Metric Rulers | McMaster-Carr

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602 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

71 products

Adhesive-Back Rulers

Permanently stick to surfaces for repeated, hands-free measuring

75 products

High-Accuracy Rulers

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

40 products

Magnetic High-Accuracy Rulers

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

3 products

Easy-Read Rulers

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

13 products

Pocket Rulers

No bigger than a pen for measuring on the go

5 products

See-Through Rulers

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

2 products

Center-Finding Rulers

Quickly locate the center of workpieces without any math

3 products

Pocket Center-Finding Rulers

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

1 product

Folding Rulers

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

1 product

Tape Rulers

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

1 product

Vertical Rulers

Measure height and depth without reading sideways

11 products

Adhesive-Back Vertical Rulers

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

8 products

Scale Rulers

Half-Measure Adhesive-Back Rulers

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

4 products

Other Products

Tape Measures

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

79 products

Diameter Identifiers

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

1 product

Calipers

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

140 products

Squares

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

24 products

Parallel Rules

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

1 product

Combination Square Blades

Connect to a combination square head to create a combination square

2 products

Staff Gauges

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

4 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

Depth Gauges

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

22 products

Squareness Gauges

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

3 products

Step Gauges

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

2 products

Liquid-Level Tape Measures

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

27 products