91870A340 | Tamper-Resistant Torx Flat Head Screws

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60,000 psi to 99,999 psi

100,000 psi to 129,999 psi

130,000 psi to 149,999 psi

150,000 psi or greater

Not Rated

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6,266 Products

Tamper-Resistant Torx Stainless Steel Flat Head Screws

These screws hold up against corrosion, deter unauthorized access, and prevent your driver from slipping. With a security pin in the drive, you can only turn them with a tamper-resistant Torx driver. Also known as pin-in-Torx, the drive has a deep six-lobe opening that withstands high torque without slipping and stripping the drive. Made of stainless steel, they won't rust or corrode when exposed to moisture and chemicals, but they're not as strong as alloy steel.

Length is measured from the top of 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.

Standard Profile—Standard-profile heads are the most common choice for flat head screws.

Undercut Profile—About a third thinner than standard heads, the undercut profile fits into shallow holes in thin material. The thin head also has more threading on the shaft, so they're often used to keep short screws from coming loose.

L-Keys—Turn screws by hand for more control and less chance of overtightening compared to power tools.

Power Tool Bits—Pair these bits with your power tools to turn screws more quickly than manual tools.

	Screws												L-Keys		Power Tool Bits
				Head
	Lg.	Countersink Angle	Flat Head Profile	Dia.	Ht.	Threading	Tensile Strength, psi	Specs. Met	Certificate Type	Pkg. Qty.		Pkg.		Each		Each
18-8 Stainless Steel







				4-40

				1/4"	82°	Standard	0.255"	0.083"	Fully Threaded	70,000	ASME B18.3	—	50	91870A711	000000	55525A25	00000	7233A63	00000


				1/4"	82°	Undercut	0.225"	0.047"	Fully Threaded	70,000	ASME B18.3	—	50	91870A110	00000	55525A23	0000	7233A61	0000
				5/16"	82°	Standard	0.255"	0.067"	Fully Threaded	70,000	ASME B18.3	—	50	91870A120	00000	55525A23	0000	7233A61	0000
				3/8"	82°	Standard	0.255"	0.083"	Fully Threaded	70,000	ASME B18.3	—	50	91870A130	00000	55525A23	0000	7233A61	0000
				1/2"	82°	Standard	0.255"	0.083"	Fully Threaded	70,000	ASME B18.3	—	50	91870A140	00000	55525A25	0000	7233A63	0000




						6-32

						1/4"	82°	Undercut	0.279"	0.059"	Fully Threaded	70,000	ASME B18.3	—	50	91870A150	00000	55525A25	0000	7233A63	0000


						5/16"	82°	Undercut	0.279"	0.059"	Fully Threaded	70,000	ASME B18.3	—	50	91870A160	00000	55525A25	0000	7233A63	0000
						3/8"	82°	Standard	0.307"	0.097"	Fully Threaded	70,000	ASME B18.3	—	25	91870A145	00000	55525A26	0000	7233A64	0000
						1/2"	82°	Standard	0.279"	0.083"	Fully Threaded	70,000	ASME B18.3	—	25	91870A148	00000	55525A25	0000	7233A63	0000
						5/8"	82°	Standard	0.307"	0.097"	Fully Threaded	70,000	ASME B18.3	—	25	91870A170	00000	55525A26	0000	7233A64	0000
						3/4"	82°	Standard	0.279"	0.083"	Fully Threaded	70,000	ASME B18.3	—	25	91870A151	00000	55525A25	0000	7233A63	0000
						1"	82°	Standard	0.279"	0.083"	Fully Threaded	70,000	ASME B18.3	—	25	91870A153	00000	55525A25	0000	7233A63	0000
						1 1/2"	82°	Standard	0.307"	0.097"	Fully Threaded	70,000	ASME B18.3	—	25	91870A713	00000	55525A26	0000	7233A64	0000




								8-32

								1/4"	82°	Undercut	0.332"	0.070"	Fully Threaded	70,000	ASME B18.3	—	25	91870A180	0000	55525A26	0000	7233A64	0000


								5/16"	82°	Undercut	0.332"	0.070"	Fully Threaded	70,000	ASME B18.3	—	25	91870A190	0000	55525A26	0000	7233A64	0000
								3/8"	82°	Standard	0.332"	0.100"	Fully Threaded	70,000	ASME B18.3	—	25	91870A192	00000	55525A26	0000	7233A64	0000
								1/2"	82°	Standard	0.359"	0.112"	Fully Threaded	70,000	ASME B18.3	—	25	91870A194	00000	55525A27	0000	7233A65	0000
								5/8"	82°	Standard	0.359"	0.112"	Fully Threaded	70,000	ASME B18.3	—	25	91870A210	0000	55525A27	0000	7233A65	0000
								3/4"	82°	Standard	0.359"	0.112"	Fully Threaded	70,000	ASME B18.3	—	25	91870A197	00000	55525A27	0000	7233A65	0000
								1"	82°	Standard	0.359"	0.112"	Fully Threaded	70,000	ASME B18.3	—	25	91870A199	00000	55525A27	0000	7233A65	0000
								1 1/4"	82°	Standard	0.359"	0.112"	Fully Threaded	70,000	ASME B18.3	—	25	91870A203	00000	55525A27	0000	7233A65	0000
								1 1/2"	82°	Standard	0.359"	0.112"	Fully Threaded	70,000	ASME B18.3	—	10	91870A206	0000	55525A27	0000	7233A65	0000
								2"	82°	Standard	0.359"	0.112"	Fully Threaded	70,000	ASME B18.3	—	10	91870A726	0000	55525A27	0000	7233A65	0000




										10-24

										3/8"	82°	Standard	0.411"	0.127"	Fully Threaded	70,000	ASME B18.3	—	25	91870A238	00000	55525A28	0000	7233A66	0000


										1/2"	82°	Standard	0.411"	0.127"	Fully Threaded	70,000	ASME B18.3	—	25	91870A242	00000	55525A28	0000	7233A66	0000
										5/8"	82°	Standard	0.411"	0.127"	Fully Threaded	70,000	ASME B18.3	—	25	91870A243	00000	55525A28	0000	7233A66	0000
										3/4"	82°	Standard	0.411"	0.127"	Fully Threaded	70,000	ASME B18.3	—	25	91870A245	00000	55525A28	0000	7233A66	0000
										1"	82°	Standard	0.411"	0.127"	Fully Threaded	70,000	ASME B18.3	—	25	91870A247	00000	55525A28	0000	7233A66	0000
										1 1/4"	82°	Standard	0.411"	0.127"	Fully Threaded	70,000	ASME B18.3	—	10	91870A259	0000	55525A28	0000	7233A66	0000
1 1/2"										82°	Standard	0.411"	0.127"	Fully Threaded	70,000	ASME B18.3	—	10	91870A261	0000	55525A28	0000	7233A66	0000




		10-32

		3/8"	82°							Standard	0.411"	0.127"	Fully Threaded	70,000	ASME B18.3	—	25	91870A826	00000	55525A28	0000	7233A66	0000


		1/2"	82°							Standard	0.411"	0.127"	Fully Threaded	70,000	ASME B18.3	—	25	91870A829	00000	55525A28	0000	7233A66	0000
		5/8"	82°							Standard	0.411"	0.127"	Fully Threaded	70,000	ASME B18.3	—	25	91870A220	00000	55525A28	0000	7233A66	0000
		3/4"	82°							Standard	0.411"	0.127"	Fully Threaded	70,000	ASME B18.3	—	25	91870A831	00000	55525A28	0000	7233A66	0000
		1"	82°							Standard	0.411"	0.127"	Fully Threaded	70,000	ASME B18.3	—	25	91870A833	00000	55525A28	0000	7233A66	0000
		1 1/4"	82°							Standard	0.411"	0.127"	Fully Threaded	70,000	ASME B18.3	—	10	91870A835	0000	55525A28	0000	7233A66	0000
		1 1/2"	82°							Standard	0.411"	0.127"	Fully Threaded	70,000	ASME B18.3	—	10	91870A838	0000	55525A28	0000	7233A66	0000




				12-24

				1/2"	82°					Undercut	0.412"	0.092"	Fully Threaded	70,000	ASME B18.3	—	25	91870A727	00000	55525A27	0000	7233A65	0000


				3/4"	82°					Standard	0.438"	0.132"	Fully Threaded	70,000	ASME B18.3	—	25	91870A728	00000	55525A28	0000	7233A66	0000
				1"	82°					Standard	0.438"	0.132"	Fully Threaded	70,000	ASME B18.3	—	25	91870A729	00000	55525A28	0000	7233A66	0000




										1/4"-20

										3/8"	82°	Undercut	0.477"	0.107"	Fully Threaded	70,000	ASME B18.3	—	10	91870A230	0000	55525A29	0000	7233A67	0000


						1/2"				82°	Undercut	0.477"	0.107"	Fully Threaded	70,000	ASME B18.3	—	10	91870A240	0000	55525A29	0000	7233A67	0000
						5/8"	82°			Standard	0.531"	0.161"	Fully Threaded	70,000	ASME B18.3	—	10	91870A250	0000	55525A31	0000	7233A68	0000
						3/4"	82°			Standard	0.531"	0.161"	Fully Threaded	70,000	ASME B18.3	—	10	91870A618	0000	55525A31	0000	7233A68	0000
						1"	82°			Standard	0.531"	0.161"	Fully Threaded	70,000	ASME B18.3	—	10	91870A622	0000	55525A31	0000	7233A68	0000
						1 1/4"	82°			Standard	0.531"	0.161"	Fully Threaded	70,000	ASME B18.3	—	10	91870A627	0000	55525A31	0000	7233A68	0000
						1 1/2"	82°			Standard	0.531"	0.161"	Fully Threaded	70,000	ASME B18.3	—	10	91870A631	00000	55525A31	0000	7233A68	0000
						1 3/4"	82°			Standard	0.531"	0.161"	Fully Threaded	70,000	ASME B18.3	—	10	91870A731	00000	55525A31	0000	7233A68	0000
						2"	82°			Standard	0.531"	0.161"	Fully Threaded	70,000	ASME B18.3	—	10	91870A638	00000	55525A31	0000	7233A68	0000
						2 1/2"	82°			Standard	0.531"	0.161"	Fully Threaded	70,000	ASME B18.3	—	10	91870A260	00000	55525A31	0000	7233A68	0000




										5/16"-18

										5/8"	82°	Standard	0.656"	0.198"	Fully Threaded	70,000	ASME B18.3	—	10	91870A757	00000	55525A32	0000	7233A71	0000


								3/4"		82°	Standard	0.656"	0.198"	Fully Threaded	70,000	ASME B18.3	—	10	91870A270	00000	55525A32	0000	7233A71	0000
								1"	82°	Standard	0.656"	0.198"	Fully Threaded	70,000	ASME B18.3	—	5	91870A280	00000	55525A32	0000	7233A71	0000
								1 1/4"	82°	Standard	0.656"	0.198"	Fully Threaded	70,000	ASME B18.3	—	5	91870A290	00000	55525A32	0000	7233A71	0000
								1 1/2"	82°	Standard	0.656"	0.198"	Fully Threaded	70,000	ASME B18.3	—	5	91870A310	00000	55525A32	0000	7233A71	0000
								2"	82°	Standard	0.656"	0.198"	Fully Threaded	70,000	ASME B18.3	—	5	91870A758	00000	55525A32	0000	7233A71	0000
								2 1/4"	82°	Standard	0.656"	0.198"	Fully Threaded	70,000	ASME B18.3	—	5	91870A759	00000	55525A32	0000	7233A71	0000
								2 1/2"	82°	Standard	0.656"	0.198"	Fully Threaded	70,000	ASME B18.3	—	5	91870A761	00000	55525A32	0000	7233A71	0000




										3/8"-16

3/4"										82°	Standard	0.781"	0.234"	Fully Threaded	70,000	ASME B18.3	—	5	91870A320	0000	55525A33	0000	7233A72	0000


1"	82°									Standard	0.781"	0.234"	Fully Threaded	70,000	ASME B18.3	—	5	91870A330	0000	55525A33	0000	7233A72	0000
1 1/4"	82°									Standard	0.781"	0.234"	Fully Threaded	70,000	ASME B18.3	—	5	91870A340	00000	55525A33	0000	7233A72	0000
Tamper-Resistant Torx Flat Head Screws, 18-8 Stainless Steel, 3/8"-16 Thread Size, 1-1/4" Long Product Detail QuantityPack of 5In stock Select a compatible file type: Parasolid Compatible Products for This Flat Head Screw
1 1/2"	82°									Standard	0.781"	0.234"	Fully Threaded	70,000	ASME B18.3	—	5	91870A350	00000	55525A33	0000	7233A72	0000
2"	82°									Standard	0.781"	0.234"	Fully Threaded	70,000	ASME B18.3	—	5	91870A763	00000	55525A33	0000	7233A72	0000
2 1/4"	82°									Standard	0.781"	0.234"	Fully Threaded	70,000	ASME B18.3	—	5	91870A764	00000	55525A33	0000	7233A72	0000
2 1/2"	82°									Standard	0.781"	0.234"	Fully Threaded	70,000	ASME B18.3	Material Certificate	5	91870A765	00000	55525A33	0000	7233A72	0000




										M3 × 0.5 mm

		6 mm								90°	Standard	6.70 mm	1.90 mm	Fully Threaded	80,000	ASTM F879M	—	25	91870A360	0000	55525A25	0000	7233A63	0000


		8 mm	90°							Standard	6.70 mm	1.90 mm	Fully Threaded	80,000	ASTM F879M	—	25	91870A390	0000	55525A25	0000	7233A63	0000
		10 mm	90°							Standard	6.70 mm	1.90 mm	Fully Threaded	80,000	ASTM F879M	Material Certificate	25	91870A306	0000	55525A25	0000	7233A63	0000
		12 mm	90°							Standard	6.70 mm	1.90 mm	Fully Threaded	80,000	ASTM F879M	—	25	91870A308	0000	55525A25	0000	7233A63	0000
		16 mm	90°							Standard	6.70 mm	1.90 mm	Fully Threaded	80,000	ASTM F879M	—	25	91870A312	0000	55525A25	0000	7233A63	0000
		20 mm	90°							Standard	6.70 mm	1.90 mm	Fully Threaded	80,000	ASTM F879M	—	25	91870A410	0000	55525A25	0000	7233A63	0000




				M3.5 × 0.6 mm

				6 mm	90°					Standard	8.20 mm	2.30 mm	Fully Threaded	80,000	ASTM F879M	—	25	91870A420	0000	55525A26	0000	7233A64	0000


				8 mm	90°					Standard	8.20 mm	2.30 mm	Fully Threaded	80,000	ASTM F879M	—	25	91870A430	0000	55525A26	0000	7233A64	0000
				10 mm	90°					Standard	8.20 mm	2.30 mm	Fully Threaded	80,000	ASTM F879M	—	25	91870A362	0000	55525A26	0000	7233A64	0000
				12 mm	90°					Standard	8.20 mm	2.30 mm	Fully Threaded	80,000	ASTM F879M	—	25	91870A364	0000	55525A26	0000	7233A64	0000
				20 mm	90°					Standard	8.20 mm	2.30 mm	Fully Threaded	80,000	ASTM F879M	—	25	91870A370	0000	55525A26	0000	7233A64	0000
				25 mm	90°					Standard	8.20 mm	2.30 mm	Fully Threaded	80,000	ASTM F879M	—	25	91870A111	0000	55525A26	0000	7233A64	0000
				30 mm	90°					Standard	8.20 mm	2.30 mm	Fully Threaded	80,000	ASTM F879M	—	25	91870A380	0000	55525A26	0000	7233A64	0000




										M4 × 0.7 mm

										6 mm	90°	Standard	8.90 mm	2.50 mm	Fully Threaded	80,000	ASTM F879M	—	25	91870A440	0000	55525A27	0000	7233A65	0000


						8 mm	90°			Standard	8.90 mm	2.50 mm	Fully Threaded	80,000	ASTM F879M	—	25	91870A450	0000	55525A27	0000	7233A65	0000
						10 mm	90°			Standard	8.90 mm	2.50 mm	Fully Threaded	80,000	ASTM F879M	—	25	91870A406	0000	55525A27	0000	7233A65	0000
						12 mm	90°			Standard	8.90 mm	2.50 mm	Fully Threaded	80,000	ASTM F879M	—	25	91870A408	0000	55525A27	0000	7233A65	0000
						16 mm	90°			Standard	8.90 mm	2.50 mm	Fully Threaded	80,000	ASTM F879M	—	25	91870A412	0000	55525A27	0000	7233A65	0000
						20 mm	90°			Standard	8.90 mm	2.50 mm	Fully Threaded	80,000	ASTM F879M	—	25	91870A416	0000	55525A27	0000	7233A65	0000
						25 mm	90°			Standard	8.90 mm	2.50 mm	Fully Threaded	80,000	ASTM F879M	—	25	91870A470	00000	55525A27	0000	7233A65	0000
						30 mm	90°			Standard	8.90 mm	2.50 mm	Fully Threaded	80,000	ASTM F879M	—	25	91870A426	00000	55525A27	0000	7233A65	0000




										M5 × 0.8 mm

										8 mm	90°	Standard	11.20 mm	3.10 mm	Fully Threaded	80,000	ASTM F879M	—	25	91870A480	0000	55525A28	0000	7233A66	0000


								10 mm	90°	Standard	11.20 mm	3.10 mm	Fully Threaded	80,000	ASTM F879M	—	25	91870A452	0000	55525A28	0000	7233A66	0000
								12 mm	90°	Standard	11.20 mm	3.10 mm	Fully Threaded	80,000	ASTM F879M	—	25	91870A464	0000	55525A28	0000	7233A66	0000
								16 mm	90°	Standard	11.20 mm	3.10 mm	Fully Threaded	80,000	ASTM F879M	—	25	91870A460	0000	55525A28	0000	7233A66	0000
								20 mm	90°	Standard	11.20 mm	3.10 mm	Fully Threaded	80,000	ASTM F879M	—	25	91870A467	00000	55525A28	0000	7233A66	0000
								25 mm	90°	Standard	11.20 mm	3.10 mm	Fully Threaded	80,000	ASTM F879M	—	25	91870A490	00000	55525A28	0000	7233A66	0000
								30 mm	90°	Standard	11.20 mm	3.10 mm	Fully Threaded	80,000	ASTM F879M	—	25	91870A475	00000	55525A28	0000	7233A66	0000
								40 mm	90°	Standard	11.20 mm	3.10 mm	Fully Threaded	80,000	ASTM F879M	—	10	91870A113	0000	55525A28	0000	7233A66	0000
								50 mm	90°	Standard	11.20 mm	3.10 mm	Fully Threaded	80,000	ASTM F879M	—	10	91870A114	0000	55525A28	0000	7233A66	0000
								60 mm	90°	Standard	11.20 mm	3.10 mm	Fully Threaded	80,000	ASTM F879M	—	10	91870A115	0000	55525A28	0000	7233A66	0000




	M6 × 1 mm

	10 mm								90°	Standard	13.40 mm	3.70 mm	Fully Threaded	80,000	ASTM F879M	—	10	91870A510	0000	55525A31	0000	7233A68	0000


	12 mm								90°	Standard	13.40 mm	3.70 mm	Fully Threaded	80,000	ASTM F879M	—	10	91870A521	0000	55525A31	0000	7233A68	0000
	16 mm								90°	Standard	13.40 mm	3.70 mm	Fully Threaded	80,000	ASTM F879M	—	10	91870A523	0000	55525A31	0000	7233A68	0000
	20 mm								90°	Standard	13.40 mm	3.70 mm	Fully Threaded	80,000	ASTM F879M	—	10	91870A528	0000	55525A31	0000	7233A68	0000
	25 mm								90°	Standard	13.40 mm	3.70 mm	Fully Threaded	80,000	ASTM F879M	—	10	91870A520	0000	55525A31	0000	7233A68	0000
	30 mm								90°	Standard	13.40 mm	3.70 mm	Fully Threaded	80,000	ASTM F879M	—	10	91870A534	0000	55525A31	0000	7233A68	0000
	40 mm								90°	Standard	13.40 mm	3.70 mm	Fully Threaded	80,000	ASTM F879M	—	10	91870A540	0000	55525A31	0000	7233A68	0000
	50 mm								90°	Standard	13.40 mm	3.70 mm	Fully Threaded	80,000	ASTM F879M	—	10	91870A116	0000	55525A31	0000	7233A68	0000
	60 mm								90°	Standard	13.40 mm	3.70 mm	Fully Threaded	80,000	ASTM F879M	—	10	91870A117	00000	55525A31	0000	7233A68	0000




			M8 × 1.25 mm

			16 mm						90°	Standard	17.90 mm	5.00 mm	Fully Threaded	80,000	ASTM F879M	—	10	91870A530	0000	55525A33	0000	7233A72	0000


			20 mm						90°	Standard	17.90 mm	5.00 mm	Fully Threaded	80,000	ASTM F879M	—	10	91870A550	00000	55525A33	0000	7233A72	0000
			25 mm						90°	Standard	17.90 mm	5.00 mm	Fully Threaded	80,000	ASTM F879M	—	10	91870A560	00000	55525A33	0000	7233A72	0000
			30 mm						90°	Standard	17.90 mm	5.00 mm	Fully Threaded	80,000	ASTM F879M	—	10	91870A570	00000	55525A33	0000	7233A72	0000