Metallics JG8HC371 Bolts 1/2-2...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$57.11
$9.64
Metallics JG8HC371 Bolts 1/2-20 x 4 G8 HXBT St-zn (Jar 25)

Metallics JG8HC371 Bolts 1/2-20 x 4 G8 HXBT St-zn (Jar 25)

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Model: JG8HC371
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$57.11
$9.64
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Bolts 1/2-20 x 4 G8 HXBT St-zn (Jar 25)

  • Additional Notes

    • Other sizes and quantities available by request

  • 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

Manufacturer Resources

Product Specs

Arra Compliant:
C
Buy American Compliant:
C
Division:
Electrical H1
Fastener Head Height:
Nov-64 in.
Fastener Head Type:
Hex
Fastener Head Width:
0.428 - 0.438 in.
Fastener Height:
0.150 - 0.163
Fastener Length:
4
Fastener Width:
0.484 - 0.505
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:
25
Order Minimum Uom Imperial:
EA
Outside Diameter:
0.2450 - 0.2500 IN
Pack Type:
Jar
Product Group:
Fasteners
Product Height:
7.25 in
Product Length:
4.5 in
Product Weight:
2853 g
Product Width:
114.3 MM
Sub Division:
Electrical-E H2
Tensile Strength:
150000 psi minimum
Thread Per Inch:
20
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 JG8HC371 – Frequently Asked Questions

1) Is the Metallics JG8HC371 bolt a fine thread or coarse thread 1/2 inch bolt?
Fine thread. The JG8HC371 is a 1/2-20 hex bolt, 20 threads per inch, which is the UNF fine pitch rather than the 1/2-13 coarse pitch. It will only mate with 1/2-20 nuts and tapped holes, so don't mix it into an assembly built around coarse thread hardware.
2) How strong is a Grade 8 hex bolt compared to a Grade 5?
The JG8HC371 is a Grade 8 cap screw with 150,000 psi minimum tensile and 130,000 psi minimum yield, hardness Rockwell C33-39. Grade 5 tops out at 120,000 psi tensile, so Grade 8 is the step up when the joint load or clamp force exceeds what a Grade 5 will carry. It's medium carbon steel, heat treated, which is why it is common in automotive and fleet work.
3) How many bolts come in a jar of Metallics JG8HC371?
25 pieces per jar, and 25 each is the order minimum. Other sizes and quantities are available by request.
4) Will a 4 inch long 1/2-20 Grade 8 bolt be long enough for my grip?
The JG8HC371 has a 4 inch nominal length under the head. On a fine thread bolt this length the threads do not run the full shank, so size your total grip (stacked material plus washers plus nut) against that 4 inches and keep at least a couple of threads protruding past the nut.
5) Is the zinc plating on this Grade 8 bolt good enough for outdoor use?
The JG8HC371 is steel with a zinc finish. Zinc plating handles indoor, sheltered, and general equipment service well, but it is a sacrificial coating, not stainless, so in constant wet, coastal, or chemical exposure it will eventually surface rust. For permanently exposed structural work, a hot dip galvanized or stainless fastener is the better pick.
6) Does this Metallics bolt meet Buy American and ARRA requirements for a public project?
The JG8HC371 is flagged compliant for both Buy American and ARRA, with country of origin listed as multiple. Procurement officers writing a domestic preference clause should file the compliance flags with their submittal package.
7) What is the hex head size on the Metallics 1/2-20 Grade 8 bolt, and will a standard wrench fit?
Head geometry is published as 0.428 - 0.438 in. head width with head height 0.150 - 0.163 in. and shank width 0.484 - 0.505 in. Check those figures against your socket before committing to a tool size on a torque-critical joint.
8) What steel is used in the Metallics G8HC series Grade 8 hex bolts?
Material standard is AISI 1021 - 1045, a medium carbon steel, quench and temper heat treated to reach the Grade 8 hardness band of Rockwell C33-39. That is the same base material family across the G8HC and JG8HC series.
9) How much does a jar of 25 Metallics JG8HC371 bolts weigh for shipping?
Published weight is 2853 g for the jar of 25. Useful if you are batching fastener jars onto a pallet or a service truck with a load limit.
How fast can I get the Metallics JG8HC371 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 JG8HC371 come with a warranty?
Absolutely. The Metallics JG8HC371 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 JG8HC371?
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 JG8HC371 from ZenSupply?
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