ASTM F879M Screws | McMaster-Carr

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178 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, mm
	Lg., mm	Dia.	Ht.	Threading	Tensile Strength, psi	Specs. Met	Pkg. Qty.		Pkg.		Each		Each
18-8 Stainless Steel







				M3 × 0.5 mm

				6	5.69	1.65	Fully Threaded	80,000	ASTM F879M, ISO 7380	50	000000000	000000	00000000	00000	0000000	00000


				8	5.69	1.65	Fully Threaded	80,000	ASTM F879M, ISO 7380	50	000000000	00000	00000000	0000	0000000	0000
				10	5.69	1.65	Fully Threaded	80,000	ASTM F879M, ISO 7380	50	000000000	00000	00000000	0000	0000000	0000
				12	5.69	1.65	Fully Threaded	80,000	ASTM F879M, ISO 7380	50	000000000	00000	00000000	0000	0000000	0000
				16	5.69	1.65	Fully Threaded	80,000	ASTM F879M, ISO 7380	50	000000000	00000	00000000	0000	0000000	0000




						M4 × 0.7 mm

						10	7.6	2.18	Fully Threaded	80,000	ASTM F879M, ISO 7380	25	000000000	0000	00000000	0000	0000000	0000


						12	7.6	2.18	Fully Threaded	80,000	ASTM F879M, ISO 7380	25	000000000	0000	00000000	0000	0000000	0000
						16	7.6	2.18	Fully Threaded	80,000	ASTM F879M, ISO 7380	25	000000000	0000	00000000	0000	0000000	0000
						20	7.6	2.18	Fully Threaded	80,000	ASTM F879M, ISO 7380	25	000000000	00000	00000000	0000	0000000	0000
						25	7.6	2.18	Fully Threaded	80,000	ASTM F879M, ISO 7380	25	000000000	00000	00000000	0000	0000000	0000
						30	7.6	2.18	Fully Threaded	80,000	ASTM F879M, ISO 7380	25	000000000	00000	00000000	0000	0000000	0000
						40	7.6	2.18	Fully Threaded	80,000	ASTM F879M, ISO 7380	25	000000000	00000	00000000	0000	0000000	0000




								M5 × 0.8 mm

								8	9.5	2.74	Fully Threaded	80,000	ASTM F879M, ISO 7380	25	000000000	0000	00000000	0000	0000000	0000


								10	9.5	2.74	Fully Threaded	80,000	ASTM F879M, ISO 7380	25	000000000	00000	00000000	0000	0000000	0000
								12	9.5	2.74	Fully Threaded	80,000	ASTM F879M, ISO 7380	25	000000000	00000	00000000	0000	0000000	0000
								16	9.5	2.74	Fully Threaded	80,000	ASTM F879M, ISO 7380	25	000000000	00000	00000000	0000	0000000	0000
								20	9.5	2.74	Fully Threaded	80,000	ASTM F879M, ISO 7380	25	000000000	00000	00000000	0000	0000000	0000
								25	9.5	2.74	Fully Threaded	80,000	ASTM F879M, ISO 7380	25	000000000	00000	00000000	0000	0000000	0000
								30	9.5	2.74	Fully Threaded	80,000	ASTM F879M, ISO 7380	25	000000000	00000	00000000	0000	0000000	0000
								40	9.5	2.74	Fully Threaded	80,000	ASTM F879M, ISO 7380	10	000000000	0000	00000000	0000	0000000	0000
								50	9.5	2.74	Fully Threaded	80,000	ASTM F879M, ISO 7380	10	000000000	0000	00000000	0000	0000000	0000
								60	9.5	2.74	Fully Threaded	80,000	ASTM F879M, ISO 7380	10	000000000	0000	00000000	0000	0000000	0000




										M6 × 1 mm

										10	10.5	3.28	Fully Threaded	80,000	ASTM F879M, ISO 7380	25	000000000	00000	00000000	0000	0000000	0000


										12	10.5	3.28	Fully Threaded	80,000	ASTM F879M, ISO 7380	25	000000000	00000	00000000	0000	0000000	0000
										16	10.5	3.28	Fully Threaded	80,000	ASTM F879M, ISO 7380	10	000000000	0000	00000000	0000	0000000	0000
										20	10.5	3.28	Fully Threaded	80,000	ASTM F879M, ISO 7380	10	000000000	0000	00000000	0000	0000000	0000
										25	10.5	3.28	Fully Threaded	80,000	ASTM F879M, ISO 7380	10	000000000	0000	00000000	0000	0000000	0000
										30	10.5	3.28	Fully Threaded	80,000	ASTM F879M, ISO 7380	10	000000000	0000	00000000	0000	0000000	0000
										40	10.5	3.28	Fully Threaded	80,000	ASTM F879M, ISO 7380	10	000000000	00000	00000000	0000	0000000	0000
50										10.5	3.28	Fully Threaded	80,000	ASTM F879M, ISO 7380	10	000000000	00000	00000000	0000	0000000	0000
60	10.5									3.28	Fully Threaded	80,000	ASTM F879M, ISO 7380	10	000000000	00000	00000000	0000	0000000	0000




		M8 × 1.25 mm

		12	14							4.39	Fully Threaded	80,000	ASTM F879M, ISO 7380	10	000000000	00000	00000000	0000	0000000	0000


		16	14							4.39	Fully Threaded	80,000	ASTM F879M, ISO 7380	10	000000000	00000	00000000	0000	0000000	0000
		20	14							4.39	Fully Threaded	80,000	ASTM F879M, ISO 7380	10	000000000	00000	00000000	0000	0000000	0000
		25	14							4.39	Fully Threaded	80,000	ASTM F879M, ISO 7380	10	000000000	00000	00000000	0000	0000000	0000
		30	14							4.39	Fully Threaded	80,000	ASTM F879M, ISO 7380	10	000000000	00000	00000000	0000	0000000	0000




				M10 × 1.5 mm

				20	17.5					5.5	Fully Threaded	80,000	ASTM F879M, ISO 7380	5	000000000	0000	00000000	0000	0000000	0000


				25	17.5					5.5	Fully Threaded	80,000	ASTM F879M, ISO 7380	5	000000000	0000	00000000	0000	0000000	0000
				30	17.5					5.5	Fully Threaded	80,000	ASTM F879M, ISO 7380	5	000000000	00000	00000000	0000	0000000	0000

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	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	000000000	00000	00000000	00000	0000000	00000


				8	90°	Standard	6.70	1.90	Fully Threaded	80,000	ASTM F879M	25	000000000	0000	00000000	0000	0000000	0000
				10	90°	Standard	6.70	1.90	Fully Threaded	80,000	ASTM F879M	25	000000000	0000	00000000	0000	0000000	0000
				12	90°	Standard	6.70	1.90	Fully Threaded	80,000	ASTM F879M	25	000000000	0000	00000000	0000	0000000	0000
				16	90°	Standard	6.70	1.90	Fully Threaded	80,000	ASTM F879M	25	000000000	0000	00000000	0000	0000000	0000
				20	90°	Standard	6.70	1.90	Fully Threaded	80,000	ASTM F879M	25	000000000	0000	00000000	0000	0000000	0000




						M3.5 × 0.6 mm

						6	90°	Standard	8.20	2.30	Fully Threaded	80,000	ASTM F879M	25	000000000	0000	00000000	0000	0000000	0000


						8	90°	Standard	8.20	2.30	Fully Threaded	80,000	ASTM F879M	25	000000000	0000	00000000	0000	0000000	0000
						10	90°	Standard	8.20	2.30	Fully Threaded	80,000	ASTM F879M	25	000000000	0000	00000000	0000	0000000	0000
						12	90°	Standard	8.20	2.30	Fully Threaded	80,000	ASTM F879M	25	000000000	0000	00000000	0000	0000000	0000
						20	90°	Standard	8.20	2.30	Fully Threaded	80,000	ASTM F879M	25	000000000	0000	00000000	0000	0000000	0000
						25	90°	Standard	8.20	2.30	Fully Threaded	80,000	ASTM F879M	25	000000000	0000	00000000	0000	0000000	0000
						30	90°	Standard	8.20	2.30	Fully Threaded	80,000	ASTM F879M	25	000000000	0000	00000000	0000	0000000	0000




								M4 × 0.7 mm

								6	90°	Standard	8.90	2.50	Fully Threaded	80,000	ASTM F879M	25	000000000	0000	00000000	0000	0000000	0000


								8	90°	Standard	8.90	2.50	Fully Threaded	80,000	ASTM F879M	25	000000000	0000	00000000	0000	0000000	0000
								10	90°	Standard	8.90	2.50	Fully Threaded	80,000	ASTM F879M	25	000000000	0000	00000000	0000	0000000	0000
								12	90°	Standard	8.90	2.50	Fully Threaded	80,000	ASTM F879M	25	000000000	0000	00000000	0000	0000000	0000
								16	90°	Standard	8.90	2.50	Fully Threaded	80,000	ASTM F879M	25	000000000	0000	00000000	0000	0000000	0000
								20	90°	Standard	8.90	2.50	Fully Threaded	80,000	ASTM F879M	25	000000000	0000	00000000	0000	0000000	0000
								25	90°	Standard	8.90	2.50	Fully Threaded	80,000	ASTM F879M	25	000000000	00000	00000000	0000	0000000	0000
								30	90°	Standard	8.90	2.50	Fully Threaded	80,000	ASTM F879M	25	000000000	00000	00000000	0000	0000000	0000




										M5 × 0.8 mm

										8	90°	Standard	11.20	3.10	Fully Threaded	80,000	ASTM F879M	25	000000000	0000	00000000	0000	0000000	0000


										10	90°	Standard	11.20	3.10	Fully Threaded	80,000	ASTM F879M	25	000000000	0000	00000000	0000	0000000	0000
										12	90°	Standard	11.20	3.10	Fully Threaded	80,000	ASTM F879M	25	000000000	0000	00000000	0000	0000000	0000
										16	90°	Standard	11.20	3.10	Fully Threaded	80,000	ASTM F879M	25	000000000	0000	00000000	0000	0000000	0000
										20	90°	Standard	11.20	3.10	Fully Threaded	80,000	ASTM F879M	25	000000000	00000	00000000	0000	0000000	0000
										25	90°	Standard	11.20	3.10	Fully Threaded	80,000	ASTM F879M	25	000000000	00000	00000000	0000	0000000	0000
										30	90°	Standard	11.20	3.10	Fully Threaded	80,000	ASTM F879M	25	000000000	00000	00000000	0000	0000000	0000
										40	90°	Standard	11.20	3.10	Fully Threaded	80,000	ASTM F879M	10	000000000	0000	00000000	0000	0000000	0000
50										90°	Standard	11.20	3.10	Fully Threaded	80,000	ASTM F879M	10	000000000	0000	00000000	0000	0000000	0000
60	90°									Standard	11.20	3.10	Fully Threaded	80,000	ASTM F879M	10	000000000	0000	00000000	0000	0000000	0000




		M6 × 1 mm

		10	90°							Standard	13.40	3.70	Fully Threaded	80,000	ASTM F879M	10	000000000	0000	00000000	0000	0000000	0000


		12	90°							Standard	13.40	3.70	Fully Threaded	80,000	ASTM F879M	10	000000000	0000	00000000	0000	0000000	0000
		16	90°							Standard	13.40	3.70	Fully Threaded	80,000	ASTM F879M	10	000000000	0000	00000000	0000	0000000	0000
		20	90°							Standard	13.40	3.70	Fully Threaded	80,000	ASTM F879M	10	000000000	0000	00000000	0000	0000000	0000
		25	90°							Standard	13.40	3.70	Fully Threaded	80,000	ASTM F879M	10	000000000	0000	00000000	0000	0000000	0000
		30	90°							Standard	13.40	3.70	Fully Threaded	80,000	ASTM F879M	10	000000000	0000	00000000	0000	0000000	0000
		40	90°							Standard	13.40	3.70	Fully Threaded	80,000	ASTM F879M	10	000000000	0000	00000000	0000	0000000	0000
		50	90°							Standard	13.40	3.70	Fully Threaded	80,000	ASTM F879M	10	000000000	0000	00000000	0000	0000000	0000
		60	90°							Standard	13.40	3.70	Fully Threaded	80,000	ASTM F879M	10	000000000	00000	00000000	0000	0000000	0000




				M8 × 1.25 mm

				16	90°					Standard	17.90	5.00	Fully Threaded	80,000	ASTM F879M	10	000000000	0000	00000000	0000	0000000	0000


				20	90°					Standard	17.90	5.00	Fully Threaded	80,000	ASTM F879M	10	000000000	00000	00000000	0000	0000000	0000
				25	90°					Standard	17.90	5.00	Fully Threaded	80,000	ASTM F879M	10	000000000	00000	00000000	0000	0000000	0000
				30	90°					Standard	17.90	5.00	Fully Threaded	80,000	ASTM F879M	10	000000000	00000	00000000	0000	0000000	0000

Tamper-Resistant Hex-Drive Stainless Steel Button Head Screws

Our most corrosion-resistant hex-drive screws for preventing unauthorized access. Also known as pin-in-hex and pin-in-socket drives, these screws have a security pin in the drive that you can only turn with a tamper-resistant hex driver. The deep six-point opening helps them withstand torque without damaging the drive. 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, mm
	Lg., mm	Dia.	Ht.	Threading	Tensile Strength, psi	Specs. Met	Pkg. Qty.		Pkg.		Each		Each
18-8 Stainless Steel







				M3 × 0.5 mm

				6	6.2	1.65	Fully Threaded	80,000	ASTM F879M	50	000000000	000000	0000000	00000	0000000	00000


				8	6.2	1.65	Fully Threaded	80,000	ASTM F879M	50	000000000	00000	0000000	0000	0000000	0000
				10	5.69	1.65	Fully Threaded	80,000	ASTM F879M	50	000000000	00000	0000000	0000	0000000	0000
				12	5.69	1.65	Fully Threaded	80,000	ASTM F879M	50	000000000	00000	0000000	0000	0000000	0000




						M4 × 0.7 mm

						6	7.59	2.18	Fully Threaded	80,000	ASTM F879M	50	000000000	00000	0000000	0000	0000000	0000


						8	7.59	2.18	Fully Threaded	80,000	ASTM F879M	25	000000000	0000	0000000	0000	0000000	0000
						10	7.59	2.18	Fully Threaded	80,000	ASTM F879M	25	000000000	0000	0000000	0000	0000000	0000
						12	7.59	2.18	Fully Threaded	80,000	ASTM F879M	25	000000000	0000	0000000	0000	0000000	0000
						16	7.59	2.18	Fully Threaded	80,000	ASTM F879M	25	000000000	0000	0000000	0000	0000000	0000
						20	7.59	2.18	Fully Threaded	80,000	ASTM F879M	25	000000000	00000	0000000	0000	0000000	0000




								M5 × 0.8 mm

								8	9.5	2.74	Fully Threaded	80,000	ASTM F879M	25	000000000	00000	0000000	0000	0000000	0000


								10	9.5	2.74	Fully Threaded	80,000	ASTM F879M	25	000000000	00000	0000000	0000	0000000	0000
								12	9.5	2.74	Fully Threaded	80,000	ASTM F879M	25	000000000	00000	0000000	0000	0000000	0000
								16	9.5	2.74	Fully Threaded	80,000	ASTM F879M	25	000000000	00000	0000000	0000	0000000	0000
								20	9.5	2.74	Fully Threaded	80,000	ASTM F879M	25	000000000	00000	0000000	0000	0000000	0000




										M6 × 1 mm

										10	10.49	3.28	Fully Threaded	80,000	ASTM F879M	25	000000000	00000	0000000	0000	0000000	0000


										12	10.49	3.28	Fully Threaded	80,000	ASTM F879M	25	000000000	00000	0000000	0000	0000000	0000
										16	10.49	3.28	Fully Threaded	80,000	ASTM F879M	10	000000000	0000	0000000	0000	0000000	0000
										20	10.49	3.28	Fully Threaded	80,000	ASTM F879M	10	000000000	0000	0000000	0000	0000000	0000
										25	10.49	3.28	Fully Threaded	80,000	ASTM F879M	10	000000000	0000	0000000	0000	0000000	0000
										30	10.49	3.28	Fully Threaded	80,000	ASTM F879M	10	000000000	0000	0000000	0000	0000000	0000




												M8 × 1.25 mm

												12	14	4.39	Fully Threaded	80,000	ASTM F879M	10	000000000	00000	0000000	0000	0000000	0000


16	14											4.39	Fully Threaded	80,000	ASTM F879M	10	000000000	00000	0000000	0000	0000000	0000
20	14											4.39	Fully Threaded	80,000	ASTM F879M	10	000000000	00000	0000000	0000	0000000	0000
25	14											4.39	Fully Threaded	80,000	ASTM F879M	10	000000000	00000	0000000	0000	0000000	0000
30	14											4.39	Fully Threaded	80,000	ASTM F879M	10	000000000	00000	0000000	0000	0000000	0000




		M10 × 1.5 mm

		20	17.5									5.49	Fully Threaded	80,000	ASTM F879M	5	000000000	0000	0000000	0000	0000000	0000


		25	17.5									5.49	Fully Threaded	80,000	ASTM F879M	5	000000000	00000	0000000	0000	0000000	0000
		30	17.5									5.49	Fully Threaded	80,000	ASTM F879M	5	000000000	00000	0000000	0000	0000000	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.

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	Pkg. Qty.		Pkg.		Each		Each
18-8 Stainless Steel







				M3 × 0.5 mm

				6	90°	Standard	6.71	1.85	Fully Threaded	80,000	ASTM F879M	50	000000000	000000	0000000	00000	0000000	00000


				8	90°	Standard	6.71	1.85	Fully Threaded	80,000	ASTM F879M	50	000000000	00000	0000000	0000	0000000	0000
				10	90°	Standard	6.71	1.85	Fully Threaded	80,000	ASTM F879M	50	000000000	00000	0000000	0000	0000000	0000
				12	90°	Standard	6.71	1.85	Fully Threaded	80,000	ASTM F879M	50	000000000	00000	0000000	0000	0000000	0000




						M4 × 0.7 mm

						6	90°	Standard	8.94	2.48	Fully Threaded	80,000	ASTM F879M	25	000000000	0000	0000000	0000	0000000	0000


						8	90°	Standard	8.94	2.48	Fully Threaded	80,000	ASTM F879M	25	000000000	0000	0000000	0000	0000000	0000
						10	90°	Standard	8.94	2.48	Fully Threaded	80,000	ASTM F879M	25	000000000	0000	0000000	0000	0000000	0000
						12	90°	Standard	8.94	2.48	Fully Threaded	80,000	ASTM F879M	25	000000000	0000	0000000	0000	0000000	0000
						16	90°	Standard	8.94	2.48	Fully Threaded	80,000	ASTM F879M	25	000000000	0000	0000000	0000	0000000	0000




								M5 × 0.8 mm

								8	90°	Standard	11.2	3.10	Fully Threaded	80,000	ASTM F879M	25	000000000	0000	0000000	0000	0000000	0000


								10	90°	Standard	11.2	3.10	Fully Threaded	80,000	ASTM F879M	25	000000000	00000	0000000	0000	0000000	0000
								12	90°	Standard	11.2	3.10	Fully Threaded	80,000	ASTM F879M	25	000000000	00000	0000000	0000	0000000	0000
								16	90°	Standard	11.2	3.10	Fully Threaded	80,000	ASTM F879M	25	000000000	00000	0000000	0000	0000000	0000
								20	90°	Standard	11.2	3.10	Fully Threaded	80,000	ASTM F879M	25	000000000	00000	0000000	0000	0000000	0000




										M6 × 1 mm

										12	90°	Standard	13.44	3.72	Fully Threaded	80,000	ASTM F879M	10	000000000	0000	0000000	0000	0000000	0000


										16	90°	Standard	13.44	3.72	Fully Threaded	80,000	ASTM F879M	10	000000000	0000	0000000	0000	0000000	0000
										20	90°	Standard	13.44	3.72	Fully Threaded	80,000	ASTM F879M	10	000000000	0000	0000000	0000	0000000	0000
										25	90°	Standard	13.44	3.72	Fully Threaded	80,000	ASTM F879M	10	000000000	0000	0000000	0000	0000000	0000
										30	90°	Standard	13.44	3.72	Fully Threaded	80,000	ASTM F879M	10	000000000	0000	0000000	0000	0000000	0000




												M8 × 1.25 mm

												16	90°	Standard	17.91	4.95	Fully Threaded	80,000	ASTM F879M	10	000000000	00000	0000000	0000	0000000	0000


												20	90°	Standard	17.91	4.95	Fully Threaded	80,000	ASTM F879M	10	000000000	00000	0000000	0000	0000000	0000
25												90°	Standard	17.91	4.95	Fully Threaded	80,000	ASTM F879M	10	000000000	00000	0000000	0000	0000000	0000
30	90°											Standard	17.91	4.95	Fully Threaded	80,000	ASTM F879M	10	000000000	00000	0000000	0000	0000000	0000

Sealing Tamper-Resistant Torx Stainless Steel Button Head Screws

Restrict unauthorized access while keeping out contaminants and locking in air and fluid. Also known as pin-in Torx, these screws have a security pin in the drive that only turns with a tamper-resistant Torx driver. They also have a rubber O-ring under the head that compresses to form a tight seal as you tighten them. Made of stainless steel, they won't rust or corrode when exposed to moisture and chemicals. The button head looks similar to a pan head, but it's lower and more compact, taking up less space.

These screws are reusable as long as the rubber O-ring is intact and undamaged. 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.

Buna-N O-Ring—These seals won't swell or soften when they touch oil, grease, or fuel.

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	Dia.	Ht.	Threading	Tensile Strength, psi	For Max. Hole Dia., mm	Max. Pressure, psi	O-Ring Temp. Range, ° F	Specs. Met	Pkg. Qty.		Pkg.		Each		Each
18-8 Stainless Steel with Buna-N O-Ring







				M3 × 0.5 mm

				6	5.69	1.65	Fully Threaded	100,000	3.454	1,500	-40 to 225	ASTM F879M, ISO 7380	5	000000000	000000	00000000	00000	0000000	00000


				8	5.69	1.65	Fully Threaded	100,000	3.454	1,500	-40 to 225	ASTM F879M, ISO 7380	5	000000000	00000	00000000	0000	0000000	0000
				10	5.69	1.65	Fully Threaded	100,000	3.454	1,500	-40 to 225	ASTM F879M, ISO 7380	5	000000000	00000	00000000	0000	0000000	0000
				12	5.69	1.65	Fully Threaded	100,000	3.454	1,500	-40 to 225	ASTM F879M, ISO 7380	5	000000000	00000	00000000	0000	0000000	0000
				16	5.69	1.65	Fully Threaded	100,000	3.454	1,500	-40 to 225	ASTM F879M, ISO 7380	5	000000000	00000	00000000	0000	0000000	0000




						M4 × 0.7 mm

						10	7.6	2.18	Fully Threaded	100,000	4.546	1,500	-40 to 225	ASTM F879M, ISO 7380	5	000000000	00000	00000000	0000	0000000	0000


						12	7.6	2.18	Fully Threaded	100,000	4.546	1,500	-40 to 225	ASTM F879M, ISO 7380	5	000000000	00000	00000000	0000	0000000	0000
						20	7.6	2.18	Fully Threaded	100,000	4.546	1,500	-40 to 225	ASTM F879M, ISO 7380	5	000000000	00000	00000000	0000	0000000	0000
						25	7.6	2.18	Fully Threaded	100,000	4.546	1,500	-40 to 225	ASTM F879M, ISO 7380	5	000000000	00000	00000000	0000	0000000	0000




								M5 × 0.8 mm

								8	9.5	2.74	Fully Threaded	100,000	5.562	1,500	-40 to 225	ASTM F879M, ISO 7380	5	000000000	00000	00000000	0000	0000000	0000


								16	9.5	2.74	Fully Threaded	100,000	5.562	1,500	-40 to 225	ASTM F879M, ISO 7380	5	000000000	00000	00000000	0000	0000000	0000
								20	9.5	2.74	Fully Threaded	100,000	5.562	1,500	-40 to 225	ASTM F879M, ISO 7380	5	000000000	00000	00000000	0000	0000000	0000
								25	9.5	2.74	Fully Threaded	100,000	5.562	1,500	-40 to 225	ASTM F879M, ISO 7380	5	000000000	00000	00000000	0000	0000000	0000




										M6 × 1 mm

										12	10.5	3.28	Fully Threaded	100,000	6.655	1,500	-40 to 225	ASTM F879M, ISO 7380	5	000000000	00000	00000000	0000	0000000	0000


										16	10.5	3.28	Fully Threaded	100,000	6.655	1,500	-40 to 225	ASTM F879M, ISO 7380	5	000000000	00000	00000000	0000	0000000	0000
										20	10.5	3.28	Fully Threaded	100,000	6.655	1,500	-40 to 225	ASTM F879M, ISO 7380	5	000000000	00000	00000000	0000	0000000	0000
										25	10.5	3.28	Fully Threaded	100,000	6.655	1,500	-40 to 225	ASTM F879M, ISO 7380	5	000000000	00000	00000000	0000	0000000	0000