Couplings for 2 1/2" Shafts

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System of Measurement

Shaft Diameter

6.000 mm to 10.000 mm

6.000 mm to 12.000 mm

6.000 mm to 16.000 mm

6.000 mm to 20.000 mm

7 mm

8 mm

9 mm

9.500 mm to 25.000 mm

9.500 mm to 30.000 mm

9.500 mm to 35.000 mm

10 mm

11 mm

12 mm

12.500 mm to 40.000 mm

Shaft Type

Construction

Keyway Width

Material

Maximum Torque

10,000 in·lbf to 19,999 in·lbf

40,000 in·lbf or greater

For Shaft Misalignment Type

Overall Length

Shaft Mount Type

Length

Keyway Depth

For Rotary Motion

Number of Clamping Screws Included

Maximum Rotation Speed

2,965 rpm

3,500 rpm

7,500 rpm

Shaft Coupling Flexibility

REACH

Number of Set Screws Included

Set Screw Material

Stainless Steel

Steel

DFARS Specialty Metals

Exempt

Component

Hub

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

RoHS

Compliant

Export Control Classification Number (ECCN)

EAR99

Clamping Screw Material

45 Products

Set Screw Flexible Shaft Couplings


Hubs, Split Spider, and Retaining Ring Shown Assembled	(Each Component Sold Separately)

Hubs and Spider Shown Assembled	(Each Component Sold Separately)

Each hub includes a set screw (unless noted), which bites into your shaft to hold the coupling in place. Also known as Lovejoy® couplings, these three-piece couplings 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, or two hubs, one split spider, and one retaining ring (all components sold separately). Split spiders are easier to install and replace than standard spiders because there’s no need for tools or removing your hubs. Twist-lock them in place using a retaining ring.

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

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

Hubs							Buna-N Spiders								Hytrel Spiders
									Misalignment Capability								Misalignment Capability
Overall Lg.	OD	For Shaft Type	For Rotary Motion	For Shaft Dia.		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

			5 11/32"	5"	Keyed	Forward/Reverse, Start/Stop	2 1/2"	6408K22	0000000	4,200	2,340	0.015"	1°	-40 to 212	Buna-N	6408K62	000000	4,200	6,225	0.015"	0.5°	-55 to 245	Hytrel	6408K64	0000000

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



	2 1/2"	3 1/16"	4 3/4"	7,500	49,040	264	12,260	Forward/Reverse, Start/Stop, Continuous	3456N17	0000000

High-Speed Vibration-Damping Flexible Shaft Couplings


	(Each Component Sold Separately)

Use these gear-shaped couplings for high-speed and high-torque applications. A rubber center allows flexing so couplings can take on multiple types of misalignment while damping vibration and shock. With no metal-to-metal contact, there’s no need for lubrication. Fasten to your shafts by tightening the set screws, which bite into the shaft to hold it.

A complete coupling consists of two hubs and one center (each component sold separately).

Hubs have a keyway, except hubs for 1⁄4" and 3⁄8" shaft dia. do not have a keyway.

	Hubs						Shaft Coupling Centers
									Misalignment Capability
	Overall Lg.	OD	For Rotary Motion	For Shaft Dia.		Each	Max. Rotation Speed, rpm	Max. Torque, in·lbf	Parallel	Angular	Axial	Temp. Range, ° F	Material		Each
Cast Iron Hubs



		5 1/16"	6 23/64"	Continuous	2 1/2"	6507K7	0000000	3,750	1,800	0.025"	1°	0.125"	-30 to 275	TPE	6507K76	000000

Two-Piece Rigid Shaft Coupling Bridges

When your shafts are not close enough to use standard couplings, these have the length to bridge the gap. Install them anywhere on a shaft without removing components or having access to the ends of the shaft. Tighten the clamping screws to secure. Good for high-torque applications, rigid couplings connect two shafts that are aligned, allowing for no relative movement between the shafts.

Cast Iron

Image of Product. Front orientation. Rigid Shaft Couplings. Two-Piece Rigid Shaft Coupling Bridges .

	Overall Lg.	OD	Max. Rotation Speed, rpm	Max. Torque, in·lbf	For Rotary Motion		Each
For Keyed Shafts



	2 1/2"	9 7/8"	6 1/4"	2,965	17,000	Forward/Reverse, Start/Stop, Continuous	6417K19	000000000

Strong-Grip Clamping Rigid Shaft Couplings

These couplings have the gripping strength to handle higher torque than most other couplings. Couplings clamp evenly around the shaft to create a mar-free hold. Slide onto the end of your shaft and tighten the clamping screws to secure. Good for high-torque applications, rigid couplings connect two shafts that are aligned, allowing for no relative movement between the shafts.

Steel

For Round Shafts

	Overall Lg.	OD	Max. Rotation Speed, rpm	Max. Torque, in·lbf	For Rotary Motion		Each
For Round Shafts



	2 1/2"	8"	4 1/4"	3,500	13,690	Forward/Reverse, Start/Stop, Continuous	9799T8	0000000

Strong-Grip Two-Piece Rigid Shaft Couplings

These couplings have the gripping strength to handle higher torque than most other couplings. Install them anywhere on a shaft without removing components or having access to the ends of the shaft. Tighten the clamping screws to secure. Good for high-torque applications, rigid couplings connect two shafts that are aligned, allowing for no relative movement between the shafts.

Steel

For Round

Shafts

	Overall Lg.	OD	Max. Rotation Speed, rpm	Max. Torque, in·lbf	For Rotary Motion		Each
For Round Shafts



	2 1/2"	8"	4 1/4"	3,500	16,440	Forward/Reverse, Start/Stop, Continuous	9799T18	0000000

Two-Piece Shaft Collars

For Round Shafts

For Keyed Shafts

Attach these collars anywhere along your shaft, which helps when other components are already installed or you can't access the end. They clamp firmly and evenly without marring the shaft, so you can reposition or remove collars later.

Black-Oxide Carbon Steel—Dark and matted for a finished look, but with minimal corrosion resistance. Best for dry environments.

Zinc-Plated Carbon Steel—A step up from plain carbon steel collars, these withstand occasional exposure to moisture.

Chrome-Plated Carbon Steel—Resist moisture and mild cleaning solutions better than zinc-plated collars.

303 Stainless Steel—Withstand moisture and mild cleaning solutions, such as acetone and ammonia. These are easier to machine than other stainless steel collars.

316 Stainless Steel—More corrosion resistant than 303 stainless steel collars. These collars withstand salt water and harsh chemicals, such as bleach, chlorine, and phosphoric acid.

Aluminum—One-third the weight of steel and corrosion resistant.

						For Round Shafts		For Keyed Shafts
				Clamping Screw				Keyway
	For Shaft Dia.	OD	Wd.	Type	No. Included		Each	Wd.	Dp.		Each
Black-Oxide Carbon Steel



		2 1/2"	3 3/4"	7/8"	Socket Head	2	6436K55	000000	5/8"	9/32"	3357K47	000000


		Zinc-Plated Carbon Steel



				2 1/2"	3 3/4"	7/8"	Socket Head	2	2380K53	00000	—	—	———	0


				Chrome-Plated Carbon Steel



						2 1/2"	3 3/4"	7/8"	Socket Head	2	3370K94	00000	—	—	———	0


						303 Stainless Steel



								2 1/2"	3 3/4"	7/8"	Socket Head	2	6436K112	000000	5/8"	9/32"	3329K46	000000


								316 Stainless Steel



										2 1/2"	3 3/4"	7/8"	Socket Head	2	9633T46	000000	—	—	———	0


										Aluminum



												2 1/2"	3 3/4"	7/8"	Socket Head	2	6436K164	00000	—	—	———	0

Quick-Release Shaft Collars with Lever

Flip the lever to install, reposition, and remove these collars. They clamp firmly and evenly without marring your shaft.

Black Anodized Aluminum—One-third the weight of steel and more corrosion resistant than unfinished aluminum.

				Clamping Screw
	For Shaft Dia.	OD	Wd.	Type	No. Included		Each
Black Anodized Aluminum



		2 1/2"	4 3/4"	3/4"	Socket Head	1	1511K25	0000000

Flange-Mount Shaft Collars

Use the tapped and unthreaded holes on the flange to mount components as needed. To install, slide these collars from one end of your shaft and tighten the clamping screws. The collars grip firmly and evenly without marring the shaft, so you can reposition or remove them later. Collars with keyways have a standard ANSI keyway to lock in place shafts, keys, and key stock.

Black-Oxide Carbon Steel—Dark and matted for a finished look, but with minimal corrosion resistance. Best for dry environments.

Aluminum—One-third the weight of steel and corrosion resistant.

				Flange		Keyway			Clamping Screw			Mounting Holes		Unthreaded Mounting Holes
	For Shaft Dia.	OD	Wd.	OD	Thk.	Wd.	Dp.	For Shaft Type	Type	No. Included	Mounting Fasteners Included	Thread Size	No. of	Dia.	No. of		Each
Black-Oxide Carbon Steel



		2 1/2"	4"	1 3/8"	5 23/32"	1/2"	5/8"	9/32"	Keyed	Socket Head	2	No	3/8"-16	3	3/8"	3	9684T38	0000000


		Aluminum



				2 1/2"	4"	1 3/8"	5 23/32"	1/2"	5/8"	9/32"	Keyed	Socket Head	2	No	3/8"-16	3	3/8"	3	9793T28	000000

Quick-Disconnect (QD) Bushings


Clamp-On Shaft Mount

The screw connections on these bushings easily mate to compatible quick-disconnect sprockets and pulleys. Bushings fit quick-disconnect (QD) sprockets and pulleys of the same bushing trade number. As you tighten the included screws, the bushing grips the shaft and pulls it into the sprocket or pulley.

		Keyway
	Overall Wd.	Wd.	Dp.	Fastener Tightening Torque, in·lbf	Material	Includes	For Shaft Dia.		Each
Clamp-On Shaft Mount







				Bushing Trade Number SK

				1 15/16"	5/8"	1/16"	180	Sintered Cast Iron	Clamping Screws, Machine Key	2 1/2"	6086K534	000000

Tight-Hold Shaft Collars

Our strongest shaft collars withstand up to three times the thrust load (force parallel to the shaft) of standard collars. Slide them from one end of your shaft and turn the clamping screws. As the collar tightens, an embedded sleeve spreads force evenly for a firm grip that won't mar the shaft.

Black-Oxide Carbon Steel—Dark and matted for a finished look, but with minimal corrosion resistance. Best for dry environments.

				Clamping Screw
	For Shaft Dia.	OD	Wd.	Type	No. Included		Each
Black-Oxide Carbon Steel



		2 1/2"	5"	1 3/4"	Socket Head	3	9665T8	0000000

Plastic Two-Piece Shaft Collars

Lightweight alternatives to metal two-piece collars for weight-sensitive applications. Attach these collars anywhere along a shaft when other components are already installed or you can't access the ends. They clamp firmly and evenly without marring the shaft, so you can reposition or remove them later.

Acetal—Resist swelling when exposed to moisture.

Nylon—Will swell and weaken when exposed to moisture, so they're best for dry environments.

				Clamping Screw
	For Shaft Dia.	OD	Wd.	Type	No. Included		Each
Nylon



		2 1/2"	4"	1 1/8"	Socket Head	2	60485K83	000000


		Acetal



				2 1/2"	4"	1 1/8"	Socket Head	2	9708T32	00000

Set Screw Two-Piece Shaft Collars

Attach these traditional collars anywhere along a shaft when other components are already installed or you can't access the ends. Their set screw digs into the shaft for a tight, permanent hold, but one that leaves a gouge. For maximum holding power, make sure the set screw is harder than the shaft.

Black-Oxide Carbon Steel—Dark and matted for a finished look, but with minimal corrosion resistance. Best for dry environments.

303 Stainless Steel—Withstand moisture and mild cleaning solutions, such as acetone and ammonia. These are easier to machine than other stainless steel collars.

				Set Screw		Clamping Screw			Each
	For Shaft Dia.	OD	Wd.	Type	No. Included	Type	No. Included		1-24	25-Up
Black-Oxide Carbon Steel



		2 1/2"	3 3/4"	7/8"	Hex Socket	1	Socket Head	2	1069N17	000000	000000


		303 Stainless Steel



				2 1/2"	3 3/4"	7/8"	Hex Socket	1	Socket Head	2	1069N39	000000	000000

Oversized Shaft Collars

Wider and thicker with a larger clamping screw, these shaft collars deliver a stronger grip than standard collars. Slide them from one end of your shaft and tighten the screw. They clamp firmly and evenly without marring the shaft, so you can reposition or remove them later.

Black-Oxide Carbon Steel—Dark and matted for a finished look, but with minimal corrosion resistance. Best for dry environments.

				Clamping Screw
	For Shaft Dia.	OD	Wd.	Type	No. Included		Each
Black-Oxide Carbon Steel



		2 1/2"	4 1/4"	1"	Socket Head	1	9951K25	000000

Face-Mount Shaft Collars

Mount components into the tapped holes on the face of these collars. They slide from one end of a shaft and clamp firmly and evenly to prevent marring, so you can reposition or remove them later.

Black-Oxide Carbon Steel—Dark and matted for a finished look, but with minimal corrosion resistance. Best for dry environments.

303 Stainless Steel—Withstand moisture and mild cleaning solutions, such as acetone and ammonia. These are easier to machine than other stainless steel collars.

				Clamping Screw			Mounting Holes
	For Shaft Dia.	OD	Wd.	Type	No. Included	Mounting Fasteners Included	Thread Size	No. of		Each
Black-Oxide Carbon Steel



		2 1/2"	3 3/4"	7/8"	Socket Head	1	No	5/16"-18	2	9677T9	000000


		303 Stainless Steel



				2 1/2"	3 3/4"	7/8"	Socket Head	1	No	5/16"-18	2	5631T24	000000

Oversized Two-Piece Shaft Collars


For Round Shafts	For Keyed Shafts

Wider and thicker with larger clamping screws, these deliver a more powerful hold than standard two-piece collars. Attach them anywhere along a shaft when other components are already installed or you can't access the ends. They grip evenly without marring the shaft, so you can reposition or remove them later.

Black-Oxide Carbon Steel—Dark and matted for a finished look, but with minimal corrosion resistance. Best for dry environments.

303 Stainless Steel—Withstand moisture and mild cleaning solutions, such as acetone and ammonia. These are easier to machine than other stainless steel collars.

						For Round Shafts		For Keyed Shafts
				Clamping Screw				Keyway
	For Shaft Dia.	OD	Wd.	Type	No. Included		Each	Wd.	Dp.		Each
Black-Oxide Carbon Steel



		2 1/2"	4 1/4"	1"	Socket Head	2	8386K25	0000000	5/8"	5/16"	8386K615	0000000


		303 Stainless Steel



				2 1/2"	4 1/4"	1"	Socket Head	2	8386K627	000000	—	—	———	0

Two-Piece Shaft Collars with Wrench Flats

When adjusting or troubleshooting your drive shaft, turn these collars with a wrench to avoid marring or gouging the surface. To install, snap the two pieces together anywhere along the shaft, which helps when other components are attached or you can't access the ends.

Black-Oxide Carbon Steel—Dark and matted for a finished look, but with minimal corrosion resistance. Best for dry environments.

303 Stainless Steel—Withstand moisture and mild cleaning solutions, such as acetone and ammonia. These are easier to machine than other stainless steel collars.

Aluminum—One-third the weight of steel and corrosion resistant.

					Clamping Screw
	For Shaft Dia.	OD	Wd.	Flat-to-Flat Ht.	Type	No. Included		Each
Black-Oxide Carbon Steel



		2 1/2"	3 3/4"	7/8"	3 9/16"	Socket Head	2	9746T16	000000


		303 Stainless Steel



				2 1/2"	3 3/4"	7/8"	3 9/16"	Socket Head	2	5876T25	000000


				Aluminum



						2 1/2"	3 3/4"	7/8"	3 9/16"	Socket Head	2	6100T27	000000

Set Screw Shaft Collars

Slide these traditional collars from one end of the shaft and tighten the set screw. They dig into the shaft for a secure hold, but one that leaves a gouge. For maximum holding power, make sure the set screw is harder than the shaft.

Black-Oxide Carbon Steel—Dark and matted for a finished look, but with minimal corrosion resistance. Best for dry environments.

Zinc-Plated Carbon Steel—A step up from plain carbon steel collars, these withstand occasional exposure to moisture.

303 Stainless Steel—Withstand moisture and mild cleaning solutions, such as acetone and ammonia. These are easier to machine than other stainless steel collars.

316 Stainless Steel—More corrosion resistant than 303 stainless steel collars. These collars withstand salt water and harsh chemicals, such as bleach, chlorine, and phosphoric acid.

Aluminum—One-third the weight of steel and corrosion resistant.

				Set Screw
	For Shaft Dia.	OD	Wd.	Type	No. Included		Each
Black-Oxide Carbon Steel



		2 1/2"	3 1/2"	1"	Hex Socket	1	9414T45	000000


		Zinc-Plated Carbon Steel



				2 1/2"	3 1/2"	1"	Hex Socket	1	6432K47	00000


				303 Stainless Steel



						2 1/2"	3 1/2"	1"	Hex Socket	1	6462K47	000000


						316 Stainless Steel



								2 1/2"	3 1/2"	1"	Hex Socket	1	9943K55	000000


								Aluminum



										2 1/2"	3 1/2"	1"	Hex Socket	1	9946K46	00000

Shaft Collars

Slide these collars from one end of your shaft and tighten the clamping screw. They grip firmly and evenly without marring the shaft, so you can reposition or remove them later.

Black-Oxide Carbon Steel—Dark and matted for a finished look, but with minimal corrosion resistance. Best for dry environments.

Zinc-Plated Carbon Steel—A step up from plain carbon steel collars, these withstand occasional exposure to moisture.

303 Stainless Steel—Withstand moisture and mild cleaning solutions, such as acetone and ammonia. These are easier to machine than other stainless steel collars.

316 Stainless Steel—More corrosion resistant than 303 stainless steel collars. These collars withstand salt water and harsh chemicals, such as bleach, chlorine, and phosphoric acid.

Aluminum—One-third the weight of steel and corrosion resistant.

				Clamping Screw
	For Shaft Dia.	OD	Wd.	Type	No. Included		Each
Black-Oxide Carbon Steel



		2 1/2"	3 3/4"	7/8"	Socket Head	1	6435K75	000000


		Zinc-Plated Carbon Steel



				2 1/2"	3 3/4"	7/8"	Socket Head	1	9961K53	00000


				303 Stainless Steel



						2 1/2"	3 3/4"	7/8"	Socket Head	1	6435K98	00000


						316 Stainless Steel



								2 1/2"	3 3/4"	7/8"	Socket Head	1	9421T43	000000


								Aluminum



										2 1/2"	3 3/4"	7/8"	Socket Head	1	6157K53	00000