Bushings for 4mm Shafts | McMaster-Carr

Install and forget these self-lubricating bearings. All are made from porous metal and saturated with oil to reduce maintenance and downtime. A good all-around choice, they are used in everything from palm-sized fans in electronics to tire-sized pulleys. Although these bearings will work in most conditions, oil may drip away if temperatures get too high. Consider a graphite-lubricated bearing for higher temperatures or places where you can’t afford the mess. All are fabricated, lubricated, and inspected in the U.S.

Flanged sleeve bearings combine a sleeve and thrust bearing in one. The flange supports thrust loads and prevents the bearing from being pushed out of place. The sleeve is the simplest way to support the load of a rotating shaft while reducing friction. Also known as plain bearings.

841 Bearing Bronze—A classic choice for a starter pick. Also known as SAE 841 bearings.

High-Load 863 Iron Copper—Iron makes these bearings harder, stronger, and more resistant to sudden starts and stops than 841 bearing bronze. However, they operate at slower speeds. The increased iron content makes these bearings appear silver.

Mineral Oil Base—Mineral oil consistently lubricates at most temperatures but doesn’t last as long as synthetic oil.

Synthetic Oil Base—A high-quality lubricant makes all the difference. Synthetic oil is less sensitive to temperature changes than mineral oil, so it won't get runny and leak away at higher temperatures.

	For Housing ID, mm	Lg., mm	Flange OD, mm	Flange Thk., mm	Dynamic Radial Load Cap. @ Speed	Dynamic Thrust Load Cap. @ Speed	Base Oil	Temp. Range, ° F		Each
841 Bearing Bronze



	4	5.2	4	7	0.6	49 lb. @ 120 rpm	80 lb. @ 120 rpm	Synthetic Oil	-35 to 300	6659K204	000000


	4	5.5	3	9.5	0.75	37 lb. @ 120 rpm	180 lb. @ 120 rpm	Synthetic Oil	-35 to 300	6659K205	00000
	4	5.5	6	9.5	0.75	70 lb. @ 120 rpm	180 lb. @ 120 rpm	Synthetic Oil	-35 to 300	6659K206	00000
	4	7	6	9	1.5	70 lb. @ 120 rpm	155 lb. @ 120 rpm	Synthetic Oil	-35 to 300	6659K207	00000
	4	7	6	10	1.5	70 lb. @ 120 rpm	200 lb. @ 120 rpm	Synthetic Oil	-35 to 300	6659K65	0000
	4	8	4	12	2	49 lb. @ 120 rpm	310 lb. @ 120 rpm	Mineral Oil	-35 to 300	6659K142	0000
	4	8	8	12	2	95 lb. @ 120 rpm	310 lb. @ 120 rpm	Mineral Oil	10 to 220	6659K113	0000


	High-Load 863 Iron Copper



			4	7	6	10	1.5	145 lb. @ 120 rpm	280 lb. @ 120 rpm	Synthetic Oil	-15 to 300	2938T751	0000

Dry-Running Flanged Sleeve Bearings

Made of naturally slippery plastic so you’ll never have to add lubricant. They’re ideal for clean environments where you need to prevent oil drips or graphite flakes. Compared to metal bearings, they are lighter and will never rust.

Ultra-Low-Friction Rulon J—These bearings glide effortlessly for applications with frequent starts and stops, such as conveyor systems.

Moisture-Resistant Ultra-Low-Friction Plastic Blend—These bearings won't warp or swell from humidity or direct contact with water. They glide effortlessly for applications with frequent starts and stops, such as conveyor systems.

	For Housing ID, mm	Lg., mm	Flange OD, mm	Flange Thk., mm	Dynamic Radial Load Cap. @ Speed	Dynamic Thrust Load Cap. @ Speed	Color	Temp. Range, ° F		Each
Ultra-Low-Friction Rulon J



	4	7	6	9	1.5	27 lb. @ 120 rpm	50 lb. @ 120 rpm	Gold	-400 to 500	6377K312	000000


	Moisture-Resistant Ultra-Low-Friction Plastic Blend



			4	5.5	3	9.5	0.75	36 lb. @ 120 rpm	70 lb. @ 120 rpm	Yellow	-50 to 190	2705T113	0000


			4	5.5	6	9.5	0.75	70 lb. @ 120 rpm	70 lb. @ 120 rpm	Yellow	-50 to 190	2705T114	0000

Oil-Embedded Sleeve Bearings

With no moving parts, sleeve bearings are the simplest way to support the load of a rotating shaft while reducing friction. Also known as plain bearings.

841 Bearing Bronze—A classic choice for a starter pick. Also known as SAE 841 bearings.

	For Housing ID, mm	Lg., mm	Dynamic Radial Load Cap. @ Speed	Base Oil	Temp. Range, ° F		Each
841 Bearing Bronze



	4	7	4	49 lb. @ 120 rpm	Synthetic Oil	-35 to 300	6658K112	00000


	4	7	6	70 lb. @ 120 rpm	Synthetic Oil	-35 to 300	6658K65	0000
	4	7	8	95 lb. @ 120 rpm	Synthetic Oil	-35 to 300	6658K113	0000
	4	8	3	37 lb. @ 120 rpm	Synthetic Oil	-35 to 300	6658K114	0000
	4	8	4	49 lb. @ 120 rpm	Synthetic Oil	-35 to 300	6658K722	0000
	4	8	6	70 lb. @ 120 rpm	Synthetic Oil	-35 to 300	6658K115	0000
	4	8	8	95 lb. @ 120 rpm	Synthetic Oil	-35 to 300	6658K723	0000


	High-Load 863 Iron Copper



			4	8	8	195 lb. @ 120 rpm	Synthetic Oil	-15 to 300	2868T308	0000

Dry-Running Metal-Reinforced Plastic Sleeve Bearings

Combine slippery plastic with the strength of metal. The PTFE core is naturally slippery, so you’ll never have to add lubricant. These bearings also keep your workspace clean with no lubricant to drip or flake and attract dust. Compared to all-metal bearings, they are lighter.

With no moving parts, sleeve bearings are the simplest way to support the load of a rotating shaft while reducing friction. Also known as plain bearings.

Bronze-Backed PTFE with Steel Shell—A good all-around, economical choice. Although these bearings are stronger than aluminum, they can only be used in dry environments where corrosion is not a concern.

	For Housing ID, mm	Lg., mm	Dynamic Radial Load Cap. @ Speed	Temp. Range, ° F		Each
Bronze-Backed PTFE with Steel Shell



	4	5.5	6	370 lb. @ 120 rpm	-320 to 530	6679K31	00000

Dry-Running Sleeve Bearings

With no moving parts, sleeve bearings are the simplest way to support the load of a rotating shaft while reducing friction. Also known as plain bearings.

Ultra-Low-Friction Rulon J—These bearings glide effortlessly for applications with frequent starts and stops, such as conveyor systems.

High-Load Ultra-Low-Friction Plastic Blend—Create the least amount of friction of any bearings that we offer. They handle heavier loads than Rulon J bearings but can't withstand the same extreme temperatures.

								Each
	For Shaft Dia., mm	For Housing ID, mm	Lg., mm	Dynamic Radial Load Cap. @ Speed	Color	Temp. Range, ° F		1-24	25-99	100-Up
Ultra-Low-Friction Rulon J



		4	7	6	27 lb. @ 120 rpm	Gold	-400 to 550	6377K512	000000	000000	000000


		High-Load Ultra-Low-Friction Plastic Blend



				4	5.5	6	105 lb. @ 120 rpm	Yellow	-55 to 190	6377K139	0000	0000	0000

Easy-Install Dry-Running Flanged Sleeve Bearings

A gap running along the length of these bearings allows you to quickly squeeze them into a housing—no tools required. Made of naturally slippery plastic, there’s no need to add messy oil that could drip and attract dust.

Nylon—The most popular choice, nylon is wear resistant yet economical. Keep in mind, though, that it will swell and weaken when exposed to moisture.

	For Housing ID, mm	Lg., mm	Flange OD, mm	Flange Thk., mm	Dynamic Radial Load Cap. @ Speed	Dynamic Thrust Load Cap. @ Speed	Color	Temp. Range, ° F		Each
Nylon



	4	5.2	4.6	7	0.6	7 lb. @ 40 rpm	11 lb. @ 40 rpm	White	0 to 200	1281N33	00000

Ultra-Low-Friction Oil-Embedded Sleeve Bearings

Our slipperiest metal bearings, these are ideal for machinery with frequent starts and stops, such as conveyors. With nonstick PTFE particles added to the oil, they reduce friction to minimize wear and heat, so equipment runs more efficiently and lasts longer. All are fabricated, lubricated, and inspected in the U.S.

With no moving parts, sleeve bearings are the simplest way to support the load of a rotating shaft while reducing friction. Also known as plain bearings.

841 Bearing Bronze—A classic choice for a starter pick. Also known as SAE 841 bearings.

	For Housing ID, mm	Lg., mm	Dynamic Radial Load Cap. @ Speed	Base Oil	Lubricant Additive	Temp. Range, ° F	Specs. Met		Each
841 Bearing Bronze



	4	7	6	70 lb. @ 120 rpm	Synthetic Oil	PTFE	-60 to 300	ASTM B438	1688K116	00000


	4	8	4	49 lb. @ 120 rpm	Synthetic Oil	PTFE	-60 to 300	ASTM B438	1688K117	0000
	4	8	8	95 lb. @ 120 rpm	Synthetic Oil	PTFE	-60 to 300	ASTM B438	1688K118	0000


	High-Load 863 Iron Copper



			4	7	6	145 lb. @ 120 rpm	Synthetic Oil	PTFE	-60 to 300	—	7460N116	0000


			4	8	4	95 lb. @ 120 rpm	Synthetic Oil	PTFE	-60 to 300	—	7460N117	0000
			4	8	8	195 lb. @ 120 rpm	Synthetic Oil	PTFE	-60 to 300	—	7460N118	0000

Ultra-Low-Friction Oil-Embedded Flanged Sleeve Bearings

841 Bearing Bronze—A classic choice for a starter pick. Also known as SAE 841 bearings.

	For Housing ID, mm	Lg., mm	Flange OD, mm	Flange Thk., mm	Dynamic Radial Load Cap. @ Speed	Dynamic Thrust Load Cap. @ Speed	Base Oil	Lubricant Additive	Temp. Range, ° F	Specs. Met		Each
841 Bearing Bronze



	4	7	6	10	1.5	70 lb. @ 120 rpm	200 lb. @ 120 rpm	Synthetic Oil	PTFE	-60 to 300	ASTM B438	1677K215	00000


	High-Load 863 Iron Copper



			4	7	6	10	1.5	145 lb. @ 120 rpm	280 lb. @ 120 rpm	Synthetic Oil	PTFE	-60 to 300	—	7119N114	0000

Oil-Embedded Panel-Mount Sleeve Bearings

Reduce upkeep with sleeve bearings that lubricate themselves. Made from porous, oil-saturated bronze, they release a thin film of lubrication upon startup to keep shafts spinning. With no moving parts, sleeve bearings withstand dusty, dirty environments better than ball or roller bearings. However, with more friction generated, they're less effective at high speeds. They mount securely in thin panels.

Steel Housing—Best for dry environments as moisture will cause them to rust.

Clinch Panel Mount—Secure these self-clinching bearings into sheet metal panels for a permanent hold. Install them using an air-powered or hydraulic press—no need for precision-bored holes or machined mounts. They're not for use in plastic panels.

Misalignment Capability—Bearings compensate for as much shaft misalignment as the degree listed. This extends the life of the bearing and protects against wear if shafts are slightly askew.

	Flange OD, mm	Flange Thk., mm	Dynamic Radial Load Cap. @ Speed	Misalignment Capability		Each
840 Bearing Bronze Bearing with Steel Housing







	Clinch Panel Mount

	4	12.7	10.2	14	1	125 lb. @ 120 rpm	5°	2032N22	00000

Dry-Running Thrust Bearings

Made of naturally slippery plastic so there's no lubricant to maintain or make a mess. These bearings are ideal for spic-and-span spaces since oil won't drip off, wash out, or collect dust over time. They'll also never rust.

Moisture-Resistant Plastic Blend—Similar to acetal, these bearings won't warp or swell from water or humidity.

	OD, mm	Thk., mm	Dynamic Thrust Load Cap. @ Speed	Color	Temp. Range, ° F		Each
Moisture-Resistant Plastic Blend



	4	8	0.5	6 lb. @ 120 rpm	Gray	-40 to 260	8920N22	00000


	4	9	0.6	8.5 lb. @ 120 rpm	Gray	-40 to 260	8920N23	0000
	4	10	0.5	11 lb. @ 120 rpm	Gray	-40 to 260	8920N24	0000
	4	11	0.5	13 lb. @ 120 rpm	Gray	-40 to 260	8920N25	0000

Dry-Running Sleeve Bearings for Food and Beverage

Made of plastics permitted by the US FDA for contact with food, these bearings won’t release harmful, smelly, and distasteful impurities into your food or beverage production line. These self-lubricating plastics eliminate the need for oil, resulting in less maintenance and improved hygiene. You’ll find them inside food-processing equipment such as mixers, conveyors, and fillers.

With no moving parts, sleeve bearings are the simplest way to support the load of a rotating shaft while reducing friction. Also known as plain bearings.

Moisture-Resistant Plastic Blend—Similar to UHMW, these bearings will keep their shape after washdowns but won’t hold up to steam cleaning. They're bright blue so they are easy to spot if they fall into your production line.

	For Housing ID, mm	Lg., mm	Dynamic Radial Load Cap. @ Speed	Color	Temp. Range, ° F	Specs. Met		Each
Moisture-Resistant Plastic Blend



	4	5.5	6	65 lb. @ 120 rpm	Blue	-50 to 190	FDA Compliant 21 CFR 177.1550	6657K111	00000

Mounted Linear Ball Bearings

Bearings are for use with round end-supported shafts. All have end seals to keep lubricant in and dirt out.

Fixed Alignment

Image of Product. Front orientation. Contains Annotated. Linear Bearings. Mounted Linear Ball Bearings .

Fixed-alignment bearings are for use where shaft misalignment is unlikely.

		Overall, mm					Load Capacity, lb.		Temp., ° F			Mounting Holes
	For Shaft Dia., mm	Lg.	Wd.	Ht.	Ctr. Ht., mm	With End Seals	Dynamic	Static	Min.	Max.	For Shaft Material	No. of	Dia., mm	Thread Size		Each
Steel Bearings with 6061 Aluminum Housing



		4	15	17	11	5.5	Yes	19	28	-4	176	Stainless Steel, Steel	4	3	M3 × 0.5 mm	9338T63	000000

Linear Ball Bearings

Bearings are for use with round end-supported shafts. To install, slide bearings into a housing (not included).

Fixed Alignment

Without Retaining

Ring Grooves

Fixed-alignment bearings are for use where shaft misalignment is unlikely.

Stainless Steel Ball—Bearings with stainless steel balls are more corrosion resistant than bearings with steel balls.

							Load Capacity, lb.		Temp., ° F
	For Shaft Dia., mm	Overall Lg., mm	OD, mm	For Housing ID	With Retaining Ring Grooves	With End Seals	Dynamic	Static	Min.	Max.	For Shaft Material		Each
440C Stainless Steel Bearings with Stainless Steel Balls



		4	12	8	8.000 mm to 8.015 mm	No	No	15	25	-4	176	Stainless Steel, Steel	3766N11	000000


		Steel Bearings with Steel Balls



				4	12	8	8.000 mm to 8.015 mm	No	No	15	25	-4	176	Stainless Steel, Steel	61205K72	00000

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.

Blue Passivated Zinc-Plated Carbon Steel—Withstand moisture and mild chemicals better than standard zinc-plated-steel collars. The blue passivated finish makes it easy to identify metric collars at a glance.

Carbon Steel—Strong and easy to machine. Use in dry environments, since moisture will cause steel to rust.

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
	For Shaft Dia., mm	OD, mm	Wd., mm	Type	No. Included		Each
Black-Oxide Carbon Steel



		4	10	5	Hex Socket	1	57485K64	00000


		Blue Passivated Zinc-Plated Carbon Steel



				4	8	5	Hex Socket	1	6057N12	0000


				Carbon Steel



						4	8	5	Hex Socket	1	6056N12	0000


						303 Stainless Steel



								4	8	5	Hex Socket	1	6058N12	0000


								4	10	5	Hex Socket	1	57485K21	0000

Oil-Embedded Flanged Sleeve Bearings for Food and Beverage

These lead-free bearings are infused with a food-grade oil that is odorless, colorless, tasteless, and safe for incidental contact with food. They’re often used in food and beverage processing, packing, and handling equipment. All are made from porous metal and saturated with oil to reduce maintenance and downtime. If you need a bearing rated for direct contact with food, consider dry-running flanged sleeve bearings for food and beverage. All are fabricated, lubricated, and inspected in the U.S.

841 Bearing Bronze—A classic choice for a starter pick. Also known as SAE 841 bearings.

	For Housing ID, mm	Lg., mm	Flange OD, mm	Flange Thk., mm	Dynamic Radial Load Cap. @ Speed	Dynamic Thrust Load Cap. @ Speed	Base Oil	Temp. Range, ° F	Food Industry Std.		Each
841 Bearing Bronze



	4	7	6	10	1.5	70 lb. @ 120 rpm	200 lb. @ 120 rpm	Synthetic Oil	-75 to 300	FDA Compliant 21 CFR 178.3570	3746K45	00000


	High-Load 863 Iron Copper



			4	7	6	10	1.5	145 lb. @ 120 rpm	280 lb. @ 120 rpm	Synthetic Oil	-75 to 300	FDA Compliant 21 CFR 178.3570	5373N115	0000

Oil-Embedded Thrust Bearings

Our simplest-to-use thrust bearings, with no moving parts and no need to lubricate. Their porous surface releases oil over time, so you can install and forget them. While they run in most conditions, oil may drip away if temperatures climb too high. For extremely hot environments, consider graphite-lubricated bearings. All are fabricated, lubricated, and inspected in the U.S.

841 Bearing Bronze—A balance of strength and speed makes these bearings a good choice for most applications. Also known as SAE 841 bearing bronze.

	OD, mm	Thk., mm	Dynamic Thrust Load Cap. @ Speed	Base Oil	Temp. Range, ° F		Each
841 Bearing Bronze



	4	8	1.5	280 lb. @ 120 rpm	Synthetic Oil	-35 to 300	2011N137	00000

Quick-Grip Screw-Clamp Bushings

Also known as Trantorque bushings, these tighten with a twist of the collar nut—no screws needed. As you tighten the collar nut, the inner sleeve contracts onto the shaft and the outer sleeve expands to hold your sprocket, pulley, or gear.

	OD, mm	Overall Wd., mm	Max. Torque, in·lbf		Each
Steel



	4	16	19	120	2298K52	000000

Ultra-Low-Friction Oil-Embedded Thrust Bearings

Our slipperiest metal thrust bearings glide on machines with frequent starts and stops, such as conveyors. Their oil contains nonstick PTFE particles that reduce wear and heat, extending the life of your equipment. All are fabricated, lubricated, and inspected in the U.S.

High-Load 863 Iron Copper—Iron makes these bearings harder, stronger, and more resistant to sudden starts and stops than 841 bearing bronze. However, they run at slower speeds. The increased iron content also makes them appear silver.

	OD, mm	Thk., mm	Dynamic Thrust Load Cap. @ Speed	Base Oil	Lubricant Additive	Temp. Range, ° F		Each
High-Load 863 Iron Copper



	4	8	1.5	200 lb. @ 120 rpm	Synthetic Oil	PTFE	-60 to 300	7380N174	000000

Oil-Embedded Sleeve Bearings for Food and Beverage

These lead-free bearings are infused with a food-grade oil that is odorless, colorless, tasteless, and safe for unintended contact with food. They’re often used in food and beverage processing, packing, and handling equipment. All are made from porous metal and saturated with oil to reduce maintenance and downtime. If you need a bearing rated for contact with food, consider dry-running sleeve bearings for food and beverage. All are fabricated, lubricated, and inspected in the U.S.

With no moving parts, sleeve bearings are the simplest way to support the load of a rotating shaft while reducing friction. Also known as plain bearings.

841 Bearing Bronze—A classic choice for a starter pick. Also known as SAE 841 bearings.

	For Housing ID, mm	Lg., mm	Dynamic Radial Load Cap. @ Speed	Base Oil	Temp. Range, ° F	Specs. Met		Each
841 Bearing Bronze



	4	7	6	70 lb. @ 120 rpm	Synthetic Oil	-75 to 300	FDA Compliant 21 CFR 178.3570	7095K116	00000


	High-Load 863 Iron Copper



			4	8	8	195 lb. @ 120 rpm	Synthetic Oil	-75 to 300	FDA Compliant 21 CFR 178.3570, ASTM B439	7407N118	0000

Two-Piece Rigid Shaft Couplings

Install and remove these shaft couplings without disconnecting the shafts, motors, and other attached components—they’re made in two pieces so you don’t need to slide them onto shaft ends. They’re also useful when you have limited access to the ends of the shafts. These couplings clamp onto the shafts, creating a secure hold that won’t mar them. Good for high-torque applications, they have a rigid construction. However, their rigidity means these couplings can only connect shafts that are well aligned.

Black-Oxide Steel

For Round

Shafts

Steel couplings are stronger and handle higher torque loads than aluminum and stainless steel couplings.

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



	4 mm × 4 mm	22	15	4,000	25	Forward/Reverse, Start/Stop, Continuous	6508T129	000000

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.

Hubs							Buna-N Spiders
									Misalignment Capability
Overall Lg., mm	OD, mm	For Shaft Type	For Rotary Motion	For Shaft Dia., mm		Each	Max. Rotation Speed, rpm	Max. Torque, in·lbf	Parallel	Angular	Temp. Range, ° F	Spider Material		Each







			Steel Hubs

			21	16	Round	Forward/Reverse, Start/Stop	4	6133N11	00000	31,000	3	0.015"	1°	-40 to 212	Buna-N	6408K61	00000

High-Temperature Linear Ball Bearings

The choice for low-friction motion in high-temperature environments. Bearings are for use with round end-supported shafts and have a fixed-alignment design for applications where shaft misalignment is unlikely. To install, slide bearings into a housing (not included).

Fixed Alignment

Without Retaining

Ring Grooves

440C Stainless Steel Bearing—Stainless steel bearings are more corrosion resistant than steel bearings.

							Load Capacity, lb.			Temp., ° F
	For Shaft Dia., mm	Overall Lg., mm	OD, mm	For Housing ID	With Retaining Ring Grooves	With End Seals	Dynamic	Static	Dynamic Load Cap. @ Temp.	Min.	Max.	For Shaft Material		Each
440C Stainless Steel Bearings with Stainless Steel Balls



		4	12	8	8.000 mm to 8.015 mm	No	Yes	19	28	19 lb. @ 248° F	-4	248	Stainless Steel, Steel	6368K92	000000


		Steel Bearings with Steel Balls



				4	12	8	8.000 mm to 8.015 mm	No	No	15	25	15 lb. @ 230° F	-4	230	Stainless Steel, Steel	63255K42	00000

Clamping Vibration-Damping Precision Flexible Shaft Couplings


	(Each Component Sold Separately)

Designed to grip evenly around your shaft, these couplings provide more holding power than set screw couplings without marring the shaft. Tighten the clamping screws to secure. Good for precision motor and pump applications, the spider-shaped cushion reduces shock and compensates for minor shaft misalignment. Couplings allow zero backlash (no play).

A complete coupling consists of two hubs and one spider (each component sold separately). Hubs are lightweight, corrosion-resistant aluminum. Spiders are polyurethane for fair vibration damping and good chemical resistance.

Hubs							Durometer 98A Polyurethane Spiders							Durometer 92A Polyurethane Spiders							Durometer 85A Polyurethane Spiders
									Misalignment Capability							Misalignment Capability							Misalignment Capability
Overall Lg.	OD	For Shaft Type	For Rotary Motion	For Shaft Dia., mm		Each	Max. Rotation Speed, rpm	Max. Torque, in·lbf	Parallel	Angular	Temp. Range, ° F		Each	Max. Rotation Speed, rpm	Max. Torque, in·lbf	Parallel	Angular	Temp. Range, ° F		Each	Max. Rotation Speed, rpm	Max. Torque, in·lbf	Parallel	Angular	Temp. Range, ° F		Each







			2024 Aluminum Hubs

			1 7/64"	3/4"	Round	Forward/Reverse, Start/Stop	4	9845T1	000000	8,000	30	0.003"	0.8°	0 to 180	9845T11	000000	8,000	18	0.004"	0.9°	0 to 180	9845T12	000000	8,000	10	0.005"	1°	0 to 180	9845T13	000000


			21.8 mm	15 mm	Round	Forward/Reverse, Start/Stop	4	9845T51	00000	8,000	16	0.002"	0.8°	0 to 180	9845T485	00000	8,000	10	0.004"	0.9°	0 to 180	9845T486	00000	8,000	4.8	0.005"	1°	0 to 180	9845T487	00000

Plastic Shaft Collars

Lightweight alternatives to metal collars for weight-sensitive applications. 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.

Acetal—Resist swelling when exposed to moisture.

				Clamping Screw
	For Shaft Dia., mm	OD, mm	Wd., mm	Type	No. Included		Each
Acetal



		4	16	9	Socket Head	1	3761N101	000000

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.

				Clamping Screw
	For Shaft Dia., mm	OD, mm	Wd., mm	Type	No. Included		Each
Acetal



		4	16	9	Socket Head	2	3585N11	000000

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.

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., mm	OD, mm	Wd., mm	Type	No. Included		Each
Black-Oxide Carbon Steel



		4	18	9	Socket Head	1	57445K21	00000


		303 Stainless Steel



				4	18	9	Socket Head	1	9616T13	00000


				Aluminum



						4	16	9	Socket Head	1	9506T1	0000

Two-Piece Shaft Collars

For Round 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.

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 Round Shafts
	For Shaft Dia., mm	OD, mm	Wd., mm	Type	No. Included		Each
Black-Oxide Carbon Steel



		4	16	9	Socket Head	2	6063K11	00000


		303 Stainless Steel



				4	16	9	Socket Head	2	3369K11	00000


				316 Stainless Steel



						4	16	9	Socket Head	2	9652T12	00000


						Aluminum



								4	16	9	Socket Head	2	9520T1	00000

Servomotor Precision Flexible Shaft Couplings

Able to handle high twisting forces as well as misalignment, these couplings are good for high-performance servomotor applications. Couplings are aluminum and stainless steel for corrosion resistance and allow zero backlash (no play). They grip evenly around your shaft for a strong hold without marring the shaft. Tighten the clamping screws to secure.

					Misalignment Capability
For Shaft Diameter	Overall Lg.	OD	Max. Rotation Speed, rpm	Max. Torque, in·lbf	Parallel	Angular	Axial	For Rotary Motion		Each







			2017 Aluminum and 304 Stainless Steel

			3/16" × 4 mm	1 1/64"	3/4"	10,000	8	0.004"	1°	0.008"	Forward/Reverse, Start/Stop	2764K114	000000


			1/4" × 4 mm	1 1/64"	3/4"	10,000	8	0.004"	1°	0.008"	Forward/Reverse, Start/Stop	2764K119	00000
			5/16" × 4 mm	1 1/64"	3/4"	10,000	8	0.004"	1°	0.008"	Forward/Reverse, Start/Stop	2764K125	00000
			4 mm × 4 mm	1 1/64"	3/4"	10,000	8	0.004"	1°	0.008"	Forward/Reverse, Start/Stop	2764K129	00000
			4 mm × 5 mm	1 1/64"	3/4"	10,000	8	0.004"	1°	0.008"	Forward/Reverse, Start/Stop	2764K131	00000
			4 mm × 6 mm	1 1/64"	3/4"	10,000	8	0.004"	1°	0.008"	Forward/Reverse, Start/Stop	2764K132	00000
			4 mm × 8 mm	1 1/64"	3/4"	10,000	8	0.004"	1°	0.008"	Forward/Reverse, Start/Stop	2764K133	00000

High-Speed Servomotor Precision Flexible Shaft Couplings

Connect shafts and ball screws to high-speed servomotors and stepper motors—these shaft couplings handle four times more speed than standard servomotor couplings. They’re often found on high-torque motors that frequently start and stop, such as those used with packaging machines, press brakes, and semiconductor manufacturing equipment.

With aluminum hubs joined by a flexible fluoroelastomer or Buna-N core, these shaft couplings dampen vibration and adjust for misalignment. When machines accelerate and decelerate quickly, these couplings remain stiff to maintain accuracy and repeatability, which prevents equipment from moving out of place. They also resist backlash, meaning all of the turning force from the motor is passed on to the connected shaft. The core resists water, petroleum-based chemicals, and inorganic acids while also insulating bearings, encoders, and other shaft components from stray electric current. Clamping screws provide hold without marring shafts; they’re useful in applications where shafts are frequently assembled and disassembled.

						Misalignment Capability
	For Shaft Diameter	Overall Lg.	OD	Max. Rotation Speed, rpm	Max. Torque, in·lbf	Parallel	Angular	Axial	For Rotary Motion		Each
2017 Aluminum with Fluoroelastomer Center



		4 mm × 4 mm	29/32"	19/32"	40,000	9	0.006"	1.5°	0.008"	Forward/Reverse, Start/Stop	6853N103	0000000


		4 mm × 5 mm	29/32"	19/32"	40,000	9	0.006"	1.5°	0.008"	Forward/Reverse, Start/Stop	6853N104	000000
		4 mm × 6 mm	29/32"	19/32"	40,000	9	0.006"	1.5°	0.008"	Forward/Reverse, Start/Stop	6853N105	000000
		4 mm × 8 mm	1 1/32"	3/4"	30,000	18	0.006"	1.5°	0.008"	Forward/Reverse, Start/Stop	6853N109	00000

Set Screw Vibration-Damping Precision Flexible Shaft Couplings


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

The included set screw holds the coupling in place. Good for precision motor and pump applications, the spider-shaped cushion reduces shock and compensates for minor shaft misalignment. Couplings allow zero backlash (no play).

Hubs							Durometer 98A Polyurethane Spiders							Durometer 92A Polyurethane Spiders							Durometer 85A Polyurethane Spiders
									Misalignment Capability							Misalignment Capability							Misalignment Capability
Overall Lg., mm	OD, mm	For Shaft Type	For Rotary Motion	For Shaft Dia., mm		Each	Max. Rotation Speed, rpm	Max. Torque, in·lbf	Parallel	Angular	Temp. Range, ° F		Each	Max. Rotation Speed, rpm	Max. Torque, in·lbf	Parallel	Angular	Temp. Range, ° F		Each	Max. Rotation Speed, rpm	Max. Torque, in·lbf	Parallel	Angular	Temp. Range, ° F		Each







			2024 Aluminum Hubs

			21	15	Round	Continuous, Forward/Reverse, Start/Stop	4	9939T31	000000	8,000	16	0.002"	0.8°	-10 to 180	9939T444	000000	8,000	10	0.004"	0.9°	-10 to 180	9939T445	000000	8,000	4.8	0.005"	1°	-10 to 180	9939T446	000000