3/8"-8 Bolts | McMaster-Carr

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83 Products

Selecting Compatible Lead Screws and Nuts

Found in hand-powered clamps, vises, grates, doors, and work tables, lead screws and nuts have broad, square threads that are well suited for quick assembly, high clamping forces, and lifting and lowering heavy objects. To ensure compatibility, please select components that have the same thread direction, thread size, and number of thread starts.

Carbon steel components are easier to machine than alloy steel components. Zinc-plated carbon steel components have mild corrosion resistance. Alloy steel components are harder and stronger than carbon steel components. 18-8 stainless steel components have good corrosion resistance. 316 stainless steel components have excellent corrosion resistance.

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

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

Lead Screws—Right-Hand Threaded

Carbon Steel
Thread Size	Lg.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Fastener Strength Grade/Class	Hardness	Tensile Strength, psi	Specifications Met		Each
3/8"-8	12"	1	1:1	0.125"	Class 2G	Grade 2	Rockwell B61	64,000	ASTM A108	000000000	000000
3/8"-8	3 ft.	1	1:1	0.125"	Class 2G	Grade 2	Rockwell B61	64,000	ASTM A108	000000000	00000
3/8"-8	6 ft.	1	1:1	0.125"	Class 2G	Grade 2	Rockwell B61	64,000	ASTM A108	000000000	00000
Zinc-Plated Carbon Steel
3/8"-8	12"	1	1:1	0.125"	Class 2G	Grade 2	Rockwell B61	68,000	ASTM A108	000000000	00000
3/8"-8	3 ft.	1	1:1	0.125"	Class 2G	Grade 2	Rockwell B61	68,000	ASTM A108	000000000	00000
3/8"-8	6 ft.	1	1:1	0.125"	Class 2G	Grade 2	Rockwell B61	68,000	ASTM A108	000000000	00000
Alloy Steel
3/8"-8	12"	1	1:1	0.125"	Class 2G	ASTM Grade B7	Rockwell C35	125,000	ASTM A193	000000000	00000
3/8"-8	3 ft.	1	1:1	0.125"	Class 2G	ASTM Grade B7	Rockwell C35	125,000	ASTM A193	000000000	00000
3/8"-8	6 ft.	1	1:1	0.125"	Class 2G	ASTM Grade B7	Rockwell C35	125,000	ASTM A193	000000000	000000
18-8 Stainless Steel
3/8"-8	12"	1	1:1	0.125"	Class 2G	__	Rockwell B96	Not Rated	__	000000000	00000
3/8"-8	3 ft.	1	1:1	0.125"	Class 2G	__	Rockwell B96	Not Rated	__	000000000	00000
3/8"-8	6 ft.	1	1:1	0.125"	Class 2G	__	Rockwell B96	Not Rated	__	000000000	000000
316 Stainless Steel
3/8"-8	12"	1	1:1	0.125"	Class 2G	ASTM Grade B8M	Rockwell B97	75,000	ASTM A193	000000000	00000
3/8"-8	3 ft.	1	1:1	0.125"	Class 2G	ASTM Grade B8M	Rockwell B97	75,000	ASTM A193	000000000	00000
3/8"-8	6 ft.	1	1:1	0.125"	Class 2G	ASTM Grade B8M	Rockwell B97	75,000	ASTM A193	000000000	00000

Lead Screws—Left-Hand Threaded

Alloy Steel
Thread Size	Lg.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Fastener Strength Grade/Class	Hardness	Tensile Strength, psi	Specifications Met		Each
3/8"-8	3 ft.	1	1:1	0.125"	Class 2G	ASTM Grade B7	Rockwell C35	125,000	ASTM A193	000000000	000000
3/8"-8	6 ft.	1	1:1	0.125"	Class 2G	ASTM Grade B7	Rockwell C35	125,000	ASTM A193	000000000	00000

Hex Nuts—Right-Hand Threaded

Hex nuts fasten and position lead screw components.

Carbon Steel
Thread Size	Ht.	Wd.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness		Each
3/8"-8	23/64"	11/16"	1	1:1	0.125"	Class 2G	Rockwell B75	000000000	00000
Zinc-Plated Carbon Steel
3/8"-8	23/64"	11/16"	1	1:1	0.125"	Class 2G	Rockwell B75	000000000	00000
18-8 Stainless Steel
3/8"-8	23/64"	11/16"	1	1:1	0.125"	Class 2G	Rockwell B97	000000000	00000

Hex Nuts—Left-Hand Threaded

Hex nuts fasten and position lead screw components.

Carbon Steel
Thread Size	Ht.	Wd.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Fastener Strength Grade/Class	Hardness		Each
3/8"-8	23/64"	11/16"	1	1:1	0.125"	Class 2G	Grade 2	Rockwell B85	000000000	00000
18-8 Stainless Steel
3/8"-8	23/64"	11/16"	1	1:1	0.125"	Class 2G	__	Rockwell B97	000000000	00000

Fast-Travel Ultra-Precision Lead Screws and Nuts

Multiple thread channels (also known as thread starts) create faster linear travel than lead screws with a single thread start. Operating with less backlash (play) than Precision Acme Lead Screws and Nuts, these lead screws and nuts provide increased nut life and more reliable movement in automated systems. All components are corrosion resistant for use in harsh environments. To ensure compatibility, select components that have the same thread type, thread size, and number of thread starts.

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

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

Lead Screws—Right-Hand Threaded

303 Stainless Steel
Thread Size	Lg.	No. of Thread Starts	Thread Type	Speed Ratio	Travel Distance per Turn	Accuracy for Travel Distance per Turn	Hardness	Tensile Strength, psi		Each
3/8"-8	3ft.	2	Rounded Acme	2:1	0.25"	±0.0006" per in.	Brinell 160	90,000	00000000	0000000
3/8"-8	3ft.	4	Rounded Acme	4:1	0.5"	±0.0006" per in.	Brinell 160	90,000	00000000	000000
3/8"-8	6ft.	4	Rounded Acme	4:1	0.5"	±0.0006" per in.	Brinell 160	90,000	0000000	000000

Flange Nuts—Right-Hand Threaded

Flange nuts with wear-compensating internal O-ring or wear-compensating spring maintain a tight fit even when their threads begin to wear. They resist backlash to maintain accuracy over time, which is important in applications such as 3D printing and robotics.

				Flange
	Thread Size	Lg.	Dia.	Dia.	Thick.	No. of Thread Starts	Thread Type	Speed Ratio	Travel Distance per Turn	Bolt Circle Dia.	Tensile Strength, psi	Dynamic Thrust Load Cap., lbs.		Each
Acetal Plastic
B	3/8"-8	1"	0.625"	1 7/64"	3/16"	4	Rounded Acme	4:1	0.5"	7/8"	9,700	75	0000000	000000
Acetal Plastic with Wear-Compensating Spring
C	3/8"-8	1 29/32"	0.703"	1 1/2"	3/16"	4	Rounded Acme	4:1	0.5"	1 1/8"	9,700	10	0000000	00000

Precision Acme Lead Screws and Nuts

Pair with a motor in automated motion and positioning applications. A tight thread fit allows these lead screws and nuts to make accurate, repeatable starts and stops. Also known as single-start and self-locking lead screws and nuts, they have a single thread that runs the length of the screw. The nut travels only when the screw turns, so your system won’t unexpectedly move when the lead screw is at rest. To ensure compatibility, please select components that have the same thread direction, thread size, and number of thread starts.

Carbon steel lead screws and flanges have good machinability. Black-oxide alloy steel lead screws are hard and strong. They have mild corrosion resistance and a dark surface color. 303 and 304 stainless steel lead screws and flanges have good corrosion resistance.

932 bearing bronze and 673 bronze nuts are wear resistant. They have good machinability and fair corrosion resistance. Cast iron nuts have good machinability and high strength. PET plastic nuts are lightweight and corrosion resistant.

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

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

Lead Screws—Right-Hand Threaded

Right-Hand Threads

1018 Carbon Steel
Thread Size	Lg.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Accuracy for Travel Distance per Turn	Thread Fit	Hardness	Tensile Strength, psi		Each
3/8"-8	3 ft.	1	1:1	0.125"	±0.009" per ft.	Class 2C	Brinell 126	64,000	000000000	000000
3/8"-8	6 ft.	1	1:1	0.125"	±0.009" per ft.	Class 2C	Brinell 126	64,000	000000000	00000
Black-Oxide 4140 Alloy Steel
3/8"-8	3 ft.	1	1:1	0.125"	±0.009" per ft.	Class 2C	Brinell 271	125,000	000000000	00000
3/8"-8	6 ft.	1	1:1	0.125"	±0.009" per ft.	Class 2C	Brinell 271	125,000	000000000	00000
304 Stainless Steel
3/8"-8	3 ft.	1	1:1	0.125"	±0.009" per ft.	Class 2C	Brinell 150	72,000	000000000	00000
3/8"-8	6 ft.	1	1:1	0.125"	±0.009" per ft.	Class 2C	Brinell 150	72,000	000000000	00000

Lead Screws—Left-Hand Threaded

Left-Hand Threads

304 Stainless Steel
Thread Size	Lg.	Lg., ft.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Accuracy for Travel Distance per Turn	Thread Fit	Hardness	Tensile Strength, psi		Each
3/8"-8	3 ft.	3	1	1:1	0.125"	±0.009" per ft.	Class 2C	Brinell 150	72,000	000000000	000000
3/8"-8	6 ft.	6	1	1:1	0.125"	±0.009" per ft.	Class 2C	Brinell 150	72,000	000000000	000000

Round Nuts—Right-Hand Threaded

Cast Iron
Thread Size	Lg.	Dia.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness	Dynamic Thrust Load Cap., lbs.	Temperature Range, °F		Each
3/8"-8	3/4"	1.344"	1	1:1	0.125"	Class 2C	Brinell 217	Not Rated	__	000000000	000000
932 Bearing Bronze
3/8"-8	3/4"	1.344"	1	1:1	0.125"	Class 2C	Brinell 65	700	__	00000000	00000
PET Plastic
3/8"-8	3/4"	1.344"	1	1:1	0.125"	Class 2C	Not Rated	350	15° to 175°	00000000	00000

Round Nuts—Left-Hand Threaded

Cast Iron
Thread Size	Lg.	Dia.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness	Dynamic Thrust Load Cap., lbs.	Temperature Range, °F		Each
3/8"-8	3/4"	1.344"	1	1:1	0.125"	Class 2C	Brinell 217	Not Rated	__	000000000	000000
932 Bearing Bronze
3/8"-8	3/4"	1.344"	1	1:1	0.125"	Class 2C	Brinell 65	700	__	00000000	00000
PET Plastic
3/8"-8	3/4"	1.344"	1	1:1	0.125"	Class 2C	Not Rated	350	15° to 175°	00000000	00000

Externally Threaded Nuts—Right-Hand Threaded

Combine externally threaded nuts with a flange to create a custom flange nut.

						External Thread
Thread Size	Lg.	Dia.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Size	Lg.	Thread Fit	Hardness	Dynamic Thrust Load Cap., lbs.	Temperature Range, °F		Each
673 Bronze
3/8"-8	5/8"	0.688"	1	1:1	0.125"	9/16"-18	3/8"	Class 2C	Brinell 70	Not Rated	__	000000000	000000
PET Plastic
3/8"-8	5/8"	0.688"	1	1:1	0.125"	9/16"-18	3/8"	Class 2C	Not Rated	350	15° to 175°	000000000	00000

Flanges

Thread onto an externally threaded acme nut to create a custom flange nut.

Carbon steel flanges have good machinability. However, they will rust when exposed to moisture. Black-oxide carbon steel flanges have mild corrosion resistance in dry environments and a dark surface color. 303 stainless steel flanges have good corrosion resistance.

Black-Oxide 1117 Carbon Steel
Flange Thread Size	Flange Dia.	Flange Thick.	Bolt Circle Dia.	Flange Hardness		Each
9/16"-18	1 39/64"	13/32"	1 1/8"	Brinell 135	00000000	000000
1215 Carbon Steel
9/16"-18	1 39/64"	13/32"	1 1/8"	Not Rated	000000000	00000
303 Stainless Steel
9/16"-18	1 39/64"	13/32"	1 1/8"	Brinell 140	0000000	00000

Fast-Travel Precision Acme Lead Screws and Nuts

Multiple thread channels (also known as thread starts) create faster linear travel than lead screws with a single thread start. The threads have a tight thread fit for accurate, repeatable starts and stops. Pair with a motor in automated motion and positioning applications. To ensure compatibility, please select components that have the same thread direction, thread size, and number of thread starts.

Carbon steel lead screws and flanges have good machinability. Black-oxide alloy steel lead screws are hard and strong. They have mild corrosion resistance. 303 and 304 stainless steel lead screws and flanges have good corrosion resistance.

Cast iron nuts have good machinability and high strength. 932 bearing bronze and 673 bronze nuts are wear resistant. They have good machinability and fair corrosion resistance. PET plastic nuts are lightweight and corrosion resistant.

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

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

Lead Screws—Right-Hand Threaded

1018 Carbon Steel
Thread Size	Lg.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Accuracy for Travel Distance per Turn	Thread Fit	Hardness	Tensile Strength, psi		Each
3/8"-8	18"	2	2:1	0.25"	±0.009" per ft.	Class 2C	Not Rated	Not Rated	000000000	000000
3/8"-8	18"	4	4:1	0.5"	±0.009" per ft.	Class 2C	Not Rated	Not Rated	000000000	00000
3/8"-8	3 ft.	2	2:1	0.25"	±0.009" per ft.	Class 2C	Brinell 126	64,000	000000000	00000
3/8"-8	3 ft.	4	4:1	0.5"	±0.009" per ft.	Class 2C	Brinell 126	64,000	000000000	00000
3/8"-8	6 ft.	2	2:1	0.25"	±0.009" per ft.	Class 2C	Brinell 126	64,000	000000000	00000
3/8"-8	6 ft.	4	4:1	0.5"	±0.009" per ft.	Class 2C	Brinell 126	64,000	000000000	00000
Black-Oxide 4140 Alloy Steel
3/8"-8	3 ft.	2	2:1	0.25"	±0.009" per ft.	Class 2C	Brinell 271	125,000	000000000	00000
3/8"-8	3 ft.	4	4:1	0.5"	±0.009" per ft.	Class 2C	Brinell 271	125,000	000000000	00000
3/8"-8	6 ft.	2	2:1	0.25"	±0.009" per ft.	Class 2C	Brinell 271	125,000	000000000	000000
3/8"-8	6 ft.	4	4:1	0.5"	±0.009" per ft.	Class 2C	Brinell 271	125,000	000000000	000000
304 Stainless Steel
3/8"-8	18"	2	2:1	0.25"	±0.009" per ft.	Class 2C	Not Rated	Not Rated	000000000	00000
3/8"-8	18"	4	4:1	0.5"	±0.009" per ft.	Class 2C	Not Rated	Not Rated	000000000	00000
3/8"-8	3 ft.	2	2:1	0.25"	±0.009" per ft.	Class 2C	Not Rated	Not Rated	000000000	00000
3/8"-8	3 ft.	4	4:1	0.5"	±0.009" per ft.	Class 2C	Not Rated	Not Rated	000000000	00000
3/8"-8	6 ft.	2	2:1	0.25"	±0.009" per ft.	Class 2C	Brinell 150	72,000	000000000	00000
3/8"-8	6 ft.	4	4:1	0.5"	±0.009" per ft.	Class 2C	Brinell 150	72,000	000000000	000000

Round Nuts—Right-Hand Threaded

Cast Iron
Thread Size	Lg.	Dia.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness	Dynamic Thrust Load Cap., lbs.	Temperature Range, °F		Each
3/8"-8	3/4"	1.344"	2	2:1	0.25"	Class 2C	Brinell 217	Not Rated	__	000000000	000000
3/8"-8	3/4"	1.344"	4	4:1	0.5"	Class 2C	Brinell 217	Not Rated	__	000000000	00000
932 Bearing Bronze
3/8"-8	3/4"	1.344"	2	2:1	0.25"	Class 2C	Brinell 65	700	__	00000000	00000
3/8"-8	3/4"	1.344"	4	4:1	0.5"	Class 2C	Brinell 65	700	__	00000000	00000
PET Plastic
3/8"-8	3/4"	1.344"	2	2:1	0.25"	Class 2C	Not Rated	350	15° to 175°	00000000	00000
3/8"-8	3/4"	1.344"	4	4:1	0.5"	Class 2C	Not Rated	350	15° to 175°	00000000	00000

Round Nuts—Left-Hand Threaded

932 Bearing Bronze
Thread Size	Lg.	Dia.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness	Dynamic Thrust Load Cap., lbs.		Each
3/8"-8	3/4"	1.344"	2	2:1	0.25"	Class 2C	Brinell 65	700	00000000	000000
3/8"-8	3/4"	1.344"	4	4:1	0.5"	Class 2C	Brinell 65	700	00000000	00000

Externally Threaded Nuts—Right-Hand Threaded

Combine externally threaded nuts with a flange to create a custom flange nut.

						External Thread
Thread Size	Lg.	Dia.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Size	Lg.	Thread Fit	Hardness	Dynamic Thrust Load Cap., lbs.	Temperature Range, °F		Each
673 Bronze
3/8"-8	5/8"	0.688"	2	2:1	0.25"	9/16"-18	3/8"	Class 2C	Brinell 70	Not Rated	__	000000000	000000
3/8"-8	5/8"	0.688"	4	4:1	0.5"	9/16"-18	3/8"	Class 2C	Brinell 70	Not Rated	__	000000000	00000
PET Plastic
3/8"-8	5/8"	0.688"	2	2:1	0.25"	9/16"-18	3/8"	Class 2C	Not Rated	350	15° to 175°	000000000	00000
3/8"-8	5/8"	0.688"	4	4:1	0.5"	9/16"-18	3/8"	Class 2C	Not Rated	350	15° to 175°	000000000	00000

Flanges

Thread onto an externally threaded acme nut to create a custom flange nut.

1215 Carbon Steel
Flange Thread Size	Flange Dia.	Flange Thick.	Bolt Circle Dia.	Flange Hardness		Each
9/16"-18	1 39/64"	13/32"	1 1/8"	Not Rated	000000000	000000
303 Stainless Steel
9/16"-18	1 39/64"	13/32"	1 1/8"	Brinell 140	0000000	00000

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, they 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 direction and 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.

Black-oxide alloy steel ball screws and 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	Temp. Range, °F		Each
3/8"-8	1 ft.	1	0.125"	±0.004" per ft.	0.31"	Rockwell C56	85,000	-40° to 300°	00000000	000000
3/8"-8	2 ft.	1	0.125"	±0.004" per ft.	0.31"	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	Temp. Range, °F		Each
A	3/8"-8	1 11/64"	3/4"	1	0.125"	11/16"-28	Rockwell C56	150	0.015"	-40° to 300°	00000000	000000

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		Each
Black-Oxide Alloy Steel
D	3/8"-8	1"	3/4"	1 39/64"	11/32"	1	0.125"	1 15/64"	Rockwell C56	130	0.015"	00000000	0000000

Corrosion-Resistant Ball Screws and Nuts

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. Also known as single-start ball screws and nuts, they 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. 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—Right-Hand Threaded

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

17-4 PH Stainless 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
3/8"-8	1	1	0.125"	±0.005" per ft.	0.3"	Rockwell C38	150,000	-65° to 300°	0000000	0000000
3/8"-8	2	1	0.125"	±0.004" per ft.	0.3"	Rockwell C38	145,000	-65° to 300°	000000	000000
3/8"-8	4	1	0.125"	±0.004" per ft.	0.3"	Rockwell C38	145,000	-65° to 300°	000000	000000

Externally Threaded Ball Nuts—Right-Hand Threaded

17-4 PH Stainless 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	3/8"-8	1"	3/4"	1	0.125"	0.664"-32	Rockwell C38	25	0.007"	-65° to 300°	000000	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
17-4 PH Stainless Steel
C	3/8"-8	1"	3/4"	1 19/32"	17/64"	1	0.125"	1 15/64"	Rockwell C38	25	0.007"	-65° to 300°	0000000	0000000