M40 Bolts | McMaster-Carr

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, size, and number of thread starts. Class 7e and 7H components are compatible.

Lead Screws—Right-Hand Thread

Black-Oxide Carbon Steel—Black-oxide carbon steel components have mild corrosion resistance.

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

	Thread Type	Lg., mm	No. of Thread Starts	Speed Ratio	Travel Distance per Turn, mm	Thread Fit	Fastener Strength Grade/Class	Hardness	Tensile Strength	Specs. Met		Each
Black-Oxide Carbon Steel



	M40 × 7 mm	Metric Trapezoidal	1,000	1	1:1	7	Metric Trapezoidal Class 7e	SAE Grade 2	Not Rated	Not Rated	ASTM A108, ASTM A193, DIN 103	97048A747	0000000


	M40 × 7 mm	Metric Trapezoidal	2,000	1	1:1	7	Metric Trapezoidal Class 7e	SAE Grade 2	Rockwell B72	Not Rated	ASTM A108	97048A739	000000

Flange Nuts—Right-Hand Thread

Flange nuts move objects along the length of a lead screw. They have a wide machinable flange for custom mounting.

932 Bearing Bronze—932 bearing bronze components are more wear resistant than brass components. They have good machinability and fair corrosion resistance.

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

					Flange, mm
	Thread Size	Thread Type	Ht., mm	Dia., mm	Dia.	Thk.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn, mm	Thread Fit	Hardness	Tensile Strength		Each
932 Bearing Bronze



		M40 × 7 mm	Metric Trapezoidal	66	63	98	16	1	1:1	7	Metric Trapezoidal Class 7H	Not Rated	Not Rated	94353A326	0000000

Hex Nuts—Right-Hand Thread

Hex nuts fasten and position lead screw components.

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

	Thread Type	Ht., mm	Wd., mm	No. of Thread Starts	Speed Ratio	Travel Distance per Turn, mm	Thread Fit	Fastener Strength Grade/Class	Hardness	Tensile Strength		Each
Carbon Steel



	M40 × 7 mm	Metric Trapezoidal	39.9	60.33	1	1:1	7	Metric Trapezoidal Class 7H	SAE Grade 2	Not Rated	Not Rated	94353A400	000000

Metric Precision 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, select components that have the same thread direction, size, and number of thread starts.

Lead Screws—Right-Hand Thread

1018 Low-Carbon Steel—Carbon steel lead screws and flanges have good machinability.

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

	Lg., mm	Thread Type	Speed Ratio	No. of Thread Starts	Travel Distance per Turn, mm	Accuracy for Travel Distance per Turn	Thread Fit	Hardness	Tensile Strength, psi	Specs. Met		Each
1018 Low-Carbon Steel



	M40 × 7 mm	1,000	Metric Trapezoidal	1:1	1	7	±0.15 mm/300 mm	Metric Trapezoidal Class 8e	Brinell 150	85,000	DIN 103	7549K85	0000000


	M40 × 7 mm	1,750	Metric Trapezoidal	1:1	1	7	±0.15 mm/300 mm	Metric Trapezoidal Class 8e	Brinell 150	70,000	DIN 103	7549K12	000000

Round Nuts—Right-Hand Thread

932 Bearing Bronze—932 bearing bronze and 673 bronze nuts are wear resistant. They have good machinability and fair corrosion resistance.

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

	Lg.	Dia.	Thread Type	Speed Ratio	No. of Thread Starts	Travel Distance per Turn, mm	Thread Fit	Hardness	Tensile Strength	Dynamic Thrust Load Cap., lb.	Specs. Met		Each
932 Bearing Bronze



	M40 × 7 mm	3"	2.5"	Metric Trapezoidal	1:1	1	7	Metric Trapezoidal Class 7H	Brinell 70	Not Rated	12,300	DIN 103	7549K43	000000

Externally Threaded Nuts—Right-Hand Thread

Image of Product. Front orientation. Contains Annotated. Precision Lead Screws and Nuts. Metric Precision Lead Screws and Nuts, Externally Threaded Nuts—Right-Hand Thread.

Manganese Bronze—Manganese bronze nuts have good strength and wear resistance.

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

								External Thread
	Thread Size	Lg.	Dia.	Thread Type	Speed Ratio	No. of Thread Starts	Travel Distance per Turn, mm	Size	Lg.	Thread Fit	Hardness	Tensile Strength, psi	Dynamic Thrust Load Cap., lb.	Specs. Met		Each
Manganese Bronze



		M40 × 7 mm	2 19/64"	2.125"	Metric Trapezoidal	1:1	1	7	1 31/32"-18	13/16"	Metric Trapezoidal Class 7H	Brinell 126	75,000	12,300	DIN 103	7549K95	0000000

Flange Nuts—Right-Hand Thread

Manganese Bronze—Manganese bronze nuts have good strength and wear resistance.

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

				Flange
	Thread Size	Lg.	Dia.	Dia.	Thk.	Thread Type	Speed Ratio	Bolt Circle Dia.	No. of Thread Starts	Travel Distance per Turn, mm	Thread Fit	Hardness	Tensile Strength	Dynamic Thrust Load Cap., lb.	No. of Mounting Holes	Specs. Met		Each
Manganese Bronze



		M40 × 7 mm	2 19/64"	2.125"	4 13/64"	53/64"	Metric Trapezoidal	1:1	3 7/16"	1	7	Metric Trapezoidal Class 7H	Brinell 126	Not Rated	12,300	4	DIN 103	7549K27	0000000

Fast-Travel Ball Screws and Nuts


	Flange Nut Ball Nuts Style E

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.

Ball Screws—Right-Hand Threaded

Carbon Steel—Carbon steel ball screws and nuts are case hardened, so they resist wear better than standard carbon steel. However, they are less corrosion resistant than black-oxide alloy steel screws and nuts.

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

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

	Lg., mm	No. of Thread Starts	Travel Distance per Turn, mm	Accuracy for Travel Distance per Turn	Root Dia., mm	Hardness	Tensile Strength, psi	Temp. Range, ° F		Each
Carbon Steel



	M40	500	4	40	±0.05 mm/300 mm	35.4	Rockwell C56	95,000	32 to 150	4566N201	0000000


	M40	1,000	4	40	±0.05 mm/300 mm	35.4	Rockwell C56	95,000	32 to 150	4566N202	000000

Flange Ball Nuts—Right-Hand Threaded

Style E

Image of Attribute. Front orientation. Contains Annotated. Fast-Travel Ball Screws and Nuts.

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

					Flange, mm
	Style	Thread Size	Lg., mm	Dia., mm	Dia.	Thk.	No. of Thread Starts	Travel Distance per Turn, mm	Bolt Circle Dia., mm	Hardness	Dynamic Thrust Load Cap., lb.	Max. Backlash, mm	Temp. Range, ° F		Each
Carbon Steel



		E	M40	101	66	106	18	4	40	85	Rockwell C56	9,550	0.07	32 to 150	4566N407	0000000

Spanner Sockets


Socket Shown With Wrench (Sold Separately)

4-Pin

For easy tightening and loosening, these sockets have pins that grip the slotted sides on bearing nuts. These sockets require less clearance around bearings than standard hook spanner wrenches, so they’re good in tight spaces. Use them with a square-drive wrench handle or a ratchet wrench; they’re not for use with impact wrenches.

	For Nut Thread Size	For Bearing Nut Specs. Met	For Nut Dia., mm	Bolt Clearance Dp., mm	Material		Each
4-Pin Socket







	1/2" Square Drive

	58	90	74	M40	ISO 2982-2	58	57	Steel	5510N156	0000000

Threaded Air-Powered Hold-Down Fixture Clamps for Welding


Rubber Holding Screw Tip	Clamping Arm Adapter

Screw these clamps directly into a tapped hole and use air pressure to quickly and consistently clamp and release parts when welding. Compact and lightweight, these clamps are easy to move and reposition when welding. They’re also known as swing clamps. Connect these clamps to a control valve and air line. When pressure is applied, the arm on these clamps rotates 90° into position over your workpiece before clamping down. When pressure is released, the arm rises and rotates out of the way, so you can load or unload parts.

Rubber Holding Screw Tip—Clamps with a rubber-tipped holding screw are nonmarring. Their tip is removable.

Replacement Arms—Replacement arms (sold separately) do not include a holding screw. Extended arms (sold separately) give your clamp a longer reach than standard arms. However, you’ll have to use lower pressure, which means the actual clamping force will be lower than the clamp’s listed rating.

Arm Adapters—Add an arm adapter to mount your own custom-machined arm.

Clamps																Replacement Arms		Arm Adapters
					Body				Holding Screw		Female Air Inlet and Outlet
Max. Clamping Clearance	Vert. Travel During Rotation	Max. Clamping Stroke	Holding Cap., lb.	Reach Lg.	Thread Size	Thread Lg.	Sensor Ready	Overall Ht.	Thread Size	Tip Material	Thread Size	Thread Type	Material		Each		Each		Each







			90° Clockwise Rotation

			4"	1 3/32"	17/32"	35	1 15/16"	M40 × 1.5 mm	1 11/16"	Not Sensor Ready	4 5/8"	M6 × 1 mm	Rubber	M5 × 0.8 mm	Metric	Aluminum	9986N11	0000000	9986N17	000000	9986N18	000000




					90° Counterclockwise Rotation

					4"	1 3/32"	17/32"	35	1 15/16"	M40 × 1.5 mm	1 11/16"	Not Sensor Ready	4 5/8"	M6 × 1 mm	Rubber	M5 × 0.8 mm	Metric	Aluminum	9986N13	000000	9986N17	00000	9986N18	00000