4 1/2" 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







			1/4"

			4 1/2"	0.172"	10	Partially Threaded	Thread Forming	ASME B18.2.1	5	000000000	000000




					5/16"

					4 1/2"	0.219"	9	Partially Threaded	Thread Forming	ASME B18.2.1	1	000000000	0000




							3/8"

							4 1/2"	0.25"	7	Partially Threaded	Thread Forming	ASME B18.2.1	1	000000000	0000




									1/2"

									4 1/2"	0.344"	6	Partially Threaded	Thread Forming	ASME B18.2.1	1	000000000	0000




											5/8"

											4 1/2"	0.422"	5	Partially Threaded	Thread Forming	ASME B18.2.1	1	000000000	0000


											Zinc-Plated Steel







															3/8"

															4 1/2"	0.25"	7	Partially Threaded	Thread Forming	ASME B18.2.1	25	000000000	00000




																	1/2"

																	4 1/2"	0.344"	6	Partially Threaded	Thread Forming	ASME B18.2.1	10	000000000	00000


																	Hot-Dipped Galvanized Steel







																			1/4"

	4 1/2"	0.172"																	10	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	25	000000000	00000




																			5/16"

			4 1/2"	0.219"															9	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	25	000000000	00000




																			3/8"

					4 1/2"	0.25"													7	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	10	000000000	00000




																			1/2"

							4 1/2"	0.344"											6	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	10	000000000	00000




																			5/8"

									4 1/2"	0.422"									5	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	5	000000000	00000

Stainless Steel Square-Drive Flat Head Screws for Wood and Composite Wood

Fasten decking and fencing outdoors with screws that won't rust. They're often used with chemically treated wood, such as ACQ-treated (arsenic-free) lumber. Also known as deck screws, their trumpet shape spreads pressure to prevent splitting, while the flat head limits snags. The square drive handles more torque than slotted and Phillips drives.

The screw drill tip acts as a built-in pilot, though pilot holes are still recommended near edges to avoid splitting. Length is measured from the top of 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
	Lg.	Dia.	Ht.	Drill Bit Size	Flat Head Profile	Approx. Threads per In.	Threading	Tapping Method	Tapping Screw Type	Pkg. Qty.		Pkg.
18-8 Stainless Steel







				No. 12

				4 1/2"	0.43"	0.203"	7/64"	Standard	7	Partially Threaded	Thread Cutting	17	10	000000000	000000




						No. 14

						4 1/2"	0.43"	0.25"	7/64"	Standard	10	Partially Threaded	Thread Cutting	17	10	000000000	00000


						316 Stainless Steel







										No. 12

										4 1/2"	0.43"	0.203"	7/64"	Standard	11	Partially Threaded	Thread Cutting	17	10	000000000	00000

Drywall Screws for Wood

Hang drywall to wood framing. These screws have a sharp point that penetrates drywall and a curved neck that sinks in without tearing the paper surface.

Zinc-Yellow-Chromate-Plated Steel—Zinc-yellow-chromate-plated steel screws are corrosion resistant in wet environments.

Length—Length is measured from the top of the head.

		Head		Drive
	Lg.	Dia.	Ht.	Size	Style	Approx. Threads per In.	Threading	Min. Thread Lg.	Pkg. Qty.		Pkg.
Zinc-Yellow-Chromate-Plated Steel







				No. 10 Screw Size

				4 1/2"	0.363"	0.039"	No. 2	Phillips	9	Partially Threaded	2 1/2"	25	000000000	000000

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.

	Threading	Tapping Method	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel







	1/4"

	4 1/2"	0.172"	10	Partially Threaded	Thread Forming	ASME B18.2.1	10	000000000	00000




			5/16"

			4 1/2"	0.219"	9	Partially Threaded	Thread Forming	ASME B18.2.1	10	000000000	00000




					3/8"

					4 1/2"	0.25"	7	Partially Threaded	Thread Forming	ASME B18.2.1	5	000000000	00000




							1/2"

							4 1/2"	0.344"	6	Partially Threaded	Thread Forming	ASME B18.2.1	1	000000000	0000


							316 Stainless Steel







											1/4"

											4 1/2"	0.172"	10	Partially Threaded	Thread Forming	ASME B18.2.1	5	000000000	0000




													5/16"

													4 1/2"	0.219"	9	Partially Threaded	Thread Forming	ASME B18.2.1	1	000000000	0000




															3/8"

															4 1/2"	0.25"	7	Partially Threaded	Thread Forming	ASME B18.2.1	1	000000000	0000




																	1/2"

4 1/2"																	0.344"	6	Partially Threaded	Thread Forming	ASME B18.2.1	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.

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	1 1/2"	4 1/2"	Not Rated	Not Rated	10	000000000	000000