Body: Tempered steel 0.35 - 0.45% C
||Semi-finished T-slot nuts can be drilled
and tapped economically with non-standard threads.
To heat treat to property class 10.9 i.e. HRC 21 -
28, heat material to 880 degrees C for 45 minutes, quench in
oil at 75 degrees C and temper at 550 degrees C for 2