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Washers M12 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 Material:
- Steel Zinc
Metallics JMSW0121 – Frequently Asked Questions
1) What size bolt does the Metallics JMSW0121 flat washer fit?
It's an M12 metric flat washer, so it goes with M12 bolts, screws and threaded rod. It will not suit imperial 1/2 inch fasteners properly, since M12 is a metric 12mm diameter and 1/2 inch measures 12.7mm. For 1/2 inch hardware, order a 1/2 inch flat washer instead.
2) Are these M12 flat washers steel or stainless?
Zinc plated steel, not stainless. The zinc gives basic corrosion resistance for dry interior electrical work, panel mounting, strut and hanger assemblies. For wet, exterior or corrosive locations, specify a stainless or hot dip galvanized washer instead.
3) How many M12 washers come in the Metallics JMSW0121 jar?
100 pieces per jar. The jar pack keeps them together on the truck and in the gang box rather than loose in a bag, which is why electricians buying for panel and strut work tend to order these by the jar.
4) What part number do I order for Metallics M12 zinc plated flat washers?
Metallics part number JMSW0121 covers the M12 flat zinc plated steel washer in the 100 piece jar. That is the manufacturer number to quote; there are no size or finish variations under it.
5) Do I need a flat washer and a lock washer on an M12 bolt, or just one?
They do different jobs. A flat washer like the JMSW0121 spreads the clamp load and protects the surface under the nut or bolt head, which matters on sheet metal enclosures and soft or slotted material. It does nothing to stop loosening. If vibration is a concern, use the flat washer against the material and add a lock washer or a locking nut on top of it.
6) Is the Metallics JMSW0121 washer dimensionally standard or a proprietary size?
It is built to ANSI dimensional standards, so a standard M12 washer from another maker will interchange on the same fastener. Useful if you are topping up a jar mid-job rather than standardizing a whole facility on one brand.
How fast can I get the Metallics JMSW0121 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
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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 JMSW0121 come with a warranty?
Absolutely. The Metallics JMSW0121 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 JMSW0121?
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selection,
installation tips, and troubleshooting. Contact Us
Why buy the Metallics JMSW0121 from ZenSupply?
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