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Bolts 5/16-18 x 4 HXBT Sbr (Jar 100)
Additional Notes
- Other sizes and quantities available by request
Manufacturer Resources
Product Specs
- Arra Compliant:
- N
- Buy American Compliant:
- No
- Dimensional Standard:
- ASME B18.2.1
- Division:
- Electrical H1
- Fastener Head Type:
- Hex
- Fastener Head Width:
- 0.489 - 0.500 in.
- Fastener Height:
- 0.195 - 0.211
- Fastener Length:
- 4
- Field Application:
- Electrical, Plumbing, Heating and Air Conditioning Industries
- Language Code:
- EN
- Material Standard:
- ASTM F468
- Order Minimum Imperial:
- 100
- Order Minimum Uom Imperial:
- JR
- Pack Type:
- Jar
- Product Group:
- Fasteners
- Product Height:
- 7.25 in
- Product Length:
- 4.5 in
- Product Weight:
- 7.25 lbs
- Product Width:
- 4.5 in
- Sub Division:
- Electrical-E H2
- Thread Per Inch:
- 18
- Thread Standard:
- ANSI/ASME B1.1
- Department:
- Electrical
- Product Subgroup:
- Bolts
- Product Type:
- Hexagonal Bolt
- Type2:
- Hexagonal Bolt
- Series:
- BBH and JBBH
- Product Finish:
- Bronze
- Product Details:
- Hexagonal Bolt
- Product Material:
- Silicon Bronze
Metallics JBBH18 – Frequently Asked Questions
1) What thread does the Metallics JBBH18 5/16 x 4 hex bolt use, and will it take a standard 5/16-18 nut?
It's a 5/16-18 thread, 18 threads per inch, cut to ANSI/ASME B1.1. That is standard UNC coarse for 5/16, so any off-the-shelf 5/16-18 nut or tapped 5/16-18 hole will mate with it. Head and body dimensions follow ASME B18.2.1, so a standard 1/2 inch wrench or socket fits the hex (head width 0.489 to 0.500 in.).
2) Is this a silicon bronze bolt or just a bronze-finished steel bolt?
Solid silicon bronze, not plated steel. The material is silicon bronze to ASTM F468, and the bronze appearance is the metal itself. That matters if you're bolting into copper, bronze, or brass components where you want to avoid the galvanic mismatch you get from steel hardware.
3) Will these silicon bronze hex bolts satisfy a Buy American or ARRA requirement on a government job?
No. The JBBH18 is not Buy American compliant and is not ARRA compliant, and country of origin is listed as multiple. If your contract carries a domestic-content clause, these will not qualify and you need a domestically sourced bronze fastener instead.
4) How long is the JBBH18 bolt and what grip length can I expect?
The bolt is 4 inches long under the head, with a head height of 0.195 to 0.211 inches. Measure your stack-up plus enough protrusion for the nut and washers to land inside that 4 inches.
5) How are these 5/16-18 x 4 bronze bolts packaged, and is there a minimum order?
They ship in a jar of 100, and the jar is the order unit, so 100 pieces is the minimum. Jar weight is 7.25 lbs. Other sizes and quantities are available by request.
6) What are silicon bronze hex bolts used for on electrical and mechanical work?
Metallics lists the application as the electrical, plumbing, heating and air conditioning trades. In practice that's grounding and bonding connections, strut and hanger assembly, and anywhere a copper or bronze connector would corrode against a steel bolt. The 5/16-18 x 4 size gives enough length for stacked lugs, straps, or thick members.
7) Do nuts and washers come with these bronze bolts?
No, the jar contains 100 bolts only. You'll need to order 5/16-18 nuts and 5/16 washers separately, and in silicon bronze if you want to keep the whole joint on the same metal.
8) What size wrench fits the hex head on the Metallics JBBH18?
Standard hex head with an across-flats width of 0.489 to 0.500 inches, so a 1/2 inch wrench or socket is the right tool. The head conforms to ASME B18.2.1 dimensions, which is what a 5/16 hex cap screw should measure.
How fast can I get the Metallics JBBH18 delivered?
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Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Metallics JBBH18 come with a warranty?
Absolutely. The Metallics JBBH18 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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