Metallics JBBH8 Bolts 1/4-20 x 4 HXBT Sbr (Jar 100)

The JBBH8 is a 1/4-20 x 4 inch hex bolt, so 20 threads per inch on a 1/4 inch diameter, cut to ANSI/ASME B1.1. Any standard 1/4-20 nut or tapped 1/4-20 hole will take it. Head dimensions follow ASME B18.2.1, with a head width across flats of 0.428 to 0.438 in. and a head height of 0.150 to 0.163, so a 7/16 wrench or socket is what you need on the job.

Silicon bronze is the reason to pick the JBBH8. The bolt is solid silicon bronze to ASTM F468, which is the standard for nonferrous bolting, so it resists corrosion in wet, coastal, and buried conditions where plated or galvanized steel eventually rusts out. It also avoids the galvanic problem of putting steel against copper or bronze hardware, grounding conductors, copper pipe, or bronze castings. If the connection is dry interior framing and nothing copper is involved, plated steel is the cheaper answer and this is more bolt than the job needs.

No. The JBBH8 is flagged not Buy American compliant and not ARRA compliant, with country of origin listed as multiple. If your contract carries a domestic-sourcing clause, this part will not satisfy it and you need a domestically produced silicon bronze bolt instead.

It comes 100 bolts to a jar, and the jar is the order unit, so one jar of 100 is the minimum. The packed jar weighs 5.34 lbs. The jar pack is what makes this practical for a service van or a shop bin rather than a bulk box.

No. The jar contains 100 hex bolts only. You will need to order matching 1/4-20 nuts and 1/4 washers separately, and for corrosion work they should be silicon bronze or bronze as well, since pairing a steel nut with a bronze bolt reintroduces the galvanic couple you bought bronze to avoid.

Metallics lists the BBH and JBBH hex bolts for the electrical, plumbing, and heating and air conditioning trades. Typical use is bonding and grounding connections, bronze or copper pipe supports, and any mounting where the fastener sits against copper alloy or in a damp location. The bolt finishes bronze, so it also blends with bronze hardware rather than standing out as plated steel would.

It is a hex bolt built to ASME B18.2.1 with a hex head, in the 1/4-20 x 4 inch size. Hex bolts at a 4 inch length in this standard carry a shoulder with a threaded portion toward the point rather than thread running the full shank, so plan on the threads engaging at the nut end. If you need thread along the entire length for a through-bolted stack with intermediate nuts, a 1/4-20 threaded rod cut to length is the better part.