One Way Fasteners | McMaster-Carr

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117 Products

Tamper-Resistant One-Way-Drive Stainless Steel Round Head Screws

Image of Product. Front orientation. Contains MultipleImages. Rounded Head Screws. Tamper-Resistant One-Way-Drive Stainless Steel Round Head Screws.

Install these tamper-resistant screws in corrosive environments with a common slotted driver. Once installed, the drive’s sloped walls cause drivers to slip, making these screws difficult to remove without one-way screw removers. They're often found on public facilities, such as restroom partitions and other long-term installations, where tamper resistance is important and removal for maintenance is unlikely.

Length is measured from under the head.

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

One-Way Screw Removers—Extract one-way screws. With two pins on the driver's end, they grip one-way screws to loosen them when slotted drivers just slip.

	Screws									One-Way Screw Removers
		Head
	Lg.	Dia.	Ht.	Threading	Tensile Strength, psi	Specs. Met	Pkg. Qty.		Pkg.		Each
18-8 Stainless Steel







				4-40

				3/16"	0.211"	0.086"	Fully Threaded	80,000	—	100	90288A104	000000	7392A52	000000


				1/4"	0.211"	0.086"	Fully Threaded	80,000	—	100	90288A106	00000	7392A52	00000
				3/8"	0.211"	0.086"	Fully Threaded	80,000	ASME B18.6.3	100	90288A108	00000	7392A52	00000
				1/2"	0.211"	0.086"	Fully Threaded	80,000	ASME B18.6.3	100	90288A110	00000	7392A52	00000
				3/4"	0.211"	0.086"	Fully Threaded	80,000	—	100	90288A112	00000	7392A52	00000




						6-32

						3/16"	0.26"	0.103"	Fully Threaded	80,000	ASME B18.6.3	100	90288A143	00000	7392A52	00000


						1/4"	0.26"	0.103"	Fully Threaded	80,000	ASME B18.6.3	100	90288A144	00000	7392A52	00000
						3/8"	0.26"	0.103"	Fully Threaded	80,000	ASME B18.6.3	100	90288A146	00000	7392A52	00000
						1/2"	0.26"	0.103"	Fully Threaded	80,000	ASME B18.6.3	100	90288A148	00000	7392A52	00000
						3/4"	0.26"	0.103"	Fully Threaded	80,000	ASME B18.6.3	100	90288A151	00000	7392A52	00000
						1"	0.26"	0.103"	Fully Threaded	80,000	ASME B18.6.3	50	90288A153	00000	7392A52	00000
						1 1/2"	0.26"	0.103"	Fully Threaded	80,000	ASME B18.6.3	50	90288A157	00000	7392A52	00000




								8-32

								1/4"	0.309"	0.12"	Fully Threaded	80,000	ASME B18.6.3	50	90288A190	00000	7392A52	00000


								3/8"	0.309"	0.12"	Fully Threaded	80,000	ASME B18.6.3	50	90288A192	00000	7392A52	00000
								1/2"	0.309"	0.12"	Fully Threaded	80,000	ASME B18.6.3	50	90288A194	00000	7392A52	00000
								3/4"	0.309"	0.12"	Fully Threaded	80,000	ASME B18.6.3	50	90288A197	00000	7392A52	00000
								1"	0.309"	0.12"	Fully Threaded	80,000	ASME B18.6.3	50	90288A199	00000	7392A52	00000
								1 1/2"	0.309"	0.12"	Fully Threaded	80,000	ASME B18.6.3	50	90288A203	00000	7392A52	00000




										10-24

										1/2"	0.359"	0.137"	Fully Threaded	80,000	ASME B18.6.3	50	90288A242	00000	7392A63	00000


										3/4"	0.359"	0.137"	Fully Threaded	80,000	ASME B18.6.3	50	90288A245	00000	7392A63	00000
										1"	0.359"	0.137"	Fully Threaded	80,000	ASME B18.6.3	50	90288A247	00000	7392A63	00000
										1 1/4"	0.359"	0.137"	Fully Threaded	80,000	ASME B18.6.3	50	90288A249	00000	7392A63	00000
										1 1/2"	0.359"	0.137"	Fully Threaded	80,000	ASME B18.6.3	25	90288A251	00000	7392A63	00000




												10-32

1/4"												0.359"	0.137"	Fully Threaded	80,000	—	50	90288A270	00000	7392A63	00000


3/8"	0.359"											0.137"	Fully Threaded	80,000	—	50	90288A274	00000	7392A63	00000
1/2"	0.359"											0.137"	Fully Threaded	80,000	ASME B18.6.3	50	90288A829	00000	7392A63	00000
5/8"	0.359"	0.137"										Fully Threaded	80,000	ASME B18.6.3	50	90288A830	00000	7392A63	00000
3/4"	0.359"	0.137"	Fully Threaded									80,000	ASME B18.6.3	50	90288A831	00000	7392A63	00000
1"	0.359"	0.137"	Fully Threaded									80,000	ASME B18.6.3	50	90288A833	00000	7392A63	00000
1 1/4"	0.359"	0.137"	Fully Threaded									80,000	ASME B18.6.3	25	90288A835	00000	7392A63	00000
1 1/2"	0.359"	0.137"	Fully Threaded									80,000	ASME B18.6.3	25	90288A836	00000	7392A63	00000




		1/4"-20

		3/8"	0.472"									0.175"	Fully Threaded	80,000	—	25	90288A536	00000	7392A64	00000


		1/2"	0.472"	0.175"								Fully Threaded	80,000	—	25	90288A537	00000	7392A64	00000
		3/4"	0.472"	0.175"	Fully Threaded							80,000	—	25	90288A540	00000	7392A64	00000
		1"	0.472"	0.175"	Fully Threaded							80,000	—	25	90288A542	00000	7392A64	00000
		1 1/2"	0.472"	0.175"	Fully Threaded							80,000	—	25	90288A546	00000	7392A64	00000
		2"	0.472"	0.175"	Fully Threaded							80,000	ASME B18.6.3	10	90288A550	00000	7392A64	00000

Tamper-Resistant One-Way Stainless Steel Rounded Head Screws for Sheet Metal

Image of Product. Front orientation. Contains MultipleImages. Tapping Screws. Tamper-Resistant One-Way Stainless Steel Rounded Head Screws for Sheet Metal.

Simple to install but hard to remove, these screws tighten with a common slotted driver. Once installed, the drive is difficult to turn with anything other than a one-way screw remover. Screws have a pointed tip that starts a hole in sheets up to 0.025" thick, but for thicker material you’ll need to drill first. These screws resist corrosion and have a rounded head for a finished look.

Length is measured from under the head.

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

One-Way Screw Removers—With two pins on the end, these tools grip one-way screws to loosen them when slotted drivers just slip.

	Tapping Screws									One-Way Screw Removers
		Head
	Lg.	Dia.	Ht.	Tapping Screw Type	Approx. Threads per In.	Drill Bit Size	Pkg. Qty.		Pkg.		Each
18-8 Stainless Steel







				No. 6 Screw Size

				3/8"	0.262"	0.104"	AB	18	32 Ga.	100	90090A145	000000	7392A52	000000


				1/2"	0.26"	0.103"	AB	18	32 Ga.	100	90090A148	00000	7392A52	00000
				3/4"	0.26"	0.103"	AB	18	32 Ga.	100	90090A151	00000	7392A52	00000
				1"	0.26"	0.103"	AB	18	32 Ga.	50	90090A153	00000	7392A52	00000




						No. 8 Screw Size

						3/8"	0.312"	0.123"	AB	15	29 Ga.	50	90090A191	00000	7392A52	00000


						1/2"	0.309"	0.12"	AB	15	29 Ga.	50	90090A194	00000	7392A52	00000
						3/4"	0.309"	0.12"	AB	15	29 Ga.	50	90090A197	00000	7392A52	00000
						1"	0.309"	0.12"	AB	15	29 Ga.	50	90090A199	00000	7392A52	00000
						1 1/4"	0.309"	0.12"	AB	15	29 Ga.	50	90090A201	00000	7392A52	00000
						1 1/2"	0.309"	0.12"	AB	15	29 Ga.	50	90090A203	0000	7392A52	00000




								No. 10 Screw Size

								1/2"	0.359"	0.137"	AB	12	21 Ga.	50	90090A242	00000	7392A52	00000


								3/4"	0.359"	0.137"	AB	12	21 Ga.	50	90090A245	00000	7392A52	00000
								1"	0.359"	0.137"	AB	12	21 Ga.	50	90090A247	00000	7392A52	00000
								1 1/2"	0.359"	0.137"	AB	12	21 Ga.	50	90090A251	00000	7392A52	00000
								2"	0.359"	0.137"	AB	12	21 Ga.	25	90090A253	00000	7392A52	00000




										No. 12 Screw Size

										1"	0.425"	1/8"	A	11	3/16"	25	90090A296	0000	7392A52	00000


										1 1/2"	0.425"	1/8"	A	11	3/16"	25	90090A299	00000	7392A52	00000
										2"	0.425"	1/8"	A	11	3/16"	25	90090A300	00000	7392A52	00000




												No. 14 Screw Size

												1/2"	0.472"	0.175"	AB	10	5.5 mm	50	90090A310	00000	7392A52	00000


												3/4"	0.472"	0.175"	AB	10	5.5 mm	25	90090A313	00000	7392A52	00000
												1"	0.472"	0.175"	AB	10	5.5 mm	25	90090A315	00000	7392A52	00000
1 1/2"												0.472"	0.175"	AB	10	5.5 mm	25	90090A317	00000	7392A52	00000
2"	0.472"											0.175"	AB	10	5.5 mm	25	90090A319	00000	7392A52	00000
3"	0.472"											0.175"	AB	10	5.5 mm	10	90090A323	00000	7392A52	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	00000


				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	0000
				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	0000


				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	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	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

Tamper-Resistant One-Way-Drive Steel Round Head Screws

Install these tamper-resistant screws with a common slotted driver. Once installed, the drive's sloped walls cause drivers to slip, making these screws difficult to remove without one-way screw removers. They're often found on public facilities, such as restroom partitions and other long-term installations, where tamper resistance is important and removal for maintenance is unlikely.

Length is measured from under the head.

Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.

One-Way Screw Removers—Extract one-way screws. With two pins on the driver's end, they grip one-way screws to loosen them when slotted drivers just slip.

	Screws									One-Way Screw Removers
		Head
	Lg.	Dia.	Ht.	Threading	Tensile Strength, psi	Specs. Met	Pkg. Qty.		Pkg.		Each
Zinc-Plated Steel







				4-40

				1/4"	0.211"	0.086"	Fully Threaded	60,000	—	100	90287A837	000000	7392A52	000000


				3/8"	0.211"	0.086"	Fully Threaded	60,000	—	100	90287A838	00000	7392A52	00000
				1/2"	0.211"	0.086"	Fully Threaded	60,000	—	100	90287A839	00000	7392A52	00000
				3/4"	0.211"	0.086"	Fully Threaded	60,000	—	100	90287A841	00000	7392A52	00000




						6-32

						1/4"	0.26"	0.103"	Fully Threaded	60,000	—	100	90287A842	00000	7392A52	00000


						3/8"	0.26"	0.103"	Fully Threaded	60,000	ASME B18.6.3	100	90287A146	00000	7392A52	00000
						1/2"	0.26"	0.103"	Fully Threaded	60,000	ASME B18.6.3	100	90287A148	00000	7392A52	00000
						3/4"	0.26"	0.103"	Fully Threaded	60,000	ASME B18.6.3	100	90287A151	00000	7392A52	00000
						1"	0.26"	0.103"	Fully Threaded	60,000	ASME B18.6.3	100	90287A153	00000	7392A52	00000




								8-32

								1/4"	0.309"	0.12"	Fully Threaded	60,000	—	100	90287A843	00000	7392A52	00000


								3/8"	0.309"	0.12"	Fully Threaded	60,000	—	100	90287A844	00000	7392A52	00000
								1/2"	0.309"	0.12"	Fully Threaded	60,000	ASME B18.6.3	100	90287A194	00000	7392A52	00000
								3/4"	0.309"	0.12"	Fully Threaded	60,000	ASME B18.6.3	100	90287A197	00000	7392A52	00000
								1"	0.309"	0.12"	Fully Threaded	60,000	ASME B18.6.3	100	90287A199	00000	7392A52	00000
								1 1/2"	0.309"	0.12"	Fully Threaded	60,000	ASME B18.6.3	100	90287A203	00000	7392A52	00000




										10-24

										1/2"	0.359"	0.137"	Fully Threaded	60,000	ASME B18.6.3	100	90287A242	00000	7392A63	00000


										3/4"	0.359"	0.137"	Fully Threaded	60,000	ASME B18.6.3	100	90287A245	00000	7392A63	00000
										1"	0.359"	0.137"	Fully Threaded	60,000	ASME B18.6.3	100	90287A247	00000	7392A63	00000
										1 1/2"	0.359"	0.137"	Fully Threaded	60,000	ASME B18.6.3	50	90287A251	00000	7392A63	00000




												10-32

												1/4"	0.359"	0.137"	Fully Threaded	60,000	—	100	90287A846	00000	7392A63	00000


												3/8"	0.359"	0.137"	Fully Threaded	60,000	—	100	90287A847	00000	7392A63	00000
1/2"												0.359"	0.137"	Fully Threaded	60,000	ASME B18.6.3	100	90287A829	00000	7392A63	00000
3/4"	0.359"											0.137"	Fully Threaded	60,000	ASME B18.6.3	100	90287A831	00000	7392A63	00000
1"	0.359"											0.137"	Fully Threaded	60,000	ASME B18.6.3	100	90287A833	00000	7392A63	00000
1 1/2"	0.359"											0.137"	Fully Threaded	60,000	ASME B18.6.3	50	90287A836	00000	7392A63	00000




		1/4"-20

		3/8"	0.472"									0.175"	Fully Threaded	60,000	—	50	90287A848	00000	7392A64	00000


		1/2"	0.472"									0.175"	Fully Threaded	60,000	ASME B18.6.3	50	90287A537	00000	7392A64	00000
		3/4"	0.472"									0.175"	Fully Threaded	60,000	ASME B18.6.3	50	90287A540	00000	7392A64	00000
		1"	0.472"									0.175"	Fully Threaded	60,000	ASME B18.6.3	50	90287A542	00000	7392A64	00000
		1 1/2"	0.472"									0.175"	Fully Threaded	60,000	ASME B18.6.3	50	90287A546	00000	7392A64	00000