ASTM F879M Flat Head Screws

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Thread Size

M3.5

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Tamper-Resistant Hex

Tamper-Resistant Torx

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Material

Flat Head Profile

Head Diameter

Head Height

Countersink Angle

Thread Pitch

Drive Size

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Specifications Met

Performance

Tip Type

Threading

Thread Fit

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Tensile Strength

70,000 psi to 99,999 psi

REACH

Compliant

Hardness

Rockwell B96

RoHS

Compliant

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

Yes

Export Control Classification Number (ECCN)

EAR99

DFARS Specialty Metals

Not Compliant

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85 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.

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, mm
	Lg., mm	Countersink Angle	Flat Head Profile	Dia.	Ht.	Threading	Tensile Strength, psi	Specs. Met	Certificate Type	Pkg. Qty.		Pkg.		Each		Each
18-8 Stainless Steel







				M3 × 0.5 mm

				6	90°	Standard	6.70	1.90	Fully Threaded	80,000	ASTM F879M	—	25	91870A360	00000	55525A25	00000	7233A63	00000


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




						M3.5 × 0.6 mm

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


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




								M4 × 0.7 mm

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


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




										M5 × 0.8 mm

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


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




		M6 × 1 mm

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


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




				M8 × 1.25 mm

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


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

Tamper-Resistant Hex-Drive Stainless Steel Flat Head Screws

Image of Product. Front orientation. Contains Annotated, MultipleImages. Flat Head Screws. Tamper-Resistant Hex-Drive Stainless Steel Flat Head Screws.

Prevent unauthorized access and damage to components. These screws have a security pin in the drive that you can only turn with a tamper-resistant hex driver. Also known as pin-in-hex and pin-in-socket drives, the deep six-point opening helps them withstand torque without damaging the drive. Made of stainless steel, they won't rust or corrode when exposed to moisture and chemicals.

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.

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

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







				M3 × 0.5 mm

				6	90°	Standard	6.71	1.85	Fully Threaded	80,000	ASTM F879M	50	90517A150	000000	7240A31	00000


				8	90°	Standard	6.71	1.85	Fully Threaded	80,000	ASTM F879M	50	90517A160	00000	7240A31	0000
				10	90°	Standard	6.71	1.85	Fully Threaded	80,000	ASTM F879M	50	90517A170	00000	7240A31	0000
				12	90°	Standard	6.71	1.85	Fully Threaded	80,000	ASTM F879M	50	90517A180	00000	7240A31	0000




						M4 × 0.7 mm

						6	90°	Standard	8.94	2.48	Fully Threaded	80,000	ASTM F879M	25	90517A190	0000	7240A35	0000


						8	90°	Standard	8.94	2.48	Fully Threaded	80,000	ASTM F879M	25	90517A210	0000	7240A35	0000
						10	90°	Standard	8.94	2.48	Fully Threaded	80,000	ASTM F879M	25	90517A220	0000	7240A35	0000
						12	90°	Standard	8.94	2.48	Fully Threaded	80,000	ASTM F879M	25	90517A230	0000	7240A35	0000
						16	90°	Standard	8.94	2.48	Fully Threaded	80,000	ASTM F879M	25	90517A240	0000	7240A35	0000




								M5 × 0.8 mm

								8	90°	Standard	11.2	3.10	Fully Threaded	80,000	ASTM F879M	25	90517A250	0000	7240A35	0000


								10	90°	Standard	11.2	3.10	Fully Threaded	80,000	ASTM F879M	25	90517A260	00000	7240A35	0000
								12	90°	Standard	11.2	3.10	Fully Threaded	80,000	ASTM F879M	25	90517A270	00000	7240A35	0000
								16	90°	Standard	11.2	3.10	Fully Threaded	80,000	ASTM F879M	25	90517A280	00000	7240A35	0000
								20	90°	Standard	11.2	3.10	Fully Threaded	80,000	ASTM F879M	25	90517A290	00000	7240A35	0000




										M6 × 1 mm

										12	90°	Standard	13.44	3.72	Fully Threaded	80,000	ASTM F879M	10	90517A310	0000	7240A35	0000


										16	90°	Standard	13.44	3.72	Fully Threaded	80,000	ASTM F879M	10	90517A320	0000	7240A35	0000
										20	90°	Standard	13.44	3.72	Fully Threaded	80,000	ASTM F879M	10	90517A330	0000	7240A35	0000
										25	90°	Standard	13.44	3.72	Fully Threaded	80,000	ASTM F879M	10	90517A340	0000	7240A35	0000
										30	90°	Standard	13.44	3.72	Fully Threaded	80,000	ASTM F879M	10	90517A350	0000	7240A35	0000




												M8 × 1.25 mm

												16	90°	Standard	17.91	4.95	Fully Threaded	80,000	ASTM F879M	10	90517A360	00000	7240A36	0000


												20	90°	Standard	17.91	4.95	Fully Threaded	80,000	ASTM F879M	10	90517A370	00000	7240A36	0000
25												90°	Standard	17.91	4.95	Fully Threaded	80,000	ASTM F879M	10	90517A380	00000	7240A36	0000
30	90°											Standard	17.91	4.95	Fully Threaded	80,000	ASTM F879M	10	90517A390	00000	7240A36	0000