56mm Length Bearings | McMaster-Carr

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T-Slotted Framing Rail Profile

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Number of Flanges

Carriage Profile

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DFARS Compliance

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10 Products

Selecting Compatible Lead Screws and Nuts

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. Some bushings have internal chamfers on both ends, so no matter which end of the bushing is inserted into your jig, your bits, pins, and other tooling enter easily. Having an internal chamfer on the bottom of your bushing may cause shavings to get caught and bind as you remove the bit, however.

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
30 mm ID
42	56	One End	30 mm	0.02 to 0.041	0.017 to 0.033	-0.3 to 0.3	PM	Steel	Rockwell C61	DIN 179	000000000	000000	000000	000000
48	56	One End	30 mm	0.007 to 0.02	0.043 to 0.059	-0.01 to 0.254	PM	Steel	Rockwell C61	__	000000000	00000	00000	00000

				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
40 mm ID
55	56	Both Ends	40 mm	0.025 to 0.05	0.02 to 0.039	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	000000	000000	000000
55	56	One End	40 mm	0.025 to 0.05	0.02 to 0.039	-0.3 to 0.3	PM	Steel	Rockwell C61	DIN 179	000000000	00000	00000	00000

Fast-Travel Ball Screws and Nuts

Multiple thread channels (also known as thread starts) create faster linear travel than ball screws with a single thread start. Internal ball bearings provide smooth low-friction travel in applications that require high speeds, accurate positioning, and repeatable movement. To ensure compatibility, select components that have the same thread size and number of thread starts. Ball nuts are furnished with a tube to keep ball bearings in place. Do not remove the tube until you are ready to install the nuts onto the screws.

Carbon steel ball screws and nuts are case hardened, so they resist wear better than standard carbon steel. However, they are less corrosion resistant than black-oxide alloy steel screws and nuts.

Travel distance per turn, also known as screw lead, is the distance a ball nut moves with one revolution of the ball screw.

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

Flange Ball Nuts—Right-Hand Threaded

				Flange
	Thread Size	Lg.	Dia.	Dia.	Thick.	No. of Thread Starts	Travel Distance per Turn	Bolt Circle Dia.	Hardness	Dynamic Thrust Load Cap., lbs.	Max. Backlash	Temperature Range, °F		Each
Carbon Steel
E	M15	56mm	33mm	57mm	10mm	4	20mm	45mm	Rockwell C56	2,250	0.04mm	32° to 150°	00000000	0000000

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.

Heavy duty flanged bearings have threaded inserts in their bearing pads for a tighter grip on the bearing housing. They work well in pick-and-place, parts-transfer, and other high-speed applications with frequent starts, stops, and changes in speed.

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
Heavy Duty Strength—2 Flange
Silver Anodized Aluminum
45mm	25 lbs. @ 100 fpm	500	80mm	120mm	56mm	One Carriage Panel, Three Bearing Pads, 10 Shims	00000000	000000	00000000	00000
45mm	53 lbs. @ 100 fpm	650	170mm	120mm	56mm	One Carriage Panel, Six Bearing Pads, 20 Shims	00000000	000000	00000000	0000

Optional Hand Brakes

Single Arm Grip

Hand brakes hold sleeve bearing carriages in place on the rail. Single arm brakes have an adjustable grip. If space is tight, you can ratchet the grip out of the way without releasing the brake.

For Rail Ht.
Single	Lg.	Wd.	Projection	Material	Color		Each
Single Arm Grip Style
45mm	89mm	22.1mm	56.8mm	Zinc	Silver	00000000	000000

Replacement Shim Sets

For Rail Ht.				Slot
Single	Lg.	Wd.	Thickness	Lg.	Wd.	Includes	Material	Color		Each
45mm	80mm	36mm	0.08mm	66.5mm	8mm	10 Shims	Polyethylene Plastic	White	00000000	00000

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Selecting Compatible Lead Screws and Nuts

Metric Press-Fit Drill Bushings

Fast-Travel Ball Screws and Nuts

T-Slotted Framing Linear Bearings and Track Rollers