Metallics JMLWHC008 Washers M8 Split Lock Hi-Col St-zn (Jar 100)

High collar means a thicker section with a smaller outside diameter than a regular split lock washer. That narrower footprint is what lets it sit inside a counterbored hole or under a socket head cap screw head without overhanging, and the extra thickness gives more spring. If your bolt head has a broad bearing face and there is room around it, a regular-series split lock washer is the usual choice.

Either, as long as it sits directly against the bearing face of the part you are turning. A split lock washer works by digging its sprung ends into the nut or bolt head and the joint surface as it is torqued down, so it needs to be the last washer in the stack, not separated from the fastener by a flat washer on the turning side.

The material is zinc plated steel, which gives moderate corrosion resistance. That holds up fine indoors, in panels, and in dry raceway work. For continuous wet locations, washdown areas, or coastal exposure, stainless hardware is the better call since zinc plating wears and sacrifices over time.

100 washers per jar. The jar measures 3 x 2.15 x 3 inches and the whole pack weighs 0.27 lbs, so it is a bin-size container for a van shelf or a shop drawer rather than a bulk box.

A split lock washer is a general anti-loosening washer and does not bite through paint or coatings. For bonding and grounding where you need to cut through a painted enclosure surface to make metal-to-metal contact, an external tooth or serrated-face washer is the right part. Use the M8 split lock for mechanical fastening of strut, brackets, and equipment mounting instead.

Country of origin is listed as multiple, so the jars are sourced from more than one manufacturing country. If your project requires a single documented country of origin or domestic sourcing, specify that at the time you order.