External Square Jam Nuts

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18 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—ISO Class 04



	M3 × 0.5 mm	5.5	1.8	DIN 562	10	000000000	00000


	M4 × 0.7 mm	7	2.2	DIN 562	10	000000000	0000


	Zinc-Plated Steel—ISO Class 04



			M3 × 0.5 mm	5.5	1.8	DIN 562	100	000000000	0000


			M4 × 0.7 mm	7	2.2	DIN 562	100	000000000	00000
			M5 × 0.8 mm	8	2.7	DIN 562	100	000000000	0000
			M6 × 1 mm	10	3.2	DIN 562	100	000000000	00000
			M8 × 1.25 mm	13	4	DIN 562	50	000000000	00000
			M10 × 1.5 mm	17	5	DIN 562	25	000000000	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	000000000	000000


	M2.5 × 0.45 mm	5	1.6	DIN 562	25	000000000	00000
	M3 × 0.5 mm	5.5	1.8	DIN 562	50	000000000	0000
	M4 × 0.7 mm	7	2.2	DIN 562	50	000000000	00000
	M5 × 0.8 mm	8	2.7	DIN 562	50	000000000	00000
	M6 × 1 mm	10	3.2	DIN 562	50	000000000	00000
	M8 × 1.25 mm	13	4	DIN 562	25	000000000	00000
	M10 × 1.5 mm	17	5	DIN 562	10	000000000	0000


	Black-Oxide 18-8 Stainless Steel



			M3 × 0.5 mm	5.5	1.8	DIN 562	10	000000000	0000


			M4 × 0.7 mm	7	2.2	DIN 562	10	000000000	0000