Ex Industries stock a wide range of adaptors and reducers.  Adapters and reducers from Redapt Engineering are dual certified EExd & EExe.  We also have a complete stock of stopping plugs, sealing washers, locknuts, lock washers and earth tags.  Check the chart below to identify your thread conversion needs. ADAPTORS & REDUCERS FEMALE SIZES MALE SIZE M16 M20 M25 M32 M40 M50 M63 M75 NPT/BSP ISOMETRIC ½" ¾" 1" 1¼" 1½" 2" 2½" 3" M16 A A             A               M20 R A A           A A             M25 R R A A         R A A           M32 R R R A A       R R A A         M40 R R R R A A     R R R A A       M50 R R R R R A A   R R R R A A     M63 R R R R R R A A R R R R R A A   M75 R R R R R R R A R R R R R R A A NPT/BSP   ½" R A A           A A             ¾" R R A A         R A A           1" R R R A A       R R A A         1¼" R R R R A A     R R R A A       1½" R R R R R A A   R R R R A A     2" R R R R R R A A R R R R R A A   2½" R R R R R R R A R R R R R R A A 3" R R R R R R R R R R R R R R R A PG   7 & 9 A A             A               11 & 13.5 R A A           A A             PG16 R A A           A A             PG21 R R A A         R A A           PG29 R R R A A       R R A A A       PG36 R R R R R A     R R R A A       PG42 R R R R R A A   R R R R A A     PG48 R R R R R R A A R R R R R A A   R = REDUCER A = ADAPTOR Materials: Brass; Aluminum; 316 Stainless Steel; Mild Steel; 30% Glass Filled Nylon Plating: Nickel; Zinc; Cadmium; Others On Application