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Washers 5/8 G5 USS Flat St-zn (Jar 100)
Manufacturer Resources
Product Specs
- Ansi:
- ANSI
- Division:
- Electrical H1
- Pack Type:
- Jar
- Product Group:
- Fasteners
- Sub Division:
- Electrical-E H2
- Department:
- Electrical
- Product Subgroup:
- Washers
- Product Length:
- 3 in
- Product Height:
- 2.7 in
- Product Material:
- Steel
- Product Weight:
- 1.01 lbs
- Product Width:
- 3 in
Metallics JG5WW81 – Frequently Asked Questions
1) What bolt size do the Metallics JG5WW81 flat washers fit?
They are 5/8 inch USS pattern flat washers, so they go with 5/8 inch bolts, anchors, and threaded rod. USS pattern means a larger outside diameter and a wider hole than SAE pattern at the same nominal size, which spreads the load over more surface and tolerates slightly sloppy hole alignment.
2) Are these 5/8 washers grade 5 and will they hold up under a high-torque bolted connection?
Yes, the JG5WW81 is a Grade 5 steel washer, which is the hardened class normally paired with Grade 5 bolts so the washer does not dish or emboss into the joint when you torque it down. Material is steel with a zinc plating.
3) Should I use a USS flat washer or an SAE flat washer on 5/8 inch hardware?
Go USS, like the Metallics JG5WW81, when you want maximum bearing area: strut, channel, unistrut hangers, wood framing, sheet metal, or anywhere the hole is oversized. SAE washers are thicker relative to their diameter and narrower, which suits machined joints and tight counterbored pockets where a wide washer would overhang. Both are 5/8 inch bore class; the difference is footprint, not bolt size.
4) Is zinc plating good enough for outdoor or damp electrical work?
Zinc plated steel is a dry-to-mildly-damp finish. It is fine for indoor electrical rooms, strut runs, panel and transformer mounting, and covered mechanical spaces. For direct weather exposure, roof curbs, coastal sites, or anywhere washdown chemicals are present, specify hot dip galvanized or stainless instead, because the thin electroplate on these will eventually bloom white rust and then red.
5) Do I need a lock washer too, or is this flat washer enough?
A flat washer like the 5/8 USS only distributes load and protects the surface, it does nothing to resist loosening. On vibrating equipment, motor bases, or rooftop units, stack the flat washer against the material and add a split lock washer or a nylon insert nut under the nut. The flat washer alone is right for static structural and strut connections.
6) Is the Metallics JG5WW81 washer made to a dimensional standard, and where is it made?
It is built to the ANSI dimensional standard for USS pattern flat washers, which is what lets you mix it with other ANSI 5/8 USS washers already on a job without a thickness or diameter mismatch. Country of origin is China.
7) Will a jar of 100 of these fit in a standard fastener bin or drawer?
The jar is 3 x 3 x 2.7 inches and about a pound, so it drops into most small parts drawers and van bin cups without repacking. That is the practical reason MRO stockrooms buy the jar over a loose count.
How fast can I get the Metallics JG5WW81 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 JG5WW81 come with a warranty?
Absolutely. The Metallics JG5WW81 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 JG5WW81?
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product
selection,
installation tips, and troubleshooting. Contact Us
Why buy the Metallics JG5WW81 from ZenSupply?
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