THE ABC'S OF PLUG GAGES
Plug Gage Measuring - the art of using pre-sized precision
metal plugs to determine the acceptability of diameters of drilled
or machined holes. The difference between any class of gage is
not the wear or life span of the gage, it's the tolerance which
is allowed in the manufacturing process of the gage.
GO/NOGO Measurement - A GO gage is used to check the
lower limit of a hole. A NOGO gage is used to check the upper
limit of a hole. If the GO gage enters the hole and the NOGO
gage is unable to enter, the design specifications of the hole
have been met.
Uses - for precision GO/NOGO measuring of hole sizes
and depths, checking hole location and distance, and setting
micrometers. All gages are uniformly 2” long with ground
ends, allowing you to use both ends for increased gage life.
Gages are Carbon Chrome Alloy Steel (grade 52100 bearing quality
steel) and heat treated to a 60-62 Rockwell C hardness. All of
our products come with a Certificate of Class Conformance, traceable
to NIST (National Institute for Standards Technology). The size
and “+” (GO) or “-” (NOGO) are laser etched
with a Meyer Exclusive Serial Number feature to ensure traceability
on your shop floor on all gages that are .061” and larger.
Class ZZ Gages - These gages have an inch tolerance
of .0002” and a metric tolerance of .005mm. They are practical
where good precision and speed are important.
Class Z Gages - These gages have an inch tolerance
of .0001” and a metric tolerance of .0025mm. They are one
half the deviation of the ZZ for a better fit.
Class X Gages - These gages are available with an inch
tolerance of .00004” and a metric tolerance of .001mm. These
gages are used where greater precision is needed.
Class XX Gages - These gages have an inch tolerance
of .00002” and a metric tolerance of .0005mm. They are one
half of the deviation of the X. Great for your most critical
needs.
Length and Finish - All gages are 2 inches or 51mm
long with ground ends for long life.
52100 Steel - This is bearing quality, Carbon Chrome
Alloy Steel, heat treated to 60-62 Rockwell C hardness and is
considered the preferred material for the highest quality plug
gages.
Certificate of Class Conformance - Assurance issued
with each shipment of quality gages that conformance characteristics
are traceable to NIST.
NIST - National Institute of Standards and Technology
Serial Number Etching - A feature that is exclusive
to Meyer Gages and essential in assuring traceability on the
shop floor on all gages over .060”.
Gage Makers Tolerance Chart
Plain Plug, Plain Ring & Master Gage Tolerances |
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|
RANGE |
CLASS |
|
|
|
|
|
XX |
X |
Y |
Z |
ZZ |
|
|
|
INCH |
|
|
|
.0009" to .8250" |
.000020" |
.000040" |
.000070" |
.000100" |
.000200" |
|
.8251" to 1.5100" |
.000030" |
.000060" |
.000090" |
.000120" |
.000240" |
|
1.5101" to 2.5100" |
.000040" |
.000080" |
.000120" |
.000160" |
.000320" |
|
2.5101" to 4.5100" |
.000050" |
.000100" |
.000150" |
.000200" |
.000400" |
|
4.5101" to 6.5100" |
.000065" |
.000130" |
.000190" |
.000250" |
.000500" |
|
6.5101" to 9.0100 |
.000080" |
.000160" |
.000240" |
.000320" |
.000640" |
|
9.0101" to 12.2600" |
.000100" |
.000200" |
.000300" |
.000400" |
.000800" |
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|
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METRIC |
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|
|
1.00mm to 21.00mm |
.0005mm |
.0010mm |
.0018mm |
.0025mm |
.0050mm |
|
21.01mm to 38.00mm |
.0008mm |
.0015mm |
.0023mm |
.0030mm |
.0060mm |
|
38.01mm to 64.00mm |
.0010mm |
.0020mm |
.0030mm |
.0040mm |
.0080mm |
|
64.01mm to 115.00mm |
.0013mm |
.0025mm |
.0038mm |
.0050mm |
.0100mm |
|
115.01mm to 165.00mm |
.0017mm |
.0033mm |
.0048mm |
.0060mm |
.0130mm |
|
165.01mm to 230.00mm |
.0020mm |
.0041mm |
.0061mm |
.0080mm |
.0160mm |
|
230.01mm to 300.00mm |
.0025mm |
.0051mm |
.0076mm |
.0100mm |
.0200mm |
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