Watt-Flex� Split-Sheath Cartridge Heater

All Watt-Flex cartridge heaters are built-to-order to match your heating and size requirements. Available sizes for cartridges are listed below.

Watt-Flex heaters eliminate the need for a tight fit. When selecting the right diameter for the bore in your application, keep in mind that the recommended fit for a Watt-Flex diameter is .007" larger than the nominal diameters shown.

For custom sizes and special heating applications, call and talk to one of our heating specialists at (978) 356-9844.

We have designed and built high-watt heaters for use across a wide variety of industries and process heating applications such as molds and dies, plastics, package sealing, and liquids in automotive, plastics, composites, aerospace, food service, and more.

Table: Watt-Flex Cartridge Heater Dimensions
Available Diameters	Nominal Diameters (1)	Standard Cold Section at Terminal End	Min - Max (2) Lengths
1/4�	0.245�	5/16�	1�- 22�
3/8�	0.370�	3/8�	1 1/2� - 36�
1/2�	0.495�	5/8�	2� - 50"
5/8�	0.620�	5/8�	2 1/2� - 72�
11/16�	0.683�	5/8�	3 1/2� - 64�
3/4�	0.745�	5/8�	3 1/2� - 90�
1"	0.9925"	1�	10� - 60�
8.0 mm	7.875 mm	8.000 mm	38 - 660 mm
10.0 mm	9.875 mm	9.500 mm	38 - 915 mm
12.0 mm	11.875 mm	15.875 mm	50 - 1140 mm
12.5 mm	12.375 mm	15.875 mm	50 - 1140 mm
15.0 mm	14.875 mm	15.875 mm	65 - 1250 mm
16.0 mm	15.875 mm	15.875 mm	65 - 1525 mm
20.0 mm	19.875 mm	15.875 mm	100 - 1825 mm
25.0 mm	24.87 mm	24.5 mm	200- 1525 mm
(1) Tolerances: �.002" ( 1/4" to 3/4"); �.0025 (1"); �.05mm (8mm-20mm)
(2) Tolerances: � 3% with 3/32"minimum; �2% above 20 " (500 mm)