Markal 86400 Temperature Indicator Stick 100°F welding

Markal 86400 Temperature Indicator Stick

The Markal 86400 is a temperature-indicating stick calibrated to melt at 100 degrees Fahrenheit. It provides a visual signal when a workpiece reaches the target temperature during welding or heat-treating tasks. The stick includes a protective holder, adjustment ring and shirt clip for convenient access on the job. Accuracy is rated at plus or minus one percent Fahrenheit and plus or minus three percent Celsius.

Upgrading from guesswork or basic crayons

This stick replaces unreliable visual estimates or uncalibrated markers when precise interpass or pre-heat verification is required. The jump is worth it when code compliance demands NIST-traceable proof that a specific temperature has been reached. It supports processes such as annealing, stress-relieving and post-weld heat treating where documented temperature control is mandatory.

Limits of the ANSI/ASME B 32.1 and B 31.3 standard

The indicator is qualified to ANSI/ASME Code B 32.1 and B 31.3 as well as ASME Code Sections I, III and VII and AWS D 1.1. Its calibration applies specifically to iron and steel substrates. Users must verify that the base material and code requirements match these listed standards before relying on the stick for acceptance criteria.