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Class W Tolerances

Alpha Thread Gage, Inc.

Mailing address:
  PO Box 261
 

 Royal Oak, MI  
  48068-0261

E-MAIL: alphathread@aol.com

Leading the pack in the thread gage industry.

 

PHONE (248) 585-5800 · FAX (248) 583-9800

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REFERENCE SHEET

Reference Sheets Available [ Thread Gage Tolerances- Class Y Tolerances ] [ Thread Gage Tolerances- Class W Tolerances ] [ Thread Gage Tolerances- Class X Tolerances ] [ Metric Thread Gages-Thread Rings & Setting Plugs ] [ Metric Thread Gages-Thread Work Plugs ] [ American National Taper Pipe Thread Gages-NPT ] [ Pipe Thread Gages ] [ Unified Thread Gages- Thread Work Plugs- Pitch Diameter Chart ] [ Unified Thread Gages- Thread Ring and Setting Plugs ] [ Gage Pipe Plugs- Internal and External ]

 Click here to see how MAJOR, MINOR and PITCH DIAMETER TOLERANCES ARE APPLIED.

Thread Gage Tolerances
American National and Unified Form Threads
CLASS W TOLERANCES
For "GO'" and "NOT GO" Thread Gages
Threads Per Inch LEAD HALF ANGLE/ Plus or Minus MAJOR and MINOR DIAMETERS PITCH DIAMETER TOTAL CUMULATIVE TOLERANCE
To & Inc. ½" Dia. Above ½" Dia. To & Inc. ½" Dia. Above ½" to 4" Above 4" Diam. To & Inc. ½" Dia. Above ½" to 1½" Above 1½" to 4" Above 4" to 8" To & Inc. ½" Dia. Above ½" to 1½" Above 1½" to 4" Above 4" to 8"
80 .0001 .00015 20 min. .0003 .0003   .0001 .00015     .00038 .00052    
72 .0001 .00015 20 min. .0003 .0003   .0001 .00015     .00039 .00053    
64 .0001 .00015 20 min. .0003 .0004   .0001 .00015     .00041 .00055    
56 .0001 .00015 20 min. .0003 .0004   .0001 .00015 .0002   .00043 .00057 .00062  
48 .0001 .00015 18 min. .0003 .0004   .0001 .00015 .0002   .00044 .00057 .00062  
 
44 .0001 .00015 15 min. .0003 .0004   .0001 .00015 .0002   .00042 .00056 .00061  
40 .0001 .00015 15 min. .0003 .0004   .0001 .00015 .0002   .00044 .00057 .00062  
36 .0001 .00015 12 min. .0003 .0004   .0001 .00015 .0002   .00042 .00056 .00061  
32 .0001 .00015 12 min. .0003 .0005 .0007 .0001 .00015 .0002 .00025 .00044 .00057 .00062 .00067
28 .00015 .00015 8 min. .0005 .0005 .0007 .0001 .00015 .0002 .00025 .00048 .00053 .00058 .00063
 
24 .00015 .00015 8 min. .0005 .0005 .0007 .0001 .00015 .0002 .00025 .00051 .00056 .00061 .00066
20 .00015 .00015 8 min. .0005 .0005 .0007 .0001 .00015 .0002 .00025 .00053 .00058 .00063 .00068
18 .00015 .00015 8 min. .0005 .0005 .0007 .0001 .00015 .0002 .00025 .00055 .00060 .00065 .00070
16 .00015 .00015 8 min. .0006 .0006 .0009 .0001 .0002 .00025 .0003 .00058 .00068 .00073 .00078
 
14 .0002 .0002 6 min. .0006 .0006 .0009 .00015 .0002 .00025 .0003 .00068 .00073 .00078 .00083
13 .0002 .0002 6 min. .0006 .0006 .0009 .00015 .0002 .00025 .0003 .00070 .00075 .00080 .00085
12 .0002 .0002 6 min. .0006 .0006 .0009 .00015 .0002 .00025 .0003 .00071 .00076 .00081 .00086
11 .0002 .0002 6 min. .0006 .0006 .0009 .00015 .0002 .00025 .0003 .00073 .00078 .00083 .00088
 
10   .00025 6 min.   .0006 .0009   .0002 .00025 .0003   .00089 .00094 .00099
9   .00025 6 min.   .0007 .0011   .0002 .00025 .0003   .00092 .00097 .00102
8   .00025 5 min.   .0007 .0011   .0002 .00025 .0003   .00091 .00096 .00101
7   .0003 5 min.   .0007 .0011   .0002 .00025 .0003   .00103 .00108 .00113
 
6   .0003 5 min.   .0008 .0013   .0002 .00025 .0003   .00108 .00113 .00118
5   .0003 4 min.   .0008 .0013     .00025 .0003     .00112 .00117
4½   .0003 4 min.   .0008 .0013     .00025 .0003     .00116 .00121
4   .0003 4 min.   .0009 .0015     .00025 .0003     .00121 .00126
MAJOR, MINOR and PITCH DIAMETER TOLERANCES ARE APPLIED AS FOLLOWS:
  MAJOR DIAMETER FULL FORM MAJOR DIAMETER TRUNCATED SECTION PITCH DIAMETER MINOR DIAMETER
"GO" Work Plug Plus   Plus  
"NOT GO" Work Plug Minus   Minus  
"GO" Ring     Minus Minus
"NOT GO" Ring     Plus Plus
"GO" Set Plug Plus Minus Minus  
"NOT GO" Set Plug Plus Minus Plus  

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