4 ft. Long Rulers | McMaster-Carr

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System of Measurement

Reading Direction

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Width

Flexibility

Graduations

Numeric Graduations

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Maximum Length Measured

48"

120 cm

Certificate Type

Calibration Certificate Traceable to NIST

Calibration Certificate with Test Data Traceable to NIST

Graduation Type

Color

Segment Length

Orientation

Graduation Location

Graduation Color

Performance

Backing Material

DFARS Specialty Metals

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Export Control Classification Number (ECCN)

REACH

RoHS

Hole Diameter

Finish

38 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

14 products

Adhesive-Back Rulers

Permanently stick to surfaces for repeated, hands-free measuring

2 products

High-Accuracy Rulers

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

9 products

Easy-Read Rulers

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

4 products

Center-Finding Rulers

Quickly locate the center of workpieces without any math

1 product

Rulers for Cutting

Prevent nicking your fingers while measuring and cutting straight lines

1 product

Circumference-Measuring Rulers

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

1 product

Vertical Rulers

Measure height and depth without reading sideways

2 products

Adhesive-Back Vertical Rulers

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

1 product

Other Products

Staff Gauges

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

1 product

Levels

Ensure surfaces are completely horizontal or vertical

2 products