Drafting Straightedges | McMaster-Carr

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System of Measurement

Arm Length

Blade Length

DFARS Compliance

Measurement Graduation Marks

Shape

RoHS Compliance

REACH Compliance

Length

Color

Graduation Marks Scale

Angle Measured

Scale Type

Edge Shape

Head Material

Head Length

Blade Width

Measurement Numeric Increments

Blade Graduation Marks

Head Graduation Marks

Head Width

Rolling Scale Graduation Marks

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20 Products

T-Squares

Plastic Head

Aluminum Head

Draw and cut straight lines in drafting, graphics, and construction applications.

	Blade			Head		Graduation Marks
Head Material	Lg.	Wd.	Material	Lg.	Wd.	Blade	Head		Each
Plastic	24"	2"	Aluminum	20"	3"	16ths	16ths	000000	000000
Aluminum	48"	2"	Aluminum	22"	1 1/2"	8ths	8ths	0000000	00000

Rolling Parallel Rules

A rule, compass, protractor, and template all in one tool.

			Graduation Marks
Head Material	Blade Lg.	Max. Circle Dia.	Blade	Rolling Scale		Each
Plastic	12"	24"	16ths, 1 mm	32nds, 1 mm	000000	000000

Folding Triangle Straightedges

Unfold and lock the corners to form a triangle for marking angles.

Angle Measured	Unfolded Size	Wd.	Thick.	Material		Each
90°	36" × 48" × 60"	2"	3/8"	Aluminum	000000	000000

Triangle Straightedges

30° x 60°

45° x 45°

These triangles have raised edges.

30° × 60°
Length	Choose a Color		Each
8"	Clear, Gray	0000000	00000
10"	Clear, Gray	0000000	0000
45° × 45°
8"	Clear, Gray	0000000	0000
10"	Clear, Gray	0000000	0000

Triangle Straightedges/Protractors

A protractor and triangle in one, use these tools to quickly set any angle from 0° to 90°. They also measure slope and rise.

Length	Angle Measured	Numeric Increments		Each
8"	0°-90°	1/2°	0000000	000000
10"	0°-90°	1/2°	0000000	00000

Architects’ and Engineers’ Scales

Flat

Triangle

Take measurements off of scaled architectural or engineering drawings with these specialized scales.

Flat with Beveled Edges
Scale Type	Graduation Marks	Blade Lg.		Each
Inch
Architects'	1/8", 1/4", 3/8", 1/2", 3/4", 1", 1 1/2", 3"	12"	0000000	000000
Flat with Square Edges
Inch
Engineers'	10ths, 32nds, 50ths, 64ths	12"	000000	00000
Triangle with Beveled Edges
Inch
Architects'	3/32", 1/8", 3/16", 1/4", 3/8", 1/2", 3/4", 1", 1 1/2", 3", 16"	12"	000000	0000
Engineers'	10ths, 20ths, 30ths, 40ths, 50ths, 60ths	12"	000000	0000
Metric
Architects'	1:500, 1:400, 1:250, 1:200, 1:100	30cm	0000000	00000
Architects', Engineers'	1:125, 1:100, 1:75, 1:50, 1:25, 1:20	30cm	0000000	00000

Pocket Architects’ and Engineers’ Scales


	Inch
	Inch, Metric

Small enough to fit into your pocket, the blade is narrow and only 6" long. These scales are often used for taking measurements off scaled architectural or engineering drawings.

Triangle with Beveled Edges
Scale Type	Graduation Marks	Blade Length		Each
Inch
Architects'	3/32", 1/8", 3/16", 1/4", 3/8", 1/2", 3/4", 1", 1 1/2", 3", 16"	6"	0000000	000000
Engineers'	10ths, 20ths, 30ths, 40ths, 50ths, 60ths	6"	0000000	00000
Inch, Metric
Architects', Engineers'	1/8", 1/4", 16", 10ths, 50ths, 1:500, 1:100	6"	0000000	00000

Multi-Angle Transfers

Shown in Multiple Configurations

Transfer multiple angles, draw parallel lines, or create a template to make repeated patterns and measurements. Adjust the four arms on these transfers to the desired shape, and tighten the nuts to lock them in place. They’re often used as layouts for stairs and window sills or patterns in tile.

			Blade
Number of Arms	Arm Lg.	Numeric Increments	Wd.	Material	Color	Graduation Mark Style	Graduation Marks	Graduation Color		Each
4	4"/12 cm 10"/25 cm	1”/1 cm 1”/1 cm	1"	Aluminum	Black	Etched	16ths, Millimeters	White	00000000	000000