THREADED 1-8 BACKPLATE/ADAPTER FOR 5" LATHE CHUCKS (3900-3308)

Threaded 1-8 Backplate/Adapter for 5" Lathe Chucks No bolt holes. Machining is required before mounting your chuck to ensure concentricity. For 3 & 4-jaw chucks. A is 125mm. B is 1"-8. D is 25.4mm smooth bore. E is 5mm. F is 56mm. G is 10mm. g is 4mm. G + h is 26mm. g + H is 30mm. K is 100mm. Shipping Weight: 3.9 lbs