Length Measurement | McMaster-Carr

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System of Measurement

Length

Material

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Accuracy Certificate Traceable to NIST

Calibration Certificate

REACH

Compliant

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RoHS

Compliant

Compliant with Exemptions

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Export Control Classification Number (ECCN)

2B201

3A001

EAR99

DFARS Specialty Metals

Distance Measured

Plug Gauge Size

Width

Manufacturer

Gauge Measurement Type

Display Type

Size-Checking Gauge Class

Reading Direction

Graduations

Specifications Met

Hardness

Thickness

Gauge Size

Surface Smoothness, RMS

Color

Thread Size

Measuring Increments

Performance

Controlled Retraction

4,695 Products

Measuring and Inspecting

Rulers

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

674 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

1,026 products

Go/No-Go Outside Diameter Gauges

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

16 products

Gauge Blocks

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

738 products

Staff Gauges

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

32 products

Tape Measures

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

236 products

Measuring Wheels

Roll along surfaces to measure distance

49 products

Height Gauges

Measure an object's height and mark workpieces for machining

34 products

Height Gauge Calibrators

Ensure height gauges are accurate

3 products

Diameter Identifiers

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

1 product

Depth Gauges

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

35 products

Calipers

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

208 products

Wire, Rope, and Cord Length Measurers

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

21 products

Variance Indicators

Identify small dimensional differences when checking part quality and alignment

346 products

Laser Measurers

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

11 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

Inside Hole Calipers

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

12 products

Bore Gauges

Insert into a hole and expand the contacts to measure diameter

108 products

Thickness Gauges

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

40 products

Inside Hole Micrometers

Find the inside diameter of cylinders and rings

29 products

Map Distance Measuring Tools

Slide across maps and blueprints to measure distances

4 products

Bore Gauge Heads

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

19 products

Precision Measuring Tool Sets

Multiple precision measuring tools in one convenient case

18 products

OSHA/ANSI Safety Gauges

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

3 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

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

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

2 products

Magnifiers

Workstation, hand-held, headband, and eyeglass magnifiers

2 products

Optical Comparators

Magnify your part to check for dimensional accuracy and surface defects

4 products

GPS Navigators

Navigate on foot with real-time GPS data

1 product

Surface Finish Gauges

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

4 products

Layout Calipers

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

24 products

Position Indicators

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

47 products

Parallel Rules

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

1 product

Wristwatches

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

2 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

Scales

Bench-top, hanging, floor, and conveyor scales

2 products

Electrical

Rotary Encoders

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

26 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

Sensor Switch Transmitters

Monitor objects, switch equipment on and off, and send data to control systems with a single device

15 products

Fabricating and Machining

Milling Machines

Manual and CNC machines for job shops or prototyping

3 products

Lathes

Turn, knurl, thread, mill, and drill workpieces

4 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