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Metallics JG8HC43 Bolts 5/16-18 X 1 G8 Hxbt St-zn (Jar 100)
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Metallics JG8HC42 Bolts 5/16-18 X 3/4 G8 Hxbt St-zn (Jar 100)
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Bolts 5/16-18 x 7/8 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:
- 8-Jul
- 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:
- 1202 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 JG8HC17 – Frequently Asked Questions
1) Is a Grade 8 bolt stronger than the Grade 5 bolts I normally stock?
Yes, noticeably. This is a Grade 8 cap screw rated at 150,000 psi minimum tensile and 130,000 psi minimum yield, with hardness Rockwell C33-39. Grade 5 runs well below that. It is the fastener to use where a Grade 5 will not carry the load, which is why these get used in automotive and fleet work. The tradeoff is that Grade 8 is harder and less ductile, so it is less forgiving of shock and misalignment.
2) Can I use the Metallics JG8HC17 on a federally funded or Buy American job?
No. These Grade 8 hex bolts are not Buy American compliant and are not ARRA compliant, and country of origin is listed as multiple. If your project carries a domestic sourcing requirement, you need a domestically produced fastener instead.
3) What size wrench or socket fits the head on this 5/16-18 Grade 8 hex bolt?
Head width across the flats is 0.489 to 0.500 inch, so a 1/2 inch wrench or socket is the right tool.
4) How many bolts come in a jar, and can I order just a handful?
These ship as a jar of 100, and the jar is the order minimum, so 100 pieces is the smallest buy. The filled jar weighs 1202 g. Metallics does make other sizes and quantities available by request.
5) Will a zinc plated Grade 8 bolt hold up outdoors or in a damp mechanical room?
The JG8HC17 is medium carbon steel with a zinc finish. Zinc plating handles indoor and sheltered damp conditions, which covers typical electrical, plumbing and HVAC work. For direct weather exposure, salt, or coastal air, zinc plated carbon steel is not the right call long term, and heat-treated Grade 8 steel is also susceptible to hydrogen embrittlement, so stainless or hot dip galvanized is the better choice in those spots.
6) Will a 7/8 inch long bolt be long enough for my strut and bracket stack?
At 7/8 inch overall shank length, the usable grip after a nut and washers is short. Figure the thickness of everything you are clamping plus enough thread for the nut to fully engage. On a 5/16-18 bolt that means roughly 5/16 inch of thread into the nut, which leaves about half an inch of grip. Thicker stacks need a longer bolt in the same G8HC and JG8HC series.
7) What steel is this Grade 8 cap screw made from?
Material standard is AISI 1021 to 1045, a medium carbon steel, heat treated to reach Grade 8 properties at Rockwell C33-39 hardness. That is the usual spec basis for an SAE Grade 8 cap screw rather than an alloy steel structural bolt.
How fast can I get the Metallics JG8HC17 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
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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 JG8HC17 come with a warranty?
Absolutely. The Metallics JG8HC17 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 JG8HC17?
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