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)