Industrial BL500 Bushings Knockout Seals Locknuts

Appleton BL500 Bushings/Knockout Seals/Locknuts are a 5-inch, steel, threaded conduit fitting assembly that bundles a bushing, knockout seal, and locknut to suit IMC or rigid conduit applications. Designed to terminate conduit to a knockout or enclosure, this three-component set provides a secure bearing surface and a sealing interface at the enclosure entry. It fits 5-inch trade-size boxes and is intended for use with threaded rigid conduit and IMC, matching standard conduit fittings for a consistent field installation. In Appleton’s conduit fittings family, bushings are used with a locknut to terminate conduit to a box or enclosure, ensuring a clean, code-compliant entry point. Note that catalog references show the BL500 as discontinued, so availability may be limited and customers should consider current replacement options within Appleton’s NEER/Conduit Fittings line or consult a distributor for suitable alternatives.