Metallics JG8HC42 Bolts 5/16-1...
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Metallics JG8HC42 Bolts 5/16-18 X 3/4 G8 Hxbt St-zn (Jar 100)

Metallics JG8HC42 Bolts 5/16-18 X 3/4 G8 Hxbt St-zn (Jar 100)

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Model: JG8HC42
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$50.61
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Bolts 5/16-18 X 3/4 G8 Hxbt St-zn (Jar 100)

  • 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

  • Additional Notes

    • Other sizes and quantities available by request

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:
4-Mar
Fastener Width:
0.552 - 0.577
Field Application:
Electrical, Plumbing, Heating and Air Conditioning Industries
Grade:
8
Hardness:
Rockwell C33-39
Language Code:
EN
Material Standard:
AISI 1021 - 1045
Neurspe:
https://ideadigitalasset.com/DAMRoot/Original/10035/11237_ID-SPE-v1-ID-SPE-v1-Gr_8_Hex_Bolt_St-Zn.pdf
Order Minimum Imperial:
100
Order Minimum Uom Imperial:
JR
Outside Diameter:
0.3065 - 0.3125 IN
Pack Type:
Jar
Product Group:
Fasteners
Product Height:
3.6 in
Product Length:
3 in
Product Weight:
1116 g
Product Width:
76.2 MM
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 JG8HC42 – Frequently Asked Questions

1) Is a Grade 8 bolt worth it over a Grade 5 for strut, hanger and equipment mounting?
Grade 8 is the move when the joint sees higher clamp load or shock than a Grade 5 can carry. The JG8HC42 is medium carbon steel, heat treated, rated 150,000 psi minimum tensile and 130,000 psi minimum yield, with a hardness of Rockwell C33-39. For light strut and general hanger work a Grade 5 is usually enough; for fleet, equipment anchoring and high-vibration mechanical connections the Grade 8 gives you the margin.
2) Do Metallics Grade 8 hex bolts meet Buy American or ARRA requirements on a public project?
No. The JG8HC42 is not Buy American compliant and is not ARRA compliant, with multiple countries of origin. For federally funded work carrying domestic sourcing clauses, specify a domestic fastener instead.
3) What size wrench or socket fits a Metallics Grade 8 5/16-18 hex bolt?
The hex head measures 0.489 to 0.500 inch across the flats, so a 1/2 inch wrench or socket is the right tool. Head type is a standard hex cap screw head.
4) Can I use these zinc plated Grade 8 bolts outdoors or in a wet mechanical room?
The finish is zinc plating over steel, which handles indoor and sheltered conditions and incidental moisture. It is not a stainless or hot-dip product, so for direct weather exposure, coastal air, or anything submerged or chronically damp, choose a stainless or hot-dip galvanized fastener instead. Note also that Grade 8 plated bolts should not be substituted into applications calling for a corrosion-resistant grade.
5) How many bolts come in a jar of Metallics JG8HC42, and can I buy fewer?
These ship 100 to a jar, and the jar is the minimum order unit, so 100 pieces is the smallest buy. The full jar weighs 1116 g. Other sizes and quantities in the G8HC/JG8HC Grade 8 hex bolt series can be requested.
6) What grip length will a 3/4 inch long 5/16-18 Grade 8 bolt actually give me?
At 3/4 inch overall length under the head, the JG8HC42 is a short cap screw suited to thin assemblies, strut clamps, brackets and tapped holes. Figure your material stack plus washers plus full nut engagement inside that 3/4 inch; if you are stacking more than about half an inch of material, step up to a longer length in the same series.
7) What steel are these Grade 8 bolts made from?
Medium carbon steel to AISI 1021-1045, heat treated, then zinc plated. That material and heat treat is what produces the Rockwell C33-39 hardness and the 150,000 psi tensile rating.
8) Are these bolts suitable for electrical and HVAC trade work, or are they automotive only?
Both. Metallics lists the Grade 8 hex bolt line for electrical, plumbing, heating and air conditioning work, and the same bolt is used in automotive and fleet applications where a Grade 5 does not give enough tensile strength.
How fast can I get the Metallics JG8HC42 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 JG8HC42 come with a warranty?
Absolutely. The Metallics JG8HC42 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 JG8HC42?
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 JG8HC42 from ZenSupply?
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