Metallics BLS48PLB Bolts 3/8 x 4-1/2 Hx Lag Blt Pln-St (Box 225)

The BLS48PLB is a 3/8 inch diameter by 4-1/2 inch hex head lag bolt, sold in a box of 225. That box count is also the order minimum, so 225 pieces is the smallest quantity you buy.

It has a gimlet point and spaced lag threads, so it starts itself in soft wood, but a pilot hole is still the right practice at 3/8 inch to keep the member from splitting and to avoid snapping the shank. Thread pitch is 7 threads per inch, and the threaded body runs 0.482 to 0.515 inches over the thread crests, so size the pilot to the unthreaded shank, not to the thread diameter.

No. The BLS48PLB is plain (uncoated) steel, which means no corrosion protection. Keep it to dry interior framing, strut mounting, and backboard work. For exterior, treated lumber, or wet locations, order the hot-dip galvanized version of the same size from the BLS/JBLS series instead.

The hex head measures 0.725 to 0.750 inches across the flats, so a 3/4 inch socket or wrench is the right fit. An adjustable wrench works but a 3/4 socket on an impact driver is faster when you are running a box of 225.

60,000 psi minimum tensile strength, with a hardness of Rockwell B70 to B100, made from AISI 1006 to 1022 low carbon steel. That is standard commercial lag screw material, suitable for anchoring strut, hangers, and equipment into wood framing, but it is not a structural grade bolt and should not be substituted where a drawing calls for a graded cap screw.

The BLS48PLB is flagged compliant for both Buy American and ARRA. Country of origin is listed as multiple, so if your specification requires a single documented origin, confirm the origin on the lot you receive.

Dimensions follow ASME B18.2.1-1996, the standard for square and hex bolts and screws. If a submittal asks for lag screws to a recognized dimensional standard, that is the reference to cite, and it means the 3/4 inch across-flats head will match other B18.2.1 hardware on the job.

A washer is good practice under a hex lag head when you are clamping through strut, channel, or a metal bracket, so the head does not pull through or crush the wood. Washer OD is listed at 0.156 in. on the record; confirm washer sizing against the material you are fastening through, since washers are not supplied in the box of 225.

Other sizes and quantities in the BLS and JBLS lag bolt series are available by request. The BLS48PLB itself is one configuration: 3/8 x 4-1/2, plain steel, boxed 225.

About 25.45 lbs for the full box of 225. Worth knowing if you are staging material on a lift or carrying boxes up to a roof, and it is one box per order minimum.