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Metallics JG8HC416 Bolts 5/16-18 x 3-1/2 G8 HXBT St-zn (Jar 50)
Model: MET-JG8HC416
Bolts 5/16-18 x 3-1/2 G8 HXBT St-zn (Jar 50)
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...
Metallics
$51.97
$1.93
Bolts 5/16-18 X 2-1/2 G8 Hxbt St-zn (Jar 50)
Features
- A cap screw made from medium carbon steel and heat-treated
- Used in automotive and fleet industries, where greater tensile strength is required than can be met by a Grade-5
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:
- 2/1/02
- 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:
- 50
- Order Minimum Uom Imperial:
- EA
- Outside Diameter:
- 0.3065 - 0.3125 IN
- Pack Type:
- Jar
- Product Group:
- Fasteners
- Product Height:
- 5.75 in
- Product Length:
- 3.5 in
- Product Weight:
- 1406 g
- Product Width:
- 88.9 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 JG8HC15 – Frequently Asked Questions
1) Will a 5/16-18 Grade 8 hex bolt take a standard 5/16-18 nut?
Yes. The Metallics JG8HC15 is cut 18 threads per inch on a 5/16 diameter, which is the standard UNC coarse thread for that size, so any 5/16-18 nut or tapped hole mates with it. Measured shank diameter runs 0.3065 to 0.3125 inch.
2) How much stronger is a Grade 8 bolt than a Grade 5, and when do I actually need it?
Grade 8 steel here is rated 150,000 psi minimum tensile and 130,000 psi minimum yield, hardened to Rockwell C33-39. Grade 5 tops out lower, so the Grade 8 is what you reach for on vibrating equipment mounts, fleet and automotive work, and any joint where the bolt is carrying real clamp load. For general bracket and strut work a Grade 5 is usually enough and easier on threads if you are reusing the hole.
3) Can I use these bolts on a federally funded or Buy American job?
No. The JG8HC15 Grade 8 hex bolts are flagged not Buy American compliant and not ARRA compliant, with multiple countries of origin. If your contract carries domestic sourcing requirements, you need a domestically produced fastener instead.
4) What wrench or socket size fits the head on this Metallics Grade 8 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 size.
5) Is a zinc-plated Grade 8 bolt OK for outdoor or damp mechanical room use?
The bolt is medium carbon steel with a zinc finish, which handles indoor and sheltered conditions and incidental moisture. It is not stainless, so for continuous exposure, washdown areas, or coastal installations plan on a corrosion-resistant fastener instead. Zinc plating on heat-treated Grade 8 also means keeping it out of high-heat applications.
6) How does the JG8HC15 ship, and what is the minimum I can buy?
It ships as a jar of 50 pieces, and 50 each is the order minimum. Total weight for the jar is 1406 g. Metallics notes other sizes and quantities in the G8HC and JG8HC series are available by request.
7) Are these bolts suitable for electrical and HVAC equipment mounting, or are they an automotive-only part?
Both. Metallics lists the field application as the electrical, plumbing, heating and air conditioning industries, and the bolt is also used in automotive and fleet work where Grade 5 strength is not enough. Common uses are hanging and anchoring heavy equipment, compressor and motor mounts, and structural brackets.
8) What steel are these Metallics Grade 8 hex bolts made from?
Material is AISI 1021 to 1045 medium carbon steel, heat-treated to reach Grade 8 properties at Rockwell C33-39. That grade of steel is why the bolt will hold 150,000 psi minimum tensile but should not be re-tempered by welding or torch heat.
How fast can I get the Metallics JG8HC15 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 JG8HC15 come with a warranty?
Absolutely. The Metallics JG8HC15 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 JG8HC15?
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