Heater Catalog - Watlow

Tubular HeatersWATROD Single/Double-Ended HeatersMounting Methods (Continued)WATROD SECTThreaded BulkheadsA threaded bushing with flange on the heater sheathprovides rigid, leak-proof mounting through the walls oftanks. A gasket, plated steel washer and hex nut areincluded. The threaded end of the bushing is flush withthe sheath’s end unless otherwise specified. Threadedbulkheads are available in brass, steel or stainless steelas indicated in the table.To order, specify threaded bulkheads and thespecifications from the table.ACGasketWallWasherNutBD bThreaded Bulkhead SpecificationsA a B CElement Flange Threaded OverallDiameter Thread Size/Style Length Lengthin. (mm) Material Size in. (mm) in. (mm) in. (mm)Gasket0.260 (6.6) Brass 1 /2 - 20 UNF 3 /4 Round (19.0) 5 /8 (15.9) Wall/4 (19.0)0.260 (6.6) SS 1 /2 - 20 UNF 3 /4 Round (19.0) 5 /8 (15.9) 3 /4 Washer (19.0)CNut0.315 (8.0) Brass 1 /2 - 20 UNF 3 /4 Round (19.0) 5 /8 (15.9) 3 /4 (19.0)0.315 (8.0) Steel 1 /2 - 20 UNF 3 /4 Hex (19.0) 3 /4 (19.0) 15 /16 (23.8)0.315 (8.0) SS 1 /2 - 20 UNF 3 /4 Round (19.0) 3 /4 (19.0) 27 /32 (21.4)0.375 (9.5) Brass 1 /2 - 20 UNF 3 /4 Round (19.0) 5 /8 (15.9) 3 /4 (19.0)0.375 (9.5) Steel 1 /2 - 20 UNF 3 /4 Hex (19.0) 3 /4 (19.0) 15 /16 (23.8)0.375 (9.5) SS 1 /2 - 20 UNF 3 /4 Round (19.0) 3 /4 (19.0) 27 /32 (21.4)0.430 (10.9) Brass 5 /8 - 18 UNF 7 /8 HexA(22.2) 3 B/4 (19.0) 15 /16 (23.8)0.430 (10.9) Steel 5 /8 - 18 UNF 7 /8 Round (22.2) 3 /4 (19.0) 15 /16 (23.8)0.430 (10.9) SS 5 /8 - 18 UNF 1 Round (25.0) 3 /4 (19.0) 15 /16 (23.8)0.475 (12.1) Brass 5 /8 - 18 UNF 7 /8 Round (22.2) 3 /4 (19.0) 15 /16 (23.8)0.475 (12.1) Steel 5 /8 - 18 UNF 1 Round (25.0) 1 (25.0) 1 1 /8 (28.6)0.475 (12.1) SS 5 /8 - 18 UNF 1 Round (25.0) 3 /4 (19.0) 15 /16 (23.8)a Designates the dimension across flats for hex flange style and outside diameter for round flange style.b Equal to “B” dimension unless otherwise specified.9/16"(14 mm)1 1 /4"(32 mm)2 1 /4"(57mm)15/16" (24 mm)3 /4"(18 mm)Wall0.235"(6 mm)3/16" - 16UNF - 2A78 WATLOW ®