Square Jam Nuts | McMaster-Carr

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Class 04

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Metric Trapezoidal Class 7H

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EAR99

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46 Products

Medium-Strength Steel Thin-Profile Square Nuts

Made of ISO Class 04 steel and about two-thirds the height of standard steel square nuts, these nuts are suitable for most low-clearance fastening applications. Also known as square jam nuts, they’re commonly jammed together to hold each other in place. Their flat, broad sides make them easy to grip with a wrench and keep them from rotating in channels and square holes. Compared to hex nuts, a greater area is in contact with the fastened surface.

Black-Oxide Steel—Black-oxide steel square nuts have a dark surface color and are mildly corrosion resistant in dry environments.

Zinc-Plated Steel—Zinc-plated steel square nuts resist corrosion in wet environments.

DIN 562—These nuts meet DIN 562, an international standard that signifies their material and dimensions are compatible with other products and tools.

	Wd., mm	Ht., mm	Specs. Met	Pkg. Qty.		Pkg.
Black-Oxide Steel—Class 04



	M3 × 0.5 mm	5.5	1.8	DIN 562	10	97259A111	00000


	M4 × 0.7 mm	7	2.2	DIN 562	10	97259A112	0000


	Zinc-Plated Steel—Class 04



			M3 × 0.5 mm	5.5	1.8	DIN 562	100	97259A101	0000


			M4 × 0.7 mm	7	2.2	DIN 562	100	97259A102	00000
			M5 × 0.8 mm	8	2.7	DIN 562	100	97259A103	0000
			M6 × 1 mm	10	3.2	DIN 562	100	97259A104	00000
			M8 × 1.25 mm	13	4	DIN 562	50	97259A105	00000
			M10 × 1.5 mm	17	5	DIN 562	25	97259A106	00000

18-8 Stainless Steel Thin-Profile Square Nuts

Two-thirds the height of typical square nuts and made of 18-8 stainless steel, these metric nuts are designed for use in low-clearance applications in humid, damp, and washdown environments. They’re often called square jam nuts because they can be jammed together to hold each other in place. They’re easily gripped with a wrench due to their flat, broad sides, which also prevent them from rotating in channels and square holes. Compared to hex nuts, a greater area is in contact with the fastened surface. And compared to steel nuts, they’re slightly less strong.

Black-Oxide 18-8 Stainless Steel—Black-oxide 18-8 stainless steel nuts have a dark surface color.

DIN 562—These nuts meet DIN 562, an international standard that signifies their material and dimensions are compatible with other products and tools.

	Wd., mm	Ht., mm	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel



	M2 × 0.4 mm	4	1.2	DIN 562	25	97258A121	000000


	M2.5 × 0.45 mm	5	1.6	DIN 562	25	97258A122	00000
	M3 × 0.5 mm	5.5	1.8	DIN 562	50	97258A101	0000
	M4 × 0.7 mm	7	2.2	DIN 562	50	97258A102	00000
	M5 × 0.8 mm	8	2.7	DIN 562	50	97258A103	00000
	M6 × 1 mm	10	3.2	DIN 562	50	97258A104	00000
	M8 × 1.25 mm	13	4	DIN 562	25	97258A105	00000
	M10 × 1.5 mm	17	5	DIN 562	10	97258A106	0000


	Black-Oxide 18-8 Stainless Steel



			M3 × 0.5 mm	5.5	1.8	DIN 562	10	97258A123	0000


			M4 × 0.7 mm	7	2.2	DIN 562	10	97258A124	0000

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

Square Nuts—Right-Hand Thread

Square nuts fasten and position lead screw components. Square nuts have large sides, which make them easier to grip with a wrench than hex nuts and keep them from rotating in channels and square holes.

360 Brass—360 brass components have excellent machinability and good 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	Ht., mm	Wd., mm	No. of Thread Starts	Speed Ratio	Travel Distance per Turn, mm	Thread Fit	Hardness	Tensile Strength		Each
360 Brass



	M10 × 2 mm	Metric Trapezoidal	20	19	1	1:1	2	Metric Trapezoidal Class 7H	Not Rated	Not Rated	94353A311	000000


	M12 × 3 mm	Metric Trapezoidal	25	25	1	1:1	3	Metric Trapezoidal Class 7H	Not Rated	Not Rated	94353A312	00000
	M16 × 4 mm	Metric Trapezoidal	35	28	1	1:1	4	Metric Trapezoidal Class 7H	Not Rated	Not Rated	94353A313	00000
	M20 × 4 mm	Metric Trapezoidal	50	38	1	1:1	4	Metric Trapezoidal Class 7H	Not Rated	Not Rated	94353A314	000000

Acme Lead Screws and Nuts

Square Nuts—Right-Hand Thread

360 Brass—360 brass components have excellent machinability and good corrosion resistance.

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

	Thread Type	Ht.	Wd.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness	Tensile Strength	Specs. Met		Each
360 Brass



	3/8"-12	Acme	3/8"	3/4"	1	1:1	0.083"	Acme Class 2G	Rockwell B55	Not Rated	ASTM B16	95270A111	00000


	1/2"-10	Acme	1/2"	7/8"	1	1:1	0.1"	Acme Class 2G	Rockwell B55	Not Rated	ASTM B16	95270A114	00000
	5/8"-8	Acme	5/8"	1"	1	1:1	0.125"	Acme Class 2G	Rockwell B55	Not Rated	ASTM B16	95270A119	00000
	3/4"-5	Acme	3/4"	1 1/4"	1	1:1	0.2"	Acme Class 2G	Rockwell B55	Not Rated	ASTM B16	95270A123	00000
	3/4"-6	Acme	3/4"	1 1/4"	1	1:1	0.167"	Acme Class 2G	Rockwell B55	Not Rated	ASTM B16	95270A127	00000
	7/8"-6	Acme	7/8"	1 1/2"	1	1:1	0.167"	Acme Class 2G	Rockwell B55	Not Rated	ASTM B16	95270A143	00000
	1"-5	Acme	1"	1 5/8"	1	1:1	0.2"	Acme Class 2G	Rockwell B55	Not Rated	ASTM B16	95270A147	00000
	1"-6	Acme	1"	1 5/8"	1	1:1	0.167"	Acme Class 2G	Rockwell B55	Not Rated	ASTM B16	95270A151	00000
	1"-10	Acme	1"	1 5/8"	1	1:1	0.1"	Acme Class 2G	Rockwell B55	Not Rated	ASTM B16	95270A155	00000
	1 1/8"-5	Acme	1 1/8"	1 3/4"	1	1:1	0.2"	Acme Class 2G	Rockwell B55	Not Rated	ASTM B16	95270A159	00000
	1 1/4"-5	Acme	1 1/4"	2"	1	1:1	0.2"	Acme Class 2G	Rockwell B55	Not Rated	ASTM B16	95270A163	00000


	1 1/2"-4	Acme	1 1/2"	2 1/4"	1	1:1	0.25"	Acme Class 2G	Rockwell B55	Not Rated	ASTM B16	95270A167	00000
	2"-4	Acme	2"	3"	1	1:1	0.25"	Acme Class 2G	Rockwell B55	Not Rated	ASTM B16	95270A171	000000

Square Nuts—Left-Hand Thread

360 Brass—360 brass components have excellent machinability and good corrosion resistance.

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

	Thread Type	Ht.	Wd.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness	Tensile Strength	Specs. Met		Each
360 Brass



	3/8"-12	Acme	3/8"	3/4"	1	1:1	0.083"	Acme Class 2G	Rockwell B55	Not Rated	ASTM B16	95270A511	00000


	1/2"-10	Acme	1/2"	7/8"	1	1:1	0.1"	Acme Class 2G	Rockwell B55	Not Rated	ASTM B16	95270A514	00000
	5/8"-8	Acme	5/8"	1"	1	1:1	0.125"	Acme Class 2G	Rockwell B55	Not Rated	ASTM B16	95270A519	00000
	3/4"-5	Acme	3/4"	1 1/4"	1	1:1	0.2"	Acme Class 2G	Rockwell B55	Not Rated	ASTM B16	95270A523	00000
	3/4"-6	Acme	3/4"	1 1/4"	1	1:1	0.167"	Acme Class 2G	Rockwell B55	Not Rated	ASTM B16	95270A527	00000
	7/8"-6	Acme	7/8"	1 1/2"	1	1:1	0.167"	Acme Class 2G	Rockwell B55	Not Rated	ASTM B16	95270A543	00000
	1"-5	Acme	1"	1 5/8"	1	1:1	0.2"	Acme Class 2G	Rockwell B55	Not Rated	ASTM B16	95270A547	00000
	1"-6	Acme	1"	1 5/8"	1	1:1	0.167"	Acme Class 2G	Rockwell B55	Not Rated	ASTM B16	95270A551	00000
	1"-10	Acme	1"	1 5/8"	1	1:1	0.1"	Acme Class 2G	Rockwell B55	Not Rated	ASTM B16	95270A555	00000
	1 1/4"-5	Acme	1 1/4"	2"	1	1:1	0.2"	Acme Class 2G	Rockwell B55	Not Rated	ASTM B16	95270A563	00000
	1 1/2"-4	Acme	1 1/2"	2 1/4"	1	1:1	0.25"	Acme Class 2G	Rockwell B55	Not Rated	ASTM B16	95270A567	00000