Steel Tamper-Resistant Nuts

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98 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-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-Plated Steel



		10-24	0.64"	0.265"	25	90080A220	000000	7393A37	000000	5522A77	000000	———	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	5414A16	000000
				5/8"-18	1.51"	0.505"	1	90080A337	00000	7393A43	000000	———	0	5414A16	00000
				3/4"-10	1.51"	0.505"	1	90080A338	00000	7393A43	000000	———	0	5414A16	00000
				3/4"-16	1.51"	0.505"	1	90080A339	00000	7393A43	000000	———	0	5414A16	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	5414A16	00000

Tri-Groove Sockets

Grip the indentations around the outside of tri-groove fasteners. These sockets are for hand-driven use only.

Black-Oxide Steel


Square Drive	1" Hex Drive Size, Standard Clearance	Tri-Groove Socket

Hex Drive Size—Hex-drive sockets are specialty sockets that require the use of another 1" socket when used with a ratchet wrench.

								Standard Clearance
	Drive Size	OD	Socket Shape	For Drive Style	For Fastener Type	For Screw Size (Head Dia.)	For Nut Size (Dia.)	Overall Lg.		Each
1/4" Square Drive



		No. 4	31/64"	Tri-Groove	Tri-Groove	Screws	No. 4 Rounded (0.13") No. 6 Flat (0.268")	—	1"	7393A34	000000


		No. 6	31/64"	Tri-Groove	Tri-Groove	Screws	No. 6, No. 8 Rounded (0.208") No. 8, No. 10 Flat (0.372")	—	1"	7393A35	00000
		No. 10	31/64"	Tri-Groove	Tri-Groove	Screws and Nuts	1/4", No. 10, No. 12 Rounded (0.334") 1/4" Flat (0.492")	No. 6, No. 8 (0.406")	1"	7393A36	00000


		3/8" Square Drive



				No. 20	47/64"	Tri-Groove	Tri-Groove	Screws and Nuts	5/16" Rounded (0.585")	No. 10, 1/4" (0.661")	1"	7393A37	00000


				No. 30	31/32"	Tri-Groove	Tri-Groove	Nuts	—	3/8", 5/16" (0.864")	1 1/4"	7393A38	00000
				No. 40	31/32"	Tri-Groove	Tri-Groove	Nuts	—	1/2" (0.93")	1 1/4"	7393A101	00000


				1" Hex Drive Size



						1"	1 5/8"	Tri-Groove	Tri-Groove	Nuts	—	M16, M20 (0.625", 16 mm, 18 mm, 0.75", 20 mm)	2"	7393A43	000000

Steel


Square Drive	Tri-Groove Socket

Hex Drive Size—Hex-drive sockets are specialty sockets that require the use of another 1" socket when used with a ratchet wrench.

							Standard Clearance
	Drive Size	OD	Socket Shape	For Drive Style	For Fastener Type	For Nut Size (Dia.)	Overall Lg.		Each
1/2" Square Drive



		1/2"	1 1/4"	Tri-Groove	Tri-Groove	Nuts	1/2", M12, M14 (12 mm, 0.5", 14 mm)	1 1/4"	7393A42	000000

Breakaway Tamper-Resistant Nuts

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.

Zinc-Plated Alloy Steel—Zinc alloy 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.
Zinc-Plated Alloy Steel



	3/4"-10	1 1/4"	1"	13/32"	1,500	100	90013A117	0000000


	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

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

Tamper-Resistant Torx Binding Barrels and Screws

A tamper-resistant Torx driver is required for installation and removal. Made from 18-8 stainless steel, these binding barrels and screws are chemical resistant and may be mildly magnetic. Barrel length and screw length are measured from under the head.

		Barrel							Screw
	For Material Thk.	Lg.	Dia.	Head Dia.	Head Ht.	Thread Dp.	Drive Size	Drive Style	Lg.	Head Dia.	Head Ht.	Drive Size	Drive Style	Includes	Thread Lg.		Each
18-8 Stainless Steel







				10-24

				3/8" to 1/2"	3/8"	1/4"	7/16"	7/64"	5/16"	T20	Tamper-Resistant Torx	1/4"	7/16"	7/64"	T20	Tamper-Resistant Torx	Barrel, Screw	—	96754A101	00000


				1/2" to 5/8"	1/2"	1/4"	7/16"	7/64"	1/4"	T20	Tamper-Resistant Torx	1/4"	7/16"	7/64"	T20	Tamper-Resistant Torx	Barrel, Screw	—	96754A102	0000
				5/8" to 3/4"	5/8"	1/4"	7/16"	7/64"	1/4"	T20	Tamper-Resistant Torx	1/4"	7/16"	7/64"	T20	Tamper-Resistant Torx	Barrel, Screw	—	96754A103	0000
				3/4" to 7/8"	3/4"	1/4"	7/16"	7/64"	3/8"	T20	Tamper-Resistant Torx	1/4"	7/16"	7/64"	T20	Tamper-Resistant Torx	Barrel, Screw	—	96754A104	0000
				1" to 1 1/8"	1"	1/4"	7/16"	7/64"	3/8"	T20	Tamper-Resistant Torx	1/4"	7/16"	7/64"	T20	Tamper-Resistant Torx	Barrel, Screw	—	96754A105	0000
				1 1/4" to 1 3/8"	1 1/4"	1/4"	7/16"	7/64"	3/8"	T20	Tamper-Resistant Torx	1/4"	7/16"	7/64"	T20	Tamper-Resistant Torx	Barrel, Screw	—	96754A106	0000
				1 1/2" to 1 5/8"	1 1/2"	1/4"	7/16"	7/64"	3/8"	T20	Tamper-Resistant Torx	1/4"	7/16"	7/64"	T20	Tamper-Resistant Torx	Barrel, Screw	—	96754A107	0000
				2" to 2 1/8"	2"	1/4"	7/16"	7/64"	3/8"	T20	Tamper-Resistant Torx	1/4"	7/16"	7/64"	T20	Tamper-Resistant Torx	Barrel, Screw	—	96754A108	00000




						1/4"-20

						1/2" to 5/8"	1/2"	5/16"	9/16"	9/64"	1/4"	T27	Tamper-Resistant Torx	1/4"	9/16"	9/64"	T27	Tamper-Resistant Torx	Barrel, Screw	—	96754A109	00000


						5/8" to 3/4"	1/2"	5/16"	9/16"	9/64"	1/4"	T27	Tamper-Resistant Torx	1/2"	9/16"	9/64"	T27	Tamper-Resistant Torx	Barrel, Screw	3/8"	96754A111	00000
						3/4" to 1"	3/4"	5/16"	9/16"	9/64"	3/8"	T27	Tamper-Resistant Torx	3/8"	9/16"	9/64"	T27	Tamper-Resistant Torx	Barrel, Screw	—	96754A112	00000
						7/8" to 1"	3/4"	5/16"	9/16"	9/64"	3/8"	T27	Tamper-Resistant Torx	1/2"	9/16"	9/64"	T27	Tamper-Resistant Torx	Barrel, Screw	3/8"	96754A113	00000
						1" to 1 1/4"	1"	5/16"	9/16"	9/64"	3/8"	T27	Tamper-Resistant Torx	3/8"	9/16"	9/64"	T27	Tamper-Resistant Torx	Barrel, Screw	—	96754A114	00000
						1 1/4" to 1 1/2"	1 1/4"	5/16"	9/16"	9/64"	1/2"	T27	Tamper-Resistant Torx	3/8"	9/16"	9/64"	T27	Tamper-Resistant Torx	Barrel, Screw	—	96754A115	00000
						1 1/2" to 1 5/8"	1 1/4"	5/16"	9/16"	9/64"	1/2"	T27	Tamper-Resistant Torx	1/2"	9/16"	9/64"	T27	Tamper-Resistant Torx	Barrel, Screw	1/4"	96754A116	00000

Tamper-Resistant One-Way Binding Barrels and Screws

Install these binding barrels and screws with a standard slotted screwdriver, but they require a special tool to remove. One-way removal tools are sold separately. Made from 18-8 stainless steel, these binding barrels and screws are chemical resistant and may be mildly magnetic. Barrel length and screw length are measured from under the head.

Black-Oxide 18-8 Stainless Steel—Black oxide binding barrels and screws have a matte-black finish that matches dark surfaces and reduces glare.

		Barrel						Screw
	For Material Thk.	Lg.	Dia.	Head Dia.	Head Ht.	Thread Dp.	Drive Style	Lg.	Head Dia.	Head Ht.	Drive Style	Includes	Thread Lg.	Shoulder Lg.	Pkg. Qty.		Pkg.
18-8 Stainless Steel







				10-24

				1/2" to 5/8"	1/4"	1/4"	7/16"	7/64"	7/32"	One Way	15/32"	7/16"	7/64"	One Way	Barrel, Screw	7/32"	1/4"	5	90650A311	000000


				1/2" to 5/8"	3/8"	1/4"	7/16"	7/64"	3/8"	One Way	23/64"	7/16"	7/64"	One Way	Barrel, Screw	15/64"	1/8"	5	90650A401	0000
				5/8" to 3/4"	3/8"	1/4"	7/16"	7/64"	5/16"	One Way	15/32"	7/16"	7/64"	One Way	Barrel, Screw	7/32"	1/4"	5	90650A312	00000
				5/8" to 3/4"	1/2"	1/4"	7/16"	7/64"	3/8"	One Way	3/8"	7/16"	7/64"	One Way	Barrel, Screw	1/4"	1/8"	5	90650A313	00000
				3/4" to 7/8"	1/2"	1/4"	7/16"	7/64"	3/8"	One Way	15/32"	7/16"	7/64"	One Way	Barrel, Screw	7/32"	1/4"	5	90650A314	00000
				3/4" to 1"	1/2"	1/4"	7/16"	7/64"	3/8"	One Way	9/16"	7/16"	7/64"	One Way	Barrel, Screw	5/16"	1/4"	5	90650A402	0000
				7/8" to 1 1/8"	5/8"	1/4"	7/16"	7/64"	9/16"	One Way	3/4"	7/16"	7/64"	One Way	Barrel, Screw	1/2"	1/4"	5	90650A315	0000
				7/8" to 1 1/8"	3/4"	1/4"	7/16"	7/64"	9/16"	One Way	1/2"	7/16"	7/64"	One Way	Barrel, Screw	3/8"	1/8"	5	90650A316	0000
				1 1/8" to 1 3/8"	3/4"	1/4"	7/16"	7/64"	17/32"	One Way	3/4"	7/16"	7/64"	One Way	Barrel, Screw	1/2"	1/4"	5	90650A403	0000
				1 1/8" to 1 3/8"	1"	1/4"	7/16"	7/64"	9/16"	One Way	1/2"	7/16"	7/64"	One Way	Barrel, Screw	3/8"	1/8"	5	90650A317	0000
				1 3/8" to 1 5/8"	1"	1/4"	7/16"	7/64"	17/32"	One Way	3/4"	7/16"	7/64"	One Way	Barrel, Screw	1/2"	1/4"	5	90650A404	0000


				1 7/16" to 1 3/4"	1"	1/4"	7/16"	7/64"	9/16"	One Way	15/16"	7/16"	7/64"	One Way	Barrel, Screw	11/16"	1/4"	5	90650A318	00000
				1 5/8" to 1 7/8"	1"	1/4"	7/16"	7/64"	9/16"	One Way	1 3/16"	7/16"	7/64"	One Way	Barrel, Screw	15/16"	1/4"	5	90650A319	00000
				1 3/4" to 2"	1"	1/4"	7/16"	7/64"	9/16"	One Way	1 5/16"	7/16"	7/64"	One Way	Barrel, Screw	1 1/16"	1/4"	5	90650A321	00000


				Black-Oxide 18-8 Stainless Steel







								10-24

								1/2" to 5/8"	1/4"	1/4"	7/16"	7/64"	7/32"	One Way	15/32"	7/16"	7/64"	One Way	Barrel, Screw	7/32"	1/4"	5	90650A322	00000


								5/8" to 3/4"	1/2"	1/4"	7/16"	7/64"	3/8"	One Way	3/8"	7/16"	7/64"	One Way	Barrel, Screw	1/4"	1/8"	5	90650A325	00000
								3/4" to 7/8"	5/8"	1/4"	7/16"	7/64"	9/16"	One Way	1/2"	7/16"	7/64"	One Way	Barrel, Screw	3/8"	1/8"	5	90650A327	00000
								7/8" to 1 1/8"	3/4"	1/4"	7/16"	7/64"	9/16"	One Way	1/2"	7/16"	7/64"	One Way	Barrel, Screw	3/8"	1/8"	5	90650A329	00000
								1" to 1 3/8"	3/4"	1/4"	7/16"	7/64"	9/16"	One Way	3/4"	7/16"	7/64"	One Way	Barrel, Screw	1/2"	1/4"	5	90650A331	00000
								1 1/8" to 1 3/8"	1"	1/4"	7/16"	7/64"	9/16"	One Way	1/2"	7/16"	7/64"	One Way	Barrel, Screw	3/8"	1/8"	5	90650A332	00000
								1 1/4" to 1 5/8"	1"	1/4"	7/16"	7/64"	9/16"	One Way	3/4"	7/16"	7/64"	One Way	Barrel, Screw	1/2"	1/4"	5	90650A333	00000
								1 7/16" to 1 3/4"	1"	1/4"	7/16"	7/64"	9/16"	One Way	15/16"	7/16"	7/64"	One Way	Barrel, Screw	11/16"	1/4"	5	90650A334	00000
								1 3/4" to 2"	1"	1/4"	7/16"	7/64"	9/16"	One Way	1 5/16"	7/16"	7/64"	One Way	Barrel, Screw	1 1/16"	1/4"	5	90650A336	00000

One-Way Screw Removers

		Each
One-Way Screw Removal Tool	7392A63	000000

Tri-Groove Socket Sets

Grip the indentations around the outside of tri-groove fasteners.

Black-Oxide Steel

	Components Included	Includes	Socket Shape	Drive Size		Each
1/4" Square Drive



	4	1 Drive Tool 3 Sockets	Standard: No. 4 (For No. 4 Standard Screws and No. 6 Countersunk Screws) Standard: No. 6 (For Nos. 6 and 8 Standard Screws and Nos. 8 and 10 Countersunk Screws) Standard: No. 10 (For Nos. 10, 12, and 1/4" Standard Screws, 1/4" Countersunk Screws, and Nos. 6 and 8 Nuts) 8" Long Socket Screwdiver Handle	Tri-Groove	No. 4, No. 6, No. 10	7393A41	000000

5-Point Impact Sockets

Turn 5-point tamper-resistant nuts and bolts often found on water and gas valves. The walls of the sockets are thicker and more flexible than standard sockets, so they can handle the high torque and force of impact tools without cracking.

Black-Oxide Steel

		Clearance Dp.					Standard Clearance
	Drive Size	Nut	Bolt	OD	Socket Shape	For Drive Style	Overall Lg.		Each
1/2" Square Drive



		13/16"	13/16"	13/16"	1 9/32"	5-Point	External Pentagon	2"	93278A110	000000

5-Point Sockets

5-Point

Socket

These sockets fit the nuts found on water and gas valves. Use with hand-driven tools only.

Black-Oxide Steel

					Standard Clearance
	Drive Size	OD	Socket Shape	For Drive Style	Overall Lg.		Each
3/8" Square Drive



		13/16"	1 1/8"	5-Point	External Pentagon	1 1/16"	5544A8	000000


		1/2" Square Drive



				13/16"	1 1/8"	5-Point	External Pentagon	2"	5491A35	00000