Metallics JBLS11G Bolts 5/16 X 1-1/2 Hx Lag Blt Galv (Jar 100)

The JBLS11G is a 5/16 inch diameter by 1-1/2 inch hex head lag bolt, galvanized, packed 100 to a jar. Order minimum is one 100-count jar. Measured shank outside diameter runs 0.298 to 0.324 inch, which is the normal range for a nominal 5/16 lag.

Yes. The galvanized steel finish on these 5/16 lag bolts is specifically intended for corrosive environments, so exterior framing, damp vaults, and wet mechanical spaces are the normal use. The base steel is AISI 1006-1022 carbon steel.

Metallics lists the JBLS11G as both ARRA compliant and Buy American compliant. Country of origin is China. If your specification requires domestic melt and manufacture rather than compliance by category, confirm the exact clause language your contract uses before you submit.

The JBLS11G has a gimlet point, so it starts itself in soft wood, but a pilot hole is still the right practice in dense lumber or near an edge. Size the pilot off the thread profile: 9 threads per inch on a shank measuring 0.298 to 0.324 inch. Drive it with a wrench or socket on the hex head, not a screwdriver.

Across the flats the head measures 0.484 to 0.500 inch, so a 1/2 inch socket or wrench is the fit. That is a nut driver size most electricians and framers already have on the belt.

The steel carries a minimum tensile strength of 60,000 psi with a hardness of Rockwell B70 to B100. Actual holding power in service is governed by the wood or substrate and the embedment depth, not the bolt, and at 1-1/2 inches overall length the usable embedment is short, so these are for mounting straps, clips, boxes, and brackets rather than deep structural anchorage.

Dimensions follow ASME B18.2.1-1996, which is the standard for hex bolts and lag screws. Any other 5/16 by 1-1/2 lag built to that standard will have the same head and thread geometry, so you can mix brands on the same job and use the same 1/2 inch driver.

The BLS and JBLS series covers other sizes and quantities, available by request. The JBLS prefix is the jar-packed count; bulk BLS packaging is the other half of the series. Tell us the diameter, length, and count you need and it can be sourced from the same family in the same galvanized finish.

A lag screw like the JBLS11G threads directly into wood and needs access from one side only, so it suits strapping conduit to joists, hanging brackets off blocking, and fastening into studs. If you are clamping two drilled members together you want a machine bolt with a nut and washer instead. For masonry or concrete you need a concrete anchor, not a lag; the gimlet point and spaced wood threads here will not hold in cured concrete.

A full jar runs 3.33 lbs. The jar itself measures 3.5 by 3.5 by 5.75 inches, which fits a standard van shelf bin without repackaging.