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Washers 5/16 G8 USS Flat St-zn (Jar 100)
Manufacturer Resources
Product Specs
- Ansi:
- ANSI
- Country Of Origin:
- MUL
- Division:
- Electrical H1
- Field Application:
- Electrical, Plumbing, Heating and Air Conditioning Industries
- Fits Bolt Size:
- 16-May IN
- Inside Diameter:
- 8-Mar IN
- Outside Diameter:
- 8-Jul IN
- Pack Type:
- Jar
- Product Family:
- Electrical Supplies
- Product Group:
- Fasteners
- Sub Division:
- Electrical-E H2
- Washer Type:
- Wrought Washer
- Department:
- Electrical
- Product Subgroup:
- Washers
- Product Finish:
- Zinc Chromate
- Product Length:
- 3 in
- Product Height:
- 2.15 in
- Product Material:
- Hardened Steel
- Product Weight:
- 0.59 lbs
- Product Width:
- 3 in
Metallics JG8WW81 – Frequently Asked Questions
1) What bolt size do the Metallics JG8WW81 flat washers fit?
They're sized for 5/16 inch bolts, in the USS flat washer pattern. USS is the wider, larger-OD series, so it spreads load over a bigger footprint than an SAE washer of the same bolt size and is the usual choice on structural steel, strut, and equipment mounting where the hole is oversized.
2) Are these Grade 8 washers hardened, and can I use them under a Grade 8 bolt?
Yes. The JG8WW81 is a Grade 8 washer made of hardened steel, which is what you want under a Grade 8 bolt or nut. A soft, unhardened washer under a high-strength fastener will dish or embed when you torque it, and you lose clamp load. Hardened steel resists that.
3) Is the Metallics 5/16 USS washer plated for corrosion resistance?
The finish is zinc with a zinc chromate coating over the hardened steel. That's a standard indoor and protected-outdoor plating, fine for panel work, strut runs, mechanical rooms, and general MRO. For direct weather exposure, continuous wet locations, or coastal work, a stainless or hot-dip galvanized washer is the better call.
4) How many washers come in a jar of Metallics JG8WW81?
100 washers per jar. The jar pack is what makes this practical for a service van or a shop bin, you can pour out a handful and reseal it, and the whole jar weighs 0.59 lbs so it isn't taking up a shelf. Handy for electricians and mechanical contractors standardizing on one 5/16 washer across jobs.
5) Are these washers only for electrical work, or can I use them on plumbing and HVAC jobs too?
Metallics lists this washer for the electrical, plumbing, heating and air conditioning trades. It's a general purpose hardened flat washer, so it works anywhere a 5/16 bolt needs load spread: strut and channel hangers, pipe clamps, equipment feet, panel and enclosure mounting.
6) Is this a stamped washer or a forged one?
It's a wrought washer, meaning stamped and then hardened, which is the normal construction for a USS flat washer. Flat on both faces with no cup or split, so it does not act as a lock washer. If you need vibration resistance, pair it with a lock washer or a nylon insert nut.
How fast can I get the Metallics JG8WW81 delivered?
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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 JG8WW81 come with a warranty?
Absolutely. The Metallics JG8WW81 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 JG8WW81?
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