3/4"-4 Screws | McMaster-Carr

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Selecting Compatible Lead 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.

Black-oxide alloy steel ball nuts have mild corrosion resistance.

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—Right-Hand Threaded

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

Alloy Steel
Thread Size	Lg.	No. of Thread Starts	Travel Distance per Turn	Accuracy for Travel Distance per Turn	Root Dia.	Hardness	Tensile Strength, psi	Temperature Range, °F		Each
3/4"-4	1ft.	2	0.5"	±0.004" per ft.	0.629"	Rockwell C56	85,000	-40° to 300°	00000000	000000
3/4"-4	2ft.	2	0.5"	±0.004" per ft.	0.629"	Rockwell C56	85,000	-40° to 300°	00000000	000000
3/4"-4	3ft.	2	0.5"	±0.004" per ft.	0.629"	Rockwell C56	85,000	-40° to 300°	00000000	000000
3/4"-4	4ft.	2	0.5"	±0.004" per ft.	0.629"	Rockwell C56	85,000	-40° to 300°	00000000	000000
3/4"-4	5ft.	2	0.5"	±0.004" per ft.	0.629"	Rockwell C56	85,000	-40° to 300°	00000000	000000
3/4"-4	6ft.	2	0.5"	±0.004" per ft.	0.629"	Rockwell C56	85,000	-40° to 300°	00000000	000000

Externally Threaded Ball Nuts—Right-Hand Threaded

Black-Oxide Alloy Steel
	Thread Size	Lg.	Dia.	No. of Thread Starts	Travel Distance per Turn	External Thread Size	Hardness	Dynamic Thrust Load Cap., lbs.	Max. Backlash	Temperature Range, °F		Each
C	3/4"-4	2 15/16"	1 5/16"	2	0.5"	1 1/4"-18	Rockwell C56	3,400	0.015"	-40° to 300°	00000000	0000000

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
Black-Oxide Alloy Steel
F	3/4"-4	2 15/16"	1 5/16"	2 5/8"	17/32"	2	0.5"	2 3/32"	Rockwell C56	3,400	0.015"	-40° to 300°	00000000	0000000

Fast-Travel Corrosion-Resistant Ball Screws and Nuts

Multiple thread channels (also known as thread starts) create faster linear travel than ball screws with a single thread start. Suitable for use in harsh environments, these ball screws and nuts are made of stainless steel. 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. 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.