18.2 mm ID Bearings | McMaster-Carr

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About Linear Bearings

For Four Splines

Combine these bearings with a ball spline to create a compact linear and rotary motion system for applications with fast, complex movements, such as robotics. These bearings move smoothly and precisely even at high speeds along ball splines while grooves on the ball spline transmit rotary power. Clip a retaining ring into the groove on these bearings to position them in your system. Use the keyway and included machine key for attaching your load.

Splines are alloy steel for high strength and wear resistance. They're hardened only on the outside, so they stand up to repeated motion while keeping their center soft enough to absorb stress from shifting loads. Those with a step-down end have a shoulder near the end to stop gears, sprockets, and bearings.

For technical drawings and 3-D models, click on a part number.

Steel Ball Bearings

For Four Splines

										Groove			Keyway
For Spline Dia., mm	For No. of Splines	Overall Lg., mm	OD, mm	Dynamic Load Capacity, lbs.	Static Load Capacity, lbs.	Max. Dynamic Torque, in.-lbs.	Max. Static Torque, in.-lbs.	Max. Temp., °F	With Retaining Ring Grooves	Wd., mm	Dia., mm	Includes	Lg., mm	Wd., mm	Dp., mm		Each
18.2	4	60	32	1,750	2,500	734	1,177	176°	Yes	3.1	30.2	Machine Key	26	4	2.5	00000000	0000000

Steel Splines

Splined End × Step-Down End

Four Splines

					Step
Dia., mm	No. of Splines	Lg., mm	Spline Lg., mm	Root Dia., mm	Dia., mm	Lg., mm	Material		Each
Splined End × Step-Down End
18.2	4	350	200	16.4	15	150	52100 Alloy Steel	00000000	0000000

Mounted Linear Bearings for Ball Splines

A flange with mounting holes makes it easy to attach a load to these bearings. Create a compact linear and rotary motion system for robots and other applications requiring complex, fast movements, by combining them with ball splines. These bearings move smoothly and precisely even at high speeds along ball splines while grooves on the ball spline transmit rotary power. Clip a retaining ring (not included) into the groove on these bearings to position them in your system.

For technical drawings and 3-D models, click on a part number.

Steel Ball Bearings

For Four Splines

												Groove		Mounting Holes
For Spline Dia., mm	For No. of Splines	Overall Lg., mm	Flange OD, mm	Bolt Circle Dia., mm	OD, mm	Dynamic Load Capacity, lbs.	Static Load Capacity, lbs.	Max. Dynamic Torque, in.-lbs.	Max. Static Torque, in.-lbs.	Max. Temperature, ° F	With Retaining Ring Grooves	Wd., mm	Dia., mm	No. of	Thread Size		Each
18.2	4	60	51	40	32	1,750	2,500	734	1,177	176°	Yes	3	31.3	4	M4 × 0.7 mm	00000000	0000000

Steel Splines

Splined End × Step-Down End

Four Splines

					Step
Dia., mm	No. of Splines	Lg., mm	Spline Lg., mm	Root Dia., mm	Dia., mm	Lg., mm	Material		Each
Splined End × Step-Down End
18.2	4	350	200	16.4	15	150	52100 Alloy Steel	00000000	0000000