STARRETT Combination Squares

Combination squares are multi-purpose measuring and marking tools used for metalworking, woodworking & stonemasonry applications. Starrett ...Read More

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STARRETT 11HC-12-4RA
STARRETT C11H-6-16RB
STARRETT 11H-24-4RC
STARRETT C11HC-12-4RD
STARRETT C11MH-150E
STARRETT C33H-24-16RF
STARRETT 11H-12-16RG
STARRETT C11H-18-4RH
STARRETT C33H-6-4RI
STARRETT C434-12-16RJ
StyleModelNumber of PiecesBlade LengthBlade MaterialFinishGraduation TypeGraduationsHead MaterialHead TypePrice (inc. GST)
A
11HC-12-4R		-------- SGD 333.28
B
C11H-6-16R		-------- SGD 276.95
C
11H-24-4R		-------- SGD 433.45
D
C11HC-12-4R		-------- SGD 337.72
E
C11MH-150		-------- SGD 287.05
E
33JHC-6-4R		-------- SGD 411.49
F
C33H-24-16R		-------- SGD 599.45
E
33JH-6-16R		-------- SGD 285.72
G
11H-12-16R		-------- SGD 317.51
E
C11MEHC-600		-------- SGD 646.48
H
C11H-18-4R		218"Tempered SteelBlack Wrinkle4R8ths/16ths/Quick Reading 32nds/64thsCast IronSquare SGD 416.27
H
C11H-24-4R		224"Tempered SteelBlack Wrinkle4R8ths/16ths/Quick Reading 32nds/64thsCast IronSquare SGD 482.01
I
C33H-6-4R		26"Hardened and Tempered SteelSmooth Black Enamel4R8ths/16ths/32nds/64thsSteelSquare SGD 305.28
J
C434-12-16R		412"Tempered SteelSmooth Black16RQuick Reading 32nds/64ths/Aircraft Quick Reading 50ths/100thsSteelSquare, Center, Protractor SGD 889.21

Combination Squares

Starrett combination squares comprise a rule and one or more interchangeable heads which can be attached to the rule. The brand's combination squares feature a square head which comes equipped with a reversible lock bolt, scriber & spirit level. They also have a hardened steel, photo engraved blade featuring regular or satin chrome finish. Choose from a wide range of these combination squares, available in 300 mm, 18 inch and 24 inch blade lengths on Raptor Supplies.

Uses

Starrett combination squares are used for ensuring the integrity of a 90-degree angle, measuring a 45-degree angle, measuring the centre of a circular object, finding depth and evaluating simple distance measurements. Starrett combination squares can also be used to determine level and plumb using the spirit level vial.

Working Mechanism

Starrett combination squares consist of a rue-type blade attached to a handle. The handle is composed of two parts, a shoulder and an anvil. The shoulder is placed at an angle of 45 degrees against the blade, for the measurement and layout of mitres. The anvil is placed at a 90-degree angle between itself and the blade. The handle contains an adjustable knob that allows it to move horizontally along the edge of the ruler. A scriber and a vial are located within the head of the handle for marking measurements and measuring plumb & level, respectively.

Features

  • Starrett combination squares feature a machine-divided, tempered-steel blade / ruler and a cast-iron square head with black wrinkle finish. The components of Starrett combination squares are interchangeable, so they can be used with a longer ruler / blade and a centre / protractor head to suit various applications.
  • The square head has a precision-ground, 90-degree square face and 45-degree mitre face. It can be used as a layout tool for scribing right angles and parallel lines, and as a tri-square / mitre / depth gauge / height gauge / level for various measuring applications.
  • Starrett combination square sets consist of a reversible lock bolt, scriber and spirit level.
  • The reversible lock bolt ensures proper alignment of the blade with the heads and enables the blade to be turned over without removing the lock bolt or nut.

Installation

  • Tap a white piece of paper onto a board with a perfectly straight edge.
  • Place the anvil of the square against this edge and draw a line on the outside edge of the blade.
  • Turn over the square and draw a second line at least 1/32 inches away from the first line.
  • If the two lines drawn are parallel to each other, then the Starrett combination square is accurate.
  • To test the accuracy of the shoulder, simply gauge the angle it makes with the blade against a 45-degree drafting triangle.
  • If the angle between the shoulder and the blade is the same as that of the triangle, then the square is accurate.

Frequently Asked Questions

How do you mark gauge or strike a line using Starrett combination squares?

When laying out joinery, it is often useful to strike a line parallel to the edge of the piece you are working on, using a dedicated marking gauge. You can achieve this by setting the square to the desired offset and running the square down the side of the piece with one hand while striking the line with the scriber or a marking knife pressed up against the rule. This process is also a great way to quickly and accurately transfer measurements to multiple workpieces.

What is the pointy thing on a combination square?

Most combination squares have a removable pointed pin called a scribe that can be used to mark measurements on the object being squared.

How do you check tenons and similar joinery using Starrett combination squares?

By setting the blade at the desired depth, you can use the combo square to test the accuracy of the cheeks and shoulders of your tenons.

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