21 Teeth Sprockets | McMaster-Carr

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	Roller Chain Trade Size Roller Chain Trade Size

	System of Measurement System of Measurement

Inch

Metric

	For Shaft Diameter For Shaft Diameter

	Bore Type Bore Type

	Pitch Pitch

	OD OD

	Material Material

	Overall Width Overall Width

	For Shaft Type For Shaft Type

Round

Keyed

	For Roller Chain Strand Type For Roller Chain Strand Type


Single	Double

	Hub Diameter Hub Diameter

	ID ID

	Sprocket Type Sprocket Type

Standard

Idler

	Roller Chain Standard Roller Chain Standard

ANSI

ISO

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

RoHS Compliant with
Exemptions

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	For Maximum Shaft Diameter For Maximum Shaft Diameter

	Shaft Mount Type Shaft Mount Type

Set Screw

Press Fit

	Keyway Width Keyway Width

	Bearing Type Bearing Type


Ball	Sleeve

	For Bushing Type For Bushing Type

146 Products

About Roller Chain and Sprockets

Sprockets for ANSI Roller Chain

Mount these sprockets onto your shaft and secure with a set screw—no machining necessary.

Machinable-Bore Sprockets for ANSI Roller Chain

For a custom fit on your shaft, these sprockets can be machined to your exact specifications.

Wear-Resistant Sprockets for ANSI Roller Chain

Hardened teeth give these steel sprockets increased wear resistance for a long service life.

Corrosion-Resistant Sprockets for ANSI Roller Chain

Mount these sprockets onto your shaft and secure with a set screw—no machining necessary.

Flat Sprockets for ANSI Roller Chain

Also known as A-plate sprockets, these have a slim profile that fits in narrow spaces.

Sprockets for Metric Roller Chain

Designed to meet ISO 606 and DIN 8187 international dimensional standards, these sprockets are for use with compatible ISO and DIN roller chain.

Flat Sprockets for Metric Roller Chain

With metric teeth and slim profile, these sprockets allow your ISO roller chain to reach narrow spaces. They're commonly referred to as A-plate sprockets.

Sprockets for Double-Strand Metric Roller Chain

The double row of teeth on these sprockets are designed to fit into metric ISO double-strand roller chain.

Wide-Hub Idler Sprockets for ANSI Roller Chain

A wide hub provides these sprockets with stability under heavy loads.

Idler Sprockets for Metric Roller Chain

Keep constant tension on your drive with these sprockets that press against your metric ISO roller chain to take up slack and reduce wear and vibration.

Quick-Disconnect (QD) Bushing-Bore
Sprockets for ANSI Roller Chain

Use these sprockets with compatible QD bushings.

Taper-Lock Bushing-Bore
Sprockets for ANSI Roller Chain

Get the same sizing versatility as quick-disconnect sprockets while using less space.

Split-Tapered Bushing-Bore
Sprockets for ANSI Roller Chain

Since these sprockets grip bushings more tightly than taper-lock sprockets, they’re often used in high-torque applications.

Taper-Lock Bushing-Bore
Sprockets for Metric Roller Chain

While their teeth fit into metric ISO roller chain, these sprockets use taper-lock bushings to grip shafts.

Timing Belts and Pulleys

XL Series Corrosion-Resistant Timing Belt Pulleys

Pulleys are anodized aluminum, which is more corrosion resistant than steel.

XL Series Lightweight Timing Belt Pulleys

Acetal and aluminum construction makes these pulleys useful in for weight-sensitive applications.

XL Series Timing Belt Pulleys

Pulleys are XL series (extra light) and have trapezoidal teeth.

H Series Timing Belt Pulleys

Pulleys are H series (heavy) and have trapezoidal teeth.

MXL Series Lightweight Timing Belt Pulleys

Made from polycarbonate, these pulleys are useful in applications with weight constraints.

MXL Series Corrosion-Resistant Timing Belt Pulleys

Anodized aluminum has good corrosion resistance.

Metal Gears and Gear Racks

Metal Gears and Gear Racks—14 1/2° Pressure Angle

A former industry standard, 14½° pressure angle gears are often found on older machinery.

Metal Gears and Gear Racks—20° Pressure Angle

The current industry standard, these 20° pressure angle gears have thicker, stronger teeth than 14½° pressure angle gears. They're also known as spur gears.

Metal Miter Gears

With straight, conically shaped teeth and a 1:1 speed ratio, miter gears connect two shafts at a right angle without changing shaft speed or torque. They're more efficient than spiral miter gears because they create less friction.

Sprockets for Conveyor Chain Belts

Sprockets transmit power to drive belting.

About Roller Chain and Sprockets

Sprockets

Sprockets for ANSI Roller Chain

Machinable-Bore Sprockets for ANSI Roller Chain

Wear-Resistant Sprockets for ANSI Roller Chain

Corrosion-Resistant Sprockets for ANSI Roller Chain

Flat Sprockets for ANSI Roller Chain

Sprockets for Metric Roller Chain

Flat Sprockets for Metric Roller Chain

Sprockets for Double-Strand Metric Roller Chain

Wide-Hub Idler Sprockets for ANSI Roller Chain

Idler Sprockets for Metric Roller Chain

Quick-Disconnect (QD) Bushing-BoreSprockets for ANSI Roller Chain

Taper-Lock Bushing-BoreSprockets for ANSI Roller Chain

Split-Tapered Bushing-BoreSprockets for ANSI Roller Chain

Taper-Lock Bushing-BoreSprockets for Metric Roller Chain

Timing Belts and Pulleys

XL Series Corrosion-Resistant Timing Belt Pulleys

XL Series Lightweight Timing Belt Pulleys

XL Series Timing Belt Pulleys

H Series Timing Belt Pulleys

MXL Series Lightweight Timing Belt Pulleys

MXL Series Corrosion-Resistant Timing Belt Pulleys

Metal Gears and Gear Racks

Metal Gears and Gear Racks—14 1/2° Pressure Angle

Metal Gears and Gear Racks—20° Pressure Angle

Metal Miter Gears

Sprockets for Conveyor Chain Belts

Sprockets for Conveyor Chain Belts

Quick-Disconnect (QD) Bushing-Bore
Sprockets for ANSI Roller Chain

Taper-Lock Bushing-Bore
Sprockets for ANSI Roller Chain

Split-Tapered Bushing-Bore
Sprockets for ANSI Roller Chain

Taper-Lock Bushing-Bore
Sprockets for Metric Roller Chain