Metallics JMLWC010 Washers M10 Split Lock Curved St-zn (Jar 100)

The JMLWC010 is an M10 curved split lock washer, so it goes with M10 metric bolts and screws. It will not suit imported inch-series hardware like 3/8-16 fasteners, since M10 and 3/8 inch are different diameters. For strut, panel, and equipment mounting with M10 metric bolting, this is the matching washer.

Material is zinc plated steel. That handles dry interior electrical work, panel and enclosure bolting, and general indoor MRO fastening. For wet, exterior, or corrosive locations you want stainless or hot dip galvanized instead, since zinc plating is a light coating.

Each jar holds 100 pieces. The jar pack is the standard counter and van-stock format, which is what makes it practical for an electrician restocking a service truck or an MRO crib keeping M10 lock washers on the shelf rather than counting loose pieces out of a bin.

A curved (helical) split lock washer like the JMLWC010 is sprung along its arc, so it flexes under the bolt head and keeps tension on the joint as the assembly vibrates or cycles with temperature. A plain flat washer only spreads load and does nothing to resist loosening. If you need load spreading over soft material or an oversized hole as well as anti-loosening, use a flat washer under the lock washer.

Yes, that is the intended use. These are catalogued with electrical supply fasteners and are the standard anti-vibration washer for M10 bolting on enclosures, equipment frames, and metric channel hardware. Confirm your bolts are metric M10 and not inch-series before ordering.

Country of origin is listed as multiple, meaning the jars are sourced from more than one manufacturing country depending on production run. Dimensionally they are the same M10 curved split lock washer regardless of the run, so mixed-origin jars will not cause fit problems on a job.