ISO 8676 Screws | McMaster-Carr

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98 Products

About Hex Head Screws and Bolts

Choose a hex head fastener with the right threading, thread size, material, and strength for your equipment.

Steel Hex Head Screws

Fully Threaded

Our most popular hex head screws. These have a head with six flat sides to keep wrenches and sockets from slipping and rounding off the drive.

Length is measured from under the head.

Medium-Strength Fastener—Your go-to screws for fastening most machinery and equipment. They have tensile strengths from 90,000 to 120,000 psi.

High-Strength Fastener—Commonly used to fasten components in valves, pumps, motors, and other high-stress applications. These screws have a tensile strength of 125,000 to 160,000 psi.

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

Zinc-Yellow-Chromate-Plated Steel—With slightly better corrosion resistance than zinc-plated steel screws, these stand up to more frequent exposure to moisture.

		Head, mm
	Lg., mm	Wd.	Ht.	Threading	Thread Spacing	Fastener Strength Grade/Class	Tensile Strength, psi	Pkg. Qty.		Pkg.
Medium-Strength Zinc-Plated Steel







				M8 × 1 mm

				10	13	5.3	Fully Threaded	Fine	Class 8.8	110,000	25	91180A525	000000


				12	13	5.3	Fully Threaded	Fine	Class 8.8	110,000	25	91180A901	0000
				16	13	5.3	Fully Threaded	Fine	Class 8.8	110,000	25	91180A527	00000
				20	13	5.3	Fully Threaded	Fine	Class 8.8	110,000	50	91180A530	00000
				25	13	5.3	Fully Threaded	Fine	Class 8.8	110,000	50	91180A534	00000
				30	13	5.3	Fully Threaded	Fine	Class 8.8	110,000	50	91180A538	00000
				35	13	5.3	Fully Threaded	Fine	Class 8.8	110,000	25	91180A539	00000
				40	13	5.3	Fully Threaded	Fine	Class 8.8	110,000	25	91180A540	00000
				45	13	5.3	Fully Threaded	Fine	Class 8.8	110,000	10	91180A351	0000
				50	13	5.3	Fully Threaded	Fine	Class 8.8	110,000	10	91180A352	0000




						M10 × 1.25 mm

						16	17	6.4	Fully Threaded	Fine	Class 8.8	110,000	25	91180A624	00000


						20	17	6.4	Fully Threaded	Fine	Class 8.8	110,000	25	91180A626	00000
						25	17	6.4	Fully Threaded	Fine	Class 8.8	110,000	25	91180A630	00000
						30	17	6.4	Fully Threaded	Fine	Class 8.8	110,000	25	91180A634	00000
						35	17	6.4	Fully Threaded	Fine	Class 8.8	110,000	10	91180A636	0000
						40	17	6.4	Fully Threaded	Fine	Class 8.8	110,000	10	91180A639	00000
						45	17	6.4	Fully Threaded	Fine	Class 8.8	110,000	10	91180A375	00000
						50	17	6.4	Fully Threaded	Fine	Class 8.8	110,000	10	91180A376	00000
						60	17	6.4	Fully Threaded	Fine	Class 8.8	110,000	10	91180A904	00000




								M10 × 1 mm

								16	17	6.4	Fully Threaded	Extra Fine	Class 8.8	110,000	10	91180A363	0000


								20	17	6.4	Fully Threaded	Extra Fine	Class 8.8	110,000	10	91180A552	0000
								25	17	6.4	Fully Threaded	Extra Fine	Class 8.8	110,000	10	91180A553	00000
								30	17	6.4	Fully Threaded	Extra Fine	Class 8.8	110,000	10	91180A555	00000
								35	17	6.4	Fully Threaded	Extra Fine	Class 8.8	110,000	10	91180A557	00000
								40	17	6.4	Fully Threaded	Extra Fine	Class 8.8	110,000	10	91180A364	00000
								45	17	6.4	Fully Threaded	Extra Fine	Class 8.8	110,000	10	91180A902	00000
								50	17	6.4	Fully Threaded	Extra Fine	Class 8.8	110,000	10	91180A365	00000
								60	17	6.4	Fully Threaded	Extra Fine	Class 8.8	110,000	10	91180A903	00000




										M12 × 1.5 mm

										16	19	7.5	Fully Threaded	Fine	Class 8.8	110,000	10	91180A906	00000


20										19	7.5	Fully Threaded	Fine	Class 8.8	110,000	10	91180A743	00000
25	19									7.5	Fully Threaded	Fine	Class 8.8	110,000	10	91180A745	00000
30	19									7.5	Fully Threaded	Fine	Class 8.8	110,000	10	91180A747	00000
35	19									7.5	Fully Threaded	Fine	Class 8.8	110,000	10	91180A749	00000
40	19									7.5	Fully Threaded	Fine	Class 8.8	110,000	10	91180A751	00000
45	19	7.5								Fully Threaded	Fine	Class 8.8	110,000	10	91180A907	00000
50	19	7.5	Fully Threaded							Fine	Class 8.8	110,000	5	91180A752	00000
60	19	7.5	Fully Threaded							Fine	Class 8.8	110,000	5	91180A908	00000




		M12 × 1.25 mm

		20	19							7.5	Fully Threaded	Extra Fine	Class 8.8	110,000	10	91180A711	00000


		25	19							7.5	Fully Threaded	Extra Fine	Class 8.8	110,000	10	91180A714	00000
		30	19							7.5	Fully Threaded	Extra Fine	Class 8.8	110,000	10	91180A716	00000
		35	19							7.5	Fully Threaded	Extra Fine	Class 8.8	110,000	10	91180A718	00000
		40	19							7.5	Fully Threaded	Extra Fine	Class 8.8	110,000	10	91180A720	00000
		45	19							7.5	Fully Threaded	Extra Fine	Class 8.8	110,000	10	91180A725	00000
		50	19							7.5	Fully Threaded	Extra Fine	Class 8.8	110,000	5	91180A390	0000
		60	19							7.5	Fully Threaded	Extra Fine	Class 8.8	110,000	10	91180A905	00000




				M14 × 1.5 mm

				20	22					8.8	Fully Threaded	Fine	Class 8.8	110,000	1	91180A774	0000


				25	22					8.8	Fully Threaded	Fine	Class 8.8	110,000	5	91180A776	00000
				30	22					8.8	Fully Threaded	Fine	Class 8.8	110,000	10	91180A778	00000
				35	22					8.8	Fully Threaded	Fine	Class 8.8	110,000	10	91180A780	00000
				40	22					8.8	Fully Threaded	Fine	Class 8.8	110,000	5	91180A782	00000
				45	22					8.8	Fully Threaded	Fine	Class 8.8	110,000	5	91180A909	00000
				50	22					8.8	Fully Threaded	Fine	Class 8.8	110,000	5	91180A786	00000
				55	22					8.8	Fully Threaded	Fine	Class 8.8	110,000	5	91180A787	00000
				60	22					8.8	Fully Threaded	Fine	Class 8.8	110,000	1	91180A381	0000




						M16 × 1.5 mm

						20	24			10	Fully Threaded	Fine	Class 8.8	110,000	5	91180A912	00000


						25	24			10	Fully Threaded	Fine	Class 8.8	110,000	5	91180A913	00000
						30	24			10	Fully Threaded	Fine	Class 8.8	110,000	5	91180A860	00000
						35	24			10	Fully Threaded	Fine	Class 8.8	110,000	1	91180A865	0000
						40	24			10	Fully Threaded	Fine	Class 8.8	110,000	5	91180A870	00000
						45	24			10	Fully Threaded	Fine	Class 8.8	110,000	5	91180A355	00000
						50	24			10	Fully Threaded	Fine	Class 8.8	110,000	5	91180A876	00000
						60	24			10	Fully Threaded	Fine	Class 8.8	110,000	1	91180A914	0000




								M18 × 1.5 mm

								30	27	11.5	Fully Threaded	Fine	Class 8.8	110,000	1	91180A915	0000


								35	27	11.7	Fully Threaded	Fine	Class 8.8	110,000	1	91280A027	0000
								40	27	11.5	Fully Threaded	Fine	Class 8.8	110,000	1	91180A916	0000
								50	27	11.5	Fully Threaded	Fine	Class 8.8	110,000	1	91180A917	0000
								60	27	11.5	Fully Threaded	Fine	Class 8.8	110,000	1	91180A918	0000




M20 × 2 mm

50	30									12.5	Fully Threaded	Fine	Class 8.8	110,000	1	91180A919	0000


60	30									12.5	Fully Threaded	Fine	Class 8.8	110,000	1	91180A921	0000




										M20 × 1.5 mm

										30	30	12.5	Fully Threaded	Extra Fine	Class 8.8	110,000	1	91180A922	0000


										35	30	12.7	Fully Threaded	Extra Fine	Class 8.8	110,000	1	91280A033	0000
										40	30	12.5	Fully Threaded	Extra Fine	Class 8.8	110,000	1	91180A923	0000
		50								30	12.5	Fully Threaded	Extra Fine	Class 8.8	110,000	1	91180A924	0000
		60	30							12.5	Fully Threaded	Extra Fine	Class 8.8	110,000	1	91180A925	0000
		70	30							12.7	Fully Threaded	Extra Fine	Class 8.8	110,000	1	91280A034	0000


		High-Strength Zinc-Yellow-Chromate-Plated Steel







												M8 × 1 mm

												20	13	5.3	Fully Threaded	Fine	Class 10.9	150,000	25	91052A101	00000


				25								13	5.3	Fully Threaded	Fine	Class 10.9	150,000	25	91052A102	00000
				30	13							5.3	Fully Threaded	Fine	Class 10.9	150,000	25	91052A103	00000
				40	13							5.3	Fully Threaded	Fine	Class 10.9	150,000	10	91052A104	00000




												M10 × 1.25 mm

												25	17	6.4	Fully Threaded	Fine	Class 10.9	150,000	10	91052A105	00000


												30	17	6.4	Fully Threaded	Fine	Class 10.9	150,000	10	91052A106	00000
												35	17	6.4	Fully Threaded	Fine	Class 10.9	150,000	10	91052A107	00000
												40	17	6.4	Fully Threaded	Fine	Class 10.9	150,000	10	91052A108	00000
												50	17	6.4	Fully Threaded	Fine	Class 10.9	150,000	10	91052A109	00000
						60						17	6.4	Fully Threaded	Fine	Class 10.9	150,000	5	91052A111	00000




												M12 × 1.5 mm

												30	19	7.5	Fully Threaded	Fine	Class 10.9	150,000	10	91052A112	00000


												35	19	7.5	Fully Threaded	Fine	Class 10.9	150,000	10	91052A113	00000
												40	19	7.5	Fully Threaded	Fine	Class 10.9	150,000	5	91052A114	00000
												50	19	7.5	Fully Threaded	Fine	Class 10.9	150,000	5	91052A115	00000




												M12 × 1.25 mm

												30	19	7.5	Fully Threaded	Extra Fine	Class 10.9	150,000	10	91052A116	00000


35	19											7.5	Fully Threaded	Extra Fine	Class 10.9	150,000	10	91052A117	00000
40	19											7.5	Fully Threaded	Extra Fine	Class 10.9	150,000	5	91052A118	00000
50	19											7.5	Fully Threaded	Extra Fine	Class 10.9	150,000	5	91052A119	00000




												M16 × 1.5 mm

												40	24	10	Fully Threaded	Fine	Class 10.9	150,000	5	91052A121	00000


												50	24	10	Fully Threaded	Fine	Class 10.9	150,000	5	91052A122	00000
												60	24	10	Fully Threaded	Fine	Class 10.9	150,000	1	91052A123	0000
		70										24	10	Fully Threaded	Fine	Class 10.9	150,000	1	91052A124	0000
		80	24									10	Fully Threaded	Fine	Class 10.9	150,000	1	91052A125	0000