Metric Lag Screws | McMaster-Carr

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81 Products

Steel Hex Head Wood Screws

Often used on posts and beams, the coarse threads on these screws dig in for a firm hold. The hex head's six contact points keep sockets in place to avoid slipping and stripping the drive. To tighten, use a wrench or six-point hex socket. Also known as lag bolts.

Drill a pilot hole slightly smaller than the screw to prevent splitting. Length is measured from under the head.

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

	Lg., mm	Head Ht., mm	Threading	Tapping Method	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel







				M5 × 2.2 mm

				20	3.5	Partially Threaded	Thread Forming	DIN 571	100	000000000	00000


				25	3.5	Partially Threaded	Thread Forming	DIN 571	100	000000000	00000
				30	3.5	Partially Threaded	Thread Forming	DIN 571	100	000000000	00000
				35	3.5	Partially Threaded	Thread Forming	DIN 571	50	000000000	0000
				40	3.5	Partially Threaded	Thread Forming	DIN 571	50	000000000	00000
				45	3.5	Partially Threaded	Thread Forming	DIN 571	50	000000000	0000
				50	3.5	Partially Threaded	Thread Forming	DIN 571	50	000000000	00000
				60	3.5	Partially Threaded	Thread Forming	DIN 571	50	000000000	00000




						M6 × 2.6 mm

						20	4	Partially Threaded	Thread Forming	DIN 571	50	000000000	0000


						25	4	Partially Threaded	Thread Forming	DIN 571	50	000000000	0000
						30	4	Partially Threaded	Thread Forming	DIN 571	50	000000000	00000
						35	4	Partially Threaded	Thread Forming	DIN 571	50	000000000	00000
						40	4	Partially Threaded	Thread Forming	DIN 571	50	000000000	00000
						45	4	Partially Threaded	Thread Forming	DIN 571	50	000000000	00000
						50	4	Partially Threaded	Thread Forming	DIN 571	25	000000000	00000
						55	4	Partially Threaded	Thread Forming	DIN 571	25	000000000	0000
						60	4	Partially Threaded	Thread Forming	DIN 571	25	000000000	0000
						70	4	Partially Threaded	Thread Forming	DIN 571	25	000000000	00000
						80	4	Partially Threaded	Thread Forming	DIN 571	25	000000000	00000


						90	4	Partially Threaded	Thread Forming	DIN 571	25	000000000	00000
						100	4	Partially Threaded	Thread Forming	DIN 571	25	000000000	00000
						120	4	Partially Threaded	Thread Forming	DIN 571	10	000000000	0000




								M8 × 3.6 mm

								25	5.5	Partially Threaded	Thread Forming	DIN 571	25	000000000	0000


								30	5.5	Partially Threaded	Thread Forming	DIN 571	25	000000000	0000
								35	5.5	Partially Threaded	Thread Forming	DIN 571	25	000000000	0000
								40	5.5	Partially Threaded	Thread Forming	DIN 571	25	000000000	00000
								45	5.5	Partially Threaded	Thread Forming	DIN 571	25	000000000	00000
								50	5.5	Partially Threaded	Thread Forming	DIN 571	25	000000000	00000
								55	5.5	Partially Threaded	Thread Forming	DIN 571	25	000000000	00000
								60	5.5	Partially Threaded	Thread Forming	DIN 571	10	000000000	0000
								70	5.5	Partially Threaded	Thread Forming	DIN 571	10	000000000	0000
								80	5.5	Partially Threaded	Thread Forming	DIN 571	10	000000000	0000
								90	5.5	Partially Threaded	Thread Forming	DIN 571	10	000000000	0000


100								5.5	Partially Threaded	Thread Forming	DIN 571	10	000000000	0000
120	5.5							Partially Threaded	Thread Forming	DIN 571	10	000000000	00000
130	5.5							Partially Threaded	Thread Forming	DIN 571	10	000000000	00000
140	5.5							Partially Threaded	Thread Forming	DIN 571	10	000000000	00000
160	5.5							Partially Threaded	Thread Forming	DIN 571	5	000000000	0000




		M10 × 4.5 mm

		30	7					Partially Threaded	Thread Forming	DIN 571	10	000000000	0000


		35	7					Partially Threaded	Thread Forming	DIN 571	10	000000000	0000
		40	7					Partially Threaded	Thread Forming	DIN 571	10	000000000	0000
		45	7					Partially Threaded	Thread Forming	DIN 571	10	000000000	0000
		50	7					Partially Threaded	Thread Forming	DIN 571	10	000000000	0000
		55	7					Partially Threaded	Thread Forming	DIN 571	10	000000000	0000
		60	7					Partially Threaded	Thread Forming	DIN 571	10	000000000	0000
		70	7					Partially Threaded	Thread Forming	DIN 571	10	000000000	00000
		80	7					Partially Threaded	Thread Forming	DIN 571	10	000000000	00000
		90	7	Partially Threaded				Thread Forming	DIN 571	10	000000000	00000
		100	7	Partially Threaded	Thread Forming			DIN 571	10	000000000	00000


		120	7	Partially Threaded	Thread Forming			DIN 571	5	000000000	0000
		140	7	Partially Threaded	Thread Forming			DIN 571	5	000000000	0000
		160	7	Partially Threaded	Thread Forming			DIN 571	5	000000000	0000
		180	7	Partially Threaded	Thread Forming			DIN 571	5	000000000	0000
		200	7	Partially Threaded	Thread Forming			DIN 571	1	000000000	0000




				M12 × 5 mm

				40	8			Partially Threaded	Thread Forming	DIN 571	10	000000000	00000


				45	8			Partially Threaded	Thread Forming	DIN 571	10	000000000	0000
				50	8			Partially Threaded	Thread Forming	DIN 571	10	000000000	00000
				60	8			Partially Threaded	Thread Forming	DIN 571	5	000000000	0000
				70	8			Partially Threaded	Thread Forming	DIN 571	5	000000000	0000
				80	8			Partially Threaded	Thread Forming	DIN 571	5	000000000	0000
				90	8			Partially Threaded	Thread Forming	DIN 571	5	000000000	0000
				100	8			Partially Threaded	Thread Forming	DIN 571	5	000000000	00000
				120	8	Partially Threaded		Thread Forming	DIN 571	5	000000000	00000
				140	8	Partially Threaded	Thread Forming	DIN 571	5	000000000	00000
				160	8	Partially Threaded	Thread Forming	DIN 571	1	000000000	0000


				180	8	Partially Threaded	Thread Forming	DIN 571	1	000000000	0000
				200	8	Partially Threaded	Thread Forming	DIN 571	1	000000000	0000
				220	8	Partially Threaded	Thread Forming	DIN 571	1	000000000	0000
				240	8	Partially Threaded	Thread Forming	DIN 571	1	000000000	0000




						M16 × 6 mm

						60	10	Partially Threaded	Thread Forming	DIN 571	1	000000000	0000


						70	10	Partially Threaded	Thread Forming	DIN 571	1	000000000	0000
						80	10	Partially Threaded	Thread Forming	DIN 571	1	000000000	0000
						90	10	Partially Threaded	Thread Forming	DIN 571	1	000000000	0000
						100	10	Partially Threaded	Thread Forming	DIN 571	1	000000000	0000
						120	10	Partially Threaded	Thread Forming	DIN 571	1	000000000	0000

Thread-Mount Studs for Wood

Also known as hanger bolts, use these studs to hang, mount, and fasten parts to wood structures. Install them with a stud driver, or create wrench flats by threading two nuts onto the stud and jamming them together.

316 Stainless Steel—Superior to 18-8 stainless steel, these studs won't degrade when exposed to harsh weather, salt water, and most chemicals.

	(A)		(B)
	Screw Size	Thread Lg., mm	Thread Size	Thread Lg., mm	Lg., mm	Tensile Strength, psi	Hardness	Pkg. Qty.		Pkg.
316 Stainless Steel



		M5	27	M5 × 0.8 mm	20	50	Not Rated	Not Rated	1	000000000	00000


		M6	37	M6 × 1 mm	30	70	Not Rated	Not Rated	1	000000000	0000
		M8	57	M8 × 1.25 mm	40	100	Not Rated	Not Rated	1	000000000	0000
		M10	40	M10 × 1.5 mm	20	60	100,000	Rockwell C25	1	000000000	0000
		M10	60	M10 × 1.5 mm	20	80	100,000	Rockwell C25	1	000000000	0000
		M10	70	M10 × 1.5 mm	30	100	100,000	Rockwell C25	1	000000000	0000