56mm Length Bearings | McMaster-Carr

Internal ball bearings provide smooth low-friction travel in applications that require high speeds, accurate positioning, and repeatable movement. Also known as single-start ball screws and nuts, these have a single thread that runs the length of the screw. They operate with more torque than fast-travel ball screws and nuts. To ensure compatibility, select components that have the same thread size and travel distance per turn. 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.

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.

Platform Ball Nuts—Right-Hand Threaded

Alloy Steel
Thread Size	Lg., mm	Wd., mm	Ht., mm	Center Ht., mm	No. of Thread Starts	Travel Distance per Turn, mm	Hardness	Dynamic Thrust Load Cap., lbs.	Max. Backlash, mm	Includes	Temperature Range, °F		Each
M18	56	48	44	17	1	8	Rockwell C58	2,940	0.1	Seals	Not Rated to 175°	00000000	0000000

Threadless Lead Screw Nuts

Shown with Rotary Shaft (Not Included)

Install these nuts on a rotary shaft to create a linear positioning system without a lead screw. Instead of threads, a set of angled ball bearings drives the nut along a shaft as it spins. Nuts move towards you when the shaft rotates clockwise and away from you when the shaft rotates counterclockwise. To prevent overload damage, these nuts can be adjusted to slip and stop travelling at a given thrust load. Thrust loads are loads that are applied parallel to the shaft. Bearings are permanently lubricated to save maintenance time and effort.

Travel distance per turn is the distance the nut moves with one revolution of the shaft.

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

Metric

			Overall				Mounting Hole
For Shaft Dia., mm	Travel Distance per Turn, mm	Max. Thrust Cap. Before Slip, lbs.	Lg., mm	Wd., mm	Ht., mm	Ctr. Ht., mm	Ctr.-to-Ctr. Lg., mm	Thread Size	Thread Pitch, mm	No. of	Construction	Temperature Range, °F		Each
Aluminum
8	8	16	56	28	40	14	18	M4	0.7	2	Two Piece	0° to 230°	0000000	0000000

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. 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
26 mm ID
42	56	One End	26 mm	0.007 to 0.02	0.043 to 0.059	-0.35 to 0.35	PM	Steel	Rockwell C61	__	000000000	000000	000000	000000
26.5 mm ID
42	56	Both Ends	26.5 mm	0.02 to 0.041	0.017 to 0.033	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	00000	00000	00000
42	56	One End	26.5 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
27 mm ID
42	56	Both Ends	27 mm	0.02 to 0.041	0.017 to 0.033	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	00000	00000	00000
42	56	One End	27 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
27.5 mm ID
42	56	Both Ends	27.5 mm	0.02 to 0.041	0.017 to 0.033	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	00000	00000	00000
42	56	One End	27.5 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
28 mm ID
42	56	Both Ends	28 mm	0.02 to 0.041	0.017 to 0.033	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	00000	00000	00000
42	56	One End	28 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
28.5 mm ID
42	56	Both Ends	28.5 mm	0.02 to 0.041	0.017 to 0.033	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	00000	00000	00000
42	56	One End	28.5 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
29 mm ID
42	56	Both Ends	29 mm	0.02 to 0.041	0.017 to 0.033	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	00000	00000	00000
42	56	One End	29 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
29.5 mm ID
42	56	Both Ends	29.5 mm	0.02 to 0.041	0.017 to 0.033	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	00000	00000	00000
42	56	One End	29.5 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

				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	Both Ends	30 mm	0.02 to 0.041	0.017 to 0.033	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	000000	000000	000000
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	00000	00000	00000
48	56	One End	30 mm	0.007 to 0.02	0.043 to 0.059	-0.35 to 0.35	PM	Steel	Rockwell C61	__	000000000	00000	00000	00000
30.5 mm ID
48	56	Both Ends	30.5 mm	0.025 to 0.05	0.017 to 0.033	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	000000	00000	00000
48	56	One End	30.5 mm	0.025 to 0.05	0.017 to 0.033	-0.3 to 0.3	PM	Steel	Rockwell C61	DIN 179	000000000	00000	00000	00000
31 mm ID
48	56	Both Ends	31 mm	0.025 to 0.05	0.017 to 0.033	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	000000	00000	00000
48	56	One End	31 mm	0.025 to 0.05	0.017 to 0.033	-0.3 to 0.3	PM	Steel	Rockwell C61	DIN 179	000000000	00000	00000	00000
31.5 mm ID
48	56	Both Ends	31.5 mm	0.025 to 0.05	0.017 to 0.033	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	000000	00000	00000
48	56	One End	31.5 mm	0.025 to 0.05	0.017 to 0.033	-0.3 to 0.3	PM	Steel	Rockwell C61	DIN 179	000000000	00000	00000	00000
32 mm ID
48	56	Both Ends	32 mm	0.025 to 0.05	0.017 to 0.033	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	000000	00000	00000
48	56	One End	32 mm	0.025 to 0.05	0.017 to 0.033	-0.3 to 0.3	PM	Steel	Rockwell C61	DIN 179	000000000	00000	00000	00000
32.5 mm ID
48	56	Both Ends	32.5 mm	0.025 to 0.05	0.017 to 0.033	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	000000	00000	00000
48	56	One End	32.5 mm	0.025 to 0.05	0.017 to 0.033	-0.3 to 0.3	PM	Steel	Rockwell C61	DIN 179	000000000	00000	00000	00000
33 mm ID
48	56	Both Ends	33 mm	0.025 to 0.05	0.017 to 0.033	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	000000	00000	00000
48	56	One End	33 mm	0.025 to 0.05	0.017 to 0.033	-0.3 to 0.3	PM	Steel	Rockwell C61	DIN 179	000000000	00000	00000	00000
33.5 mm ID
48	56	Both Ends	33.5 mm	0.025 to 0.05	0.017 to 0.033	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	000000	00000	00000
48	56	One End	33.5 mm	0.025 to 0.05	0.017 to 0.033	-0.3 to 0.3	PM	Steel	Rockwell C61	DIN 179	000000000	00000	00000	00000
34 mm ID
48	56	Both Ends	34 mm	0.025 to 0.05	0.017 to 0.033	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	000000	00000	00000
48	56	One End	34 mm	0.025 to 0.05	0.017 to 0.033	-0.3 to 0.3	PM	Steel	Rockwell C61	DIN 179	000000000	00000	00000	00000
34.5 mm ID
48	56	Both Ends	34.5 mm	0.025 to 0.05	0.017 to 0.033	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	000000	00000	00000
48	56	One End	34.5 mm	0.025 to 0.05	0.017 to 0.033	-0.3 to 0.3	PM	Steel	Rockwell C61	DIN 179	000000000	00000	00000	00000
35 mm ID
48	56	Both Ends	35 mm	0.025 to 0.05	0.017 to 0.033	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	000000	00000	00000
48	56	One End	35 mm	0.025 to 0.05	0.017 to 0.033	-0.3 to 0.3	PM	Steel	Rockwell C61	DIN 179	000000000	00000	00000	00000
55	56	One End	35 mm	0.009 to 0.025	0.053 to 0.072	-0.35 to 0.35	PM	Steel	Rockwell C61	__	000000000	00000	00000	00000
35.5 mm ID
55	56	Both Ends	35.5 mm	0.025 to 0.05	0.02 to 0.039	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	00000	00000	00000
55	56	One End	35.5 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
36 mm ID
55	56	Both Ends	36 mm	0.025 to 0.05	0.02 to 0.039	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	00000	00000	00000
55	56	One End	36 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
36.5 mm ID
55	56	Both Ends	36.5 mm	0.025 to 0.05	0.02 to 0.039	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	00000	00000	00000
55	56	One End	36.5 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

				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
37 mm ID
55	56	Both Ends	37 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	37 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
37.5 mm ID
55	56	Both Ends	37.5 mm	0.025 to 0.05	0.02 to 0.039	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	00000	00000	00000
55	56	One End	37.5 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
38 mm ID
55	56	Both Ends	38 mm	0.025 to 0.05	0.02 to 0.039	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	00000	00000	00000
55	56	One End	38 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
38.5 mm ID
55	56	Both Ends	38.5 mm	0.025 to 0.05	0.02 to 0.039	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	00000	00000	00000
55	56	One End	38.5 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
39 mm ID
55	56	Both Ends	39 mm	0.025 to 0.05	0.02 to 0.039	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	00000	00000	00000
55	56	One End	39 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
39.5 mm ID
55	56	Both Ends	39.5 mm	0.025 to 0.05	0.02 to 0.039	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	00000	00000	00000
55	56	One End	39.5 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
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	00000	00000	00000
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
40.5 mm ID
55	56	Both Ends	40.5 mm	0.025 to 0.05	0.02 to 0.039	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	00000	00000	00000
55	56	One End	40.5 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
41 mm ID
55	56	Both Ends	41 mm	0.025 to 0.05	0.02 to 0.039	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	00000	00000	00000
55	56	One End	41 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
41.5 mm ID
55	56	Both Ends	41.5 mm	0.025 to 0.05	0.02 to 0.039	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	00000	00000	00000
55	56	One End	41.5 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
42 mm ID
55	56	Both Ends	42 mm	0.025 to 0.05	0.02 to 0.039	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	00000	00000	00000
55	56	One End	42 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
62	56	One End	42 mm	0.009 to 0.025	0.053 to 0.072	-0.35 to 0.35	PM	Steel	Rockwell C61	__	000000000	00000	00000	00000
42.5 mm ID
62	56	Both Ends	42.5 mm	0.025 to 0.05	0.02 to 0.039	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	00000	00000	00000
62	56	One End	42.5 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
43 mm ID
62	56	Both Ends	43 mm	0.025 to 0.05	0.02 to 0.039	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	00000	00000	00000
62	56	One End	43 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
43.5 mm ID
62	56	Both Ends	43.5 mm	0.025 to 0.05	0.02 to 0.039	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	00000	00000	00000
62	56	One End	43.5 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

				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
44 mm ID
62	56	Both Ends	44 mm	0.025 to 0.05	0.02 to 0.039	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	000000	000000	000000
62	56	One End	44 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
44.5 mm ID
62	56	Both Ends	44.5 mm	0.025 to 0.05	0.02 to 0.039	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	00000	00000	00000
62	56	One End	44.5 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
45 mm ID
62	56	Both Ends	45 mm	0.025 to 0.05	0.02 to 0.039	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	00000	00000	00000
62	56	One End	45 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
45.5 mm ID
62	56	Both Ends	45.5 mm	0.025 to 0.05	0.02 to 0.039	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	00000	00000	00000
62	56	One End	45.5 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
46 mm ID
62	56	Both Ends	46 mm	0.025 to 0.05	0.02 to 0.039	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	00000	00000	00000
62	56	One End	46 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
46.5 mm ID
62	56	Both Ends	46.5 mm	0.025 to 0.05	0.02 to 0.039	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	00000	00000	00000
62	56	One End	46.5 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
47 mm ID
62	56	Both Ends	47 mm	0.025 to 0.05	0.02 to 0.039	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	00000	00000	00000
62	56	One End	47 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
47.5 mm ID
62	56	Both Ends	47.5 mm	0.025 to 0.05	0.02 to 0.039	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	00000	00000	00000
62	56	One End	47.5 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
48 mm ID
62	56	Both Ends	48 mm	0.025 to 0.05	0.02 to 0.039	-0.3 to 0.3	PM	Steel	Rockwell C61	__	000000000	00000	00000	00000
62	56	One End	48 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
70	56	One End	48 mm	0.009 to 0.025	0.059 to 0.078	-0.35 to 0.35	PM	Steel	Rockwell C61	__	000000000	00000	00000	00000
49 mm ID
70	56	One End	49 mm	0.009 to 0.025	0.059 to 0.078	-0.35 to 0.35	PM	Steel	Rockwell C61	__	000000000	00000	00000	00000
50 mm ID
70	56	One End	50 mm	0.009 to 0.025	0.059 to 0.078	-0.35 to 0.35	PM	Steel	Rockwell C61	__	000000000	00000	00000	00000
55 mm ID
70	56	One End	55 mm	0.01 to 0.029	0.059 to 0.078	-0.35 to 0.35	PM	Steel	Rockwell C61	__	000000000	00000	00000	00000

Selecting Compatible Lead Screws and Nuts

Metric Ball Screws and Nuts

Threadless Lead Screw Nuts

Metric Press-Fit Drill Bushings