Low Density Cartridge Heater Specifications and Tolerances

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Maximum Temperature: 1200°F (650°C)
Maximum Watt Density: 20-45 W/in² (3.1-7.0 W/cm²) depending on heater size and operating temperature.

Nominal Diameter	3/16	1/4	3/8	1/2	5/8	3/4	7/8	15/16	1	1-1/4
Actual Diameter – in.	0.185	0.247	0.372	0.496	0.621	0.745	0.870	0.933	0.995	1.250
Actual Diameter – (mm)	(4.70)	(6.27)	(9.45)	(12.60)	(15.77)	(18.92)	(22.10)	(23.70)	(25.27)	(31.75)
Diameter Tolerance	±.002 (0.051 mm)					±.003 (0.076 mm)				±.005 (0.127 mm)
Length Tolerance	±1/16 (1.59 mm) up to 6" (152.4 mm) long; ±1/8" (3.18 mm) over 6" long
Camber Tolerance Heaters up to 8" (203 mm) long	.005" (0.127 mm)
Camber Tolerance Heaters over 8" (203 mm) long	0.010" (0.254 mm) per foot of length (0.010 x (length in feet)²)

Nominal Diameter	3/16	1/4	3/8	1/2	5/8	3/4	7/8	15/16	1	1-1/4
Maximum Voltage	240	240	240	240	480*	480*	480*	480*	480*	480*
Maximum Amperage	1.5	3.5	6	8	10	15	15	15	25	30
Maximum Wattage	Consult Tempco
Wattage Tolerance	Plus 5%, Minus 10%
Resistance Tolerance	Plus 10%, Minus 5%