Tensioners | McMaster-Carr

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

REACH Compliant

	Tension Force Tension Force

	Load Load

	Turnbuckle Type Turnbuckle Type

Threaded Stud to Stud

Clevis to Eye

Unthreaded Stub to Stub

Hook to Clevis

	For Belt Trade Size For Belt Trade Size

	For Maximum Belt Width For Maximum Belt Width

	Pulley Type Pulley Type


Idler	Standard

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8,220 Products

Tensioners for Chain and Belt Drives

Spring-Loaded Adjustable-Arm
Roller Chain and Belt Tensioners

Apply continuous tension and automatically take up slack at any point in a 180° arc.

Heavy Duty Belt and Roller Chain Tensioners

Maintain correct drive tension to ensure smooth operation for maximum power and a long service life.

Adjustable-Arm Roller Chain and Belt Tensioners

Position the adjustment arm to control tension in a 360° arc.

Adjustable-Screw Roller Chain and Belt Tensioners

Precisely apply tension in a straight line by moving the adjustment screw.

Channel-Guided Roller Chain Tensioners

These tensioners range in height from 5 15/32" to 7 25/32".

Ultra-Low-Profile Channel-Guided
Roller Chain Tensioners

Able to fit in tight spots, these tensioners are less than 3" tall.

Low-Profile Channel-Guided Roller Chain Tensioners

At less than 4" in height, these tensioners are good for use on low-clearance drives.

Floating Roller Chain Tensioners

Mount these tensioners directly onto your chain drive. They have adjustable straps that take up slack and apply constant tension.

Roller Chain Tensioning Rings

Install these rings between strands of chain to absorb slack without the need for realignment, lubrication, or tools—good for use in confined spaces where maintenance may be difficult.

Flat-Belt Pulleys

Flat-Belt Idler Pulleys

These pulleys spin freely on built-in bearings to maintain tension for reduced wear and vibration.

Flat-Belt Pulleys

Also known as paper-plant pulleys, these are made of a paper-fiber composite that minimizes belt slippage and wear.

Timing Belts and Pulleys

Timing Belt Idler Pulleys

Add these free-spinning pulleys to your timing belt setup to minimize vibration and keep belts from wearing out.

L Series Quick-Disconnect Timing Belt Pulleys

Carry heavy loads without slippage—pulleys mount with a bushing for a more secure grip on the shaft than set screws.

L Series Timing Belt Pulleys

These L series (light) pulleys and have trapezoidal teeth.

L Series Corrosion-Resistant Timing Belt Pulleys

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

XL Series Corrosion-Resistant Timing Belt Pulleys

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

XL Series Timing Belt Pulleys

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

XL Series Lightweight Timing Belt Pulleys

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

MXL Series Corrosion-Resistant Timing Belt Pulleys

Anodized aluminum has good corrosion resistance.

H Series Quick-Disconnect Timing Belt Pulleys

Move heavy loads without slippage—pulleys mount with a bushing for a more secure grip on the shaft than set screws.

MXL Series Lightweight Timing Belt Pulleys

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

H Series Timing Belt Pulleys

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

AT Series Timing Belt Pulleys

Made of aluminum, these pulleys have good corrosion resistance.

T Series Timing Belt Pulleys

Made of aluminum, these pulleys have good corrosion resistance.

High-Strength Timing Belts and Pulleys

High-Strength HTD Timing Belt Idler Pulleys

Keep high torque drive (HTD) timing belt systems running tightly with these idler pulleys. Made with built-in, free-spinning ball bearings, they're installed on shafts or belt tensioners to remove slack from timing belts.

High-Strength Corrosion-Resistant
HTD Timing Belt Pulleys

Move belts forward and backward or stop and start them in precise positions, especially in areas where rust is a concern.

High-Strength HTD Timing Belt Pulleys

These HTD (high torque drive) pulleys have a curved tooth shape that provides higher strength than trapezoidal teeth.

High-Strength GT Timing Belt Pulleys

For higher speed or higher torque applications, these GT series timing belt pulleys provide a more precise fit than HTD pulleys. Use them where accuracy is critical, such as in storage and retrieval systems or in robotics.

Ultra-High-Strength Poly Chain Timing Belt Pulleys

Curved teeth with a high pitch provide superior load distribution and reduce wear. They mount with a bushing for a more secure grip on the shaft than set screws.

High-Strength Ultra-Quiet Timing Belt Pulleys

Teeth are curved and set in an offset pattern for high strength with 25% less operating noise than pulleys and belts with trapezoidal teeth.

V-Belt Pulleys

Choose from nylon, UHMW, and zinc.

Heavy Duty V-Belt Pulleys

These pulleys are cast iron.

Constant-Tension V-Belt Pulleys

A built-in spring maintains tension on your belt.

Adjustable-Pitch V-Belt Pulleys

Increase efficiency, vary speed, and extend the life of your drive by changing the pitch on these pulleys.

Adjustable-Speed V-Belt Pulleys

Also known as step-cone pulleys, these have multiple groove sizes so you can quickly change rotation speed by moving your belt to a different groove.

V-Belt Idler Pulleys

These pulleys spin freely on built-in ball bearings to maintain tension for reduced wear and vibration.

Quick-Disconnect (QD) Bushing-Bore V-Belt Pulleys

Use these pulleys with compatible quick-disconnect bushings.

Split-Tapered Bushing-Bore V-Belt Pulleys

These pulleys have the same sizing versatility as quick-disconnect pulleys, but they create a tighter grip on bushings for use in high-torque applications.

Taper-Lock Bushing-Bore V-Belt Pulleys

Mount these pulleys with a taper-lock bushing for a tight, wobble-free hold on your shaft.

Round-Belt Pulleys

Round-Belt Idler Pulleys

These pulleys spin freely on built-in bearings to maintain tension for reduced wear and vibration.

Round-Belt Pulleys

Mount these pulleys directly onto a shaft to transmit rotary motion and torque.

Roller Chain Holders

Cable-Style Roller Chain Holders

Hooks at each end of the cable insert into the rollers beyond the links you want to change. Tighten the hooks with the included box wrench to add or remove a link. Maximum jaw capacity is 42".

Jaw-Style Roller Chain Holders

Hook into your roller chain and use the handle to tighten the jaw until the chain ends are close enough to add or remove a link. Choose from holders with maximum jaw capacity from 1 3/4” to 5”.

Material Handling

Eye-to-Eye Turnbuckles—Not for Lifting

Closed-Body Eye-to-Eye Turnbuckles—Not for Lifting

The closed body protects threads from damage and debris and has a slim profile to fit in tight spaces.

Eye-to-Eye Turnbuckles—For Lifting

Clevis-to-Clevis Turnbuckles—For Lifting

Clevis-to-Clevis Turnbuckles—Not for Lifting

Closed-Body Clevis-to-Clevis
Turnbuckles—Not for Lifting

The closed body protects threads from damage and debris and has a slim profile to fit in tight spaces.

Hook-to-Hook Turnbuckles—Not for Lifting

Closed-Body Hook-to-Hook Turnbuckles—Not for Lifting

The closed body protects threads from damage and debris and has a slim profile to fit in tight spaces.

Hook-to-Eye Turnbuckles—Not for Lifting

Closed-Body Hook-to-Eye Turnbuckles—Not for Lifting

The closed body protects threads from damage and debris and has a slim profile to fit in tight spaces.

Threaded Stud-to-Stud Turnbuckles—Not for Lifting

Closed-Body Clevis-to-Eye Turnbuckles—Not for Lifting

The closed body protects threads from damage and debris and has a slim profile to fit in tight spaces.

Clevis-to-Eye Turnbuckles—Not for Lifting

Unthreaded Stub-to-Stub Turnbuckles—Not for Lifting

Weld these stubs to parts or use them to push objects apart instead of pulling them together.

Hook-to-Clevis Turnbuckles—Not for Lifting

Turnbuckle Bodies—Not for Lifting

Turnbuckle Bodies—For Lifting

Closed Turnbuckle Bodies—Not for Lifting

The closed body protects threads from damage and debris and has a slim profile to fit in tight spaces.

Clevis End Fittings for Turnbuckles—Not for Lifting

Clevis End Fittings for Turnbuckles—For Lifting

Eye End Fittings for Turnbuckles—Not for Lifting

Eye End Fittings for Turnbuckles—For Lifting

Threaded Stud End Fittings for
Turnbuckles—Not for Lifting

Hook End Fittings for Turnbuckles—Not for Lifting

Unthreaded Stub End Fittings
for Turnbuckles—Not for Lifting

Weld these stubs to parts or use them to push objects apart instead of pulling them together.

Conveyor Belt Tensioners

A tensioner extends or retracts the conveyor pulley to adjust the tension on the conveyor belt.

Bearings for Conveyor Belt Tensioners

Use on a conveyor pulley with a conveyor belt tensioner to adjust the tension on a conveyor belt.

Enclosed Conveyor Belt Tensioners

These tensioners have a totally enclosed adjusting screw to prevent debris buildup and thread damage.

Tensioners for Metal Strapping

Use these tensioners to draw metal strapping tight around packages.

High-Tension Tensioners for Metal Strapping

These tensioners apply maximum tension to pull strapping more tightly around packages than standard tensioners for metal strapping.

Combination Tensioner/Sealers for Metal Strapping

These tools do double duty, pulling metal strapping tight and then sealing it, without the use of a separate seal.

Sealers for Metal Strapping

Also known as crimpers, sealers secure seals onto metal strapping.

High-Tension Tensioners for Plastic Strapping

These tensioners apply extreme tension on plastic strapping to hold it tight around packages. They hold the bottom strap and tension the top strap by winding it around a take-up wheel.

Tensioners for Plastic Strapping

Use these tensioners with buckles in low-tension applications to draw plastic strapping tight around packages.

Electric Combination
Tensioner/Sealers for Plastic Strapping

Capable of securing 15 straps per minute, these mobile tensioners/sealers save you time and energy.

Manual Combination Tensioner/Crimp-Tight
Sealers for Plastic Strapping

Crimp on a seal with these tools to hold plastic strapping tight. They have different levers for tensioning and sealing.

Battery-Powered Combination
Tensioner/Friction-Weld Sealers for Plastic Strapping

These tools use heat to secure strapping without crimping on a seal.

Sealers for Plastic Strapping

Also known as crimpers, sealers secure seals onto plastic strapping to hold it tight.

Quick-Tight Lever Load Binders

Pull the lever on these binders to quickly take up slack.

High-Tension Ratchet Load Binders

The ratcheting handle on these load binders tightens incrementally for maximum tension and releases loads without kickback.

Tamper-Resistant Ratchet Load Binders

Secure heavy cargo, then remove and store the handle to prevent unwanted adjustments.

Air-Powered Cable Tie Tensioning Tools

Handle high production jobs with minimal effort. Multiple tension settings ensure a precise fit around the bundle.

Light Duty Cable Tie Tensioning Tools

Tighten cable ties and trim the excess with these tools.

Precise-Adjustment Cable Tie Tensioning Tools

Multiple tension settings ensure a precise fit around the bundle.

Mounting-Plate-End Compression-Grip
Wire Rope End Fittings—Not for Lifting

Compress the thin shank wall with a hand tool to attach these light duty mounting-plate-end fittings. They are also known as hand swage fittings.

Clevis-End Plug-Lock Wire
Rope End Fittings—For Lifting

Install these clevis-end plug-lock fittings on the end of wire rope for a strong hold and finished appearance.

Mounting-Plate-End Sleeve-Grip Wire
Rope End Fittings—Not for Lifting

Add a mounting-plate to wire rope without having to fray the rope or use a compression tool.

Springs

Extension Springs with Hook Ends

Use these steel springs in noncorrosive environments.

Corrosion-Resistant Extension Springs with Hook Ends

Made of stainless steel, these springs are more corrosion resistant than steel extension springs.

Extension Springs with Loop Ends

Use these steel springs in noncorrosive environments.

Corrosion-Resistant Extension Springs with Loop Ends

Made of stainless steel, these springs are more corrosion resistant than steel extension springs.

Mil. Spec. Extension Springs with Loop Ends

These steel springs meet MS 24586 and come with a traceable lot number and material test report.

Extension Springs with Special Ends

For specialty applications and connections, these springs have unique end types.

Corrosion-Resistant Swiveling
Extension Spring Stud Anchors

These stainless steel anchor studs offer excellent corrosion resistance.

Swiveling Extension Spring Stud Anchors

A black-oxide finish provides mild corrosion resistance.

Extension Spring Stud Anchors

A black-oxide finish provides mild corrosion resistance.

Corrosion-Resistant Extension Spring Stud Anchors

These stainless steel anchor studs offer excellent corrosion resistance.

Overload-Prevention Extension Springs

These zinc-plated steel springs have mild corrosion resistance.

Corrosion-Resistant
Overload-Prevention Extension Springs

Made of stainless steel, these springs are more corrosion resistant than steel extension springs.

Extra-Stretch Extension Springs

These fabric-covered rubber springs stretch to up to three times their original length—much farther than traditional extension springs, tie downs, and shock cords.

Extension Spring Stock

Use these steel springs in noncorrosive environments.

Corrosion-Resistant Extension Spring Stock

Made of stainless steel, these springs are more corrosion resistant than steel extension springs.

Made-to-Order Extension Springs

Whatever the size, we'll get the spring you need.

Constant-Force Springs

No matter how far you extend them, these springs pull back with the same amount of force.

Clip-On Constant-Force Springs

Clip the end onto a flat surface to install—no fasteners needed. Once installed, these springs pull back with the same amount of force no matter how far you extend them.

Variable-Force Springs

Unlike constant-force springs, the farther you pull these, the harder they are to pull. Use them for applications where the load becomes lighter as the spring contracts, such as in automated dispensing machines.

Garter Springs

With ends that are connected to form a circle, these garter springs exert strong radial (towards the center) forces from all directions to maintain pressure on shafts or in seals.

Rotor Springs

Wind these springs to store power, then release them to create rotary motion—similar to winding a wristwatch. Also known as clock springs and power springs.

Torsion Springs

Use these steel springs in noncorrosive environments.

Corrosion-Resistant Torsion Springs

Made of stainless steel, these springs are more corrosion resistant than steel springs.

Made-to-Order Torsion Springs

Whatever the size, we'll get the spring you need.

Low-Profile Band Clamps for Firm Hose

Ratchet-Handle Installation Tools for Build-Your-Own
Low-Profile Band Clamps for Firm Hose

Vise-Mount Installation Tools for Build-Your-Own
Low-Profile Band Clamps for Firm Hose

Wing-Handle Installation Tools for Build-Your-Own
Low-Profile Band Clamps for Firm Hose

Install low-profile band clamps, or fit a cutting adapter over the tool to install Extra-Strength Low-Profile Band Clamps.

Light Duty Installation Tools for
Low-Profile Band Clamps for Firm Hose

Use to tighten low-profile band clamps, then break off the excess banding.

Heavy Duty Installation Tools for
Low-Profile Band Clamps for Firm Hose

With the most leverage of any of our installation tools, this tool has a ball handle that makes it easier to ratchet.

Medium Duty Installation Tools for
Low-Profile Band Clamps for Firm Hose

This tool is longer than the light duty tool for increased leverage.

Wing-Handle Installation Tools for Extra-Strength
Low-Profile Band Clamps for Firm Hose

Band Saw Blade Tension Gauges

Ensure proper blade tension.

Force Gauges

Tension Force Gauges with Scale

Measure tension force as well as weight.

Large Dial Tension Force Gauges with Scale

The large dial makes these gauges easy to read. They measure tension force as well as weight.

Tension Force Gauges for Wire and Filament

Measure the tension of wire and filament without pausing your operation.

Compact Tension Force Gauges

Press the side of the gauge tip against an object to record the amount of tension required to move it.

Tension and Compression
Force Gauges for Tight Spaces

Housing is brass.

Economy Tension and Compression
Force Gauges for Tight Spaces

Housing is plastic.

Compact Tension and Compression Force Gauges

Compact Tension and Compression Force
Gauges with Certificate of Calibration

These gauges come with a calibration certificate traceable to NIST that states they've passed a test for accuracy.

Tension and Compression Force Gauges

Tension and Compression Digital Force
Gauges with Data Logging Software

Use the included Windows-compatible software to upload measurement data.

Remote-Reading Tension Force Gauges

Safely view your tension force measurements on a handheld receiver up to 450 ft. away when moving bulk material with cranes and hoists.

Large-Capacity Digital Tension
Force Gauges with Scale

Measure tension force as well as weight. Also known as dynamometers.

Tensioners for Chain and Belt Drives

Spring-Loaded Adjustable-ArmRoller Chain and Belt Tensioners

Heavy Duty Belt and Roller Chain Tensioners

Adjustable-Arm Roller Chain and Belt Tensioners

Adjustable-Screw Roller Chain and Belt Tensioners

Channel-Guided Roller Chain Tensioners

Ultra-Low-Profile Channel-GuidedRoller Chain Tensioners

Low-Profile Channel-Guided Roller Chain Tensioners

Floating Roller Chain Tensioners

Roller Chain Tensioning Rings

Flat-Belt Pulleys

Flat-Belt Idler Pulleys

Flat-Belt Pulleys

Timing Belts and Pulleys

Timing Belt Idler Pulleys

L Series Quick-Disconnect Timing Belt Pulleys

L Series Timing Belt Pulleys

L Series Corrosion-Resistant Timing Belt Pulleys

XL Series Corrosion-Resistant Timing Belt Pulleys

XL Series Timing Belt Pulleys

XL Series Lightweight Timing Belt Pulleys

MXL Series Corrosion-Resistant Timing Belt Pulleys

H Series Quick-Disconnect Timing Belt Pulleys

MXL Series Lightweight Timing Belt Pulleys

H Series Timing Belt Pulleys

AT Series Timing Belt Pulleys

T Series Timing Belt Pulleys

High-Strength Timing Belts and Pulleys

High-Strength HTD Timing Belt Idler Pulleys

High-Strength Corrosion-ResistantHTD Timing Belt Pulleys

High-Strength HTD Timing Belt Pulleys

High-Strength GT Timing Belt Pulleys

Ultra-High-Strength Poly Chain Timing Belt Pulleys

High-Strength Ultra-Quiet Timing Belt Pulleys

V-Belt Pulleys

V-Belt Pulleys

Heavy Duty V-Belt Pulleys

Constant-Tension V-Belt Pulleys

Adjustable-Pitch V-Belt Pulleys

Adjustable-Speed V-Belt Pulleys

V-Belt Idler Pulleys

Quick-Disconnect (QD) Bushing-Bore V-Belt Pulleys

Split-Tapered Bushing-Bore V-Belt Pulleys

Taper-Lock Bushing-Bore V-Belt Pulleys

Round-Belt Pulleys

Round-Belt Idler Pulleys

Round-Belt Pulleys

Roller Chain Holders

Cable-Style Roller Chain Holders

Jaw-Style Roller Chain Holders

Material Handling

Eye-to-Eye Turnbuckles—Not for Lifting

Closed-Body Eye-to-Eye Turnbuckles—Not for Lifting

Eye-to-Eye Turnbuckles—For Lifting

Clevis-to-Clevis Turnbuckles—For Lifting

Clevis-to-Clevis Turnbuckles—Not for Lifting

Closed-Body Clevis-to-ClevisTurnbuckles—Not for Lifting

Hook-to-Hook Turnbuckles—Not for Lifting

Closed-Body Hook-to-Hook Turnbuckles—Not for Lifting

Hook-to-Eye Turnbuckles—Not for Lifting

Closed-Body Hook-to-Eye Turnbuckles—Not for Lifting

Threaded Stud-to-Stud Turnbuckles—Not for Lifting

Closed-Body Clevis-to-Eye Turnbuckles—Not for Lifting

Clevis-to-Eye Turnbuckles—Not for Lifting

Unthreaded Stub-to-Stub Turnbuckles—Not for Lifting

Hook-to-Clevis Turnbuckles—Not for Lifting

Turnbuckle Bodies—Not for Lifting

Turnbuckle Bodies—For Lifting

Closed Turnbuckle Bodies—Not for Lifting

Clevis End Fittings for Turnbuckles—Not for Lifting

Clevis End Fittings for Turnbuckles—For Lifting

Eye End Fittings for Turnbuckles—Not for Lifting

Eye End Fittings for Turnbuckles—For Lifting

Threaded Stud End Fittings forTurnbuckles—Not for Lifting

Hook End Fittings for Turnbuckles—Not for Lifting

Unthreaded Stub End Fittingsfor Turnbuckles—Not for Lifting

Conveyor Belt Tensioners

Bearings for Conveyor Belt Tensioners

Enclosed Conveyor Belt Tensioners

Tensioners for Metal Strapping

Spring-Loaded Adjustable-Arm
Roller Chain and Belt Tensioners

Ultra-Low-Profile Channel-Guided
Roller Chain Tensioners

High-Strength Corrosion-Resistant
HTD Timing Belt Pulleys

Closed-Body Clevis-to-Clevis
Turnbuckles—Not for Lifting

Threaded Stud End Fittings for
Turnbuckles—Not for Lifting

Unthreaded Stub End Fittings
for Turnbuckles—Not for Lifting

Electric Combination
Tensioner/Sealers for Plastic Strapping

Manual Combination Tensioner/Crimp-Tight
Sealers for Plastic Strapping

Battery-Powered Combination
Tensioner/Friction-Weld Sealers for Plastic Strapping

Mounting-Plate-End Compression-Grip
Wire Rope End Fittings—Not for Lifting

Clevis-End Plug-Lock Wire
Rope End Fittings—For Lifting

Mounting-Plate-End Sleeve-Grip Wire
Rope End Fittings—Not for Lifting

Corrosion-Resistant Swiveling
Extension Spring Stud Anchors

Corrosion-Resistant
Overload-Prevention Extension Springs

Ratchet-Handle Installation Tools for Build-Your-Own
Low-Profile Band Clamps for Firm Hose

Vise-Mount Installation Tools for Build-Your-Own
Low-Profile Band Clamps for Firm Hose

Wing-Handle Installation Tools for Build-Your-Own
Low-Profile Band Clamps for Firm Hose

Light Duty Installation Tools for
Low-Profile Band Clamps for Firm Hose

Heavy Duty Installation Tools for
Low-Profile Band Clamps for Firm Hose

Medium Duty Installation Tools for
Low-Profile Band Clamps for Firm Hose

Wing-Handle Installation Tools for Extra-Strength
Low-Profile Band Clamps for Firm Hose

Tension and Compression
Force Gauges for Tight Spaces

Economy Tension and Compression
Force Gauges for Tight Spaces

Compact Tension and Compression Force
Gauges with Certificate of Calibration

Tension and Compression Digital Force
Gauges with Data Logging Software

Large-Capacity Digital Tension
Force Gauges with Scale