Metallics JG8HC251 Bolts 3/8-2...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$52.40
$3.86
Metallics JG8HC251 Bolts 3/8-24 x 2-1/2 G8 HXBT St-zn (Jar 100)

Metallics JG8HC251 Bolts 3/8-24 x 2-1/2 G8 HXBT St-zn (Jar 100)

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Model: JG8HC251
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$52.40
$3.86
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Bolts 3/8-24 x 2-1/2 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:
C
Buy American Compliant:
C
Division:
Electrical H1
Fastener Head Height:
4-Jan in.
Fastener Head Type:
Hex
Fastener Head Width:
0.551 - 0.562 in.
Fastener Height:
0.226 - 0.243
Fastener Length:
2/1/02
Fastener Width:
0.620 - 0.650
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:
CT
Outside Diameter:
0.3690 - 0.3750 IN
Pack Type:
Jar
Product Group:
Fasteners
Product Height:
7.25 in
Product Length:
4.5 in
Product Weight:
4082 g
Product Width:
114.3 MM
Sub Division:
Electrical-E H2
Tensile Strength:
150000 psi minimum
Thread Per Inch:
24
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 JG8HC251 – Frequently Asked Questions

1) Is the Metallics JG8HC251 bolt a fine thread or coarse thread 3/8 bolt?
Fine thread. The JG8HC251 is a 3/8-24 hex cap screw, 24 threads per inch, so it will only mate with 3/8-24 fine nuts and tapped holes. If the hole you are threading into is 3/8-16 coarse, this bolt will not start. Shank diameter runs 0.3690 to 0.3750 inch.
2) Is a Grade 8 bolt stronger than a Grade 5, and when do I actually need it?
Yes, and the numbers show the gap. This Grade 8 hex cap screw is rated 150,000 psi minimum tensile and 130,000 psi minimum yield, hardness Rockwell C33-39. Grade 5 tops out around 120,000 psi tensile. Use Grade 8 where the joint sees high clamp load or repeated shock, which is why these are specified in automotive and fleet work. For general equipment mounting and light structural attachment, a Grade 5 is usually sufficient and easier to source.
3) What socket or wrench size do I need for these Grade 8 hex bolts?
A 9/16 inch wrench or socket. The hex head measures 0.551 to 0.562 inch across the flats, which is the 9/16 standard size for a 3/8 hex cap screw.
4) Will zinc plated Grade 8 bolts hold up outdoors or in a wash bay?
The JG8HC251 is medium carbon steel with a zinc plated finish, which handles indoor service and intermittent weather exposure. Zinc is a sacrificial coating, not a stainless substitute, so in constant salt spray, standing water, or daily wash-down it will eventually rust through. For those conditions step up to a hot dip galvanized or stainless fastener. Note that stainless will not give you Grade 8 strength.
5) How are these sold, and what is the minimum I can buy?
They ship in a jar of 100 pieces, and 100 count is the order minimum. The full jar weighs 4082 g. If you need a different length or a different count, Metallics offers other sizes and quantities in the G8HC and JG8HC series by request.
6) Do these bolts meet Buy American requirements for a government or institutional job?
Metallics lists the JG8HC251 as both ARRA compliant and Buy American compliant. Country of origin is recorded as multiple, so if your contract requires a specific mill origin on the paperwork, ask for the certification on the lot you receive.
7) Do I need Grade 8 nuts and hardened washers with these bolts?
Yes, match the grade. A Grade 8 bolt pulled to its rated 150,000 psi tensile will strip a lower grade nut or dish a plain washer long before the bolt gives up. Pair the JG8HC251 with a Grade 8 (or Grade C) 3/8-24 fine thread nut and hardened washers. Nuts and washers are separate items, nothing beyond the bolts is in the jar.
8) What steel are Metallics Grade 8 hex cap screws made from?
AISI 1021 through 1045 medium carbon steel, quenched and tempered to Rockwell C33-39. That heat treatment is what gets the bolt to Grade 8 strength, and it is also why you should not weld on or re-heat one of these: heat ruins the temper and drops the bolt below its rated strength.
How fast can I get the Metallics JG8HC251 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 JG8HC251 come with a warranty?
Absolutely. The Metallics JG8HC251 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 JG8HC251?
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
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