Watlow Heater Catalog

Tubular Heaters

WATROD Single/Double-Ended Heaters Mounting Methods (Continued) Threaded Bulkheads A threaded bushing with flange on the heater sheath provides rigid, leak-proof mounting through the walls of tanks. A gasket, plated steel washer and hex nut are included. The threaded end of the bushing is flush with the sheath’s end unless otherwise specified. Threaded bulkheads are available in brass, steel or stainless steel as indicated in the table. To order, specify threaded bulkheads and the specifications from the table.

WATROD SECT

Gasket

Wall

Washer

Nut

C

A

B

D b

Threaded Bulkhead Specifications

A a

B

C

Element Diameter

Flange

Threaded

Overall Length

Thread

Size/Style

Length

in.

(mm)

Material

Size

in.

(mm)

in.

(mm)

in.

(19.0) (19.0) (19.0) (19.0) Nut (mm)

Gasket

1 / 2 - 20 UNF 1 / 2 - 20 UNF 1 / 2 - 20 UNF 1 / 2 - 20 UNF 1 / 2 - 20 UNF 1 / 2 - 20 UNF 1 / 2 - 20 UNF 1 / 2 - 20 UNF 1 / 2 - 20 UNF 5 / 8 - 18 UNF 5 / 8 - 18 UNF 5 / 8 - 18 UNF 5 / 8 - 18 UNF 5 / 8 - 18 UNF 5 / 8 - 18 UNF

3 / 4 Round (19.0)

5 / 8 5 / 8 5 / 8 5 / 8 3 / 4 3 / 4 5 / 8 3 / 4 3 / 4 3 / 4 3 / 4 3 / 4 3 / 4 C

3 / 4 3 / 4 3 / 4 3 / 4 Wall

0.260 0.260 0.260 0.315 0.315 0.315 0.375 0.375 0.375 0.430 0.430 0.430 0.475 0.475 0.475

(6.6) (6.6) (6.6) (8.0) (8.0) (8.0) (9.5) (9.5) (9.5)

Brass

(15.9) (15.9) (15.9) (15.9) (19.0) (19.0) (15.9) (19.0) (19.0) (19.0) (19.0) (19.0) (19.0) (25.0) (19.0)

3 / 4 Hex

Washer

Steel 3

(19.0)

9 / 16 " (14 mm)

3 / 4 Round (19.0) 3 / 4 Round (19.0)

SS

Brass Steel

3 / 4 Hex

15 / 16 (23.8) 27 / 32 (21.4)

(19.0)

3 / 4 Round (19.0) 3 / 4 Round (19.0)

SS

3 / 4

Brass Steel

(19.0)

3 / 4 Hex

15 / 16 (23.8) 27 / 32 (21.4) 15 / 16 (23.8) 15 / 16 (23.8) 15 / 16 (23.8) 15 / 16 (23.8) 1 1 / 8 (28.6) 15 / 16 (23.8)

(19.0)

A

B

3 / 4 Round (19.0)

SS

7 / 8 Hex

(10.9) (10.9) (10.9) (12.1) (12.1) (12.1)

Brass Steel

(22.2)

7 / 8 Round (22.2)

SS

1 Round

(25.0)

7 / 8 Round (22.2)

Brass Steel

1 Round 1 Round

(25.0) (25.0)

1

3 / 4

SS

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. 3 Extended capability only.

Wall

1 1 / 4 " (32 mm)

15 / 16 " (24 mm)

3 / 4 " (18 mm)

2 1 / 4 " (57mm)

0.235" (6 mm)

3 / 16 " - 16 UNF - 2A

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