Galvanized Lag Screws | McMaster-Carr

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Hot-Dipped Galvanized

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89 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.

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.

	Lg.	Head Ht.	Approx. Threads per In.	Threading	Tapping Method	Specs. Met	Pkg. Qty.		Pkg.
Hot-Dipped Galvanized Steel







				1/4"

				1"	0.172"	10	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	100	94048A212	000000


				1 1/4"	0.172"	10	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	100	94048A215	00000
				1 1/2"	0.172"	10	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	100	94048A218	00000
				2"	0.172"	10	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	100	94048A221	00000
				2 1/2"	0.172"	10	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	50	94048A224	00000
				3"	0.172"	10	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	50	94048A227	00000
				3 1/2"	0.172"	10	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	50	94048A230	00000
				4"	0.172"	10	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	50	94048A233	00000
				4 1/2"	0.172"	10	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	25	94048A236	00000
				5"	0.172"	10	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	25	94048A239	00000
				5 1/2"	0.172"	10	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	25	94048A411	00000


				6"	0.172"	10	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	25	94048A245	00000




						5/16"

						1"	0.219"	9	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	50	94048A248	00000


						1 1/4"	0.219"	9	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	50	94048A251	00000
						1 1/2"	0.219"	9	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	50	94048A254	00000
						2"	0.219"	9	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	50	94048A257	00000
						2 1/2"	0.219"	9	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	50	94048A260	00000
						3"	0.219"	9	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	50	94048A263	00000
						3 1/2"	0.219"	9	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	25	94048A266	00000
						4"	0.219"	9	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	25	94048A269	00000
						4 1/2"	0.219"	9	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	25	94048A274	00000
						5"	0.219"	9	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	25	94048A275	00000
						6"	0.219"	9	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	25	94048A278	00000




								3/8"

								1"	0.25"	7	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	50	94048A412	00000


								1 1/4"	0.25"	7	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	50	94048A281	00000
								1 1/2"	0.25"	7	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	50	94048A284	00000
								1 3/4"	0.25"	7	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	50	94048A287	00000
								2"	0.25"	7	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	50	94048A290	00000
								2 1/2"	0.25"	7	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	25	94048A293	00000
								3"	0.25"	7	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	25	94048A296	00000
								3 1/2"	0.25"	7	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	25	94048A299	00000
								4"	0.25"	7	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	25	94048A302	00000
								4 1/2"	0.25"	7	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	10	94048A305	00000
								5"	0.25"	7	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	10	94048A308	00000


5 1/2"	0.25"							7	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	10	94048A413	00000
6"	0.25"							7	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	10	94048A314	00000
7"	0.25"							7	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	10	94048A317	00000
8"	0.25"							7	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	10	94048A320	00000
9"	0.25"	7						Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	5	94048A414	00000
10"	0.25"	7	Partially Threaded					Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	5	94048A324	00000
12"	0.25"	7	Partially Threaded					Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	5	94048A415	00000




		1/2"

		2"	0.344"					6	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	10	94048A329	0000


		2 1/2"	0.344"					6	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	10	94048A332	00000
		3"	0.344"					6	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	10	94048A335	00000
		3 1/2"	0.344"					6	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	10	94048A338	00000
		4"	0.344"					6	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	10	94048A341	00000
		4 1/2"	0.344"					6	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	10	94048A344	00000
		5"	0.344"					6	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	10	94048A347	00000
		5 1/2"	0.344"					6	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	5	94048A416	00000
		6"	0.344"					6	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	5	94048A353	00000
		7"	0.344"					6	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	5	94048A356	00000
		8"	0.344"					6	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	5	94048A359	00000


		9"	0.344"	6	Partially Threaded			Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	1	94048A417	0000
		10"	0.344"	6	Partially Threaded			Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	1	94048A363	0000
		12"	0.344"	6	Partially Threaded			Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	1	94048A366	0000




				5/8"

				2 1/2"	0.422"			5	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	5	94048A418	00000


				3"	0.422"			5	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	5	94048A374	00000
				4"	0.422"			5	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	5	94048A380	00000
				4 1/2"	0.422"			5	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	5	94048A421	00000
				5"	0.422"			5	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	5	94048A386	00000
				6"	0.422"			5	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	1	94048A389	0000
				7"	0.422"			5	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	1	94048A392	0000
				8"	0.422"			5	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	1	94048A396	0000
				10"	0.422"	5		Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	1	94048A399	0000
				12"	0.422"	5	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	1	94048A402	00000
				16"	0.422"	5	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	1	94048A423	00000




						3/4"

						4"	0.5"	4 1/2	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	1	94048A404	0000


						5"	0.5"	4 1/2	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	1	94048A407	0000
						6"	0.5"	4 1/2	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	1	94048A410	0000
						7"	0.5"	4 1/2	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	1	94048A420	0000
						8"	0.5"	4 1/2	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	1	94048A430	00000
						10"	0.5"	4 1/2	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	1	94048A440	00000
						12"	0.5"	4 1/2	Partially Threaded	Thread Forming	ASME B18.2.1, ASTM A307, SAE J429	1	94048A450	00000

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 are often used to secure wooden posts and beams because their coarse threads dig in. 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.

	Approx. Threads per In.	Threading	Tapping Method	Specs. Met	Pkg. Qty.		Pkg.
Hot-Dipped Galvanized Steel







	1/4"

	1"	0.28"	0.56"	10	Fully Threaded	Thread Forming	ASTM A153	100	95526A100	000000


	1 1/2"	0.28"	0.56"	10	Partially Threaded	Thread Forming	ASTM A153	50	95526A125	00000
	2"	0.28"	0.56"	10	Partially Threaded	Thread Forming	ASTM A153	50	95526A150	00000
	2 1/2"	0.28"	0.56"	10	Partially Threaded	Thread Forming	ASTM A153	50	95526A175	00000
	3"	0.28"	0.56"	10	Partially Threaded	Thread Forming	ASTM A153	50	95526A200	00000




			5/16"

			1"	0.32"	0.68"	9	Fully Threaded	Thread Forming	ASTM A153	50	95526A325	00000


			1 1/2"	0.32"	0.68"	9	Partially Threaded	Thread Forming	ASTM A153	50	95526A350	00000
			2"	0.32"	0.68"	9	Partially Threaded	Thread Forming	ASTM A153	50	95526A375	00000
			2 1/2"	0.32"	0.68"	9	Partially Threaded	Thread Forming	ASTM A153	25	95526A400	00000




					3/8"

					1 1/2"	0.39"	0.81"	7	Partially Threaded	Thread Forming	ASTM A153	25	95526A500	00000


					2"	0.39"	0.81"	7	Partially Threaded	Thread Forming	ASTM A153	25	95526A525	00000
					2 1/2"	0.39"	0.81"	7	Partially Threaded	Thread Forming	ASTM A153	25	95526A550	00000
					3"	0.39"	0.81"	7	Partially Threaded	Thread Forming	ASTM A153	25	95526A575	00000
					4"	0.39"	0.81"	7	Partially Threaded	Thread Forming	ASTM A153	10	95526A600	00000
					5"	0.39"	0.81"	7	Partially Threaded	Thread Forming	ASTM A153	5	95526A601	0000
					6"	0.39"	0.81"	7	Partially Threaded	Thread Forming	ASTM A153	5	95526A602	00000