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Calipers

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About Calipers

Calipers typically use a precise slide movement for inside, outside, depth or step measurements. Specialized slide type calipers are available for center, depth and gear tooth measurement and gaging machine table travel.  Some caliper types such as spring / fay or firm joint calipers do not usually have a graduated scale or display and are used for comparing or transferring dimensions.

Common types of calipers include center measuring, gear tooth, machine travel, nib jaws, pocket or rolling mill, slide caliper, and spring or firm-joint.  A center measuring caliper has conically pointed jaws designed to measure the distance between the centers of two holes.  A gear tooth caliper has an adjustable tongue designed to measure the thickness of gear teeth at the pitch line.  The adjustable tongue sets the measurement depth at the pitch line or addendum.  Machine travel calipers are designed to measure the travel or position changes of a machine bed, table, or stage.  These gages are typically mounted on a machine or are built into a product including machine tools, microscopes, and other instruments requiring precision dimensional measurement or position control.  Nib shaped jaws facilitate measurement of inside features (ID), outside features (OD), grooves, slots, keyways or notches. Compared to the blade edge typically found on standard calipers, the nib is more easily and accurately located on an edge or groove.  Small, pocket-sized calipers are usually designed for low precision gaging applications.  Rolling mill calipers are usually simple rugged devices for quick gaging of stock in production environments.  Sliding calipers use a precise slide movement for inside, outside, depth or step measurements. While calipers do not typically provide the precision of micrometers, they provide a versatile and broad range of measurement capability: inside (ID), outside (OD), depth, step, thickness and length.  Spring, Fay, firm-joint or other radially opening type calipers have jaws that swing open with a scissor or plier-type action.  These calipers are commonly found in non-graduated versions; although units with graduated, dial, or digital displays are available. 

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Products & Services Related to Calipers

Air Gages
Air gages use pneumatic pressure and flow to measure or sort dimensional attributes.
Dimensional Gages and Instruments
Dimensional gages and instruments provide quantitative measurements of product or component dimensional and form attributes such as wall thickness, depth, height, length, inner diameter (ID), outer diameter (OD), taper or bore.
Laser Micrometers
Laser micrometers measure extremely small distances using laser technology.
Masters and Setting Gages
Masters and setting gages provide dimensional standards for calibrating other gages.
Plug and Pin Gages
Plug and pin gauges are used to compare hole and slot dimensions or locations to specific tolerances. This product area includes go gauges and no-go gauges. 
Ring Gages
Ring gages are used for go / no-go assessment compared to the specified dimensional tolerances or attributes of pins, shafts, or threaded studs.
Thread Gages
Thread gages are dimensional instruments for measuring and/or verifying thread size, pitch or other parameters.

Other Topics You Might Be Interested In

  • What You Must Know About Calipers
    For the curious, the word caliper is short for caliper compass, which was a device with curved legs used to measure the caliber, or bore, of cannon and small arms. In today's machine shop, calipers...
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  • Internal Calipers
    Internal calipers use a precise slide movement for inside, outside, depth or step measurements. While calipers do not typically provide the precision of micrometers, they provide a versatile and broad...
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  • Caliper Basics
    Calipers are extremely versatile tools for making a wide range of distance measurements, including both outside diameters (OD) and inside diameters (ID). While micrometers are more accurate, they have...
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Engineering Web: Calipers

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Digital Calipers, Digital Caliper - Cole-Parmer Catalog
Cole-Parmer Catalog > Tools > Calipers > Digital Calipers Battery-powered calipers with LCD Caliper and Data Acquisition Kit, SS, 0-6"
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Micrometer Calipers
Micrometer Calipers JavaScript Disabled
See Grainger Industrial Supply Profile & Catalog
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Part Numbers for Calipers

Part # Distributor Manufacturer Product Category Description
1XHP6 Grainger Industrial Supply GENERAL TOOLS Digital Calipers Fractional Digital Caliper,0 to 6 In
4KU76 Grainger Industrial Supply GRAINGER INTERNATIONAL INC. Vernier Calipers Vernier Caliper,0-12 In,2.5 In D
2ZA59 Grainger Industrial Supply GRAINGER INTERNATIONAL INC. Digital Calipers Digital Caliper,0-6 In,1.56 In Deep Jaw

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