Grooves on the surface of these shafts transmit rotary power while allowing bearings to move freely along the length of the shaft. The edges are chamfered to remove sharp corners, reducing damage to bearings, housings, and other components during installation. All are turned, ground, and polished to tight diameter and straightness tolerances.

Four Splines

Shafts with four splines work with ball spline bearings, which create relatively little friction. They're commonly found in robotic and other automated systems that require complex, fast movements. They don't transmit as much torque as shafts with six splines.

All four-spline shafts are 52100 alloy steel for high strength. They're case-hardened to increase hardness and wear resistance on the surface of the shaft while allowing the center to remain soft for absorbing stresses caused by shifting loads.

Some of our four-spline shafts have a step-down end, which has been ground smooth and round like a standard shaft. Mount bearings, gears, and other round-bore components.

4 Splines (Metric—52100 Alloy Steel)

Four Splines

					Step
Dia., mm	Dia. Tolerance, mm	Lg., mm	Lg. Tolerance, mm	Spline Lg., mm	Dia., mm	Dia. Tolerance, mm	Lg., mm	Surface Smoothness, microinch	Edge Type	Yield Strength, psi		Each
Splined End × Step-Down End
23	-0.021 to 0	350	-0.7874 to 0.7874	200	20	-0.021 to 0	150	16	Chamfered	128,000	00000000	0000000

Metric Ball Screws and Nuts

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.

Ball Screws with Flange Ball Nut—Right-Hand Threaded

Root diameter indicates the diameter the ball screw will be after machining away the threads.

	Ball Screw			Flange Ball Nut
Thread Size	Lg., mm	Root Dia., mm	Tensile Strength, psi	Lg., mm	Dia., mm	No. of Thread Starts	Travel Distance per Turn, mm	Accuracy for Travel Distance per Turn	Hardness	Dynamic Thrust Load Cap., lbs.	Max. Backlash, mm	Temperature Range, °F		Each
Carbon Steel Ball Screw with Alloy Steel Flange Ball Nut
M10	200	8.6	21,000	28	23	1	2	±0.210 mm per 300 mm	Rockwell C58	510	0.05	5° to 175°	0000000	0000000
M10	300	8.6	21,000	28	23	1	2	±0.210 mm per 300 mm	Rockwell C58	510	0.05	5° to 175°	000000	000000

3 Products

Selecting Compatible Lead Screws and Nuts

About Shafts

Splined Shafts for Rotary and Linear Motion

Metric Ball Screws and Nuts