Shop term for tempering, from drawing the temper, common with toolmakers, blacksmiths and heat treaters. People draw a part back to a target hardness or draw a blade to a straw color, and many shops call the tempering oven the draw furnace. Outside heat treating the same word means a forming operation, so context tells which one is meant.
Harden it and draw it back to 58, it's a punch, not a file.
Also heard as
- draw back
- drawing
Related terms
Tempering
Reheating hardened steel below its lower critical temperature to trade some hardness for toughness.
Temper colors
Thin oxide colors, from pale straw to blue, that form on clean steel as it is heated in air.
Glass hard
Fully hardened and untempered, so hard and brittle that a file skates off and a drop could shatter it.
Points
Shop shorthand for Rockwell numbers, as in a part running two points high on hardness.