Metallics JBLS44 Bolts 5/16 x 4-1/2 Hx Lag Blt St-zn (Jar 50)

No. The JBLS44 is a zinc plated steel lag bolt intended for use in wood in non-corrosive environments. Zinc plating handles dry interior work, but for exterior, damp, or treated-lumber contact you want hot dip galvanized or 18-8 stainless lags instead, since plated steel will corrode and treated lumber chemistry attacks it.

The JBLS44 has a gimlet point, so it starts itself, but at a 0.298 to 0.324 inch outside diameter with 9 threads per inch it still needs a pilot hole in anything but soft, thin wood. Drill the clearance hole through the piece being fastened at full shank diameter, then a smaller lead hole into the receiving member so the spaced threads can bite. Driving a 5/16 lag dry into dense framing without a lead hole is how heads snap.

No. The JBLS44 is not Buy American compliant and is not ARRA compliant, with country of origin listed as multiple. If your contract carries a domestic sourcing clause, this jar will not satisfy it and you need a domestically sourced lag instead.

The JBLS44 ships as a 50 piece jar, and 50 each is the order minimum, so it is sold by the jar rather than loose by the piece. The jar packaging suits a van or shop shelf where you are pulling a handful at a time on service calls.

Not on its own. The JBLS44 is a wood lag, specified for use in wood, with spaced threads and a gimlet point. To land it in concrete or block you need a lag shield or lead anchor sized for a 5/16 lag set into the masonry first. For bare concrete, a wedge anchor or screw anchor is the correct fastener, not a lag.

The jar contains the lag bolts only, no washers. On wood you generally want a flat washer under the hex head so the head does not crush into the grain as you torque it; order those separately to suit the 5/16 shank.