Tamper-Resistant Nuts | McMaster-Carr

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78 Products

Tri-Groove-Drive Tamper-Resistant Nuts

Tri-groove-drive nuts are narrower than sloped and drilled-spanner-drive nuts to fit in tight spaces. Install with a tri-groove socket and either a socket driver or an open-end wrench (all sold separately). Use them to reduce the risk of unwanted removal for objects in public spaces such as signs, lighting fixtures, and displays.

Zinc—Zinc nuts are lightweight and corrosion resistant in wet environments.

Zinc-Plated Steel—Zinc-plated steel nuts are coated to protect the steel from corrosion in wet environments.

316 Stainless Steel—316 stainless steel nuts won’t corrode from water, chemicals, or salt spray.

	Nuts						Tri-Groove Sockets		Socket Drivers		Open-End Wrenches
	Thread Size	Dia.	Ht.	Pkg. Qty.		Pkg.		Each		Each		Each
Zinc


		M6 × 1 mm	0.66"	0.265"	10	90080A304	00000	7393A37	000000	5522A77	000000	———	0
		M8 × 1.25 mm	0.83"	0.345"	10	90080A305	0000	7393A38	00000	5522A77	00000	———	0

		Zinc-Plated Steel


				10-24	0.64"	0.265"	25	90080A220	00000	7393A37	00000	5522A77	00000	———	0
				10-32	0.64"	0.265"	25	90080A230	00000	7393A37	00000	5522A77	00000	———	0
				1/4"-20	0.64"	0.265"	25	90080A240	00000	7393A37	00000	5522A77	00000	———	0
				5/16"-18	0.83"	0.345"	25	90080A250	00000	7393A38	00000	5522A77	00000	———	0
				3/8"-16	0.83"	0.345"	25	90080A260	00000	7393A38	00000	5522A77	00000	———	0

				316 Stainless Steel


						10-24	0.65"	0.265"	10	90080A326	00000	7393A37	00000	5522A77	00000	———	0
						10-32	0.65"	0.265"	10	90080A327	00000	7393A37	00000	5522A77	00000	———	0
						1/4"-20	0.66"	0.265"	10	90080A301	00000	7393A37	00000	5522A77	00000	———	0
						1/4"-28	0.65"	0.265"	10	90080A328	00000	7393A37	00000	5522A77	00000	———	0
						5/16"-18	0.83"	0.345"	10	90080A302	00000	7393A38	00000	5522A77	00000	———	0
						5/16"-24	0.83"	0.35"	5	90080A329	00000	7393A38	00000	5522A77	00000	———	0
						3/8"-16	0.83"	0.345"	10	90080A303	00000	7393A38	00000	5522A77	00000	———	0
						3/8"-24	0.83"	0.35"	5	90080A331	00000	7393A38	00000	5522A77	00000	———	0
						7/16"-14	0.83"	0.34"	1	90080A332	0000	7393A38	00000	5522A77	00000	———	0
						1/2"-13	0.93"	0.345"	1	90080A334	0000	7393A101	00000	5522A77	00000	———	0
						1/2"-20	0.93"	0.345"	1	90080A335	0000	7393A101	00000	5522A77	00000	———	0
						5/8"-11	1.51"	0.505"	1	90080A336	00000	7393A43	000000	———	0	5400A28	000000
						5/8"-18	1.51"	0.505"	1	90080A337	00000	7393A43	000000	———	0	5400A28	00000
						3/4"-10	1.51"	0.505"	1	90080A338	00000	7393A43	000000	———	0	5400A28	00000
						3/4"-16	1.51"	0.505"	1	90080A339	00000	7393A43	000000	———	0	5400A28	00000
						M5 × 0.8 mm	0.66"	0.265"	5	90080A311	00000	7393A37	00000	5522A77	00000	———	0
						M6 × 1 mm	0.66"	0.265"	5	90080A312	00000	7393A37	00000	5522A77	00000	———	0
						M8 × 1 mm	0.82"	0.35"	1	90080A314	0000	7393A38	00000	5522A77	00000	———	0
						M8 × 1.25 mm	0.82"	0.35"	5	90080A313	00000	7393A38	00000	5522A77	00000	———	0
						M10 × 1.25 mm	0.82"	0.35"	1	90080A316	0000	7393A38	00000	5522A77	00000	———	0
						M10 × 1.5 mm	0.82"	0.35"	1	90080A315	0000	7393A38	00000	5522A77	00000	———	0
						M12 × 1.5 mm	0.94"	0.35"	1	90080A318	0000	7393A101	00000	5522A77	00000	———	0
						M12 × 1.75 mm	0.94"	0.35"	1	90080A317	0000	7393A101	00000	5522A77	00000	———	0
						M16 × 2 mm	1.51"	0.505"	1	90080A322	00000	7393A43	000000	———	0	5400A28	00000

Breakaway Tamper-Resistant Nuts


	Aluminum	Zinc	Zinc-Plated Alloy Steel	18-8 Stainless Steel

The most tamper-resistant nuts we offer, these have a hex head that breaks away upon tightening, leaving a non-removable cone. They can be installed using a standard wrench. Use them to reduce the risk of unwanted removal for objects in public spaces such as signs, lighting fixtures, and displays.

Aluminum—Aluminum nuts are lightweight, corrosion resistant in wet environments, and nonmagnetic.

Zinc and Zinc-Plated Alloy Steel—Zinc and zinc-plated alloy steel nuts are corrosion resistant in wet environments.

18-8 Stainless Steel—18-8 stainless steel nuts have good chemical resistance and may be mildly magnetic.

	Wd.	Ht.	Ht. After Installation	Breaking Torque, in·lbf	Pkg. Qty.		Pkg.
Aluminum


	10-24	7/16"	3/8"	3/16"	40	10	90013A150	00000
	1/4"-20	9/16"	31/64"	7/32"	70	10	90013A175	0000
	5/16"-18	5/8"	1/2"	7/32"	150	10	90013A200	00000
	3/8"-16	3/4"	19/32"	1/4"	195	10	90013A225	00000

	Zinc


			10-24	7/16"	25/64"	3/16"	40	10	90013A111	00000
			1/4"-20	9/16"	15/32"	7/32"	60	10	90013A112	00000
			5/16"-18	5/8"	1/2"	7/32"	110	10	90013A113	00000
			3/8"-16	3/4"	37/64"	1/4"	150	10	90013A114	00000
			1/2"-13	1"	3/4"	11/32"	360	5	90013A115	00000
			5/8"-11	1 1/8"	51/64"	3/8"	360	5	90013A116	00000
			M6 × 1 mm	14 mm	12 mm	6 mm	60	10	90013A118	00000
			M8 × 1.25 mm	16 mm	13 mm	6 mm	110	10	90013A119	00000
			M10 × 1.5 mm	19 mm	15 mm	6 mm	150	5	90013A121	00000
			M12 × 1.75 mm	25 mm	19 mm	9 mm	360	5	90013A122	00000

			Zinc-Plated Alloy Steel


					3/4"-10	1 1/4"	1"	13/32"	1,500	100	90013A117	000000

					18-8 Stainless Steel


							1/4"-20	9/16"	15/32"	7/32"	95	5	90013A123	00000
							5/16"-18	5/8"	1/2"	7/32"	130	5	90013A124	00000
							3/8"-16	3/4"	37/64"	1/4"	245	5	90013A125	00000
							1/2"-13	1"	3/4"	11/32"	405	100	90013A126	000000
							5/8"-11	1 1/8"	51/64"	3/8"	510	50	90013A127	000000
							M6 × 1 mm	10 mm	10 mm	5 mm	85	10	90013A128	00000
							M8 × 1.25 mm	13 mm	12 mm	7 mm	185	10	90013A129	00000
							M10 × 1.5 mm	17 mm	15 mm	9 mm	350	5	90013A131	00000
							M12 × 1.75 mm	19 mm	16 mm	9 mm	395	5	90013A132	00000

Drilled-Spanner-Drive Tamper-Resistant Nuts

A wide base and large bearing surface make these nuts good for securing large objects. They must be installed and removed with a nutdriver (sold separately). Use them to reduce the risk of unwanted removal for objects in public spaces such as signs, lighting fixtures, and displays.

Zinc—Made from zinc, they're corrosion resistant in wet environments.

	Nuts						Spanner Nutdrivers
	Thread Size	Dia.	Ht.	Pkg. Qty.		Pkg.		Each
Zinc


		1/4"-20	1"	1/4"	10	90078A110	000000	90078A041	000000
		5/16"-18	1"	1/4"	10	90078A120	00000	90078A041	00000
		3/8"-16	1"	1/4"	10	90078A130	00000	90078A041	00000
		M6 × 1 mm	1"	1/4"	10	90078A210	00000	90078A041	00000
		M8 × 1.25 mm	1"	1/4"	10	90078A220	00000	90078A041	00000
		M10 × 1.5 mm	1"	1/4"	10	90078A230	00000	90078A041	00000

Sloped Tamper-Resistant Nuts

Image of ProductInUse. Front orientation. Tamper-Resistant Nuts. Sloped Surface.

Sloped sides make these nuts difficult to grasp with standard hand tools to reduce the risk of unwanted removal. To install, thread a second sloped nut onto the bolt upside down and insert a wrench between the two nuts to fasten. They're often used to secure signs, lighting fixtures, and displays in public spaces.

Zinc-Yellow-Chromate-Plated Steel—A zinc yellow-chromate plating provides corrosion resistance in wet environments.

	Wd.	Ht.	Pkg. Qty.		Pkg.
Zinc-Yellow-Chromate-Plated Steel


	1/4"-20	1 3/64"	15/64"	5	98789A110	00000
	5/16"-18	1 3/64"	15/64"	5	98789A120	0000
	3/8"-16	1 3/64"	15/64"	5	98789A130	0000
	M6 × 1 mm	1 3/64"	15/64"	5	98789A210	0000
	M8 × 1.25 mm	1 3/64"	15/64"	5	98789A220	0000
	M10 × 1.5 mm	1 3/64"	15/64"	5	98789A230	0000

Serrated-Edge-Drive Tamper-Resistant Nuts

These nuts have serrations that dig into the material surface to resist loosening and are narrow to fit in tight spaces. They must be installed with a nutdriver (sold separately). Use them to reduce the risk of unwanted removal for objects in public spaces such as signs, lighting fixtures, and displays.

Aluminum—Aluminum nuts are lightweight, corrosion resistant in wet environments, and nonmagnetic.

	Nuts						Serrated-Edge Nutdrivers
	Thread Size	Dia.	Ht.	Pkg. Qty.		Pkg.		Each
Aluminum


		10-24	1/2"	3/16"	25	98577A110	000000	98577A200	000000
		1/4"-20	1/2"	3/16"	10	98577A120	0000	98577A200	00000
		5/16"-18	1/2"	3/16"	10	98577A130	0000	98577A200	00000