinc Plated, etc.
Keyway & Set Screw	Provided or optional, according to shaft size
Outside Diameter	Depends on pitch and number of teeth (e.g., 67 mm for 12T, 08B-1)
Mounting	Directly on motor or driving shaft

Application:
Acts as the main driving component attached to a motor or engine shaft, found in motorcycles, bicycles, conveyors, and various motor-driven industrial machinery.

Client Case Example:
“I want a sprocket that connects to my motor and moves the chain efficiently.”
How to Design:
Shape the teeth for smooth chain contact, offer bores that fit motor shafts, and use sturdy materials for long service.

QD Sprocket

A QD sprocket is a toothed wheel designed with a Quick Detachable (QD) bushing system, allowing for fast and easy installation or removal from shafts without extensive disassembly.

QD Sprocket Specifications & Size Chart

Specification	Description / Example
Mounting Type	Quick Detachable (QD) bushing system
Chain Standard	ANSI, BS, ISO, DIN (e.g., ANSI 40, BS 08B, etc.)
Pitch (P)	12.7 mm (1/2″), 15.875 mm (5/8″), etc.
Number of Teeth (Z)	10, 12, 18, 24, 30, etc.
QD Bushing Size	JA, SH, SDS, SK, SF, E, F, etc.
Hub Type	QD hub (flanged for bushing mounting)
Tooth Width	According to chain type (simplex, duplex, triplex, etc.)
Tooth Profile	Standard roller chain profile (ISO, ANSI, BS, DIN)
Material	C45 Steel, Stainless Steel, Cast Iron, etc.
Surface Finish	Plain, Hardened, Black Oxide, Zinc Plated, etc.
Keyway & Set Screw	Incorporated in QD bushing, not in sprocket itself
Outside Diameter	Depends on pitch and number of teeth (e.g., 132 mm for 20T, 08B-1)
Installation	Fast, easy installation/removal via QD bushing

Application:
Used in machinery where fast and easy sprocket changes are needed, such as in assembly lines, packaging machinery, and agricultural equipment.

Client Case Example:
“I need a sprocket that can be put on or taken off quickly with a QD bushing.”
How to Design:
Include a QD hub, machine the bore to match popular bushing systems, and provide clear mounting instructions.

Double Single Sprocket

A double single sprocket is a specially designed sprocket with two sets of single-row teeth spaced apart to independently drive two parallel single-strand roller chains on a common shaft.

Double Single Sprocket Specifications & Size Chart

Specification	Description / Example
Tooth Configuration	Two sets of single-row teeth, spaced apart on one hub
Chain Standard	ANSI, BS, ISO, DIN (e.g., ANSI 40-1, BS 08B-1, etc.)
Pitch (P)	12.7 mm (1/2″), 15.875 mm (5/8″), etc.
Number of Teeth (Z)	10, 12, 18, 24, 30, etc.
Bore Diameter (d)	20 mm, 25 mm, 30 mm, Pilot Bore, Taper Bore, etc.
Hub Type	Type B (Single hub), Type C (Double hub)
Tooth Width	Standard width for single-strand chain; two rows spaced apart
Tooth Profile	Standard roller chain profile (ISO, ANSI, BS, DIN)
Material	C45 Steel, Stainless Steel, Cast Iron, etc.
Surface Finish	Plain, Hardened, Black Oxide, Zinc Plated, etc.
Keyway & Set Screw	Provided or optional, according to shaft size
Outside Diameter	Depends on pitch and number of teeth (e.g., 67 mm for 12T, 08B-1)
Chain Separation	Customizable gap between the two single-strand sprocket rows

Application:
Drives two single-strand chains independently on a common shaft, used in specialized conveyors and machinery that require separate chain paths for different functions.

Client Case Example:
“I require a sprocket that can run two single-strand chains side by side on one shaft.”
How to Design:
Space two rows of teeth apart on the hub and keep each row in line for smooth operation.

Drum Sprocket

A drum sprocket is a large, cylindrical sprocket with teeth around its circumference, commonly used to drive conveyor belts or chains in heavy-duty material handling systems.

Drum Sprocket Specifications & Size Chart

Specification	Description / Example
Shape/Design	Cylindrical drum with teeth machined or welded onto the surface
Application	Conveyor systems, bulk material handling, heavy-duty drives
Chain Standard	ANSI, BS, ISO, DIN (e.g., ANSI 80, BS 16B, etc.)
Pitch (P)	19.05 mm (3/4″), 25.4 mm (1″), etc.
Number of Teeth (Z)	12, 18, 24, 36, 48, etc.
Drum Diameter	200 mm, 300 mm, 400 mm, or as specified
Length/Face Width	400 mm, 600 mm, 1000 mm, or as required
Bore Diameter (d)	40 mm, 50 mm, 75 mm, Pilot Bore, Taper Bore, etc.
Material	Carbon Steel, Alloy Steel, Stainless Steel, etc.
Surface Finish	Plain, Hardened, Painted, Zinc Plated, etc.
Mounting Options	Keyed bore, Taper bush, Welded shaft, Flanged, etc.
Tooth Profile	Matches conveyor or roller chain standard
Weight	Heavier than standard sprockets due to drum construction

Application:
Commonly used to drive conveyor belts or chains in heavy-duty material handling systems, such as bulk material conveyors, mining equipment, and large industrial transporters.

Client Case Example:
“I need a large drum sprocket for my conveyor belt system in bulk handling.”
How to Design:
Use a thick drum body, weld or machine teeth onto the surface, and select materials that resist abrasion.

Idler Sprocket

An idler sprocket is a non-driven sprocket used to guide, support, or maintain tension in a chain system without transmitting power.

Idler Sprocket Specifications & Size Chart

Specification	Description / Example
Function	Guides or tensions the chain without transmitting power
Chain Standard	ANSI, BS, ISO, DIN (e.g., ANSI 40, BS 08B, etc.)
Pitch (P)	12.7 mm (1/2″), 15.875 mm (5/8″), etc.
Number of Teeth (Z)	10, 12, 16, 20, etc.
Bore Type	Plain bore, Ball bearing, Bronze bushing, Needle bearing
Mounting Options	Fixed shaft, Stud, Bearing-mounted, Arm-mounted
Material	C45 Steel, Stainless Steel, Nylon, Cast Iron, etc.
Surface Finish	Plain, Hardened, Black Oxide, Zinc Plated, etc.
Tooth Profile	Standard roller chain profile (ISO, ANSI, BS, DIN)
Outside Diameter	Depends on pitch and number of teeth (e.g., 67 mm for 12T, 08B-1)
Width	According to chain type (simplex, duplex, triplex, etc.)
Adjustment	Some types allow for tensioning adjustment

Application:
Serves to guide or maintain tension in a chain system without transmitting power, used in conveyor systems, chain drives, and tensioning assemblies.

Client Case Example:
“I want a sprocket that helps keep my chain tight and straight but does not drive it.”
How to Design:
Use bearings or bushings for smooth rotation, make the hub lightweight, and offer options for easy mounting.

Taper Lock Sprocket

A taper lock sprocket is a sprocket with a tapered bore designed to be mounted securely onto a shaft using a matching taper lock bush for easy installation and removal.

Taper Lock Sprocket Specifications & Size Chart

Specification	Description / Example
Mounting Type	Taper lock bush system
Chain Standard	ANSI, BS, ISO, DIN (e.g., ANSI 40, BS 08B, etc.)
Pitch (P)	12.7 mm (1/2″), 15.875 mm (5/8″), etc.
Number of Teeth (Z)	10, 12, 18, 24, 30, etc.
Taper Bush Size	1008, 1210, 1610, 2012, 2517, etc.
Hub Type	Flanged hub for taper bush mounting
Tooth Width	According to chain type (simplex, duplex, triplex, etc.)
Tooth Profile	Standard roller chain profile (ISO, ANSI, BS, DIN)
Material	C45 Steel, Stainless Steel, Cast Iron, etc.
Surface Finish	Plain, Hardened, Black Oxide, Zinc Plated, etc.
Keyway & Set Screw	Incorporated in taper bush, not in sprocket itself
Outside Diameter	Depends on pitch and number of teeth (e.g., 132 mm for 20T, 08B-1)
Installation/Removal	Easy and quick using taper lock bush system

Application:
Ideal for applications that demand secure and quick mounting or removal from shafts, including pumps, fans, and industrial machinery where maintenance speed is important.

Client Case Example:
“I need a sprocket that fits onto a shaft using a taper lock bush so I can install or remove it fast.”
How to Design:
Shape the bore for standard taper lock bush sizes, create a flanged hub for strength, and keep the sprocket balanced.

Simplex Sprocket

A simplex sprocket is a toothed wheel designed to engage and drive a single-strand (simplex) roller chain in power transmission systems.

Simplex Sprocket Specifications & Size Chart

Specification	Description / Example
Chain Type	Single-strand (simplex) roller chain
Chain Standard	ANSI, BS, ISO, DIN (e.g., ANSI 40-1, BS 08B-1, etc.)
Pitch (P)	12.7 mm (1/2″), 15.875 mm (5/8″), etc.
Number of Teeth (Z)	8, 10, 12, 18, 24, etc.
Bore Diameter (d)	20 mm, 25 mm, 30 mm, Pilot Bore, Taper Bore, etc.
Hub Type	Type A (No hub), Type B (Single hub), Type C (Double hub)
Tooth Width	Standard width for simplex chain
Tooth Profile	Standard roller chain profile (ISO, ANSI, BS, DIN)
Material	C45 Steel, Stainless Steel, Cast Iron, etc.
Surface Finish	Plain, Hardened, Black Oxide, Zinc Plated, etc.
Keyway & Set Screw	Provided or optional, according to shaft size
Outside Diameter	Depends on pitch and number of teeth (e.g., 67 mm for 12T, 08B-1)

Application:
Used in light to medium-duty machinery for driving a single-strand chain, such as small conveyors, packaging machines, and agricultural implements.

Client Case Example:
“I need a straightforward sprocket to move a single-strand chain in my equipment.”
How to Design:
Follow standard chain dimensions, use reliable metals, and give options for different bore and hub types.

Metric Sprocket Size Chart (Pitch Diameter & Dimensions By ISO/BS Chain)

The metric sprocket dimension chart below combines all the tabular data from the Martin Sprocket metric roller chain sprockets catalog, covering ISO sizes 06B to 32B and their ANSI equivalents. It includes Simplex (single), Duplex (double), and Triplex (triple) sprocket types, with available details for Type A, B, C, and Taper Bushed configurations. The chart lists the number of teeth, pitch diameter, standard and maximum bore, hub diameter, length through bore, weight, and catalog numbers for all available sizes. This allows for quick selection and cross-referencing of metric sprockets for various industrial chain drives, ensuring correct fit for shaft sizes and power requirements. All chain technical data (pitch, roller diameter, width, tensile strength) is also standardized per ISO/BS standards for easy comparison and specification.

ISO Chain	No. Teeth	Pitch Dia. (mm)	Type	Catalog No.	Bore (mm)	Max Bore (mm)	Hub Dia. (mm)	LTB (mm)	Weight (kg)	Bushing	Notes
06B-1	8	24.89	B	06B8	8	9	13	22	0.03	–
06B-1	9	27.85	B	06B9	8	11	16	22	0.04	–
06B-1	10	30.82	B	06B10	8	12	20	22	0.06	–
06B-1	15	45.81	B	06B15	10	20	34	25	0.14	–
06B-1	18	54.85	TB	06BTB18H	–	25.40	22.23	47.63	0.18	1008	H = Hardened teeth
06B-2	12	36.80	D-B	D06B12	10	16	25	25	0.16	–	Duplex
06B-3	12	36.80	T-B	E06B12	12	16	25	35	0.23	–	Triplex
08B-1	12	49.07	B	08B12	10	22	34	28	0.24	–
08B-1	14	57.07	TB	08BTB14H	–	25.40	22.23	46	0.18	1008	H = Hardened teeth
08B-2	12	49.07	D-B	D08B12	12	23	34	35	0.26	–	Duplex
08B-3	12	49.07	T-B	E08B12	14	24	34	50	0.45	–	Triplex
10B-1	12	61.34	B	10B12	12	32	43	25	0.32	–
10B-1	14	71.34	TB	10BTB14H	–	25.40	22.23	49.20	0.27	1008	H = Hardened teeth
10B-2	12	61.34	D-B	D10B12	14	28	43	40	0.57	–	Duplex
10B-3	12	61.34	T-B	E10B12	16	29	43	55	0.82	–	Triplex
12B-1	12	73.60	B	12B12	12	35	53	35	0.67	–
12B-1	14	85.61	TB	12BTB14H	–	31.75	25.40	62.69	0.45	1210	H = Hardened teeth
12B-2	12	73.60	D-B	D12B12	16	36	53	50	1.23	–	Duplex
12B-3	12	73.60	T-B	E12B12	20	36	53	70	1.50	–	Triplex
16B-1	12	98.14	B	16B12	16	47	72	40	1.82	–
16B-1	14	114.15	TB	16BTB14H	–	41.28	38.10	82.55	1.36	1615	H = Hardened teeth
16B-2	12	98.14	D-B	D16B12	20	45	72	70	2.36	–	Duplex
16B-3	12	98.14	T-B	E16B12	25	45	72	100	3.59	–	Triplex
20B-1	12	122.67	B	20B12	25	76	90	48	2.95	–
20B-1	14	142.68	TB	20BTB14H	–	50.80	31.75	90.47	1.63	2012	H = Hardened teeth
20B-2	12	122.67	D-B	D20B12	20	60	90	80	4.31	–	Duplex
20B-3	12	122.67	T-B	E20B12	25	60	90	115	6.21	–	Triplex
24B-1	12	147.21	B	24B12	25	67	102	50	4.77	–
24B-1	14	171.22	TB	24BTB14H	–	63.50	44.45	107.95	3.54	2517	H = Hardened teeth
24B-2	12	147.21	D-B	D24B12	32	67	102	100	8.13	–	Duplex
28B-1	12	171.74	B	28B12	40	84	125	70	6.40	–
28B-1	14	199.80	TB	28BTB14H	–	76.20	50.80	133.35	7.04	3020	H = Hardened teeth
28B-2	12	171.74	D-B	D28B12	40	84	125	120	13.02	–	Duplex
32B-1	12	196.28	B	32B12	40	89	133	80	11.11	–
32B-1	14	228.29	TB	32BTB14H	–	76.20	50.80	133.35	6.87	3020	H = Hardened teeth
32B-2	12	196.28	D-B	D32B12	40	89	133	120	16.32	–	Duplex

Imperial Sprocket Size Chart in Inches (Pitch Diameter & Dimensions By ANSI Chain)

Below is a reference imperial sprocket dimension table showing the outside diameters (in inches) of sprockets for various roller chain sizes and tooth counts. This chart helps users quickly determine the correct sprocket dimensions for different chain pitches (#25, #35, #40, #50, #60, #80, #100, #120), making sprocket selection and system design easier across a wide range of industrial and mechanical applications.

Tooth Count	#25 1/4″ Pitch	#35 3/8″ Pitch	#40 1/2″ Pitch	#50 5/8″ Pitch	#60 3/4″ Pitch	#80 1″ Pitch	#100 1-1/4″ Pitch	#120 1-1/2″ Pitch
9	0.837	1.256	1.674	2.093	2.511	3.348	4.185	5.022
10	0.920	1.379	1.839	2.299	2.759	3.678	4.598	5.517
11	1.002	1.502	2.003	2.504	3.005	4.006	5.008	6.009
12	1.083	1.625	2.166	2.708	3.249	4.332	5.415	6.498
13	1.164	1.746	2.329	2.911	3.493	4.657	5.821	6.986
14	1.245	1.868	2.491	3.113	3.736	4.981	6.226	7.472
15	1.326	1.989	2.652	3.315	3.978	5.304	6.630	7.956
16	1.407	2.110	2.814	3.517	4.220	5.627	7.034	8.441
17	1.487	2.231	2.975	3.718	4.462	5.949	7.436	8.924
18	1.568	2.352	3.136	3.919	4.703	6.271	7.839	9.407
19	1.648	2.472	3.297	4.121	4.945	6.593	8.241	9.890
20	1.729	2.593	3.457	4.321	5.186	6.914	8.643	10.371
21	1.809	2.713	3.618	4.522	5.426	7.235	9.044	10.853
22	1.889	2.833	3.778	4.722	5.666	7.555	9.444	11.333
23	1.969	2.954	3.938	4.923	5.907	7.876	9.845	11.814
24	2.049	3.074	4.098	5.123	6.147	8.196	10.245	12.294
25	2.129	3.194	4.258	5.323	6.387	8.516	10.645	12.774
26	2.209	3.314	4.418	5.523	6.627	8.836	11.045	13.254
27	2.289	3.434	4.578	5.723	6.867	9.156	11.445	13.734
28	2.369	3.553	4.738	5.922	7.106	9.475	11.844	14.213
29	2.449	3.673	4.898	6.122	7.346	9.795	12.244	14.693
30	2.529	3.793	5.057	6.321	7.586	10.114	12.643	15.171
31	2.609	3.913	5.217	6.521	7.826	10.434	13.043	15.651
32	2.688	4.032	5.377	6.721	8.065	10.753	13.441	16.130
33	2.768	4.152	5.537	6.921	8.305	11.073	13.841	16.610
34	2.848	4.272	5.696	7.119	8.543	11.391	14.239	17.087
35	2.928	4.392	5.856	7.319	8.783	11.711	14.639	17.567
36	3.008	4.511	6.015	7.519	9.023	12.030	15.038	18.045
37	3.087	4.631	6.175	7.718	9.262	12.349	15.436	18.524
38	3.167	4.751	6.334	7.918	9.501	12.668	15.835	19.002
39	3.247	4.870	6.494	8.117	9.740	12.987	16.234	19.481
40	3.327	4.990	6.653	8.316	9.980	13.306	16.633	19.959
41	3.406	5.109	6.813	8.516	10.219	13.625	17.031	20.438
42	3.486	5.229	6.972	8.715	10.458	13.944	17.430	20.916
43	3.566	5.349	7.132	8.914	10.697	14.263	17.829	21.395
44	3.646	5.468	7.291	9.114	10.937	14.582	18.228	21.873
45	3.725	5.588	7.451	9.313	11.176	14.901	18.626	22.352
46	3.805	5.707	7.610	9.512	11.414	15.219	19.024	22.829
47	3.885	5.827	7.769	9.711	11.654	15.538	19.423	23.307
48	3.964	5.946	7.929	9.911	11.893	15.857	19.821	23.786
49	4.044	6.066	8.088	10.110	12.132	16.176	20.220	24.264
50	4.124	6.186	8.248	10.309	12.371	16.495	20.619	24.743
140	11.289	16.934	22.578	28.223	33.867	45.156	56.445	67.734

Sprocket Calculation Formula for Design

When it comes to the design and choose of sprockets, you need to pay attention to the number of teeth, the diameter, the pitch, the pitch circle diameter, and the speed calculations. Sprockets are made with a whole number of teeth, and the actual performance is determined by the diameter and the resulting chain speed and mechanical advantage. The bigger the sprocket, the longer the travel is per revolution, and that’s why you do that. Using a smaller sprocket gears it down and gives mechanical advantage. When you calculate the speed, just plug in the values to find the unknown RPM.

By using the following formulas and concepts, you can accurately design and select sprockets for your application, ensuring both performance and durability in your chain-driven system.

Sprocket Teeth Calculation & Formula

Sprockets are purchased by the number of teeth, as you can’t have a half a tooth on a sprocket, so it’s going to be, you know, seven, eight or nine. The number of teeth is one of the first things you need to know.

Gear Ratio Formula:

Gear Ratio = (Number of teeth on driven sprocket) / (Number of teeth on driving sprocket)

For example, if your driver sprocket has 20 teeth and your driven sprocket has 40 teeth, the gear ratio is 2:1.

Sprocket Diameter Calculation & Formula

When that crankshaft goes one revolution, the distance that the chain moves is determined by the diameter of that sprocket. For example, let’s say arbitrarily that’s four inches. So one revolution of a crankshaft, that tooth is moving forward four inches because it is going to move forward by the diameter of that rim.

Pitch Diameter Formula:

Pitch Diameter (D) = P / sin(π / N)

Where:

• P = Chain pitch (distance between chain pins)
• N = Number of sprocket teeth

Sprocket PCD (Pitch Circle Diameter) Calculation & Formula

PCD, or Pitch Circle Diameter, is the diameter of the circle passing through the centers of all the sprocket’s teeth.

PCD Formula:

PCD = P / sin(180° / N)

Note: If using degrees, convert π radians to 180°.

Sprocket Speed Calculation & Formula

The RPM (revolutions per minute) of chain sprockets on a machine varies depending on several factors including the motor’s RPM or driver’s sprocket RPM, the gearing ratios and the size of the sprockets. To calculate the RPM of the driven sprocket, you need to know the number of teeth on both sprockets and the RPM of the driver sprocket.

Speed (RPM) Formula:

N₂ = (N₁ × T₁) / T₂

Where:

• N₁ = RPM of driving sprocket
• T₁ = Number of teeth on driving sprocket
• T₂ = Number of teeth on driven sprocket
• N₂ = RPM of driven sprocket

Example:
The driver’s chain sprocket has 40 teeth and RPM is 900, where the driven sprocket has 20 teeth.

N₂ = (900 × 40) / 20 = 1,800 RPM

So the driven sprocket will rotate at 1,800 RPM.

Sprocket Pitch Calculation & Formula

Pitch is the distance between the centers of two consecutive chain pins, and it must match the chain being used.

Pitch Formula:

Pitch (P) = Circumference / Number of teeth

Or, simply:
P is defined by the chain standard (e.g., ½”, 5/8″, etc.)

The pitch determines both the chain and sprocket compatibility.