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W A T R O D T U B U L A R H E A T E R S

Moisture Resistance Seals

WATRODs MgO insulating material is hygroscopic. To
prevent moisture contamination from entering the heater, an
appropriate moisture seal must be used. Choosing the correct
seal is important to the life and performance of the heater. Be
sure the maximum continuous use temperatures is not
exceeded at the seal location. Most end seals are applied
with a small cavity in the end of the heater. The seal will also
help prevent arching at the terminal ends.

Applications

• Hot runner molds

Bend Formations

Single-Ended WATROD
Watlow does not recommend field bending single-ended
WATROD elements. The minimum radius of the bend and the
straight length beyond the bend limits formation. The radius
must be 76 mm (3 in.) or more for the heated length’s end to
be inside a bend.

Double-Ended WATROD
Double-ended WATROD heating elements can be formed
into spirals, compounds, multi-axis and multi-planes from 36
common bend configurations. Custom bending with tighter
tolerances can be made to meet specific application needs.

The minimum bend radius and the straight length required
beyond the bend limits formation. In order to locate the end of
a heated length within a bend, the radius must be 76 mm 
(3 in.) or larger. Additionally, overall length tolerances must
be included in one or more of the straight lengths.

WATROD Termination Options

Double-ended WATROD elements are available with a variety of terminations. Single-ended WATROD elements are available with
only flexible lead wires. The following table and illustrations detail the terminations available with double- or single-ended 
WATRODs – for each available sheath diameter.

Standard flexible lead wires are 305 mm (12 in.) unless otherwise specified. Insulation options include TGGT (250°C/480°F) plus other
temperature ratings. Consult factory for availability. Overmolds are available for flexible lead wires only and are available in silicone
rubber (200°C/390°F), neoprene (90°C/212°F) and other materials. Consult your Watlow representative for details.

Double-Ended

6.6

0.260

#6-32

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

8.0

0.315

#10-32

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

8.5

0.335

#10-32

Yes

Yes

Yes

Yes

Yes

Yes

Yes

No

9.5

0.375

#10-32

Yes

Yes

Yes

Yes

Yes

Yes

Yes

No

10.9

0.430

#10-32

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

12.0

0.475

#10-32

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

12.4

0.490

#10-32

Yes

Yes

Yes

Yes

Yes

Yes

Yes

No

15.9

0.625

#10-32

Yes

Yes

Yes

Yes

Yes

Yes

Yes

No

Single-Ended

9.5

0.375

No

No

No

No

No

No

No

Yes

No

10.9

0.430

No

No

No

No

No

No

No

Yes

Yes

12.0

0.475

No

No

No

No

No

No

No

Yes

Yes

12.4

0.490

No

No

No

No

No

No

No

Yes

No

15.9

0.625

No

No

No

No

No

No

No

Yes

Yes

Sheath

Threaded

Screw Lug

Quick Connect

Flexible

Lead Wire

WATROD

Diameter

Studa

(Plate)

(Spade)

Lead Wires

Overmolds

Element

mm

inch

A

B

C

D

E

F

G

H

J

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