8" Wood Screws | McMaster-Carr

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25 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.

Black-Oxide Steel—Typically chosen for their appearance, these screws have a dark, matte coating to create a finished look. They offer minimal corrosion resistance, so they're best for dry environments.

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

Hot-Dipped Galvanized Steel—Combines the strength of steel with the corrosion resistance of stainless steel. These screws are an economical alternative to 18-8 stainless steel in wet and outdoor environments. You can use them with chemically treated wood, such as ACQ-treated (arsenic-free) lumber, but they won't hold up to salt water.

	Head Ht.	Approx. Threads per In.	Threading	Tapping Method	Specs. Met	Pkg. Qty.		Pkg.
Black-Oxide Steel







			1/2"

			8"	0.344"	6	Partially Threaded	Thread Forming	ASME B18.2.1	1	95452A149	000000




					3/4"

					8"	0.5"	4 1/2	Partially Threaded	Thread Forming	ASME B18.2.1	1	95452A170	00000


					Zinc-Plated Steel







									3/8"

									8"	0.25"	7	Partially Threaded	Thread Forming	ASME B18.2.1	5	91478A652	0000




											1/2"

											8"	0.344"	6	Partially Threaded	Thread Forming	ASME B18.2.1	5	91478A740	00000


											Hot-Dipped Galvanized Steel







															3/8"

															8"	0.25"	7	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	10	94048A320	00000




																	1/2"

																	8"	0.344"	6	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	5	94048A359	00000




																			5/8"

																			8"	0.422"	5	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	1	94048A396	0000




																			3/4"

	8"	0.5"																	4 1/2	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	1	94048A430	00000

Stainless Steel Flanged Hex Head Wood Screws

A built-in flange protects surfaces from splitting and pull-through by spreading pressure over a large area. These screws won't rust, so you can use their coarse threads to secure posts and beams outdoors. They also won't degrade from chemically treated wood, such as ACQ-treated (arsenic-free) lumber. 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. Head height includes the flange. Length is measured from under the flange.

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

	Approx. Threads per In.	Threading	Tapping Method	Pkg. Qty.		Pkg.
316 Stainless Steel







	1/4"

	8"	0.21"	0.45"	13	Partially Threaded	Thread Forming	1	91428A700	00000




			3/8"

			8"	0.275"	0.66"	7	Partially Threaded	Thread Forming	1	91428A141	00000

Stainless Steel Hex Head Wood Screws

With coarse threads that dig in, these screws secure posts and beams in outdoor and wet environments. They won't degrade from moisture or chemically treated wood, such as ACQ-treated (arsenic-free) lumber. The hex head's six contact points keep sockets in place to avoid slipping and stripping on 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.

18-8 Stainless Steel—The choice for wet and outdoor environments, these screws resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

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

	Head Ht.	Approx. Threads per In.	Threading	Tapping Method	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel







			1/4"

			8"	0.172"	10	Partially Threaded	Thread Forming	ASME B18.2.1	1	92351A116	000000




					5/16"

					8"	0.219"	9	Partially Threaded	Thread Forming	ASME B18.2.1	1	92351A118	00000




							3/8"

							8"	0.25"	7	Partially Threaded	Thread Forming	ASME B18.2.1	1	92351A662	00000




									1/2"

									8"	0.344"	6	Partially Threaded	Thread Forming	ASME B18.2.1	1	92351A746	00000




											5/8"

											8"	0.422"	5	Partially Threaded	Thread Forming	ASME B18.2.1	1	92351A843	00000




													3/4"

													8"	0.5"	4 1/2	Partially Threaded	Thread Forming	ASME B18.2.1	1	92351A935	00000


													316 Stainless Steel







																	3/8"

																	8"	0.25"	7	Partially Threaded	Thread Forming	ASME B18.2.1	1	90123A417	00000




																			1/2"

8"																			0.344"	6	Partially Threaded	Thread Forming	ASME B18.2.1	1	90123A481	00000




	5/8"

	8"	0.422"																	5	Partially Threaded	Thread Forming	ASME B18.2.1	1	90123A553	00000




																			3/4"

			8"	0.5"															4 1/2	Partially Threaded	Thread Forming	ASME B18.2.1	1	90123A665	00000

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.

18-8 Stainless Steel—The choice for wet and outdoor environments, these studs resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

	(A)		(B)
	Screw Size	Thread Lg.	Thread Size	Thread Lg.	Lg.	Tensile Strength	Hardness	Pkg. Qty.		Pkg.
18-8 Stainless Steel



		1/4"	3"	1/4"-20	2 1/2"	8"	Not Rated	Not Rated	5	90915A655	000000


		3/8"	3"	3/8"-16	2 1/2"	8"	Not Rated	Not Rated	1	90915A660	0000
		1/2"	3"	1/2"-13	2 1/2"	8"	Not Rated	Not Rated	1	90915A662	00000

Hot Glue Sticks

When heated, these glue sticks melt and quickly begin to harden. Use them to seal packaging and form other low- to medium-strength bonds. 3M glue sticks work only with 3M glue guns.

Adhesives that take longer to harden are suited for applications that require some repositioning, because the longer open times allow for more adjustment. For high-volume applications, adhesives with a lower viscosity flow faster than other hot-melt adhesives.

3M Scotch-Weld

Image of Product. Front orientation. Hot Glue. Hot Glue Sticks.

Model Number 3762LM—3762LM are low-temperature formulations, which work well on delicate or heat-sensitive materials. 3762LM are high-tack adhesives; they bond quickly with light pressure.

Model Number 3792LM—3792LM are low-temperature formulations, which work well on delicate or heat-sensitive materials.

Mfr. Model No.	For 3M Gun Model No.	Dia.	Lg.	Begins to Harden, sec.	Reaches Full Strength, hr.	Application Temp. Range, ° F	Consistency	Viscosity, cP	Elongation	Color	For Joining	Approx. No. of Sticks per lb.		1 lb.	11 lb.
3762LM	EC, TC/TC-Q LT	5/8"	8"	25	24	250 to 270	Thick Liquid	4,000	400%	Light Amber	Cardboard, Plastic, Rubber, Wood	15	7464A74	000000	0000000
3792LM	EC, TC/TC-Q LT	5/8"	8"	40	24	250 to 270	Thick Liquid	10,500	400%	Clear	Fabric, Plastic, Rubber, Wood	15	7464A79	00000	000000