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Washers 5/16" Flat SAE Gr8 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:
- 2.15 in
- Product Material:
- Steel
- Product Weight:
- 0.55 lbs
- Product Width:
- 3 in
Metallics JG8SW74 – Frequently Asked Questions
1) What bolt size do the Metallics JG8SW74 flat washers fit?
The JG8SW74 is a 5/16 inch SAE flat washer, so it pairs with 5/16 inch bolts and screws. SAE pattern means a smaller outside diameter and tighter hole than a USS washer of the same nominal size, which is what you want under a 5/16 bolt head or nut on machined or sheet steel rather than spanning an oversized hole.
2) Are these Grade 8 washers hard enough for high strength bolted connections?
Yes. The JG8SW74 is a Grade 8 hardened steel washer, which is the grade you use under Grade 8 bolts and nuts so the high clamp load does not dig into or deform the washer. A standard low carbon flat washer under a Grade 8 bolt will crush; this one will not.
3) Will these washers hold up outdoors or in a damp mechanical room?
These are steel washers with a zinc plating, which gives moderate corrosion resistance for indoor, covered, and general service use. Zinc plate is not a marine or continuously wet duty coating, so for exposed exterior or washdown areas step up to hot dip galvanized or stainless.
4) Do these meet ANSI dimensional standards for flat washers?
The JG8SW74 is built to the ANSI dimensional standard for SAE pattern flat washers, so the inside diameter, outside diameter, and thickness match what a drawing calling out an ANSI 5/16 SAE washer expects. Useful if you are matching a submittal or standardizing a stock room.
5) Should I use an SAE flat washer or a USS flat washer for 5/16 hardware?
Pick SAE, like the JG8SW74, when the washer sits on a normal clearance hole and you need the bearing surface under the bolt head without crowding adjacent hardware. Pick USS when the hole is oversized or slotted, or the material is soft and you want the larger outside diameter to spread load further. Both are nominally 5/16; only the outside diameter and thickness differ.
6) What part number do I order for 5/16 Grade 8 zinc flat washers from Metallics?
Order Metallics part number JG8SW74. That is the 5/16 inch flat SAE Grade 8 zinc plated steel washer, supplied 100 to a jar. One part number, no finish or pack options to specify.
7) Where is the Metallics JG8SW74 washer made?
Country of origin is China. Worth confirming against your contract if you are buying for a government or federally funded project with domestic sourcing requirements.
How fast can I get the Metallics JG8SW74 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 JG8SW74 come with a warranty?
Absolutely. The Metallics JG8SW74 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 JG8SW74?
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 JG8SW74 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support,
and
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