Rule Straightedges | McMaster-Carr

Filter by

System of Measurement

Length

Material

Reading Direction

Width

Graduations

Flexibility

Color

Measurement System

Numeric Graduations

Thickness

Graduation Type

Segment Length

Blade Length

Graduation Location

End Shape

Graduation Color

Orientation

Certificate Type

Calibration Certificate Traceable to NIST

Calibration Certificate with Test Data Traceable to NIST

Backing Material

Adhesive

Cork

Rubber

DFARS Specialty Metals

Overall Length

Performance

REACH

Export Control Classification Number (ECCN)

RoHS

753 Products

About High-Quality Rulers

What separates a throwaway ruler from one you’ll keep for decades, which type is best for everyday use, and how to compare materials.

Rulers

Horizontal Rulers

Rulers

Your go-to rulers for everyday measuring—available with certificates traceable to NIST

143 products

Adhesive-Back Rulers

Permanently stick to surfaces for repeated, hands-free measuring

174 products

High-Accuracy Rulers

Our most accurate rulers, with tolerances tight enough for machining detailed parts

134 products

Magnetic High-Accuracy Rulers

Take machine-shop-accurate measurements while keeping your hands free

7 products

Easy-Read Rulers

Measure where it's too bright or too dark to read a standard metal ruler

61 products

Pocket Rulers

No bigger than a pen for measuring on the go

8 products

See-Through Rulers

Made of clear plastic, so you won't lose sight of what you're measuring

6 products

Center-Finding Rulers

Quickly locate the center of workpieces without any math

8 products

Pocket Center-Finding Rulers

Tuck into your pocket to find the center of workpieces on the go

2 products

Folding Rulers

Combine the rigidity of a ruler with the portability of a tape measure

8 products

Magnetic Rulers

Measure hands-free without permanently mounting a ruler

3 products

Magnetic Ruler Sets

Keep multiple lengths on hand so you always have the size you need

1 product

Tape Rulers

Unwind from a roll and cut to the length you need, similar to masking tape

2 products

Rulers for Cutting

Prevent nicking your fingers while measuring and cutting straight lines

7 products

Yardsticks

Your everyday classroom yardsticks

1 product

Circumference-Measuring Rulers

Find the circumference of duct, pipe, and other cylindrical objects without doing math

2 products

Vertical Rulers

Measure height and depth without reading sideways

12 products

Adhesive-Back Vertical Rulers

Stick to walls and tanks for repeated, hands-free height and depth measurements

64 products

Rulers for Floors

Take repeated measurements of objects too heavy or too long to lift onto a workbench

9 products

Pica Rulers

Measure text, columns, margins, and other print elements in picas

4 products

Scale Rulers

Drafting Rulers

Sketch buildings, roads, and other life-size objects to scale

5 products

Pocket Drafting Rulers

Slip into your pocket for scaled-down drawings on the go

3 products

Half-Measure Adhesive-Back Rulers

Take division out of the equation when building half-scale models and prototypes

14 products

Half-Measure Adhesive-Back Vertical Rulers

Measure height while building half-scale models and prototypes—no division required

4 products

Other Products

Squares

Check 90° angles during layout work with combination, angle, or pipefitters' squares

32 products

Diameter Identifiers

Tighten the strap around rods, drill bits, and other small items to measure outer diameter

1 product

Parallel Rules

Draw parallel lines, as well as circles, arcs, and angles

1 product

Staff Gauges

Typically mounted to walls and tanks for measuring the level of liquids, such as water, fuel, and oil

32 products

Magnifiers

Workstation, hand-held, headband, and eyeglass magnifiers

1 product

Levels

Ensure surfaces are completely horizontal or vertical

4 products