What is the difference between Pin and Plug Gages

Wayne

Gage Crib Worldwide
#11
I have purchased a Metric class Z pin gage 1.00 to 25.00, we use this pin gages to verify a Laser wire diameter scanner. I send the pin gages for external calibration, however the 25.00mm pin gage was describe as plug gage by the laboratory, the laboratory technician said that fixed limit gage greater than 12mm are categorize as plug gage and below 12mm will be categorize as pin gage. Please if anyone here can explain further about this.
Most basically a plug gage is a fixed limit gage used to check an internal feature. :cool: Size or shape does not change the descrption.

:read: Read ANSI/ASME B47.1.
Plug gages come it four types: Pin, Taperlock, Trilock and Annular.

The plug gauge type is based on the design of the plug gage, not the size or shape of the feature being tested. :agree1:
 
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DietCokeofEvil

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#12
In my lab, we differentiate according to tolerance. If its reversible class Z or ZZ and under 1.0005", its calibrated as a pin gage- we give one reading on each side. We pretty much call everything else a plug. Exceptions will be made for class X reversibles if we know they are part of a class X pin set, but that is rare.

We always try to incorporate our knowledge of the customer as well and calibrate according to what we see most.
 

Wayne

Gage Crib Worldwide
#13
There are many deferring opinions as to what should be called a PIN and what should be called a PLUG. :confused: When looking for the definitive answer we need to refer back to the official source, the place which set the standard and makes the definition: The National Standards Committee. :read:In this case they have published the answer in ANSI/ASME B41.1; paragraph 3.1

BTW: PIN is not even part of the official definition. I guess the joke is on us. :rolleyes:

Attached is a snippet from ANSI/ASME B47.1 Paragraph 3.1.
 

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elauder

#14
In our Calibration lab, we differentiate Pins and Plugs primarily by how we report the measured data on our customers certification.
Pins are generally described as a set, say, .250 to .500 in. as either a plus set or minus set, usually ZZ class. Plug gauges are usually individual or a small Go, No-Go set put together by the customer and are generally tighter tolerances, for example a Deltronic plug gauge, which has a tolerance of + 40, -0 µin. However, if an ordinary pin gage is sent in individually, we will calibrate it as a Plug gage.
The diference:
For a “Pin Gage Set”, we do not report individual data, we simply verify that each pin in within it’s tolerance along it’s length on all sides. Any pin that is out of tolerance is noted with the deviation reported.
For a “Plug Gauge”, we give data for both ends and middle on two axis, so a total of 6 data points are recorded and included on the certification. Accordingly, we charge more for plug gauges than for pin gauges. Some of our customers request that entire pin gauge sets be calibrated as plug gauges so they have the data.
On a side note: regarding calibrating only once, pins and plugs can grow!! I have seen even .500 in pins grow as much as 200 µin over a few years of annual calibration. If they are not annealed properly, the molecules relax over time and the gauge will grow out of tolerance.
Does any of this make sense?:confused:
 
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