Lag Screws

Heavy-duty hex-head fasteners for structural wood-to-wood and wood-to-substrate connections — ledger boards, post bases, deck framing, fence posts, and timber framing. Driven with a wrench, socket, or impact driver rather than a screwdriver bit. Standard hex, indented hex, SEMS (captive washer), and SpinLock profiles in plain, zinc, and hot-dipped galvanized.

HXLAG HEX LAG

25 SKUs

Hex Lag. The standard structural lag screw — hex head, coarse wood threads, driven with a wrench or socket. Sizes from 5/16″ through 1/2″ diameter, 2″ through 12″ lengths, in plain, zinc, and hot-dipped galvanized.

Pick #	Item No.	Length	Thread	Thread Len	Point	Finish	Qty/Ctn
42625	U3/8X10HEXLAG-P	10"	3/8	—	—	Plain	—
42650	U3/8X12HEXLAG-HDG	12"	3/8	—	—	Hot Dipped Galvanized	—
42225	U3/8X2-1/2HEXLAG-P	2-1/2"	3/8	—	—	Plain	—
42250	U3/8X2-1/2HEXLAG-Z	2-1/2"	3/8	—	—	Zinc	—
42700	U1/2X3-1/2HEXLAG-P	3-1/2"	1/2	—	—	Plain	—
42275	U3/8X3HEXLAG-P	3"	3/8	—	—	Plain	800
42300	U3/8X3HEXLAG-Z	3"	3/8	—	—	Zinc	500
42325	U3/8X4HEXLAG-HDG	4"	3/8	—	—	Hot Dipped Galvanized	—
42350	U3/8X4HEXLAG-P	4"	3/8	—	—	Plain	400
42415	U3/8X5HEXLAG-HDG	5"	3/8	—	—	Hot Dipped Galvanized	—
42400	U3/8X5HEXLAG-P	5"	3/8	—	—	Plain	250
42450	U3/8X6HEXLAG-HDG	6"	3/8	—	—	Hot Dipped Galvanized	250
42475	U3/8X6HEXLAG-P	6"	3/8	—	—	Plain	250
42525	U3/8X7HEXLAG-HDG	7"	3/8	—	—	Hot Dipped Galvanized	—
42500	U3/8X7HEXLAG-P	7"	3/8	—	—	Plain	250
42575	U3/8X8HEXLAG-P	8"	3/8	—	—	Plain	250
42600	U3/8X9HEXLAG-P	9"	3/8	—	—	Plain	—
42075	U5/16X2-1/2HEXLAG-Z	2-1/2"	5/16	—	—	Zinc	—
42072	U5/16X2HEXLAG-HDG	2"	5/16	—	—	Hot Dipped Galvanized	—
42070	U5/16X2HEXLAG-Z	2"	5/16	—	—	Zinc	—
42125	U5/16X3-1/2HEXLAG-P	3-1/2"	5/16	—	—	Plain	—
42100	U5/16X3HEXLAG-P	3"	5/16	—	—	Plain	—
42150	U5/16X4HEXLAG-P	4"	5/16	—	—	Plain	—
42175	U5/16X5HEXLAG-P	5"	5/16	—	—	Plain	350
42200	U5/16X6HEXLAG-P	6"	5/16	—	—	Plain	—

INDLAG INDENTED HEX LAG

1 SKU

Indented Hex Lag. Same structural profile as HXLAG with an indented (recessed) hex head — sometimes specified for keyed installations or where a slightly lower head profile is needed.

Pick #	Item No.	Length	Thread	Thread Len	Point	Finish	Qty/Ctn
45200	U3/8X3-IND-HEXLAG-P	3"	3/8	—	—	Plain	500

SEMSLAG HEX WASHER SEMS LAG

1 SKU

Hex Washer SEMS Lag. Lag screw with a permanently attached (SEMS) washer under the head — the washer can’t be lost in the field and distributes load without a separate part.

Pick #	Item No.	Length	Thread	Thread Len	Point	Finish	Qty/Ctn
44200	U5/16X3H/W-SEMS-LAG-HDG	3"	5/16	—	—	Hot Dipped Galvanized	—

SLLAG SPINLOCK LAG

10 SKUs

SpinLock Lag. Hex-washer head with an integral load-spreading flange — popular for fence posts, ledger boards, and exterior framing. Available in 5/16″ and 3/8″ diameter, plus 9mm metric.

Pick #	Item No.	Length	Thread	Thread Len	Point	Finish	Qty/Ctn
43150	U5/16X4H/W-S/L-LAG-P	4"	5/16	—	—	Plain	—
43300	U3/8X4H/W-S/L-LAG-P	4"	3/8	—	—	Plain	300
43075	U5/16X3H/W-S/L-LAG-E/G	3"	5/16	—	—	Electro Galvanized	—
43100	U5/16X3H/W-S/L-LAG-HDG	3"	5/16	—	—	Hot Dipped Galvanized	—
43050	U5/16X3H/W-S/L-LAG-Z	3"	5/16	—	—	Zinc	—
43175	U3/8X3H/W-S/L-LAG-P	3"	3/8	—	—	Plain	250
43200	U3/8X3H/W-S/L-LAG-Z	3"	3/8	—	—	Zinc	250
43325	U9MMX76MM-H/W-S/L-LG-P	76MM	9MM	—	—	U9MMX76MM Plain	500
43330	U9MMX76MM-H/W-S/L-LG-Z	76MM	9MM	—	—	U9MMX76MM ZINC	500
250	U9MMX76MM-HW-S/L-LG-HDG43350	76MM	9MM	—	—	U9MMX76MM Hot Dipped Galvanized	—