Combination Squares

A combination square is a versatile adjustable measuring tool that quickly and accurately measures objects for precise work. A combination square is an essential tool for any toolbox, more used for meticulous work than production work. This hand tool comes in various sizes ranging from small ones you can keep in your pocket to larger heavy-duty ones that come with all the attachments for bigger jobs.


The construction of a Combination Square


  • Square head (also known as a mitre head or an anvil) – has a slot which the rule fits through which is locked in place by a screw. Made from die-cast alloy, aluminium, cast iron (strong and resistant to oils and chemicals). More expensive ones are made of forged and hardened steel.
  • Rule or blade - manufactured from steel or hardened and tempered steel, accurate markings (metric and imperial) etched into the steel rules, thicker steel blades are better.
  • Level bubble vial – acts as a spirit level.
  • Protractor head – used to set and mark angles.

  • Centre Finder – easily indicates the centre of a round object.
  • Scriber to mark lines – usually inserted in the end.
  • The heads need changing in order to use the other devices. They are precision instruments which need to be stored carefully as damage to the tool can cause inaccuracies.

What are Combination Squares are used for?


  • Measuring straight lines perpendicular to an edge.
  • Measuring 90 degree and 45-degree angles, drawing lines parallel to the edge, easy to layout a triangular
  • Adjustable depth for repetition marking and scribing
  • Marking a line around a post or bean for cutting
  • Find centre of a round object, for example, dial or rod
  • Measuring the depth of a groove
  • Determining flatness
  • Setting bits and blades, for example, the height of blade
  • Use the rule/blade on its own as a ruler Fine-tune a machine
  • Projector heads - finds any angles you require
  • Some have to spirit levels on the tool ideal for small jobs

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Description Price Rule Length Rule Subdivisions Head Material Rule Material Scribe Height Length Width
RS Stock No. 300-8287
BrandRS PRO
$73.55
Each
units
12 in, 300mm 1 mm, 1/16 in, 1/8 in Steel Steel Yes 25mm 315mm 160mm
RS Stock No. 249-3987
BrandRS PRO
$474.55
Each
units
12in 0.5 mm, 1 mm, 1/32 in, 1/64 in - Steel Yes - - -
RS Stock No. 785-7888
BrandRS PRO
$474.55
1 Set
Set(s)
300mm 0.5 mm, 1 mm Steel Tempered Steel Yes - - -
RS Stock No. 667-2456
Mfr. Part No.CS400
BrandBahco
$44.35
Each
units
16 in, 400mm - - Stainless Steel Yes - - -
RS Stock No. 663-768
Mfr. Part No.DW750
BrandStarrett
$86.93
Each
units
150 mm, 5-3/4in 0.5 mm, 1 mm, 1/32 in, 1/64 in - - - - - -
RS Stock No. 667-2452
Mfr. Part No.CS300
BrandBahco
$39.81
Each
units
12 in, 300mm - - Stainless Steel Yes - - -
RS Stock No. 202-9592
Mfr. Part No.FB33RS
BrandFisher
$86.62
Each
units
12 in, 305mm 1 mm, 1/16 in, 1/32 in Aluminium Steel Yes - - -
RS Stock No. 667-2459
Mfr. Part No.CS150
BrandBahco
$21.65
Each
units
150 mm, 6in - - Stainless Steel Yes - - -
RS Stock No. 202-9570
Mfr. Part No.F411RS
BrandFisher
$14.56
Each
units
152 mm, 6in 1 mm, 1/16 in, 1/32 in Aluminium Anodised Aluminium Yes - - -
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