Snap Gages Information

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Snap gages are used in production settings where specific diametrical or thickness measurements must be repeated frequently with precision and accuracy.  Snap gages are mechanical gages that use comparison or the physical movement and displacement of a gaging element (e.g., spindle, slide, stem) to determine the dimensions of a part or feature.  In this case, snap gages are similar to micrometers, calipers, indicators, plug gages, and ring gages.  Snap gages are for both English and metric measurement configurations.


Snap gages are available in fixed and variable forms.  The variable forms often have movable, top sensitive contact attached to an indicator or comparator. The nonadjustable or fixed limits forms typically have a set of sequential gaps for go / no-go gaging of product thickness or diameter.  


Fixed limit snap gages are factory set or are otherwise not adjustable by the user.  A common example of this type of device is the AGD fixed limit style snap gage. These gages are set to go and no-go tolerances. A snap gages’ go contact dimensions are based on the maximum tolerance of the round bar, thickness or part feature being gaged.  No-go contact dimensions are based on the minimum tolerance of the round bar, thickness, or part feature being gaged by the snap gage.


Variable, or top sensitive contact, snap gages use a variable contact point that moves up during part gaging.  The contact point moves providing a go to no go gaging range.  The top contact is normally connected to a dial indicator that provides visual indication of any diametrical or thickness variations.

Optional Features

There are a number of optional snap gage features that can aid in gaging speed or extending the measurement range of a particular snap gage.  These features include interchangeable anvils, locking and back or part support.  Snap gages having replaceable anvils, contact points, styli, spindles, or other contacting tips or faces allow for gaging of many different items easily.  Back or part support involves a protrusion or stem located behind a part to hold or stop the part from moving past a certain point during gaging.  Similarly, lockable devices have a slide or spindle on the gage that can be locked in a fixed position.  Both of these features can be used to quickly foster go / no-go gaging.

Related Products & Services

  • 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.

  • Masters and Setting Gages

    Masters and setting gages provide dimensional standards for calibrating other gages.

  • Optical Micrometers and Laser Micrometers

    Laser micrometers measure extremely small distances using laser technology.

  • 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.

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