Metallics JMLW08SS Washers M8 Split Lock SS (Jar 100)

It is an M8 split lock washer, so it goes over an 8mm metric bolt or screw shank. M8 is a metric thread size, not an inch size, so it will not seat correctly on a 5/16 inch bolt even though the two are close in diameter. If your hardware is inch-series, you want a 5/16 inch lock washer instead.

Stainless steel throughout, not a zinc or chrome plating over carbon steel. That matters for outdoor enclosures, wet locations, and any run where you are pairing stainless bolts and nuts - mixing a plated washer into a stainless assembly gives you the galvanic couple you were trying to avoid.

One hundred washers per jar. They ship in a jar rather than a bag or box, which is why they hold up in a van or on a cart better than a poly bag - the whole container weighs 0.4 lbs and measures 3 x 3 x 2.15 inches, so it drops into a bin or a tool box tray.

A split lock washer is a single coil with a gap, and the sprung ends bite into the nut face and the mounting surface to resist loosening under vibration. A flat washer does a different job: it spreads load and protects the surface. They are not interchangeable. On a vibrating assembly, use the split lock washer under the nut, and add a flat washer beneath it if the material is soft or the hole is oversized.

Yes, that is what they are stocked for - Metallics catalogs the JMLW08SS as an electrical fastener, and M8 is the common metric size on imported enclosures, panel hardware, and metric strut fittings. Stainless makes them usable outdoors and in damp locations as well as inside a dry panel.

Metallics part number JMLW08SS. The JMLW prefix is the jar-packed metric lock washer line, 08 is the M8 size, and SS marks the stainless version - so if you need a different metric diameter in the same stainless jar pack, the size digits are what change.

Country of origin is China. If you are bidding a job with domestic-sourcing requirements, that is the detail to check against your spec before you commit the quantity.