DIN 439B Nuts | McMaster-Carr

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Thin-Profile Hex Nuts

About half the height of standard-profile nuts, these fit in spaces with low clearance. You can also use them as jam nuts by threading them against another hex nut to hold it in place.

Medium-Strength Steel

These Grade 5 or Class 04 nuts are your go-to for fastening most machinery and equipment. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

Zinc-Yellow-Chromate-Plated Steel—With a more durable finish than clear zinc plating, these nuts are suitable for most wet and outdoor environments. However, they won't hold up to the harsh chemicals that stainless steel can.

Steel—Best for dry environments since moisture will cause these nuts to rust.

Blue Dyed Steel—These metric-sized nuts have a distinctive blue color, so you can easily tell them apart from inch nuts.

	Thread Size	Wd., mm	Ht., mm	Fastener Strength Grade/Class	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel


		M2 × 0.4 mm	4	1.2	ISO Class 04	DIN 439B, ISO 4035	100	000000000	00000
		M2.5 × 0.45 mm	5	1.6	ISO Class 04	DIN 439B, ISO 4035	100	000000000	0000
		M3 × 0.5 mm	5.5	1.8	ISO Class 04	DIN 439B, ISO 4035	100	000000000	0000
		M3.5 × 0.6 mm	6	2	ISO Class 04	DIN 439B, ISO 4035	100	000000000	00000
		M4 × 0.7 mm	7	2.2	ISO Class 04	DIN 439B, ISO 4035	100	000000000	0000
		M5 × 0.5 mm	8	2.7	ISO Class 04	DIN 439B, ISO 4035	25	000000000	00000
		M5 × 0.8 mm	8	2.7	ISO Class 04	DIN 439B, ISO 4035	100	000000000	0000
		M6 × 0.75 mm	10	3.2	ISO Class 04	DIN 439B, ISO 4035	25	000000000	00000
		M6 × 1 mm	10	3.2	ISO Class 04	DIN 439B, ISO 4035	100	000000000	0000
		M7 × 1 mm	11	3.5	ISO Class 04	DIN 439B, ISO 4035	100	000000000	00000
		M8 × 1 mm	13	4	ISO Class 04	DIN 439B, ISO 4035	100	000000000	0000
		M8 × 1.25 mm	13	4	ISO Class 04	DIN 439B, ISO 4035	100	000000000	0000
		M10 × 1 mm	17	5	ISO Class 04	DIN 439B, ISO 4035	100	000000000	00000
		M10 × 1.25 mm	17	5	ISO Class 04	DIN 439B, ISO 4035	100	000000000	00000
		M10 × 1.5 mm	17	5	ISO Class 04	DIN 439B, ISO 4035	100	000000000	00000
		M12 × 1 mm	19	6	ISO Class 04	DIN 439B, ISO 4035	25	000000000	0000
		M12 × 1.25 mm	19	6	ISO Class 04	DIN 439B, ISO 4035	50	000000000	0000
		M12 × 1.5 mm	19	6	ISO Class 04	DIN 439B, ISO 4035	25	000000000	0000
		M12 × 1.75 mm	19	6	ISO Class 04	DIN 439B, ISO 4035	50	000000000	00000
		M14 × 1.25 mm	22	7	ISO Class 04	DIN 439B, ISO 4035	10	000000000	00000
		M14 × 1.5 mm	22	7	ISO Class 04	DIN 439B, ISO 4035	25	000000000	0000
		M14 × 2 mm	22	7	ISO Class 04	DIN 439B, ISO 4035	25	000000000	00000
		M16 × 1 mm	24	8	ISO Class 04	DIN 439B, ISO 4035	5	000000000	00000
		M16 × 1.5 mm	24	8	ISO Class 04	DIN 439B, ISO 4035	10	000000000	0000
		M16 × 2 mm	24	8	ISO Class 04	DIN 439B, ISO 4035	25	000000000	00000
		M18 × 1.5 mm	27	9	ISO Class 04	DIN 439B, ISO 4035	10	000000000	0000
		M18 × 2.5 mm	27	9	ISO Class 04	DIN 439B, ISO 4035	10	000000000	0000
		M20 × 1.5 mm	30	10	ISO Class 04	DIN 439B, ISO 4035	10	000000000	0000
		M20 × 2.5 mm	30	10	ISO Class 04	DIN 439B, ISO 4035	10	000000000	00000
		M22 × 1.5 mm	32	11	ISO Class 04	DIN 439B, ISO 4035	10	000000000	00000
		M22 × 2.5 mm	32	11	ISO Class 04	DIN 439B, ISO 4035	1	000000000	0000
		M24 × 1.5 mm	36	12	ISO Class 04	DIN 439B, ISO 4035	5	000000000	00000
		M24 × 2 mm	36	12	ISO Class 04	DIN 439B, ISO 4035	5	000000000	00000
		M24 × 3 mm	36	12	ISO Class 04	DIN 439B, ISO 4035	5	000000000	00000
		M27 × 2 mm	41	13.5	ISO Class 04	DIN 439B, ISO 4035	1	000000000	0000
		M27 × 3 mm	41	13.5	ISO Class 04	DIN 439B, ISO 4035	5	000000000	00000
		M30 × 2 mm	46	15	ISO Class 04	DIN 439B, ISO 4035	1	000000000	0000
		M30 × 3.5 mm	46	15	ISO Class 04	DIN 439B, ISO 4035	1	000000000	0000
		M36 × 3 mm	55	18	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000
		M36 × 4 mm	55	18	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000
		M42 × 4.5 mm	65	21	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000
		M48 × 5 mm	75	24	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000

		Zinc-Yellow-Chromate-Plated Steel


				M4 × 0.7 mm	7	2.2	ISO Class 04	DIN 439B, ISO 4035	100	000000000	0000
				M5 × 0.8 mm	8	2.7	ISO Class 04	DIN 439B, ISO 4035	100	000000000	0000
				M6 × 1 mm	10	3.2	ISO Class 04	DIN 439B, ISO 4035	100	000000000	0000
				M8 × 1 mm	13	4	ISO Class 04	DIN 439B, ISO 4035	25	000000000	00000
				M8 × 1.25 mm	13	4	ISO Class 04	DIN 439B, ISO 4035	100	000000000	00000
				M10 × 1.25 mm	17	5	ISO Class 04	DIN 439B, ISO 4035	25	000000000	0000
				M10 × 1.5 mm	17	5	ISO Class 04	DIN 439B, ISO 4035	50	000000000	00000
				M12 × 1.5 mm	19	6	ISO Class 04	DIN 439B, ISO 4035	25	000000000	0000
				M12 × 1.75 mm	19	6	ISO Class 04	DIN 439B, ISO 4035	50	000000000	00000
				M14 × 1.5 mm	22	7	ISO Class 04	DIN 439B, ISO 4035	25	000000000	0000
				M14 × 2 mm	22	7	ISO Class 04	DIN 439B, ISO 4035	10	000000000	0000
				M16 × 1.5 mm	24	8	ISO Class 04	DIN 439B, ISO 4035	10	000000000	0000
				M16 × 2 mm	24	8	ISO Class 04	DIN 439B, ISO 4035	25	000000000	00000
				M18 × 1.5 mm	27	9	ISO Class 04	DIN 439B, ISO 4035	5	000000000	0000
				M20 × 1.5 mm	30	10	ISO Class 04	DIN 439B, ISO 4035	10	000000000	0000
				M20 × 2.5 mm	30	10	ISO Class 04	DIN 439B, ISO 4035	10	000000000	00000
M22 × 1.5 mm				32	11	ISO Class 04	DIN 439B, ISO 4035	5	000000000	0000
M30 × 2 mm	46			15	ISO Class 04	DIN 439B, ISO 4035	1	000000000	0000

Steel


				M2 × 0.4 mm	4	1.2	—	DIN 439B, ISO 4035	100	000000000	0000
				M2.5 × 0.45 mm	5	1.6	—	DIN 439B, ISO 4035	100	000000000	0000
				M3 × 0.5 mm	5.5	1.8	—	DIN 439B, ISO 4035	100	000000000	0000
				M4 × 0.7 mm	7	2.2	ISO Class 04	DIN 439B, ISO 4035	100	000000000	0000
				M5 × 0.8 mm	8	2.7	ISO Class 04	DIN 439B, ISO 4035	100	000000000	0000
				M6 × 1 mm	10	3.2	ISO Class 04	DIN 439B, ISO 4035	100	000000000	0000
				M8 × 1 mm	13	4	ISO Class 04	DIN 439B, ISO 4035	50	000000000	00000
				M8 × 1.25 mm	13	4	ISO Class 04	DIN 439B, ISO 4035	100	000000000	0000
				M10 × 1.25 mm	17	5	ISO Class 04	DIN 439B, ISO 4035	50	000000000	00000
				M10 × 1.5 mm	17	5	ISO Class 04	DIN 439B, ISO 4035	100	000000000	00000
				M12 × 1.5 mm	19	6	ISO Class 04	DIN 439B, ISO 4035	25	000000000	00000
				M12 × 1.75 mm	19	6	ISO Class 04	DIN 439B, ISO 4035	50	000000000	0000
				M14 × 1.5 mm	22	7	ISO Class 04	DIN 439B, ISO 4035	50	000000000	00000
				M14 × 2 mm	22	7	—	DIN 439B, ISO 4035	10	000000000	0000
				M16 × 1.5 mm	24	8	ISO Class 04	DIN 439B, ISO 4035	25	000000000	00000
				M16 × 2 mm	24	8	ISO Class 04	DIN 439B, ISO 4035	25	000000000	0000
				M18 × 1.5 mm	27	9	ISO Class 04	DIN 439B, ISO 4035	10	000000000	0000
				M20 × 1.5 mm	30	10	ISO Class 04	DIN 439B, ISO 4035	10	000000000	0000
				M20 × 2.5 mm	30	10	ISO Class 04	DIN 439B, ISO 4035	10	000000000	0000
				M22 × 1.5 mm	32	11	ISO Class 04	DIN 439B, ISO 4035	10	000000000	0000
				M22 × 2.5 mm	32	11	—	DIN 439B, ISO 4035	1	000000000	0000
				M24 × 1.5 mm	36	12	ISO Class 04	DIN 439B, ISO 4035	5	000000000	00000
				M24 × 2 mm	36	12	ISO Class 04	DIN 439B, ISO 4035	5	000000000	00000
				M24 × 3 mm	36	12	ISO Class 04	DIN 439B, ISO 4035	5	000000000	0000
				M27 × 1.5 mm	41	13.5	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000
				M27 × 2 mm	41	13.5	ISO Class 04	DIN 439B, ISO 4035	1	000000000	0000
				M30 × 2 mm	46	15	ISO Class 04	DIN 439B, ISO 4035	1	000000000	0000
				M30 × 3.5 mm	46	15	—	DIN 439B, ISO 4035	1	000000000	0000
				M33 × 2 mm	50	16.5	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000
				M36 × 3 mm	55	18	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000
				M36 × 4 mm	55	18	ISO Class 04	DIN 439B, ISO 4035	1	000000000	0000
				M39 × 3 mm	60	19.5	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000
				M42 × 3 mm	65	21	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000
				M45 × 3 mm	70	22.5	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000
				M48 × 3 mm	75	24	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000
				M48 × 5 mm	75	24	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000
				M52 × 3 mm	80	26	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000
				M52 × 5 mm	80	26	ISO Class 04	DIN 439B, ISO 4035	1	000000000	00000

				Blue Dyed Steel


			M6 × 1 mm		10	3.2	ISO Class 04	DIN 439B, ISO 4035	50	000000000	0000
			M8 × 1.25 mm		13	4	ISO Class 04	DIN 439B, ISO 4035	50	000000000	0000
			M10 × 1.5 mm		17	5	ISO Class 04	DIN 439B, ISO 4035	50	000000000	00000
			M12 × 1.75 mm		19	6	ISO Class 04	DIN 439B, ISO 4035	25	000000000	0000
			M16 × 2 mm		24	8	ISO Class 04	DIN 439B, ISO 4035	10	000000000	0000
			M20 × 2.5 mm		30	10	ISO Class 04	DIN 439B, ISO 4035	10	000000000	00000
			M24 × 3 mm		36	12	ISO Class 04	DIN 439B, ISO 4035	1	000000000	0000

Corrosion-Resistant Stainless Steel

18-8 Stainless Steel—The choice for wet and outdoor environments, these nuts resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

Black-Oxide 18-8 Stainless Steel—Typically chosen for their appearance, these nuts have a dark, matte coating to create a finished look. They resist rust in wet and outdoor environments, but won't hold up to the harsh chemicals that 316 stainless steel can.

Super-Corrosion-Resistant 316 Stainless Steel—Superior to 18-8 stainless steel, these nuts won't degrade when exposed to harsh weather, salt water, and most chemicals.

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


	M1.6 × 0.35 mm	3.2	1	DIN 439B, ISO 4035	1	000000000	00000
	M2 × 0.4 mm	4	1.2	DIN 439B, ISO 4035	50	000000000	0000
	M2.5 × 0.45 mm	5	1.6	DIN 439B, ISO 4035	50	000000000	0000
	M3 × 0.5 mm	5.5	1.8	DIN 439B, ISO 4035	100	000000000	00000
	M4 × 0.7 mm	7	2.2	DIN 439B, ISO 4035	100	000000000	0000
	M5 × 0.8 mm	8	2.7	DIN 439B, ISO 4035	100	000000000	0000
	M6 × 1 mm	10	3.2	DIN 439B, ISO 4035	100	000000000	0000
	M8 × 1 mm	13	4	DIN 439B, ISO 4035	25	000000000	0000
	M8 × 1.25 mm	13	4	DIN 439B, ISO 4035	50	000000000	00000
	M10 × 1 mm	17	5	DIN 439B, ISO 4035	10	000000000	0000
	M10 × 1.25 mm	17	5	DIN 439B, ISO 4035	10	000000000	0000
	M10 × 1.5 mm	17	5	DIN 439B, ISO 4035	25	000000000	0000
	M12 × 1 mm	19	6	DIN 439B, ISO 4035	10	000000000	00000
	M12 × 1.25 mm	19	6	DIN 439B, ISO 4035	10	000000000	0000
	M12 × 1.5 mm	19	6	DIN 439B, ISO 4035	10	000000000	0000
	M12 × 1.75 mm	19	6	DIN 439B, ISO 4035	20	000000000	0000
	M14 × 1.5 mm	22	7	DIN 439B, ISO 4035	5	000000000	0000
	M14 × 2 mm	22	7	DIN 439B, ISO 4035	5	000000000	0000
	M16 × 1.5 mm	24	8	DIN 439B, ISO 4035	5	000000000	00000
	M16 × 2 mm	24	8	DIN 439B, ISO 4035	5	000000000	0000
	M18 × 1.5 mm	27	9	DIN 439B, ISO 4035	1	000000000	0000
	M18 × 2.5 mm	27	9	DIN 439B, ISO 4035	5	000000000	00000
	M20 × 1.5 mm	30	10	DIN 439B, ISO 4035	1	000000000	0000
	M20 × 2 mm	30	10	DIN 439B, ISO 4035	5	000000000	00000
	M20 × 2.5 mm	30	10	DIN 439B, ISO 4035	5	000000000	00000
	M22 × 1.5 mm	32	11	DIN 439B, ISO 4035	1	000000000	00000
	M22 × 2.5 mm	32	11	DIN 439B, ISO 4035	1	000000000	00000
	M24 × 1.5 mm	36	12	DIN 439B, ISO 4035	1	000000000	0000
	M24 × 2 mm	36	12	DIN 439B, ISO 4035	1	000000000	00000
	M24 × 3 mm	36	12	DIN 439B, ISO 4035	1	000000000	0000
	M30 × 1.5 mm	46	15	DIN 439B, ISO 4035	1	000000000	00000
	M30 × 2 mm	46	15	DIN 439B, ISO 4035	1	000000000	00000
	M30 × 3.5 mm	46	15	DIN 439B, ISO 4035	1	000000000	00000
	M36 × 1.5 mm	55	18	DIN 439B, ISO 4035	1	000000000	00000
	M36 × 4 mm	55	18	DIN 439B, ISO 4035	1	000000000	00000

	Black-Oxide 18-8 Stainless Steel


			M2 × 0.4 mm	4	1.2	DIN 439B, ISO 4035	10	000000000	0000
			M2.5 × 0.45 mm	5	1.6	DIN 439B, ISO 4035	10	000000000	0000
			M3 × 0.5 mm	5.5	1.8	DIN 439B, ISO 4035	10	000000000	0000
			M4 × 0.7 mm	7	2.2	DIN 439B, ISO 4035	5	000000000	0000
			M5 × 0.8 mm	8	2.7	DIN 439B, ISO 4035	5	000000000	0000
			M6 × 1 mm	10	3.2	DIN 439B, ISO 4035	5	000000000	0000
			M8 × 1 mm	13	4	DIN 439B, ISO 4035	5	000000000	0000
			M8 × 1.25 mm	13	4	DIN 439B, ISO 4035	5	000000000	0000
			M10 × 1 mm	17	5	DIN 439B, ISO 4035	5	000000000	0000
			M10 × 1.25 mm	17	5	DIN 439B, ISO 4035	5	000000000	0000
			M10 × 1.5 mm	17	5	DIN 439B, ISO 4035	5	000000000	0000
			M12 × 1.25 mm	19	6	DIN 439B, ISO 4035	5	000000000	0000
			M12 × 1.5 mm	19	6	DIN 439B, ISO 4035	5	000000000	0000
			M12 × 1.75 mm	19	6	DIN 439B, ISO 4035	5	000000000	0000
			M14 × 1.5 mm	22	7	DIN 439B, ISO 4035	1	000000000	0000
			M14 × 2 mm	22	7	DIN 439B, ISO 4035	1	000000000	0000
			M16 × 1.5 mm	24	8	DIN 439B, ISO 4035	1	000000000	0000
			M16 × 2 mm	24	8	DIN 439B, ISO 4035	1	000000000	0000
			M18 × 1.5 mm	27	9	DIN 439B, ISO 4035	1	000000000	0000
			M18 × 2.5 mm	27	9	DIN 439B, ISO 4035	1	000000000	0000
			M20 × 1.5 mm	30	10	DIN 439B, ISO 4035	1	000000000	0000
			M24 × 1.5 mm	36	12	DIN 439B, ISO 4035	1	000000000	0000

Super-Corrosion-Resistant 316 Stainless Steel


			M2 × 0.4 mm	4	1.2	DIN 439B, ISO 4035	25	000000000	0000
			M2.5 × 0.45 mm	5	1.6	DIN 439B, ISO 4035	50	000000000	0000
			M3 × 0.5 mm	5.5	1.8	DIN 439B, ISO 4035	100	000000000	00000
			M4 × 0.7 mm	7	2.2	DIN 439B, ISO 4035	50	000000000	0000
			M5 × 0.8 mm	8	2.7	DIN 439B, ISO 4035	50	000000000	0000
			M6 × 1 mm	10	3.2	DIN 439B, ISO 4035	50	000000000	00000
			M8 × 0.75 mm	13	4	DIN 439B, ISO 4035	10	000000000	0000
			M8 × 1 mm	13	4	DIN 439B, ISO 4035	10	000000000	0000
			M8 × 1.25 mm	13	4	DIN 439B, ISO 4035	50	000000000	00000
			M10 × 1.25 mm	17	5	DIN 439B, ISO 4035	5	000000000	0000
			M10 × 1.5 mm	17	5	DIN 439B, ISO 4035	20	000000000	00000
			M12 × 1.25 mm	19	6	DIN 439B, ISO 4035	1	000000000	0000
			M12 × 1.5 mm	19	6	DIN 439B, ISO 4035	1	000000000	0000
			M12 × 1.75 mm	19	6	DIN 439B, ISO 4035	10	000000000	00000
			M14 × 1.5 mm	22	7	DIN 439B, ISO 4035	1	000000000	0000
			M14 × 2 mm	22	7	DIN 439B, ISO 4035	5	000000000	0000
			M16 × 1.5 mm	24	8	DIN 439B, ISO 4035	1	000000000	0000
			M16 × 2 mm	24	8	DIN 439B, ISO 4035	5	000000000	00000
			M18 × 1.5 mm	27	9	DIN 439B, ISO 4035	1	000000000	0000
			M20 × 2 mm	30	10	DIN 439B, ISO 4035	1	000000000	0000
			M20 × 2.5 mm	30	10	DIN 439B, ISO 4035	1	000000000	0000
			M24 × 3 mm	36	12	DIN 439B, ISO 4035	1	000000000	00000
			M27 × 2 mm	41	13.5	DIN 439B, ISO 4035	1	000000000	00000
			M30 × 2 mm	46	15	DIN 439B, ISO 4035	1	000000000	00000
			M30 × 3.5 mm	46	15	DIN 439B, ISO 4035	1	000000000	00000
			M33 × 2 mm	50	16.5	DIN 439B, ISO 4035	1	000000000	00000
			M36 × 1.5 mm	55	18	DIN 439B, ISO 4035	1	000000000	00000
			M36 × 4 mm	55	18	DIN 439B, ISO 4035	1	000000000	00000

Brass

Brass—Conductive and nonmagnetic, brass nuts are commonly used to secure electrical equipment, such as circuit board assemblies and mounting brackets, inside enclosures. They're also softer than most metals, so they won't damage other fastening components.

Nickel-Plated Brass—The nickel plating offers better corrosion resistance than plain brass to stand up to solvents, salt water, and chemicals. The plating can wear off over time, so these nuts are not recommended for applications that experience a lot of friction or wear.

	Wd., mm	Ht., mm	Specs. Met	Pkg. Qty.		Pkg.
Brass


	M2 × 0.4 mm	4	1.2	DIN 439B, ISO 4035	50	000000000	00000
	M2.5 × 0.45 mm	5	1.6	DIN 439B, ISO 4035	50	000000000	0000
	M3 × 0.5 mm	5.5	1.8	DIN 439B, ISO 4035	100	000000000	00000
	M4 × 0.7 mm	7	2.2	DIN 439B, ISO 4035	100	000000000	00000
	M5 × 0.8 mm	8	2.7	DIN 439B, ISO 4035	100	000000000	00000
	M6 × 1 mm	10	3.2	DIN 439B, ISO 4035	50	000000000	00000
	M8 × 1.25 mm	13	4	DIN 439B, ISO 4035	25	000000000	00000
	M10 × 1.5 mm	17	5	DIN 439B, ISO 4035	5	000000000	0000
	M12 × 1.75 mm	19	6	DIN 439B, ISO 4035	10	000000000	00000
	M16 × 2 mm	24	8	DIN 439B, ISO 4035	1	000000000	0000

	Nickel-Plated Brass


			M2 × 0.4 mm	4	1.2	DIN 439B, ISO 4035	25	000000000	0000
			M2.5 × 0.45 mm	5	1.6	DIN 439B, ISO 4035	25	000000000	0000
			M3 × 0.5 mm	5.5	1.8	DIN 439B, ISO 4035	25	000000000	0000
			M4 × 0.7 mm	7	2.2	DIN 439B, ISO 4035	25	000000000	0000
			M5 × 0.8 mm	8	2.7	DIN 439B, ISO 4035	25	000000000	0000
			M6 × 1 mm	10	3.2	DIN 439B, ISO 4035	10	000000000	0000
			M8 × 1.25 mm	13	4	DIN 439B, ISO 4035	10	000000000	0000
			M10 × 1.5 mm	17	5	DIN 439B, ISO 4035	5	000000000	0000
			M12 × 1.75 mm	19	6	DIN 439B, ISO 4035	1	000000000	0000

Left-Hand-Thread Thin-Profile Hex Nuts

These nuts tighten when turned to the left. Use them with left-hand rods and screws to prevent counterclockwise-moving parts from loosening. About half the height of standard-profile nuts, these fit in spaces with low clearance. You can also use them as jam nuts by threading them against another hex nut to hold it in place.