Metallics JMSW061 Washers M6 Flat St-zn (Jar 100)

If the existing fasteners are metric M6, these drop right in. A lot of imported enclosures, LED fixtures, and drive panels use M6 screws, while North American strut and box hardware is typically 1/4-20 imperial. Check the thread on one of the bolts you already have: M6 pitch is 1 mm and will not thread into a 1/4-20 nut, so standardizing on the right system matters more than the washer itself.

The material is zinc-plated steel, which gives basic corrosion resistance for dry indoor and protected electrical work, panel and enclosure assembly, strut and fixture mounting. Zinc plating is not a marine or continuously wet duty finish, so for exterior exposure, wash-down areas, or coastal sites, specify stainless washers instead.

100 M6 flat washers per jar. The jar pack is the shop-counter and service-van format, so it's one orderable unit of 100 rather than loose count, which is what an MRO stockroom or electrician's truck stock usually wants for a common metric size.

Yes, JMSW061 is the Metallics manufacturer part number for the M6 zinc-plated steel flat washer in the 100-count jar, and it's the single model offered under that designation. Quote that number straight to a distributor and the size, material, and jar pack all come with it.

A flat washer spreads the clamping load of the nut or screw head over a wider area and protects the surface being fastened. On electrical work that means mounting enclosures and panels, hanging fixtures and strut, and bolting cover plates and ground bars where the sheet metal or channel would otherwise deform under the nut. It does not resist loosening, so if you need vibration resistance, pair it with a lock washer or a locking nut.