31 mm OD Bearings | McMaster-Carr

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About Linear Bearings

About Ball and Roller Bearings

Steel balls and washers allow these bearings to handle higher loads than bearings with stainless steel components. With an open design, they dissipate heat more efficiently than one-piece thrust ball bearings.

Bearings with steel cage and with bronze cage handle higher loads and speeds than bearings with a plastic cage.

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

					Thrust Load Cap., lbs.
For Shaft Dia.	OD	Thick.	Cage Material	Washer Material	Dynamic	Static	Max. Speed, rpm	Lubrication	Temp. Range, °F	Includes		Each
Open
15mm	31mm	12mm	Steel	Steel	2,300	3,700	8,500	Required	-40° to 240°	Two Washers	0000000	000000

Thin-Profile Crossed-Roller Bearings

For a more compact machine, these bearings have thinner inner and outer rings than high-load crossed-roller bearings. Route hydraulic lines, electrical wiring, and other components through the inside of the bearing. The rollers face in alternating directions to allow for rigid, accurate motion under any combination of radial, thrust, and moment (twisting) loads. Use in applications where highly accurate motion is necessary, such as machine tools and industrial robots.

Open bearings dissipate heat more efficiently than sealed bearings.

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

				Combined Load Cap., lbs.
For Shaft Dia., mm	For Housing ID, mm	Wd., mm	Ring Material	Dynamic	Static	Max. Speed, rpm	Lubrication	Temp. Range, °F		Each
Open
20	31	5	Steel	310	290	2,900	Required	0° to 230°	0000000	0000000

Needle-Roller Thrust Bearings

Thinner rollers allow these bearings to fit in tighter spaces than tapered-roller thrust bearings. Because of the large contact area between the rollers and washers (not included), these bearings are great for medium to heavy duty, low-friction jobs. For use on hardened and ground surfaces.

Washers allow you to use the bearing on unhardened and unground surfaces.

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

Bearings

Bearing

			Thrust Load Cap., lbs.
For Shaft Dia.	OD	Thick.	Dynamic	Static	Max. Speed, rpm	Lubrication	For Shaft Surface Smoothness (Ra), microns	Temp. Range, °F		Each
Steel Rollers
Open
18mm	31mm	2mm	2,140	5,480	10,000	Required	0.2	0° to 240°	0000000	000000

Washers

Washer

For Shaft Dia.	OD	Thick.	Washer Material		Each
18mm	31mm	1mm	Steel	0000000	00000

Washers for Needle-Roller Thrust Bearings

Washer

Adapt needle-roller thrust bearings to use on unhardened, unground surfaces.

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

For Shaft Dia.	OD	Thick.	Washer Material		Each
18mm	31mm	1mm	Steel	0000000	00000

Linear Bearings for Ball Splines

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.

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
16	4	50	31	1,350	2,500	531	973	176°	Yes	1.6	29.4	Machine Key	17.5	3.5	2	00000000	000000

Steel Splines

Splined on Both Ends

Four Splines

Splined on Both Ends
Dia., mm	No. of Splines	Lg., mm	Spline Lg., mm	Root Dia., mm	Material		Each
16	4	200	200	14.2	52100 Alloy Steel	000000000	0000000
16	4	700	700	14.2	52100 Alloy Steel	000000000	000000

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
16	4	50	50	40	31	1,350	2,500	531	973	176°	Yes	1.6	29.4	4	M4 × 0.7 mm	000000000	0000000

Steel Splines

Splined on Both Ends

Four Splines

Splined on Both Ends
Dia., mm	No. of Splines	Lg., mm	Spline Lg., mm	Root Dia., mm	Material		Each
16	4	200	200	14.2	52100 Alloy Steel	000000000	0000000
16	4	700	700	14.2	52100 Alloy Steel	000000000	000000

Metric Press-Fit Drill Bushings

Also known as jig bushings, these metric drill bushings fit inside fixture plate holes to guide drill bits, counterbores, reamers, and other cutting tools. They improve accuracy so that your drilled holes and cuts are consistent from part to part. Known for their versatility, drill bushings are also used as spacers, shims, and machinery bushings. These bushings are made of hardened, ground steel that holds its shape and resists wear, so they last for many cycles without needing to be replaced.

All bushings have a chamfer on the outside that centers the bushing as you place it into the hole. Press into place with a manual or hydraulic press. They also have internal chamfers, so it's easier to insert bits, pins, and punches into the bushing. DIN 179 bushings meet dimensional and material standards that make sure they're compatible with other parts and tools. Although DIN 179 is no longer an active standard, it's still a common reference point for designers.

Don't see the size you need? Additional sizes are available.

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

				Tolerance								Each
OD, mm	Lg., mm	Internal Chamfer	For Drill Bit Size	ID, mm	OD, mm	Lg., mm	Drill Bushing Type	Material	Hardness	Specifications Met		1-5	6-11	12-Up
25 mm ID
31	15	One End	25 mm	0.02 to 0.041	0.017 to 0.033	-0.2 to 0.2	PM	Steel	Rockwell C61	DIN 179	000000000	000000	000000	000000
31	50	One End	25 mm	0.02 to 0.041	0.017 to 0.033	-0.3 to 0.3	PM	Steel	Rockwell C61	DIN 179	000000000	00000	00000	00000
31	60	One End	25 mm	0.02 to 0.041	0.017 to 0.033	-0.3 to 0.3	PM	Steel	Rockwell C61	DIN 179	000000000	00000	00000	00000

Ball Screw/Splines and Bearings

From one compact system, transmit linear or rotary motion or both at once (sometimes called spiral motion). Because of these different motions, these ball screw/splines and bearings create efficient, fluid movements in complex automated applications, such as pick-and-place robots.

The ball bearings move smoothly and precisely, even at high speeds. They're powered independently, so you can drive one bearing at a time or both together to coordinate movements.

The ball screw/splines are hardened on the surface, so they stand up to repeated motion. They’re also hollow, so you can run electrical wiring, compressed air tubing, coolants, or lubricant through their center.

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

Spline		Thread					Ball Screw Bearing				Ball Spline Bearing
Lg.	No. of	Lg.	Direction	ID, mm	Lg., mm	Root Dia., mm	OD, mm	Overall Lg., mm	Dynamic Load Cap., lbs.	Static Load Cap., lbs.	OD, mm	Overall Lg., mm	Dynamic Load Cap., lbs.	Static Load Cap., lbs.	Max. Dynamic Torque, in.-lbs.	Temp. Range, ° F		Each
Metric—1055 Carbon Steel
16mm Dia. (Tolerance: -0.018mm to 0mm)
500 mm	6	360 mm	Right Hand	11	500	15.15	32	40	870	1,610	31	50	1,590	2,830	277	5° to 176°	0000000	000000000

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About Linear Bearings

About Ball and Roller Bearings

Thrust Ball Bearings

Thin-Profile Crossed-Roller Bearings

Needle-Roller Thrust Bearings

Washers for Needle-Roller Thrust Bearings

Linear Bearings for Ball Splines

Mounted Linear Bearings for Ball Splines

Metric Press-Fit Drill Bushings

Ball Screw/Splines and Bearings