91900A161 | Rounded Head Screw

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Tamper-Resistant Torx

Material

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Rounded Head Style

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Head Height

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Specifications Met

Thread Type

Drive Size

Thread Direction

Rounded Head Profile

Thread Spacing

Tip Type

Tensile Strength

60,000 psi to 79,999 psi

80,000 psi to 99,999 psi

100,000 psi to 119,999 psi

120,000 psi or greater

Not Rated

DFARS Specialty Metals

Thread Fit

Unified Standard Class 2A

Unified Standard Class 3A

Not Rated

RoHS

Compliant

Compliant with Exemptions

Not Compliant

REACH

Compliant

Not Compliant

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

Export Control Classification Number (ECCN)

10,444 Products

Tamper-Resistant Torx Stainless Steel Button Head Screws

Deter unauthorized access in corrosive environments. 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 the driver slipping and stripping the drive. Made of stainless steel, these screws won't rust, but they're not as strong as alloy steel. The button head looks similar to a pan head, but it's lower and more compact, taking up less space.

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.

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.	Dia.	Ht.	Threading	Tensile Strength, psi	Specs. Met	Certificate Type	Pkg. Qty.		Pkg.		Each		Each
18-8 Stainless Steel







				4-40

				3/16"	0.213"	0.059"	Fully Threaded	70,000	ASME B18.3	—	50	91900A105	000000	55525A23	00000	7233A61	00000


				1/4"	0.213"	0.059"	Fully Threaded	70,000	ASME B18.3	Material Certificate	25	91900A106	00000	55525A23	0000	7233A61	0000
				5/16"	0.213"	0.059"	Fully Threaded	70,000	ASME B18.3	—	25	91900A911	0000	55525A23	0000	7233A61	0000
				3/8"	0.213"	0.059"	Fully Threaded	70,000	ASME B18.3	—	25	91900A169	0000	55525A23	0000	7233A61	0000
				1/2"	0.213"	0.059"	Fully Threaded	70,000	ASME B18.3	Material Certificate	25	91900A110	00000	55525A23	0000	7233A61	0000
				3/4"	0.213"	0.059"	Fully Threaded	70,000	ASME B18.3	—	50	91900A111	00000	55525A23	0000	7233A61	0000
				1"	0.213"	0.059"	Fully Threaded	70,000	ASME B18.3	—	25	91900A912	00000	55525A23	0000	7233A61	0000




						6-32

						3/16"	0.262"	0.073"	Fully Threaded	70,000	ASME B18.3	—	50	91900A143	00000	55525A25	0000	7233A63	0000


						1/4"	0.262"	0.073"	Fully Threaded	70,000	ASME B18.3	Material Certificate	25	91900A144	0000	55525A25	0000	7233A63	0000
						5/16"	0.262"	0.073"	Fully Threaded	70,000	ASME B18.3	—	50	91900A145	00000	55525A25	0000	7233A63	0000
						3/8"	0.262"	0.073"	Fully Threaded	70,000	ASME B18.3	Material Certificate	25	91900A146	00000	55525A25	0000	7233A63	0000
						1/2"	0.262"	0.073"	Fully Threaded	70,000	ASME B18.3	Material Certificate	25	91900A148	00000	55525A25	0000	7233A63	0000
						5/8"	0.262"	0.073"	Fully Threaded	70,000	ASME B18.3	Material Certificate	25	91900A913	00000	55525A25	0000	7233A63	0000
						3/4"	0.262"	0.073"	Fully Threaded	70,000	ASME B18.3	Material Certificate	25	91900A151	00000	55525A25	0000	7233A63	0000
						1"	0.262"	0.073"	Fully Threaded	70,000	ASME B18.3	—	25	91900A153	00000	55525A25	0000	7233A63	0000
						1 1/2"	0.262"	0.073"	Fully Threaded	70,000	ASME B18.3	—	25	91900A914	00000	55525A25	0000	7233A63	0000




								8-32

								3/16"	0.312"	0.087"	Fully Threaded	70,000	ASME B18.3	—	50	91900A200	00000	55525A26	0000	7233A64	0000


								1/4"	0.312"	0.087"	Fully Threaded	70,000	ASME B18.3	—	25	91900A171	0000	55525A26	0000	7233A64	0000
								5/16"	0.312"	0.087"	Fully Threaded	70,000	ASME B18.3	—	25	91900A201	0000	55525A26	0000	7233A64	0000
								3/8"	0.312"	0.087"	Fully Threaded	70,000	ASME B18.3	Material Certificate	25	91900A192	00000	55525A26	0000	7233A64	0000
								1/2"	0.312"	0.087"	Fully Threaded	70,000	ASME B18.3	Material Certificate	25	91900A194	00000	55525A26	0000	7233A64	0000
								5/8"	0.312"	0.087"	Fully Threaded	70,000	ASME B18.3	Material Certificate	25	91900A202	00000	55525A26	0000	7233A64	0000
								3/4"	0.312"	0.087"	Fully Threaded	70,000	ASME B18.3	Material Certificate	25	91900A197	00000	55525A26	0000	7233A64	0000
								1"	0.312"	0.087"	Fully Threaded	70,000	ASME B18.3	—	25	91900A199	00000	55525A26	0000	7233A64	0000
								1 1/4"	0.312"	0.087"	Fully Threaded	70,000	ASME B18.3	—	25	91900A172	00000	55525A26	0000	7233A64	0000
								1 1/2"	0.312"	0.087"	Fully Threaded	70,000	ASME B18.3	Material Certificate	25	91900A203	00000	55525A26	0000	7233A64	0000
								1 3/4"	0.312"	0.087"	Fully Threaded	70,000	ASME B18.3	—	10	91900A915	0000	55525A26	0000	7233A64	0000


								2"	0.312"	0.087"	Fully Threaded	70,000	ASME B18.3	Material Certificate	10	91900A204	0000	55525A26	0000	7233A64	0000




										10-24

										1/4"	0.361"	0.101"	Fully Threaded	70,000	ASME B18.3	—	25	91900A162	0000	55525A28	0000	7233A66	0000


3/8"	0.361"									0.101"	Fully Threaded	70,000	ASME B18.3	—	25	91900A163	0000	55525A28	0000	7233A66	0000
1/2"	0.361"									0.101"	Fully Threaded	70,000	ASME B18.3	—	25	91900A242	00000	55525A28	0000	7233A66	0000
5/8"	0.361"									0.101"	Fully Threaded	70,000	ASME B18.3	Material Certificate	25	91900A164	00000	55525A28	0000	7233A66	0000
3/4"	0.361"	0.101"								Fully Threaded	70,000	ASME B18.3	—	25	91900A245	00000	55525A28	0000	7233A66	0000
1"	0.361"	0.101"	Fully Threaded							70,000	ASME B18.3	Material Certificate	25	91900A247	00000	55525A28	0000	7233A66	0000
1 1/4"	0.361"	0.101"	Fully Threaded							70,000	ASME B18.3	—	10	91900A249	00000	55525A28	0000	7233A66	0000
1 1/2"	0.361"	0.101"	Fully Threaded							70,000	ASME B18.3	Material Certificate	10	91900A165	0000	55525A28	0000	7233A66	0000
1 3/4"	0.361"	0.101"	Fully Threaded							70,000	ASME B18.3	—	10	91900A916	0000	55525A28	0000	7233A66	0000




		10-32

		3/16"	0.361"							0.101"	Fully Threaded	70,000	ASME B18.3	—	25	91900A917	00000	55525A28	0000	7233A66	0000


		1/4"	0.361"							0.101"	Fully Threaded	70,000	ASME B18.3	—	25	91900A260	00000	55525A28	0000	7233A66	0000
		3/8"	0.361"							0.101"	Fully Threaded	70,000	ASME B18.3	—	10	91900A827	0000	55525A28	0000	7233A66	0000
		1/2"	0.361"	0.101"						Fully Threaded	70,000	ASME B18.3	Material Certificate	25	91900A829	00000	55525A28	0000	7233A66	0000
		5/8"	0.361"	0.101"	Fully Threaded					70,000	ASME B18.3	Material Certificate	25	91900A166	00000	55525A28	0000	7233A66	0000
		3/4"	0.361"	0.101"	Fully Threaded					70,000	ASME B18.3	Material Certificate	25	91900A831	00000	55525A28	0000	7233A66	0000
		1"	0.361"	0.101"	Fully Threaded					70,000	ASME B18.3	Material Certificate	25	91900A833	00000	55525A28	0000	7233A66	0000
		1 1/4"	0.361"	0.101"	Fully Threaded					70,000	ASME B18.3	Material Certificate	10	91900A167	0000	55525A28	0000	7233A66	0000
		1 1/2"	0.361"	0.101"	Fully Threaded					70,000	ASME B18.3	—	10	91900A168	0000	55525A28	0000	7233A66	0000
		2"	0.361"	0.101"	Fully Threaded					70,000	ASME B18.3	—	10	91900A270	0000	55525A28	0000	7233A66	0000




				12-24

				1/2"	0.413"					0.114"	Fully Threaded	70,000	ASME B18.3	—	10	91900A918	0000	55525A28	0000	7233A66	0000


				3/4"	0.413"					0.114"	Fully Threaded	70,000	ASME B18.3	—	10	91900A919	0000	55525A28	0000	7233A66	0000




						1/4"-20

						1/4"	0.437"			0.132"	Fully Threaded	70,000	ASME B18.3	—	25	91900A535	00000	55525A29	0000	7233A67	0000


						3/8"	0.437"			0.132"	Fully Threaded	70,000	ASME B18.3	—	10	91900A536	0000	55525A29	0000	7233A67	0000
						1/2"	0.437"			0.132"	Fully Threaded	70,000	ASME B18.3	Material Certificate	10	91900A537	0000	55525A29	0000	7233A67	0000
						5/8"	0.437"			0.132"	Fully Threaded	70,000	ASME B18.3	Material Certificate	10	91900A161	0000	55525A29	0000	7233A67	0000
						Stainless Steel Tamper-Resistant Button Head Torx Screws, 1/4"-20 Thread Size, 5/8" Long Product Detail QuantityPack of 10In stock Select a compatible file type: Parasolid Compatible Products for This Rounded Head Screw
						3/4"	0.437"			0.132"	Fully Threaded	70,000	ASME B18.3	Material Certificate	10	91900A540	0000	55525A29	0000	7233A67	0000
						1"	0.437"			0.132"	Fully Threaded	70,000	ASME B18.3	—	10	91900A542	0000	55525A29	0000	7233A67	0000
						1 1/4"	0.437"			0.132"	Fully Threaded	70,000	ASME B18.3	—	10	91900A544	00000	55525A29	0000	7233A67	0000
						1 1/2"	0.437"			0.132"	Fully Threaded	70,000	ASME B18.3	Material Certificate	10	91900A546	00000	55525A29	0000	7233A67	0000
						1 3/4"	0.437"			0.132"	Fully Threaded	70,000	ASME B18.3	Material Certificate	10	91900A550	00000	55525A29	0000	7233A67	0000
						2"	0.437"			0.132"	Fully Threaded	70,000	ASME B18.3	—	5	91900A549	0000	55525A29	0000	7233A67	0000
						2 1/4"	0.437"			0.132"	Fully Threaded	70,000	ASME B18.3	Material Certificate	10	91900A921	00000	55525A29	0000	7233A67	0000


						2 1/2"	0.437"			0.132"	Fully Threaded	70,000	ASME B18.3	—	10	91900A551	00000	55525A29	0000	7233A67	0000
						3"	0.437"			0.132"	Fully Threaded	70,000	ASME B18.3	—	10	91900A552	00000	55525A29	0000	7233A67	0000




								1/4"-28

								1/2"	0.437"	0.132"	Fully Threaded	70,000	ASME B18.3	Material Certificate	10	91900A570	0000	55525A29	0000	7233A67	0000


								3/4"	0.437"	0.132"	Fully Threaded	70,000	ASME B18.3	—	10	91900A571	0000	55525A29	0000	7233A67	0000
								1"	0.437"	0.132"	Fully Threaded	70,000	ASME B18.3	—	10	91900A572	0000	55525A29	0000	7233A67	0000




	5/16"-18

	1/2"								0.547"	0.166"	Fully Threaded	70,000	ASME B18.3	—	10	91900A607	00000	55525A32	0000	7233A71	0000


	5/8"								0.547"	0.166"	Fully Threaded	70,000	ASME B18.3	—	10	91900A922	0000	55525A32	0000	7233A71	0000
	3/4"								0.547"	0.166"	Fully Threaded	70,000	ASME B18.3	Material Certificate	5	91900A605	0000	55525A32	0000	7233A71	0000
	1"								0.547"	0.166"	Fully Threaded	70,000	ASME B18.3	Material Certificate	5	91900A608	0000	55525A32	0000	7233A71	0000
	1 1/4"								0.547"	0.166"	Fully Threaded	70,000	ASME B18.3	—	5	91900A611	0000	55525A32	0000	7233A71	0000
	1 1/2"								0.547"	0.166"	Fully Threaded	70,000	ASME B18.3	Material Certificate	5	91900A614	0000	55525A32	0000	7233A71	0000
	1 3/4"								0.547"	0.166"	Fully Threaded	70,000	ASME B18.3	Material Certificate	5	91900A923	0000	55525A32	0000	7233A71	0000
	2"								0.547"	0.166"	Fully Threaded	70,000	ASME B18.3	—	5	91900A615	00000	55525A32	0000	7233A71	0000




										3/8"-16

		1/2"								0.656"	0.199"	Fully Threaded	70,000	ASME B18.3	—	10	91900A649	00000	55525A33	0000	7233A72	0000


		5/8"	0.656"							0.199"	Fully Threaded	70,000	ASME B18.3	—	5	91900A924	0000	55525A33	0000	7233A72	0000
		3/4"	0.656"							0.199"	Fully Threaded	70,000	ASME B18.3	—	5	91900A650	00000	55525A33	0000	7233A72	0000
		1"	0.656"							0.199"	Fully Threaded	70,000	ASME B18.3	Material Certificate	5	91900A653	00000	55525A33	0000	7233A72	0000
		1 1/4"	0.656"							0.199"	Fully Threaded	70,000	ASME B18.3	—	5	91900A656	00000	55525A33	0000	7233A72	0000
		1 1/2"	0.656"							0.199"	Fully Threaded	70,000	ASME B18.3	Material Certificate	5	91900A659	00000	55525A33	0000	7233A72	0000
		2"	0.656"							0.199"	Fully Threaded	70,000	ASME B18.3	—	5	91900A660	00000	55525A33	0000	7233A72	0000
		2 1/2"	0.656"							0.199"	Fully Threaded	70,000	ASME B18.3	Material Certificate	5	91900A925	00000	55525A33	0000	7233A72	0000




				M3 × 0.5 mm

				6 mm	5.69 mm					1.65 mm	Fully Threaded	80,000	ASTM F879M, ISO 7380	—	50	91900A846	00000	55525A23	0000	7233A61	0000


				8 mm	5.69 mm					1.65 mm	Fully Threaded	80,000	ASTM F879M, ISO 7380	Material Certificate	50	91900A847	00000	55525A23	0000	7233A61	0000
				10 mm	5.69 mm					1.65 mm	Fully Threaded	80,000	ASTM F879M, ISO 7380	Material Certificate	50	91900A848	00000	55525A23	0000	7233A61	0000
				12 mm	5.69 mm					1.65 mm	Fully Threaded	80,000	ASTM F879M, ISO 7380	—	50	91900A849	00000	55525A23	0000	7233A61	0000
				16 mm	5.69 mm					1.65 mm	Fully Threaded	80,000	ASTM F879M, ISO 7380	—	50	91900A301	00000	55525A23	0000	7233A61	0000




										M4 × 0.7 mm

										10 mm	7.6 mm	2.18 mm	Fully Threaded	80,000	ASTM F879M, ISO 7380	Material Certificate	25	91900A851	0000	55525A26	0000	7233A64	0000


										12 mm	7.6 mm	2.18 mm	Fully Threaded	80,000	ASTM F879M, ISO 7380	Material Certificate	25	91900A852	0000	55525A26	0000	7233A64	0000
										16 mm	7.6 mm	2.18 mm	Fully Threaded	80,000	ASTM F879M, ISO 7380	—	25	91900A853	0000	55525A26	0000	7233A64	0000
										20 mm	7.6 mm	2.18 mm	Fully Threaded	80,000	ASTM F879M, ISO 7380	Material Certificate	25	91900A302	00000	55525A26	0000	7233A64	0000
						25 mm				7.6 mm	2.18 mm	Fully Threaded	80,000	ASTM F879M, ISO 7380	—	25	91900A303	00000	55525A26	0000	7233A64	0000
						30 mm	7.6 mm			2.18 mm	Fully Threaded	80,000	ASTM F879M, ISO 7380	—	25	91900A304	00000	55525A26	0000	7233A64	0000
						40 mm	7.6 mm			2.18 mm	Fully Threaded	80,000	ASTM F879M, ISO 7380	Material Certificate	25	91900A305	00000	55525A26	0000	7233A64	0000




										M5 × 0.8 mm

										8 mm	9.5 mm	2.74 mm	Fully Threaded	80,000	ASTM F879M, ISO 7380	—	25	91900A854	0000	55525A28	0000	7233A66	0000


10 mm								9.5 mm		2.74 mm	Fully Threaded	80,000	ASTM F879M, ISO 7380	Material Certificate	25	91900A855	00000	55525A28	0000	7233A66	0000
12 mm								9.5 mm		2.74 mm	Fully Threaded	80,000	ASTM F879M, ISO 7380	Material Certificate	25	91900A856	00000	55525A28	0000	7233A66	0000
16 mm								9.5 mm		2.74 mm	Fully Threaded	80,000	ASTM F879M, ISO 7380	Material Certificate	25	91900A857	00000	55525A28	0000	7233A66	0000
20 mm								9.5 mm		2.74 mm	Fully Threaded	80,000	ASTM F879M, ISO 7380	Material Certificate	25	91900A858	00000	55525A28	0000	7233A66	0000
25 mm								9.5 mm		2.74 mm	Fully Threaded	80,000	ASTM F879M, ISO 7380	Material Certificate	25	91900A306	00000	55525A28	0000	7233A66	0000
30 mm								9.5 mm		2.74 mm	Fully Threaded	80,000	ASTM F879M, ISO 7380	—	25	91900A307	00000	55525A28	0000	7233A66	0000
40 mm								9.5 mm		2.74 mm	Fully Threaded	80,000	ASTM F879M, ISO 7380	—	10	91900A308	0000	55525A28	0000	7233A66	0000
50 mm								9.5 mm		2.74 mm	Fully Threaded	80,000	ASTM F879M, ISO 7380	—	10	91900A309	0000	55525A28	0000	7233A66	0000
60 mm								9.5 mm		2.74 mm	Fully Threaded	80,000	ASTM F879M, ISO 7380	—	10	91900A311	0000	55525A28	0000	7233A66	0000




	M6 × 1 mm

	10 mm									10.5 mm	3.28 mm	Fully Threaded	80,000	ASTM F879M, ISO 7380	—	25	91900A859	00000	55525A29	0000	7233A67	0000


	12 mm								10.5 mm	3.28 mm	Fully Threaded	80,000	ASTM F879M, ISO 7380	Material Certificate	25	91900A861	00000	55525A29	0000	7233A67	0000
	16 mm								10.5 mm	3.28 mm	Fully Threaded	80,000	ASTM F879M, ISO 7380	Material Certificate	10	91900A862	0000	55525A29	0000	7233A67	0000
	20 mm								10.5 mm	3.28 mm	Fully Threaded	80,000	ASTM F879M, ISO 7380	Material Certificate	10	91900A863	0000	55525A29	0000	7233A67	0000
	25 mm								10.5 mm	3.28 mm	Fully Threaded	80,000	ASTM F879M, ISO 7380	—	10	91900A864	0000	55525A29	0000	7233A67	0000
	30 mm								10.5 mm	3.28 mm	Fully Threaded	80,000	ASTM F879M, ISO 7380	—	10	91900A312	0000	55525A29	0000	7233A67	0000
	40 mm								10.5 mm	3.28 mm	Fully Threaded	80,000	ASTM F879M, ISO 7380	—	10	91900A313	00000	55525A29	0000	7233A67	0000
	50 mm								10.5 mm	3.28 mm	Fully Threaded	80,000	ASTM F879M, ISO 7380	—	10	91900A314	00000	55525A29	0000	7233A67	0000
	60 mm								10.5 mm	3.28 mm	Fully Threaded	80,000	ASTM F879M, ISO 7380	—	10	91900A315	00000	55525A29	0000	7233A67	0000




		M8 × 1.25 mm

		12 mm	14 mm							4.39 mm	Fully Threaded	80,000	ASTM F879M, ISO 7380	Material Certificate	10	91900A865	00000	55525A32	0000	7233A71	0000


		16 mm	14 mm							4.39 mm	Fully Threaded	80,000	ASTM F879M, ISO 7380	—	10	91900A866	00000	55525A32	0000	7233A71	0000
		20 mm	14 mm							4.39 mm	Fully Threaded	80,000	ASTM F879M, ISO 7380	—	10	91900A867	00000	55525A32	0000	7233A71	0000
		25 mm	14 mm							4.39 mm	Fully Threaded	80,000	ASTM F879M, ISO 7380	—	10	91900A868	00000	55525A32	0000	7233A71	0000
		30 mm	14 mm							4.39 mm	Fully Threaded	80,000	ASTM F879M, ISO 7380	—	10	91900A869	00000	55525A32	0000	7233A71	0000




										M10 × 1.5 mm

				20 mm	17.5 mm					5.5 mm	Fully Threaded	80,000	ASTM F879M, ISO 7380	—	5	91900A871	0000	55525A33	0000	7233A72	0000


				25 mm	17.5 mm					5.5 mm	Fully Threaded	80,000	ASTM F879M, ISO 7380	—	5	91900A872	0000	55525A33	0000	7233A72	0000
				30 mm	17.5 mm					5.5 mm	Fully Threaded	80,000	ASTM F879M, ISO 7380	—	5	91900A873	00000	55525A33	0000	7233A72	0000