1/2"-4 Rods | McMaster-Carr

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	System of Measurement System of Measurement

Inch

	Thread Size Thread Size	Show

1/2"-4

	Thread Size Thread Size	Hide

	Length Length

	Component Component

	Ball Nut
	Ball Screw

	Material Material

Stainless Steel

Steel

	Travel Distance per Turn Travel Distance per Turn

0.5"

	Nut Type Nut Type


Flange	Externally Threaded

	Thread Direction Thread Direction

	Right Hand

	Threading Threading

	Fully Threaded

	Number of Thread Starts Number of Thread Starts

	Root Diameter Root Diameter

0.4"

0.405"

	Diameter Diameter

1 1/16"

	Thread Type Thread Type

Ball

	Minimum Temperature Minimum Temperature

-99° to 0° F

	Maximum Temperature Maximum Temperature

Less than 500° F

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Hardness Hardness

Rockwell C38

Rockwell C56

	Dynamic Thrust Load Capacity Dynamic Thrust Load Capacity

Less than 1,000 lbs.

1,000 to 1,999 lbs.

	Flange Material Flange Material

Steel

Stainless Steel

	Tensile Strength Tensile Strength

85,000 psi

145,000 psi

150,000 psi

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	Maximum Backlash Maximum Backlash

0.007"

0.015"

	External Thread Size External Thread Size

15/16"-16

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10 Products

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., ft.	No. of Thread Starts	Travel Distance per Turn	Accuracy for Travel Distance per Turn	Root Dia.	Hardness	Tensile Strength, psi	Temperature Range, °F		Each
1/2"-4	1	2	0.5"	±0.004" per ft.	0.405"	Rockwell C56	85,000	-40° to 300°	00000000	000000
1/2"-4	2	2	0.5"	±0.004" per ft.	0.405"	Rockwell C56	85,000	-40° to 300°	00000000	000000

Externally Threaded Ball Nuts—Right-Hand Threaded

Secure a way wiper on the end of a ball nut to sweep chips and other contaminants out of the way as it moves across the ball screw.

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
A	1/2"-4	1 3/4"	1"	2	0.5"	15/16"-16	Rockwell C56	1,050	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
C	1/2"-4	1 3/4"	1"	2 19/32"	17/32"	2	0.5"	2 3/32"	Rockwell C56	1,050	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.