Metallics JBLW78 Washers 7/8" Split Lock Sbr (Jar 100)

The JBLW78 is a 7/8 inch split lock washer, so it goes under the nut on 7/8 inch diameter bolts or threaded rod. Split lock washers are sized by the bolt diameter they ride on, not by outside diameter, so a 7/8 inch washer pairs with 7/8 inch hardware only.

Silicon bronze. That is the reason to pick the JBLW78 over a plated steel lock washer: bronze resists corrosion in wet, marine, and outdoor service, and it keeps you from mixing dissimilar metals when the bolt, nut, and hardware are also bronze.

Match the washer to the fastener metal wherever you can. The JBLW78 is silicon bronze, meant to be run with bronze bolts and nuts; putting bronze against galvanized or plain steel in a damp location sets up a dissimilar-metal couple that corrodes the less noble part. If your bolts are steel, use a steel lock washer of the same 7/8 inch size instead.

100 washers per jar, and the jar is the pack form it ships in. Jar count is 100 pieces, so one jar covers a hundred 7/8 inch bolted connections at one washer each.

They do two different jobs. A split lock washer like the JBLW78 bites into the nut and the mating surface to resist the nut backing off under vibration. A flat washer spreads load and protects the surface. On an electrical connection that sees vibration or thermal cycling, many installers use both: flat washer against the material, split lock washer under the nut. The JBLW78 only provides the locking function.

Order by MPN JBLW78 from Metallics. That number covers the 7/8 inch silicon bronze split lock washer supplied 100 to a jar; there is a single configuration, so no finish or pack option to specify.

A full jar runs 5.62 lbs, with the container measuring 7.25 x 4.5 x 4.5 inches. Useful if you are loading a service truck bin or working out shelf space in an MRO crib.

It is stocked as electrical fastener hardware, and silicon bronze is a common choice on grounding and bonding hardware and in wet or corrosive electrical installations. Mechanically it is a standard 7/8 inch split lock washer, so it works anywhere a bronze 7/8 inch lock washer is specified.