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General Purpose Thermocouples

Melt Bolt Thermocouple (Type 4M)

These robust thermocouples have been designed to withstand the high pressures found within the nozzles of plastics extruders and injection moulding machines where they are used in order to measure the temperature of the molten medium. Available as standard in either 76mm or 152mm bolt lengths with either a 5mm long or flush sensing tip length. Available in thermocouple types K, T, J, N and they have an insulated junction and are terminated in a standard round pin thermocouple plug. Suitable for use up to 600ºC (at tip) with a bolt thread size of 1/2 inch UNF20, 316 stainless steel.

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1. Thermocouple Type

2. Bolt Length

3. Tip Length

4. Quantity Required

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1 Thermocouple Type Temperature Range (continuous) Temperature Range
(short term)
K Nickel Chromium vs
Nickel Aluminium
0°C to +1100°C -180°C to +1350°C
T Copper vs Constantan -185°C to +300°C -250°C to +400°C
J Iron vs Constantan +20°C to +700°C -180°C to +750°C
N Nicrosil vs Nisil 0°C to +1100°C -270°C to +1300°C
Temperature ranges refer to the thermocouple type.
The temperature range of the sensor may deviate from the above,
please refer to the product description for more details