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What are combination square sets
made of?

Shop for Protractor Sets

A black Starrett combination square set; square head, centre head, protractor head, rule, ruler, blade Combination square sets can be made from a number of different materials.
A black Starrett protractor head; combination square set The heads may be made from a different material than the rule.

Rule materials

A representation of the fact that combination square set can have aluminium rules; square head, centre head, protractor head, ruler, blade

Aluminium

  • Aluminium is rather light
  • Aluminium, once oxidised, will not corrode further
A representation of the fact that combination square sets can have carbon steel rules; square head, centre head, protractor head, rule, ruler, blade

Carbon steel

  • Carbon steels with a high enough carbon content can be quite strong. Some combination squares are made using a medium carbon steel
A representation of the fact that combination square sets can have stainless steel rules; square head, centre head, protractor head, rule, ruler, blade

Stainless steel

  • Stainless steel is resistant to the effects of rust/corrosion

Head materials

A representation of the fact that combination square sets can have aluminium heads; rule, ruler, blade

Aluminium

  • Aluminium is rather light
  • Aluminium, once oxidised, will not corrode further
A representation of the fact that combination square sets can have cast iron heads; combination square set

Cast iron

  • Cast iron is strong (although it does suffer from being brittle)
  • Cast iron does suffer from rust, butcan be given protection through a coating such as paint
A representation of the fact that combination square sets can have zinc alloy heads; square head, centre head, protractor head, rule, ruler, blade

Zinc alloy

  • Zinc is cheaper than aluminium
  • Zinc may be used when corrosion is undesirable
Combination square with plastic square head; rule, ruler, blade Very occasionally you may find a combination square with a plastic square head.
A Faithfull square head with a brass locking nut; combination square set In addition, locking nuts may be made from brass.
A combination square set, satin chrome finish, square head, centre head, protractor head, rule, ruler, blade Sometimes, a “satin chrome finish” may be used, especially on the rules; this reduces the effects of glare, which may become a problem when working underneath bright lights. The user may then be able to see readings more clearly. Other finishes may be seen as well.