What is the difference between Pin and Plug Gages

Dongzkie

Involved In Discussions
#1
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.
 
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Jim Wynne

Staff member
Admin
#2
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.
Why does the lab put the 25mm gage in a different category (regardless of what it's called)? Is it a matter of pricing? If the tolerance class (Z) is the same as the rest of the pins, why should it matter?

In general, larger gages are referred to as "plugs," but I don't I don't think there's a standard definition that marks a size boundary.
 

Dongzkie

Involved In Discussions
#3
Why does the lab put the 25mm gage in a different category (regardless of what it's called)? Is it a matter of pricing? If the tolerance class (Z) is the same as the rest of the pins, why should it matter?

In general, larger gages are referred to as "plugs," but I don't I don't think there's a standard definition that marks a size boundary.
Yes you are right sir, its the matter of pricing, 1.00-10.00mm has the same price and the 25.00mm has different. i dont really understand, i bought the the item as PIN gage but they describe is plug gage.
 

Jim Wynne

Staff member
Admin
#4
Yes you are right sir, its the matter of pricing, 1.00-10.00mm has the same price and the 25.00mm has different. i dont really understand, i bought the the item as PIN gage but they describe is plug gage.
The only reason they differentiate is price. They could say that you get price "A" for everything less than 25mm, and price "B" for 25mm and up, and the result would be the same. Your insistence that the 25mm is a pin and not a plug won't make any difference.
 
T

trainerbob

#5
As Jim says, It dosen't matter. A pin gauge is a small plug gauge and a plug gauge is a large pin gauge. Call them whatever you like.
 

howste

Thaumaturge
Super Moderator
#7
The name isn't important.

Ask them what additional work they will do to justify the additional cost. If the answer is none, then ask for the same price.
 
A

aliasJohnQ

#8
Jim W: what do you think about this?
Using pin gages for a year or two or three, then throwing them out instead of calibration. I saw that happening at one place, and was wondering how much does that affect checking parts?
 

Jim Wynne

Staff member
Admin
#9
Jim W: what do you think about this?
Using pin gages for a year or two or three, then throwing them out instead of calibration. I saw that happening at one place, and was wondering how much does that affect checking parts?
The impact depends on how the pins are used, and how often. If pins are used only for say, checking clearance holes, where no precision fit is necessary, there might be no need to calibrate at all. On the other hand, if the pins are used in applications requiring precision and where there's likely to be wear on them, the strategy will be different.

In a large set of hundreds of pins, some might be be used every day and some, perhaps most, might never be used or will be used infrequently. In some cases just checking pins for wear or burrs is enough.

If full-blown calibration is necessary, it might be more economical to buy new pins than to pay for calibration, but in most cases it's best to try to segregate the frequently used pins and calibrate them rather than calibrating an entire set or throwing out perfectly good ones.
 
H

htquality

#10
If you don't verify you pin gages over time (and just buy new ones), you will never know if they were still good when you last used them. You will know that they were good when you bought them (or first verified them), but you will have no evidence that they remained within your required tolerance, so no evidence that all the measurements that you made after the initial calibration were within your tolerance. Again, it depends on your application...
 
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