Length Measurement | McMaster-Carr

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System of Measurement

Length

Material

Certificate Type

Accuracy Certificate Traceable to NIST

Calibration Certificate

REACH

Compliant

Not Compliant

RoHS

Compliant

Compliant with Exemptions

Not Compliant

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

Export Control Classification Number (ECCN)

2B201

3A001

EAR99

DFARS Specialty Metals

Plug Gauge Size

Gauge Measurement Type

No-Go

Size-Checking Gauge Class

Specifications Met

Distance Measured

Hardness

Surface Smoothness, RMS

Manufacturer

Width

Display Type

Reading Direction

Graduations

Color

Thickness

Thread Size

Gauge Size

Measuring Increments

4,677 Products

Measuring and Inspecting

Rulers

Horizontal, vertical, circumference, center-finding, and pica rulers

658 products

Linear Scales

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

40 products

Plug Gauges

Verify the diameter or threads of machined holes in finished parts; also called pin gauges

1,022 products

Go/No-Go Outside Diameter Gauges

Snap on rods and shafts to check if their outside diameters are within tolerance

20 products

Staff Gauges

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

32 products

Gauge Blocks

Confirm dies, fixtures, and other workpieces meet precise tolerances and calibrate measuring tools

738 products

Tape Measures

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

238 products

Wire, Rope, and Cord Length Measurers

Combine counters and reels to measure and wind wire, rope, cord, cable, or hose

22 products

Depth Gauges

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

60 products

Diameter Identifiers

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

1 product

Measuring Wheels

Roll along surfaces to measure distance

49 products

Laser Measurers

Point the laser to determine the distance to objects up to hundreds of feet away

11 products

Calipers

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

210 products

Variance Indicators

Identify small dimensional differences when checking part quality and alignment

345 products

Bore Gauges

Insert into a hole and expand the contacts to measure diameter

120 products

Height Gauges

Measure an object's height and mark workpieces for machining

49 products

Inside Hole Micrometers

Find the inside diameter of cylinders and rings

29 products

Feeler Gauges

Check gaps and alignment between machine parts and other surfaces

381 products

Welding Gauges

Check alignment, corner dimensions, and other weld measurements

2 products

OSHA/ANSI Safety Gauges

Confirm gaps in bench grinders and machine guards meet OSHA and ANSI safety requirements

3 products

Thickness Gauges

Move the thumb lever to quickly check the thickness of flat stock, pipe, or tubing

40 products

Map Distance Measuring Tools

Slide across maps and blueprints to measure distances

4 products

Precision Measuring Tool Sets

Multiple precision measuring tools in one convenient case

18 products

Inside Hole Calipers

Measure hard-to-reach areas, such as internal grooves and slots

12 products

Depth Micrometers

Measure slots, counterbores, and other holes more precisely than depth gauges

46 products

Micrometer Check Gauges

Confirm your outside or depth micrometers are accurate

1 product

Liquid-Level Tape Measures

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

61 products

Chain Wear Gauges

Check if your chain is worn out

20 products

Outside Micrometers

Apply even pressure to objects to measure thickness more precisely than thickness gauges

220 products

Bore Gauge Heads

Swap the head on your Mitutoyo electronic bore gauge for one with a different measuring range

19 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

5 products

Height Gauge Calibrators

Ensure height gauges are accurate

11 products

Inside/Outside Diameter Gauges

Mount your variance indicator to measure the diameter of rims, grooves, and shallow holes

2 products

Coordinate Measurement Machine Probes

Take 3D measurements of workpieces on your CMM or CNC machine to inspect for quality

12 products

Layout Calipers

Adjust the legs to measure an object and transfer those measurements to a tool or part

24 products

Parallel Rules

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

1 product

Magnifiers

Workstation, hand-held, headband, and eyeglass magnifiers

2 products

Optical Comparators

Magnify your part to check for dimensional accuracy and surface defects

19 products

GPS Navigators

Navigate on foot with real-time GPS data

1 product

Position Indicators

Track components on rotating spindles or lead screws to help adjust machinery quickly and precisely

71 products

Leveling Rods

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

5 products

Levels

Ensure surfaces are completely horizontal or vertical

6 products

Surface Finish Gauges

Compare your surface to the swatches to see if you’ve achieved the desired finish

4 products

Wristwatches

Display the time, date, and smart functions on your wrist and keep your hands free

2 products

Scales

Bench-top, hanging, floor, and conveyor scales

2 products

Electrical Power, Networking, and Controlling

Rotary Encoders

Track the distance, direction, and speed of travel of motor shafts, conveyors, and wheels

34 products

Linear Motion Position-Measuring Transmitters

Measure the position of an object moving in a straight line; also known as string pots

10 products

Potentiometers

Control speed, volume, and light intensity by varying electrical flow; also known as rheostats

6 products

Development Board Sensor Modules

Transform your development board into everything from an airflow monitor to a motion detector

5 products

Photoelectric Sensors

Detect objects from longer distances than proximity and ultrasonic sensors

7 products

Cylinder Position Sensors

Monitor your air cylinder rod's position and turn the cylinder on and off

8 products

Fabricating and Machining

Milling Machines

Manual and CNC machines for job shops or prototyping

14 products

Lathes

Turn, knurl, thread, mill, and drill workpieces

8 products

Fastening and Joining

Tungsten Electrode Stick-Out Gauges

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

2 products

Facility and Grounds Maintenance

Paint Line Marking Machines

Create clean lines on floors, ceilings, and paved surfaces

1 product

Safety Equipment

Pedometers

Record steps and miles while you walk and run

2 products