Rulers | McMaster-Carr

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1,593 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

Tap and Drill Chart/Rulers

Reference tap and drill sizes, measure in inches, and convert to decimals with one tool

1 product

Combination Square Blades

Connect to a combination square head to create a combination square

18 products

Tape Measures

Standard, long, center-finding, and flexible tape measures

240 products

Staff Gauges

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

32 products

Squares

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

125 products

Calipers

Take inside, outside, and depth measurements with more precision than a ruler

210 products

Depth Gauges

Reach into slots, counterbores, and other holes to measure depth

36 products

Diameter Identifiers

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

1 product

Protractors

Set bevels and measure angles with everything from pocket-size to long-arm protractors

36 products

Parallel Rules

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

1 product

Straightedge/Protractors

Draw straight lines and measure angle, slope, and rise with one tool

2 products

Combination Square Heads

Attach combination square blades to form a combination square

28 products

Linear Scales

Measure and display the position of tools on machines, such as lathes, saws, and drill presses

24 products

Pipe Size Chart/Rulers

Curl around pipe to gauge its size, measure its diameter, or mark lines

3 products

Map Distance Measuring Tools

Slide across maps and blueprints to measure distances

4 products

Angle Transfers

Duplicate any angle in construction and other applications

2 products

Drafting Curves

Use as templates for drawing curved lines

2 products

Multitools

A variety of tools and blades all in one

22 products

Leveling Rods

Use with sight levels to estimate the distance between you and a given object

5 products

Magnifiers

Workstation, hand-held, headband, and eyeglass magnifiers

1 product

Tungsten Electrode Stick-Out Gauges

Measure the distance tungsten electrodes stick out from your nozzle for consistent TIG welding

2 products

Levels

Ensure surfaces are completely horizontal or vertical

4 products

Squareness Gauges

Check frames and machined parts to see if they are leaning or uneven

3 products

Liquid-Level Tape Measures

Lower into deep containers, such as tanks, to check the level of oil and other fluids

61 products

Step Gauges

Check step height, gap width, and distance between slots to make sure machine and engine parts align

2 products

Tape Measure Holders

Keep tape measures close at hand

2 products

Optical Comparators

Magnify your part to check for dimensional accuracy and surface defects

4 products