Machinability Index

boring the backplate

The machinability index is relative ease of machining a metal.

American Iron and Steel Institute rated AISI 1212 steel which is equivalent to EN1A in the UK as 100%. This sets a baseline from which you can compare the machinability of different materials.

Free-cutting Brass300%
 Aluminium 6063T190%
AISI 1212 (EN1A)100%
 Naval Brass90%
303 Stainless65%
AISI 1040 (EN8)64%
 Phosphor Bronze60%
Inconel30%
Nimonic 909.1%

Free Machining Steels

A group of steels designated as being easy to machine. Contain one or more additives, which enhance machining characteristics and lower machining cost.

About Nigel 319 Articles
Have been making models since I was around 7 years old and using a lathe from the age of 11, a self taught engineer with a passion for making model engines.

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