What are combination square sets made of?

3rd March 2020

	What are combination square sets made of?


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			Combination square sets can be made from a number of different materials.

			The heads may be made from a different material than the rule.

			Rule materials
			Aluminium Aluminium is rather light Aluminium, once oxidised, will not corrode further

			Carbon steel Carbon steels with a high enough carbon content can be quite strong. Some combination squares are made using a medium carbon steel

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

			Head materials
			Aluminium Aluminium is rather light Aluminium, once oxidised, will not corrode further

			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

			Zinc alloy Zinc is cheaper than aluminium Zinc may be used when corrosion is undesirable

			Very occasionally you may find a combination square with a plastic square head.

			In addition, locking nuts may be made from brass.

			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.