Hubbell-Raco 1002 Conduit Locknut Brand: Hubbell-Raco. Part Number: 1002. RACO Conduit Locknut, 1/2 in, For Use With: IMC/Rigid Conduit, Steel, Silver, Electro-Plated Zinc, 1.13 in W x 0.125 in THK. Additional Description: RACO-1002 LOCKNUT 1/2 IN STEEL. Catalog Description: Locknuts Steel, 1/2 In. Trade Size..