Metallics JBLW58 Washers 5/8-11 Split Lock Sbr (Jar 100)

The JBLW58 is a 5/8 inch split lock washer, sized for 5/8-11 threaded bolts, studs and rod. Use it under the nut so the split ring bites in and resists loosening from vibration.

Silicon bronze, not plated steel. That matters on marine, wastewater, and damp exterior work where a zinc plated washer rusts and seizes the nut. It also keeps the fastener stack consistent when you are already using bronze or brass hardware, so you are not mixing dissimilar metals at the joint.

100 washers per jar, sold as a jar rather than loose count. Jar weight is 2.86 lbs, so it is easy to keep on the truck or in a gang box for repeat 5/8 anchor and strut work.

They do different jobs. A split lock washer like the JBLW58 is a tension device: it springs against the nut to keep the joint from backing off under vibration. A flat washer spreads load over the surface and protects softer material. On 5/8 rod and strut hangers with vibration, such as equipment support or conduit racks, many installers run a flat washer against the surface and the split lock between it and the nut.

Mechanically it fits any 5/8-11 bolt, but the JBLW58 is silicon bronze, so pairing it with galvanized steel in a wet or coastal location sets up dissimilar metal contact. On outdoor or submerged work, keep the whole stack in one family: bronze washer with bronze or brass fasteners. Indoors and dry, mixing is far less of a concern.

No. Metallics lists it for the electrical, plumbing, heating and air conditioning trades, so it works anywhere a 5/8 bolted connection needs vibration resistance, including strut and hanger assemblies, mechanical equipment mounting, and pipe support.