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JAW COUPLING

Jaw Couplings for Smooth Power Transmission

AniGears AJ Series Jaw Couplings are torsionally flexible, fail-safe couplings designed to transmit torque through interlocking precision-machined jaws and a resilient elastomer element (spider).

They provide reliable power transmission while absorbing shock loads and damping vibration.

The design ensures continuous drive even in case of elastomer failure (metal-to-metal contact between jaws), making them ideal for industrial applications where reliability and simplicity are essential.

AniGears Jaw Couplings are compact, easy to install, and require no lubrication, offering long life with minimal maintenance.

They are suitable for both horizontal and vertical installations, and are widely used across mechanical drives where moderate torque, flexibility, and vibration damping are required.

The AJ Series is available in four variants to suit diverse mounting and maintenance requirements.

AniGears AJ Series jaw couplings are torsionally flexible, fail-safe couplings that send torque between precision-machined jaws and a flimsy elastomer element called a spider. The small coupling provides reliable power transmission while transmitting moderate amounts of shock and vibration and providing limited shaft movement.

AJ Series lubrication-free units are mounted horizontally or vertically and are available in four different configurations for mounting, access, and maintenance requirements.

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Selection Procedure

Easy Selection Steps

Follow our simple step-by-step process to choose the right product for your application, ensuring optimal performance and reliability.

Determine Absorbed Power (kW)

Select Service Factor (SF)

Compute Design Power

Determine Coupling Rating at Operating Speed

Select Coupling Size

Verify Bore and Misalignment

Finalize Coupling Type

Dimension Of Jaw Couplings

Detailed Measurements for Jaw Couplings

Accurate dimensions provided to ensure proper selection, installation, and reliable performance of your Jaw couplings.

View Table

Coupling Size	Rating H.P/RPM	Clear Diameter OD (mm)	Boss Length L1 (mm)	Boss Length L2 (mm)	Removal Space RS (mm)	Gap G (mm)	Cover Bore CB (mm)	Safe Speed R.P.M	Stock Rough Bore (mm)	Max. Bore (mm)	Approx Weight Kgs
AJ/AJW/AJS	95	21.1	0.22	31.7	0.33	-	28	65	54	25	49	2	19	90, 100	63
AJ/AJW/AJS	100	46.4	0.49	69.6	0.73	-	35	78	65	35	57	2	27	140	88
AJ/AJW/AJS	110	89	0.93	133.5	1.4	-	42	96	85	43	76	3	35	90, 100, 140, 180	108
AJ/AJW/AJS	150	141	1.5	211.5	2.2	-	48	111	96	45	80	3	35	90, 100, 140, 180	115
AJ/AJW/AJS	190	190	2	285	3	-	60	129	115	54	102	3	45	90, 100, 140, 180	133
AJ/AJW/AJS	225	265	2.8	397.5	4.2	-	65	142	127	64	111	3	45	90, 100, 140, 180	153
AJ/AJW/AJS	226	327	3.4	490.5	5.1	25	70	153	137	70	119	3	51	-	178
AJ/AJW	276	532	5.6	798	8.4	25	75	173	157	80	127	3	60	-	200
AJ/AJW	280	782	8.2	1173	12.3	30	80	208	192	80	140	3	70	-	200
AJ/AJW	295	1279	13.4	1918.5	20.1	30	95	253	237	95	162	3	80	-	238

Installation Steps

Easy Installation Steps

Clean all components thoroughly before assembly.
Mount hubs on shafts ensuring full key engagement.
Align shafts and maintain equal gap between hub jaws.
Insert the elastomer spider ensuring full seating between jaws.
For AJW / AJL / AJS types, ensure clamping rings or fasteners are securely tightened.
Check alignment after installation.

Maintenance

Easy Maintenance

Periodically inspect elastomer for wear, cracks, or hardening.
Replace if swelling, tearing, or excessive wear is observed.
Recheck alignment periodically.
No lubrication required.

Features & Advantages

Why Choose This Product

Compact and Simple Construction

Two hubs and one elastomer spider form a light, compact, and easily assembled coupling.

Misalignment Capability

Handles small angular, parallel, and axial misalignments.

Quick and Easy Replacement

The tyre can be replaced radially without disturbing connected equipment alignment.

No Lubrication Required

Operates dry and clean.

Torsional Flexibility

The spider deflects under load, damping vibration and absorbing shock.

Ease of Maintenance

Elastomer can be replaced without disturbing connected machinery (for AJW, AJL, and AJS types).

Corrosion-Protected Hardware

All metallic components are CED-coated for longterm rust resistance.

Multiple Variants

Standard, snap-wrap, radial, and spacer types cover diverse installation needs.

What Is a Jaw Coupling?

The jaw coupling is a flexible shaft coupling composed of two hubs made of steel, with an elastomer spider between their jaws. The hub is mounted on the drive shaft, and the other is mounted on the driven shaft. As the first hub turns, the jaws of the spider compress, and the torque goes to the second hub and related equipment.

When the spider coupling is being used, its two metal jaws are separating into a single segment. The spider deforms into a small and flexible assembly that allows for increased flexibility, less vibration, and moderate shock forces. The flexible jaw coupling provides a small amount of angular, parallel, and axial misalignment if installed in the recommended locations by the manufacturer. Also called a spider coupling or elastomer coupling, this coupling offers small, clean, and lubrication-free power transmission for a wide variety of industrial drives.

How Does a Jaw Coupling Work?

The torque path through a jaw coupling is as follows: motor or driver, first hub, elastomer spider, second hub, and driven equipment. Rotation of the driver shaft turns the first hub. Its machined jaws compress the lobes of the spider, transferring the force through the elastomer to the jaws on the second hub. The second hub then rotates the driven shaft.

Under load, the spider deforms within its working range. It reduces the shock of the start, dampens torsional vibration, and compensates for small differences in shaft alignment. The coupling cannot eliminate the need for alignment. The extra angle, parallel or axial movement, can accelerate spider wear and increase the load on the connected bearings.

The AJ Series has a failsafe feature. When the spider wears down or fails, the jaws can contact each other and continue to transmit torque temporarily. The metal-to-metal contact may prevent a complete loss of drive, but it will also completely eliminate the normal cushioning and damping. Stop, check, and replace the spider as soon as safe conditions allow.

Main Components

Main Components of a Jaw Coupling

01

Name: Jaw Coupling
Brand: AniGears
SKU: JC-001

Jaw Coupling Hubs

Two metallic hubs connect the coupling to the driving and driven shafts. The hubs are machined with jaws that engage with the spider. The bore of the hub and the keyway provide the mechanical connection to the shaft. They must meet the diameter, key size, and transmitted load of the shaft.

02

Elastomer Spider

The elastomer spider between the jaws transfers the torque when compressed. The spider determines much of the coupling's flexibility, vibration damping, shock-load response, and misalignment tolerance. Correct seating of the spider is important to balance the load across the pair.

03

Fasteners and Clamping Arrangement

The method of fastening depends on whether an AJ, AJW, AJL, or AJS configuration is selected. Snap-wrap, radial-removable, and spacer arrangements may have retaining or clamping features that permit access to the flexible element. All fasteners must be installed and tightened according to AniGears instructions.

AniGears AJ Series Jaw Coupling Types

The four-jaw coupling is designed for equipment layout and maintenance conditions. AniGears offers the standard AJ combination for general use in buildings where conventional hub installation and axial access are readily available. The AJW snap-wrap configuration makes it easy to remove the flexible component. The AJL coupling is a radial or removable coupling for installations that require tight access to the axis during service. AJS includes a spacer for spaces where additional space between equipment and one another is needed or where removal space restrictions apply.

Type	Basic Purpose	Main Benefit
AJ	Standard jaw coupling	Compact solution for general industrial drives
AJW	Snap-wrap arrangement	Easier access for spider replacement
AJL	Radial or removable arrangement	Maintenance accessibility where axial movement is limited
AJS	Spacer arrangement	Suited for defined spacing and equipment-maintenance requirements

If you use one of the spider coupling types, consider the space between the shafts, the distance from the shaft to be removed, access around the coupling, and maintenance of the machinery that is attached. Make sure that you are selecting the correct type of spider coupling according to the latest AniGears catalogue.

Selection Procedure

Jaw Coupling Selection Procedure

Use the following method for selecting the jaw coupling selection before beginning the operation:

Determine the actual absorbed power of the driven equipment in kilowatts.

Determine the service factor for the driver, driven machine, and working load.

Multiply the absorbed power by the service factor to determine the design power.

Determine the recommended coupling rating at the actual operating speed.

Select a coupling size with adequate power or torque.

Verify the maximum allowed bore sizes and the expected shaft misalignment.

Finalize the AJ, AJW, AJL, or AJS arrangement based on installation and maintenance requirements.

For rating, size limits, and service factor values, use the current AniGears catalogue.

Size Selection Procedure

How to Select the Right Jaw Coupling Size?

Correct size prevents vibration, premature wear, and unplanned downtime for the coupling and the equipment connected.

Determine transmitted power

Consider the transmitted power, starting with the power rating of the motor or driver and identifying the power that the driven equipment absorbs. Consider both normal operation and the highest credible demand of operation.

Confirm operating speed

Choose a coupling size rated for the maximum driving speed of the equipment. Speed affects the coupling rating and should be checked rather than taken from the motor nameplate.

Apply the service factor

Be aware of the starting frequency, the number of working days per week, the load variation, the shock load, the reversing duty, and the type of driver and driven machine. Serious loads necessitate more design room than a constant load.

Calculate design power or torque

Apply the service factor specified in the AniGears catalogue method. Compare the resulting rating with the rating available at the actual speed.

Check the bore and keyway

Both hubs must accept their shaft diameters and keyways, but they should not be larger than the maximum bore available for the size of the axle being used.

Verify misalignment

Check for expected angular misalignment, parallel misalignment, and axial movement within the coupling’s published limits. Accurate alignment is critical even when the coupling has a flexible structure that can support minor movement.

Review installation space

Check shaft extensions, hub orientation, gap, removal space, spacer length, and access for inspection or spider replacement. For sizing help, contact the AniGears engineering team with power, speed, shaft diameters, duty, and layout details.

Jaw Coupling Dimensions

Check the dimensions of the shaft and the space available around the machine. Measure the outside diameter, boss length, removal space, hub gap, bore of the cover, allowed speed, rough bore of stock, maximum bore, and weight for each AJ Series size you are considering.

Inspect the dimensions table with your current catalogue and drawing. Confirm bore and keyway drilling before construction, and check the web page table for alignment from row AJ-226 onward.

Jaw Coupling Applications

Electrical motor drives, pumps, fans and blowers, conveyors, gearboxes, material handling equipment, and general industrial machinery may use a jaw coupling.

Pump drives are advantaged by the spider’s ability to damp vibration and cushion moderate starting or running shocks between the motor and pump. Fans and blowers benefit from smooth torque transfer and limited compensation for small alignment variations.

Check power, torque, speed, running conditions, shaft size, environment, and access to the machine for suitability.

Installation of Jaw Couplings

Clean the hubs, spider, shafts, keys, and other components prior to assembly. Remove any dirt, coatings, or burrs that might prevent the hubs from fitting correctly.

Set the shafts with an equal distance between the hub jaws. Check angular and parallel alignment with suitable measuring devices. Insert the spider so that it is fully in place between the jaws.

After assembly, manually rotate the drive to ensure it is safe, check alignment, and add the appropriate guards before operating.

Jaw Coupling Maintenance

AJ Series couplings are non-lubricated, but it is important to include them in the equipment’s preventative maintenance program.

Inspect the elastomer for cracking, tearing, hardening, swelling, permanent deformation, and excessive wear. Inspect the hubs for damage or unusual metal contact, and verify the fasteners are secured.

Features and Advantages

The AJ Series hubs and spiders are small, lightweight, and easy to install. Its torsional flexibility supports vibration damping and shock-load absorption.

With an AJW, AJL, or AJS coupling configuration, the elastomer can be removed without damaging attached machinery. Standard styles include snap-wrap, radial removable, and spacers.

Jaw Coupling vs. Other Flexible Couplings

No coupling design is suitable for every drive. Picking a coupling depends on torque, speed, misalignment, environment, space, and maintenance requirements.

Coupling	Typical Characteristic
Jaw coupling	Compact, flexible, vibration-damping, and lubrication-free
Gear coupling	Higher-torque and heavy-duty applications
Pin bush coupling	Flexible option for many industrial drives
Tyre coupling	Greater flexibility and misalignment capability in suitable duties

A gear coupling, including an EA Series gear coupling, may be considered for heavier torque duties. A pin bush coupling or AB Series pin bush coupling serves many general industrial drives. A tyre coupling can provide increased flexibility, while a resilient coupling offers another alternative for defined operating requirements. Final selection should be based on application data, not a general claim that one type is always better.

When Should a Jaw Coupling Spider Be Replaced

Replace the spider if there are any cracks, tears, swelling, hardening, excessive wear, or deformation. Normal vibration, backlash, impact noise, or any change in response may indicate damage. Check for alignment and operation if your device is showing abnormal wear. A replacement part may fail prematurely if the original problem remains.

Do not use a manufacturer’s recommended replacement interval. The frequency of inspection and timing of replacement should be based on the machine’s duty, start-ups, load-varying parameters, and the working conditions. If a spider is worn prematurely, it keeps the machine’s torque transmission, vibration, and shock absorption intact and reduces the chance of contact between jaws.

Why Choose AniGears Jaw Couplings

AniGears has produced mechanical power transmission and material-handling products since 2007. The company's products include industrial couplings, pulleys, and conveyor components supplied to steel, cement, power, mining, paper, and heavy engineering industries.

AniGears, an ISO 9001:2015 certified manufacturer, provides a precision, high-quality, and application-focused product selection. AJ Series products are CED-coated for long-term corrosion resistance and are available in different configurations to meet your specific installation and maintenance needs. Bore and keyway sizes can be considered in combination with the size of the coupling and the manufacturing options available.