31 mm Length Bearings | McMaster-Carr

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T-Slotted Framing Component

T-Slotted Framing Rail Profile

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Rail Height

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Mounting Location

REACH Compliance

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Number of Flanges

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26 Products

Metric Press-Fit Drill Bushings with Head

Shown in Countersunk Hole

Shown in Standard Hole

Even under extreme drilling pressure, these metric bushings won't press through your jig plate. A flanged head on the top of the bushing acts as a stop, preventing it from moving as you push down your drill bit, reamer, or other cutting bit. Drill bushings ensure accurate, consistent cuts and drilled holes from one part to the next. They sometimes also work as spacers, shims, and machinery bushings. Made of hardened, ground steel, these bushings hold their shape and resist wear over time. The flanged head protects your jig plate from damage caused by heavy use.

Although it's no longer an active standard, DIN 172 is still a common reference point for making sure parts are compatible with other parts and tools.

These bushings work in both countersunk and standard drill holes. To install, place the bushing inside the hole in your jig. A chamfered edge on the bottom of the bushing helps center the bushing in the hole. Once centered, press the bushing into the hole with a hydraulic or lever press.

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

		Head		Tolerance								Each
OD, mm	Lg., mm	OD, mm	Thick., mm	ID, mm	OD, mm	Lg., mm	Drill Bushing Type	Material	Hardness	Specifications Met		1-5	6-11	12-Up
18.5 mm ID
30	31	34	5	0.02 to 0.041	0.015 to 0.028	-0.3 to 0.3	H	Steel	Rockwell C61	DIN 172	000000000	000000	000000	000000
19 mm ID
30	31	34	5	0.02 to 0.041	0.015 to 0.028	-0.3 to 0.3	H	Steel	Rockwell C61	DIN 172	000000000	00000	00000	00000
19.5 mm ID
30	31	34	5	0.02 to 0.041	0.015 to 0.028	-0.3 to 0.3	H	Steel	Rockwell C61	DIN 172	000000000	00000	00000	00000
20 mm ID
30	31	34	5	0.02 to 0.041	0.015 to 0.028	-0.3 to 0.3	H	Steel	Rockwell C61	DIN 172	000000000	00000	00000	00000
20.5 mm ID
30	31	34	5	0.02 to 0.041	0.015 to 0.028	-0.3 to 0.3	H	Steel	Rockwell C61	DIN 172	000000000	00000	00000	00000
21 mm ID
30	31	34	5	0.02 to 0.041	0.015 to 0.028	-0.3 to 0.3	H	Steel	Rockwell C61	DIN 172	000000000	00000	00000	00000
21.5 mm ID
30	31	34	5	0.02 to 0.041	0.015 to 0.028	-0.3 to 0.3	H	Steel	Rockwell C61	DIN 172	000000000	00000	00000	00000
22 mm ID
30	31	34	5	0.02 to 0.041	0.015 to 0.028	-0.3 to 0.3	H	Steel	Rockwell C61	DIN 172	000000000	00000	00000	00000
22.5 mm ID
35	31	39	5	0.02 to 0.041	0.017 to 0.033	-0.3 to 0.3	H	Steel	Rockwell C61	DIN 172	000000000	00000	00000	00000
23 mm ID
35	31	39	5	0.02 to 0.041	0.017 to 0.033	-0.3 to 0.3	H	Steel	Rockwell C61	DIN 172	000000000	00000	00000	00000
23.5 mm ID
35	31	39	5	0.02 to 0.041	0.017 to 0.033	-0.3 to 0.3	H	Steel	Rockwell C61	DIN 172	000000000	00000	00000	00000
24 mm ID
35	31	39	5	0.02 to 0.041	0.017 to 0.033	-0.3 to 0.3	H	Steel	Rockwell C61	DIN 172	000000000	00000	00000	00000
24.5 mm ID
35	31	39	5	0.02 to 0.041	0.017 to 0.033	-0.3 to 0.3	H	Steel	Rockwell C61	DIN 172	000000000	00000	00000	00000
25 mm ID
35	31	39	5	0.02 to 0.041	0.017 to 0.033	-0.3 to 0.3	H	Steel	Rockwell C61	DIN 172	000000000	00000	00000	00000
25.5 mm ID
35	31	39	5	0.02 to 0.041	0.017 to 0.033	-0.3 to 0.3	H	Steel	Rockwell C61	DIN 172	000000000	00000	00000	00000
26 mm ID
35	31	39	5	0.02 to 0.041	0.017 to 0.033	-0.3 to 0.3	H	Steel	Rockwell C61	DIN 172	000000000	00000	00000	00000

T-Slotted Framing Linear Bearings and Track Rollers

Mount components to these load-rated bearings and track rollers to add linear motion along T-slotted rails.

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

Flanged Sleeve Bearings for Single Rails

Bearing with 2 Flanges

Bearings move more accurately than other T-slotted framing linear motion components, such as track rollers, and are often used in automated systems and other applications requiring repetitive motion. They’re lined with slippery, durable plastic and have no moving parts. These bearings withstand exposure to dirt, water, impact, and vibration. To adjust how they fit on your rail, slide one of the included shims between the bearing pad and bearing housing.

Flanged sleeve bearings mount in two different orientations: one where the bearing slides along the rail and another where the bearing acts as a mount allowing the rail to slide. Fasten bolts through the flange holes to secure them to rails, loads, and other surfaces.

Bearing pads replace worn pads.

Linear Bearings									Replacement Bearing Pads
For Rail Ht.	Dynamic Load Capacity	Static Load Capacity, lbs.	Lg.	(A)	(B)	Includes		Each		Each
Standard Strength—2 Flange
Silver Anodized Aluminum
25mm	30 lbs. @ 100 fpm	200	47mm	74mm	31mm	One Carriage Panel, Three Bearing Pads, 10 Shims	0000000	000000	00000000	00000
25mm	110 lbs. @ 100 fpm	500	100mm	74mm	31mm	One Carriage Panel, Six Bearing Pads, 20 Shims	00000000	00000	00000000	0000

Flanged Sleeve Bearings for Double Rails

Bearing pads replace worn pads.

Linear Bearings									Replacement Bearing Pads
For Rail Ht.	Dynamic Load Capacity	Static Load Capacity, lbs.	Lg.	(A)	(B)	Includes		Each		Each
Standard Strength—2 Flange
Silver Anodized Aluminum
50mm	55 lbs. @ 100 fpm	500	47mm	99mm	31mm	One Carriage Panel, Four Bearing Pads, 20 Shims	00000000	000000	00000000	00000
50mm	105 lbs. @ 100 fpm	600	100mm	99mm	31mm	One Carriage Panel, Eight Bearing Pads, 30 Shims	00000000	000000	00000000	0000

Replacement Shim Sets

For Rail Ht.					Slot
Single	Double	Lg.	Wd.	Thickness	Lg.	Wd.	Includes	Material	Color		Each
1", 25mm	2", 50mm	1 7/8"	13/16"	0.005"	1 1/2"	3/16"	20 Shims	Polyethylene Plastic	White	00000000	00000

High-Capacity Track Rollers

Components Sold Separately

High-capacity track rollers are best for moving heavy items that don’t require high precision, such as sliding doors. They travel inside channel tracks (sold separately). Attach your sliding component to the other side of the track roller. Included locking end stops bring a sliding component to a stop and hold it in place.

Note: Sliding doors must be guided above and below to keep the door moving straight and prevent it from swinging.

					Roller						Silver Carriage
For Rail Ht., mm	Capacity, lbs.	(A), mm	(B), mm	(C), mm	Dia., mm	Color	Material	Carriage Material	Includes	Mounting Fasteners Included		Each
Bottom/Top-Mount for Single Rails
Ball Bearing—Steel
40	65	25	110	31	21	White	Polyurethane Rubber	Aluminum	Two Carriages, Two Locking End Stops, Two Slides with Four Rollers	Yes	0000000	000000

Channel Tracks for High-Capacity Track Rollers

Channel tracks have a T-slot on one side, so you can integrate high-capacity track rollers into your system.

Lg., ft.	For Rail Ht., mm	Material		Each
3	40	Anodized Aluminum	0000000	000000
4	40	Anodized Aluminum	0000000	00000
6	40	Anodized Aluminum	0000000	00000