Shaft Couplings for Splined-Shafts

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Shaft Type

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System of Measurement

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Diameter

SAE Spline Size

Maximum Torque

Less than 10,000 in·lbf

10,000 in·lbf to 19,999 in·lbf

20,000 in·lbf to 29,999 in·lbf

30,000 in·lbf to 39,999 in·lbf

40,000 in·lbf or greater

Overall Length

For Rotary Motion

For Shaft Misalignment Type

Shaft Mount Type

Maximum Rotation Speed

Shaft Coupling Flexibility

Length

Material

Overhung Load Capacity

Number of Clamping Screws Included

Finish

Black Oxide

Component

Hub

Spider

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Cap

Socket Head

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43 Products

Keyless Locking Rigid Shaft Couplings for Overhung Loads

Support the weight of a motor and transfer torque to another shaft at the same time with these couplings. Often used to hang motors from conveyor belts and other driven equipment, or to connect long sections of shafts, these couplings eliminate the need for support brackets. Use a torque arm to prevent hanging motors from spinning.

The clamping screws on the coupling face squeeze two outer collars against an inner ring, pressing it tight against shafts to lock them together. This ring-locking mechanism leaves no room for backlash, meaning that all of the turning force created by the motor is passed on to the second shaft. These couplings grip shafts of any shape, so you can install them onto existing keyways and splines without using a key.

To install these couplings, use a torque wrench to tighten each screw to the fastener tightening torque listed for each coupling size. To remove, gradually loosen each screw in sequence until you can slide the coupling on the shaft. Warning: Do not remove any clamping screws from the coupling until the outer collars are separated from the inner ring. The ring is under tension, and a sudden release of the collars can cause serious injury.

Overhung load capacity is the amount of downward force that a coupling can withstand from a motor or other object that it is supporting. To calculate the overhung load, measure the distance from the center of the coupling to the center of gravity of the motor. Multiply that distance by the combined weight of the motor and the portion of the shaft between the coupling and the motor. Do not exceed the overhung load capacity for a coupling.

Steel

Image of Product. Front orientation. Rigid Shaft Couplings. Keyless Locking Rigid Shaft Couplings for Overhung Loads .

	Overall Lg.	OD	Max. Rotation Speed, rpm	Max. Torque, in·lbf	Fastener Tightening Torque, in·lbf	Overhung Load Cap., in·lbf	For Rotary Motion		Each
For Keyed, Round, and Splined Shafts



	1 1/4"	1 7/8"	3"	10,000	8,435	104	2,105	Forward/Reverse, Start/Stop, Continuous	3456N11	0000000


	1 3/8"	1 7/8"	3"	10,000	9,285	104	2,320	Forward/Reverse, Start/Stop, Continuous	3456N12	000000
	1 1/2"	2 3/16"	3 3/4"	8,000	17,160	264	4,290	Forward/Reverse, Start/Stop, Continuous	3456N13	000000
	1 3/4"	2 3/16"	3 3/4"	8,000	20,025	264	5,005	Forward/Reverse, Start/Stop, Continuous	3456N14	000000
	2"	2 11/16"	4 7/16"	7,700	32,685	264	8,170	Forward/Reverse, Start/Stop, Continuous	3456N15	000000
	2 1/4"	3 1/16"	4 3/4"	7,500	44,135	264	11,030	Forward/Reverse, Start/Stop, Continuous	3456N16	000000
	2 1/2"	3 1/16"	4 3/4"	7,500	49,040	264	12,260	Forward/Reverse, Start/Stop, Continuous	3456N17	000000

Splined Flexible Shaft Couplings


Components of a Coupling Shown Assembled	(Each Component Sold Separately)	Diameter

For use with splined shafts, which are commonly found in gearboxes and pumps, these couplings are capable of transmitting more torque than couplings for round and keyed shafts. They have a spider-shaped cushion between two hubs to reduce shock and handle minor shaft misalignment.

A complete coupling consists of two hubs and one spider (each component sold separately). Hubs fasten onto your shafts without damaging them. Tighten the clamping screws to secure.

Buna-N—Buna-N spiders provide good vibration damping and chemical resistance.

Hytrel—Hytrel spiders provide fair vibration damping and excellent chemical resistance.

Polyurethane Rubber—Polyurethane spiders provide fair vibration damping and good chemical resistance.

Hubs									Buna-N Spiders								Hytrel Spiders								Polyurethane Spiders
											Misalignment Capability								Misalignment Capability								Misalignment Capability
Overall Lg.	OD	For Shaft Type	Pitch	Pressure Angle	For Rotary Motion	Choose an SAE Spline Size (Diameter X × Diameter Y)		Each	Max. Rotation Speed, rpm	Max. Torque, in·lbf	Parallel	Angular	Temp. Range, ° F	Spider Material		Each	Max. Rotation Speed, rpm	Max. Torque, in·lbf	Parallel	Angular	Temp. Range, ° F	Spider Material		Each	Max. Rotation Speed, rpm	Max. Torque, in·lbf	Parallel	Angular	Temp. Range, ° F	Spider Material		Each







			Iron Hubs

			2 3/16"	2 7/64"	Splined	0.5"	30°	Continuous, Forward/Reverse, Start/Stop	A (5/8" × 0.509"), B (7/8" × 0.754")	9843T1	000000	9,000	140	0.015"	1°	-40 to 212	Buna-N	6408K75	000000	3,600	400	0.015"	0.5°	-55 to 245	Hytrel	6408K95	000000	3,600	210	0.015"	1°	-30 to 160	Polyurethane Rubber	2410K13	000000


			2 9/16"	2 7/64"	Splined	0.5"	30°	Continuous, Forward/Reverse, Start/Stop	A (5/8" × 0.509"), B (7/8" × 0.754")	9843T2	00000	9,000	140	0.015"	1°	-40 to 212	Buna-N	6408K75	00000	3,600	400	0.015"	0.5°	-55 to 245	Hytrel	6408K95	00000	3,600	210	0.015"	1°	-30 to 160	Polyurethane Rubber	2410K13	00000
			2 7/8"	2 17/32"	Splined	0.5"	30°	Continuous, Forward/Reverse, Start/Stop	A (5/8" × 0.509"), B (7/8" × 0.754"), BB (1" × 0.877")	9843T3	00000	7,000	315	0.015"	1°	-40 to 212	Buna-N	6408K77	00000	3,600	790	0.015"	0.5°	-55 to 245	Hytrel	6408K96	000000	3,600	475	0.015"	1°	-30 to 160	Polyurethane Rubber	2410K15	00000
			3 1/2"	2 17/32"	Splined	0.5"	30°	Continuous, Forward/Reverse, Start/Stop	A (5/8" × 0.509"), B (7/8" × 0.754"), BB (1" × 0.877")	9843T4	00000	7,000	315	0.015"	1°	-40 to 212	Buna-N	6408K77	00000	3,600	790	0.015"	0.5°	-55 to 245	Hytrel	6408K96	000000	3,600	475	0.015"	1°	-30 to 160	Polyurethane Rubber	2410K15	00000
			4 1/4"	3 21/64"	Splined	0.5"	30°	Continuous, Forward/Reverse, Start/Stop	A (5/8" × 0.509"), B (7/8" × 0.754"), BB (1" × 0.877"), C (1 1/4" × 1.087")	9843T5	000000	5,000	790	0.015"	1°	-40 to 212	Buna-N	6408K79	00000	3,600	2,265	0.015"	0.5°	-55 to 245	Hytrel	6408K97	000000	3,600	1,185	0.015"	1°	-30 to 160	Polyurethane Rubber	2410K17	000000
			4 1/2"	3 3/4"	Splined	0.5"	30°	Continuous, Forward/Reverse, Start/Stop	A (5/8" × 0.509"), B (7/8" × 0.754"), BB (1" × 0.877"), C (1 1/4" × 1.087"), D (1 3/4" × 1.506"), E (1 3/4" × 1.506")	9843T6	000000	5,000	1,240	0.015"	1°	-40 to 212	Buna-N	6408K81	00000	3,600	3,705	0.015"	0.5°	-55 to 245	Hytrel	6408K98	000000	3,600	1,860	0.015"	1°	-30 to 160	Polyurethane Rubber	2410K19	000000

Splined-to-Keyed Flexible Shaft Couplings


	(Each Component Sold Separately)

Diameter

Connect splined shafts to keyed shafts. These couplings are commonly used to connect hydraulic pumps, compressors, and other heavy duty equipment, which often have splined shafts, to electric motors and other components that often have keyed shafts. They have a splined hub on one side and a keyed hub on the other. A spider cushion in the middle damps vibration, absorbs shock loads, and adjusts for misalignment. Because the hubs interlock with the spider, these couplings will continue to work even if the spider breaks or wears away. This fail-safe design gives you time to shut down your power source before damage occurs to other components. Lubrication is not required.

A complete coupling consists of two hubs and one spider. All components are sold separately.

Splined Iron Hubs and Buna-N Spiders—For Forward/Reverse, Start/Stop Motion

Buna-N—Buna-N spiders are best for high-speed systems and jobs with frequent starting, stopping, and reversing. The most commonly used spider material, Buna-N absorbs vibration better than other materials but cannot handle as much torque. It won't break down when exposed to oil and chemicals.

Hubs							Keyed Iron Hubs			Buna-N Spiders
												Misalignment Capability
Overall Lg.	OD	Pitch	Pressure Angle	Choose an SAE Spline Size (Diameter X × Diameter Y)		Each	Choose a Shaft Diameter		Each	Max. Rotation Speed, rpm	Max. Torque, in·lbf	Parallel	Angular	Temp. Range, ° F	Spider Material		Each
2 3/16"	2 7/64"	0.5"	30°	A (5/8" × 0.509"), B (7/8" × 0.754")	9843T101	000000	3/8", 1/2", 5/8", 3/4", 1"	3451N801	000000	9,000	140	0.015"	1°	-40 to 212	Buna-N	6408K75	000000
2 7/8"	2 17/32"	0.5"	30°	A (5/8" × 0.509"), B (7/8" × 0.754"), BB (1" × 0.877")	9843T301	00000	1/2", 5/8", 3/4", 1", 1 1/8"	3451N802	00000	7,000	315	0.015"	1°	-40 to 212	Buna-N	6408K77	00000
4 1/2"	3 3/4"	0.5"	30°	A (5/8" × 0.509"), B (7/8" × 0.754"), BB (1" × 0.877"), C (1 1/4" × 1.087"), D (1 3/4" × 1.506"), E (1 3/4" × 1.506")	9843T601	000000	5/8", 3/4", 1", 1 1/8", 1 1/4", 1 1/2", 1 3/4"	3451N803	00000	5,000	1,240	0.015"	1°	-40 to 212	Buna-N	6408K81	00000

Splined Iron Hubs and Polyurethane Rubber Spiders—For Continuous Motion

Polyurethane Rubber—Use polyurethane spiders for high-torque, continuous-motion applications where vibration is a concern. They absorb vibration better than Hytrel spiders but are not as resistant to oil and chemicals. They're not for use in applications with frequent starting, stopping, and reversing.

Hubs							Keyed Iron Hubs			Polyurethane Spiders
												Misalignment Capability
Overall Lg.	OD	Pitch	Pressure Angle	Choose an SAE Spline Size (Diameter X × Diameter Y)		Each	Choose a Shaft Diameter		Each	Max. Rotation Speed, rpm	Max. Torque, in·lbf	Parallel	Angular	Temp. Range, ° F	Spider Material		Each
2 3/16"	2 7/64"	0.5"	30°	A (5/8" × 0.509"), B (7/8" × 0.754")	9843T102	000000	3/8", 1/2", 5/8", 3/4", 1"	3451N804	000000	3,600	210	0.015"	1°	-30 to 160	Polyurethane Rubber	2410K13	000000
2 7/8"	2 17/32"	0.5"	30°	A (5/8" × 0.509"), B (7/8" × 0.754"), BB (1" × 0.877")	9843T302	00000	1/2", 5/8", 3/4", 1", 1 1/8"	3451N805	00000	3,600	475	0.015"	1°	-30 to 160	Polyurethane Rubber	2410K15	00000
4 1/2"	3 3/4"	0.5"	30°	A (5/8" × 0.509"), B (7/8" × 0.754"), BB (1" × 0.877"), C (1 1/4" × 1.087"), D (1 3/4" × 1.506"), E (1 3/4" × 1.506")	9843T602	000000	5/8", 3/4", 1", 1 1/8", 1 1/4", 1 1/2", 1 3/4"	3451N806	00000	3,600	1,860	0.015"	1°	-30 to 160	Polyurethane Rubber	2410K19	000000

Splined Iron Hubs and Hytrel Spiders—For Continuous Motion

Hytrel—Hytrel spiders handle the highest torque of any of our spiders and have the best resistance to oil and chemicals. However, they don't compensate for as much misalignment and are not recommended for applications with frequent starting, stopping, and reversing.

Hubs							Keyed Iron Hubs			Hytrel Spiders
												Misalignment Capability
Overall Lg.	OD	Pitch	Pressure Angle	Choose an SAE Spline Size (Diameter X × Diameter Y)		Each	Choose a Shaft Diameter		Each	Max. Rotation Speed, rpm	Max. Torque, in·lbf	Parallel	Angular	Temp. Range, ° F	Spider Material		Each
2 3/16"	2 7/64"	0.5"	30°	A (5/8" × 0.509"), B (7/8" × 0.754")	9843T103	000000	3/8", 1/2", 5/8", 3/4", 1"	3451N807	000000	3,600	400	0.015"	0.5°	-55 to 245	Hytrel	6408K95	000000
2 7/8"	2 17/32"	0.5"	30°	A (5/8" × 0.509"), B (7/8" × 0.754"), BB (1" × 0.877")	9843T303	00000	1/2", 5/8", 3/4", 1", 1 1/8"	3451N808	00000	3,600	790	0.015"	0.5°	-55 to 245	Hytrel	6408K96	000000
4 1/2"	3 3/4"	0.5"	30°	A (5/8" × 0.509"), B (7/8" × 0.754"), BB (1" × 0.877"), C (1 1/4" × 1.087"), D (1 3/4" × 1.506"), E (1 3/4" × 1.506")	9843T603	000000	5/8", 3/4", 1", 1 1/8", 1 1/4", 1 1/2", 1 3/4"	3451N809	00000	3,600	3,705	0.015"	0.5°	-55 to 245	Hytrel	6408K98	000000