Metallics JG8HC40 Bolts 5/16-1...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
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Metallics JG8HC40 Bolts 5/16-18 x 1/2 G8 HXBT St-zn (Jar 100)

Metallics JG8HC40 Bolts 5/16-18 x 1/2 G8 HXBT St-zn (Jar 100)

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Model: JG8HC40
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$50.61
$0.61
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Bolts 5/16-18 x 1/2 G8 HXBT St-zn (Jar 100)

  • Additional Notes

    • Other sizes and quantities available by request

  • Features

    • Used in automotive and fleet industries, where greater tensile strength is required than can be met by a Grade-5
    • A cap screw made from medium carbon steel and heat-treated

Manufacturer Resources

Product Specs

Arra Compliant:
N
Buy American Compliant:
No
Division:
Electrical H1
Fastener Head Height:
Jul-32 in.
Fastener Head Type:
Hex
Fastener Head Width:
0.489 - 0.500 in.
Fastener Height:
0.195 - 0.211
Fastener Length:
2-Jan
Fastener Width:
0.552 - 0.577
Grade:
8
Hardness:
Rockwell C33-39
Language Code:
EN
Material Standard:
AISI 1021 - 1045
Order Minimum Imperial:
100
Order Minimum Uom Imperial:
CT
Outside Diameter:
0.3065 - 0.3125 IN
Pack Type:
Jar
Product Group:
Fasteners
Sub Division:
Electrical-E H2
Tensile Strength:
150000 psi minimum
Thread Per Inch:
18
Yield Strength:
130000 psi minimum
Department:
Electrical
Product Subgroup:
Bolts
Product Type:
Hexagonal Bolt
Type2:
Hexagonal Bolt
Series:
G8HC and JG8HC
Product Finish:
Zinc
Product Details:
Hexagonal Bolt
Product Material:
Steel

Metallics JG8HC40 – Frequently Asked Questions

1) What thread size and pitch is the Metallics JG8HC40 hex bolt, and what nut do I need with it?
The JG8HC40 is a 5/16-18 hex cap screw, so it's a 5/16 inch diameter with 18 threads per inch, which is standard coarse (UNC) pitch. Measured shank diameter runs 0.3065 to 0.3125 inch. Pair it with a 5/16-18 coarse nut; a Grade 8 bolt should be run with a hardened nut (Grade 8 or Class 8 equivalent) so the nut doesn't strip before the bolt reaches its rated load.
2) How much material can a 1/2 inch long 5/16 bolt actually clamp?
At 1/2 inch of length under the head, the JG8HC40 is a short bolt. Deduct whatever washer and nut you're using and you're clamping well under 1/2 inch of stack, so it suits thin plate-to-plate joints or threading into a tapped hole with limited depth. For anything thicker, step up to a longer length in the same G8HC/JG8HC series rather than trying to make this one reach.
3) Do these bolts qualify for a Buy American or ARRA funded project?
No. The Metallics JG8HC40 Grade 8 hex bolt is not Buy American compliant and is not ARRA compliant, with country of origin listed as multiple. If you're procuring for a federally funded job with domestic sourcing requirements, you'll need a domestically produced Grade 8 fastener instead.
4) Will zinc-plated Grade 8 bolts hold up outdoors or in a wet location?
The JG8HC40 is medium carbon steel with a zinc finish, which handles indoor, enclosed, and incidental-moisture service. Zinc plating on a heat-treated Grade 8 is not a marine or constant-wet coating, and hardened steel at Rockwell C33-39 is the class most prone to hydrogen embrittlement, so for sustained outdoor or chemical exposure a stainless or hot-dip galvanized structural fastener is the better call.
5) How are these Metallics Grade 8 bolts packaged, and is there a minimum order?
They ship in a jar of 100 pieces, and 100 count is the order minimum, so a jar is the smallest unit. That packaging suits a service truck or shop bin rather than a one-off repair.
6) What steel are Metallics Grade 8 hex cap screws made from?
Material standard is AISI 1021 to 1045, a medium carbon steel range, and the bolts are heat-treated to reach Grade 8 properties. That's what gets you the 150,000 psi minimum tensile. It also means they should not be welded or re-heated, since heat work destroys the temper and drops the bolt below its rated strength.
How fast can I get the Metallics JG8HC40 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
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 JG8HC40 come with a warranty?
Absolutely. The Metallics JG8HC40 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Metallics JG8HC40?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Metallics JG8HC40 from ZenSupply?
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