Drafting Straightedges | McMaster-Carr

	System of Measurement System of Measurement

Inch

Metric

	Blade Length Blade Length

12"

24"

48"

	Graduation Marks Graduation Marks

	Arm Length Arm Length

10"

12cm

25cm

	Head Material Head Material

Plastic

Aluminum

	Scale Type Scale Type

Architects'

Engineers'

	Blade Graduation Marks Blade Graduation Marks

1 mm

8ths

16ths

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Color Color

	Clear
	Gray
	Black

	Angle Measured Angle Measured

	Shape Shape

Flat

Triangle

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	Head Length Head Length

20"

22"

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	Blade Width Blade Width

	Numeric Increments Numeric Increments

1/2°

1 cm

	Head Width Head Width

1 1/2"

	Length Length

10"

	Rolling Scale Graduation Marks Rolling Scale Graduation Marks

1 mm

32nds

	Head Graduation Marks Head Graduation Marks

8ths

16ths

	Edge Shape Edge Shape

15 Products

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

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

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

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
Architects'	1/8", 1/4", 3/8", 1/2", 3/4", 1", 1 1/2", 3"	12"	0000000	00000
Flat with Square Edges
Engineers'	10ths, 32nds, 50ths, 64ths	12"	000000	00000
Triangle with Beveled Edges
Architects'	3/32", 1/8", 3/16", 1/4", 3/8", 1/2", 3/4", 1", 1 1/2", 3", 16"	12"	000000	00000
Engineers'	10ths, 20ths, 30ths, 40ths, 50ths, 60ths	12"	000000	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

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