23 mm ID Bearings | McMaster-Carr

Even under extreme drilling pressure, these metric bushings won't press through your jig plate. They’re ANSI Type H bushings, also known as headed bushings. A flanged head acts as a stop, so these bushings won’t move as you push down your drill bit, reamer, or other cutting bit. Use them even in jigs made of thin or soft materials—the head adds support to protect your jig from damage caused by heavy use. Drill bushings ensure accurate, consistent cuts and drilled holes from one part to the next. They’re also used as spacers, shims, and machinery bushings. Made of hardened, ground steel, these bushings hold their shape and resist wear, so they last for many cycles without needing to be replaced.

These bushings meet DIN 172 dimensional standards. This standard is no longer active, but it’s often used as a reference point for making sure parts are compatible with other parts and tools.

To install, fit the bushing into a hole in your jig. In a standard hole, the head will sit above the jig plate; to mount flush, install in a countersunk hole. A chamfered edge on the bottom of the bushing helps center the bushing in the hole. Once it’s centered, press the bushing into the hole with a hydraulic or lever press.

				Head		Tolerance								Each
OD, mm	Lg., mm	For Drill Bit Size	For Drill Bit Size Decimal Equivalent	OD, mm	Thick., mm	ID, mm	OD, mm	Lg., mm	Drill Bushing Type	Material	Hardness	Specifications Met		1-5	6-11	12-Up
23 mm ID
35	31	23 mm	0.9055"	39	5	0.02 to 0.041	0.017 to 0.033	-0.3 to 0.3	H	Steel	Rockwell C61	DIN 172	000000000	000000	000000	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.

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.

Steel Ball Bearings

For Four Splines

												Groove
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	Number of Mounting Holes		Each
23	4	70	60	47	37	2,750	3,600	1,433	2,115	176°	Yes	3.5	36.1	4	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
23	4	350	200	20.6	20	150	52100 Alloy Steel	00000000	0000000

Ball Splines and Bearings

Create a compact linear and rotary motion system for applications requiring complex, fast movements, such as robotics. The grooves on the ball splines transmit rotary power as ball bearings move smoothly and precisely along their length, even at high speeds.

Ball splines are alloy steel for high strength and wear resistance. They're hardened on the outside for additional wear resistance while the center is 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.

Bearings have a retaining ring groove, so they can be positioned in your system with a retaining ring (not included). Flanged bearings have a surface with mounting holes for attaching your load.

Ball Splines

Splined End × Step-Down End

Four Splines

				Spline			Step
Dia., mm	Dia. Tolerance, mm	Lg., mm	Lg. Tolerance, mm	Lg., mm	No. of	Root Dia., mm	Dia., mm	Dia. Tolerance, mm	Lg., mm	Surface Smoothness, microinch	Edge Type	Hardness Rating	Hardness	Heat Treatment		Each
Metric—52100 Alloy Steel
Splined End × Step-Down End
23	-0.021 to 0	350	-0.7874 to 0.7874	200	4	20.6	20	-0.021 to 0	150	16	Chamfered	Very Hard	Rockwell C60	Case Hardened	00000000	0000000

Flanged Bearings

					Material
For Spline Dia., mm	For No. of Splines	Overall Lg., mm	Flange OD, mm	OD, mm	Bearing	Ball	Dynamic Load Cap., lbs.	Max. Dynamic Torque, in.-lbs.	With Retaining Ring Grooves	Number of Mounting Holes		Each
23	4	70	60	37	Steel	Steel	2,750	1,433	Yes	4	00000000	0000000

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About Linear Bearings

Metric Press-Fit Drill Bushings with Head

Mounted Linear Bearings for Ball Splines

Ball Splines and Bearings