McMaster-Carr logo
    Filter by
    System of Measurement
    Blade Length
    Arm Length
    Thickness
    Width
    Export Control Classification Number (ECCN)
    Industrial Info Snippet
    Blade Graduations
    Edge Shape
    Measurement Scale Type
    DFARS Specialty Metals
    Head Length
    Attribute Image
    Numeric Graduations
    Head Material
    Blade Width
    Head Graduations
    Head Width
    Forward
    Enter e-mail addresses in the fields below
    Message
    Cancel
    Print
    How can we improve?
    Comments
    E-mail address (if you would like a response)
    20 Products

    Rolling Parallel Rules

    Image of Product. Front orientation. Parallel Rules. Rolling Parallel Rules.
    A rule, compass, protractor, and template all in one tool.
    Graduations
    Head
    Material
    Blade
    Lg.
    Max. Circle
    Dia.
    Blade
    Rolling
    Scale
    Each
    Plastic12"24"1/16", 1 mm1/32", 1 mm000000000000

    Multi-Angle Transfers

    Image of Product. Shown in Multiple Configurations. Front orientation. Contains MultipleImages. Angle Transfers. 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
    No. of
    Arms
    Arm
    Length
    Numeric
    Graduations
    Wd.
    Material
    Color
    Graduation
    Type
    Graduations
    Graduation
    Color
    Each
    44"/12 cm
    10"/25 cm    		1"/1 cm
    1"/1 cm    		1"Aluminum
    		BlackEtched1/16", 1 mmWhite00000000000000

    Drafting Rulers

    Image of Product. Front orientation. ZoomedIn view. Rulers. Drafting Rulers, Flat.
    Image of Product. Side2 orientation. Rulers. Drafting Rulers, Triangle.

    Flat

    Triangle

    Sketch buildings, roads, and other life-size objects to scale. These rulers feature the standard scales used by architects or engineers. All have beveled edges, so you can be confident your lines will be accurate and consistent no matter what angle you view the ruler from.
    Triangle—To quickly identify the scale you need, these rulers have a different-colored groove on each of their three sides.
    Measurement Scale Type
    Scale
    Material
    Blade
    Lg.
    Each
    Inch
     
    Flat
    Architects'1/8, 1/4, 3/8, 1/2, 3/4, 1, 1 1/2, 3Plastic12"000000000000
     
    Triangle
    Architects'3/32, 1/8, 3/16, 1/4, 3/8, 1/2, 3/4, 1, 1 1/2, 3, 16Plastic12"00000000000
    Engineers'10ths, 20ths, 30ths, 40ths, 50ths, 60thsPlastic12"00000000000
     
    Metric
     
    Triangle
    Architects'1:500, 1:400, 1:300, 1:250, 1:200, 1:100Plastic30 cm000000000000
    Architects', Engineers'1:125, 1:100, 1:75, 1:50, 1:25, 1:20Plastic30 cm000000000000
     

    Rulers

    Your go-to rulers for everyday measuring. Whether metal for durability or wood for a classic feel, our rulers measure up to most tasks, from woodwork to textiles to rough machining.
    Corrosion-Resistant Stainless Steel
    Image of Product. Front orientation. Rulers. Rulers, Corrosion-Resistant Stainless Steel.
    Our most corrosion-resistant rulers. These rulers won't rust when rinsed, rained on, or wiped down with degreasers or cleaning solutions. They're hardened to prevent dents and scratches, so you can trust they'll last for years to come. Etched and filled with black ink, their graduations won't rub off like printed graduations can.
    Length—For easy handling and storage, rulers that are 96" or longer come in multiple pieces that line up to create a complete ruler.
    Rulers
    Lg.
    Front Graduations (Numeric
    Graduations)
    Back Graduations (Numeric
    Graduations)
    Wd.
    Thk.
    Each
    Inch
     
    Left-to-Right Reading Direction
    12"1/32" (4/32"), 1/64" (8/64")1/10" (1/10"), 1/50" (1/10")1"3/64"000000000000
     

    Folding Triangle Straightedges

    Image of Product. Front orientation. Straightedges. Folding Triangle Straightedges.
    Unfold and lock the corners to form a triangle for marking angles.
    Angle
    Measured
    Unfolded Size
    Wd.
    Thk.
    Material
    Each
    90°36" × 48" × 60"2"3/8"Aluminum
    		000000000000

    T-Profile Squares

    Image of Product. Plastic Head. Front orientation. Squares. T-Profile Squares, Inch, Plastic Head.
    Image of Product. Aluminum Head. Front orientation. Squares. T-Profile Squares, Inch, Aluminum Head.

    Plastic Head

    Aluminum Head

    Draw and cut straight lines in drafting, graphics, and construction applications.
    Blade
    Head
    Graduations
    Head
    Material
    Blade
    Lg.
    Wd.
    Material
    Lg.
    Wd.
    Blade
    Head
    Each
    Inch
    Plastic24"2"Aluminum20"3"1/16"1/16"000000000000
    Aluminum
    		48"2"Aluminum22"1 1/2"1/8"1/8"000000000000
     

    Triangle Straightedge/Protractors

    Image of Product. Front orientation. Straightedge/Protractors. Triangle Straightedge/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.
    Lg.
    Angle
    Measured
    Angle Numeric
    Increments
    Each
    8"0° to 90°1/2°0000000000000
    10"0° to 90°1/2°000000000000

    Pocket Drafting Rulers

    Image of Product. Front orientation. ZoomedIn view. Rulers. Pocket Drafting Rulers, Triangle.

    Triangle

    For scaled-down drawings on the go, these rulers are no bigger than a pen to slip into your pocket. Sketch everything from roads to buildings to floor plans—they include the standard scales for architects or engineers. All have beveled edges, so you can be confident your lines will be accurate and consistent no matter what angle you view the ruler from.
    Triangle—To quickly identify the scale you need, these rulers have a different-colored groove on each of their three sides.
    Measurement Scale Type
    Scale
    Material
    Blade
    Lg.
    Each
    Inch
     
    Triangle
    Architects'3/32, 1/8, 3/16, 1/4, 3/8, 1/2, 3/4, 1, 1 1/2, 3, 16Aluminum
    		6"0000000000000
    Engineers'10ths, 20ths, 30ths, 40ths, 50ths, 60thsAluminum
    		6"000000000000
     
    Inch/Metric
     
    Triangle
    Architects', Engineers'1/8, 1/4, 16, 1:500, 1:100, 10ths, 50thsAluminum
    		6"000000000000
     

    Triangle Straightedges

    Image of Product. Front orientation. Straightedges. Triangle Straightedges, 30° × 60°.
    Image of Product. Front orientation. Straightedges. Triangle Straightedges, 45° × 45°.

    30° × 60°

    45° × 45°

    These triangles have raised edges.
    Lg.
    Choose a
    Color
    Each
    30° × 60°
    8"
    Clear
    ,
    Gray
    		000000000000
    10"
    Clear
    ,
    Gray
    		00000000000
     
    45° × 45°
    8"
    Clear
    ,
    Gray
    		00000000000
    10"
    Clear
    ,
    Gray
    		00000000000
     
    back to top