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Alpha Thread Gage, Inc.

"Leading the pack in the thread gage industry!"                                                                                  

·680 Ajax Drive, Madison Heights, MI 48071-4214·

1-800-267-0181 (TOLL FREE) · (248) 589-9310 · FAX (248)589-9315 · E-MAIL
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REFERENCE SHEET

Reference Sheets Available Basic Dimensions NPT Taper Thread Plug & Ring Gages • Unified Thread Gages- Thread Work Plugs • Unified Thread Gages-Thread Ring and Setting Plugs • Metric Thread Gages-Thread Work Plugs • Metric Thread Gages-Thread Rings & Setting Plugs • Class X Tolerances • Class W Tolerances • Class Y Tolerances
Click here to see how MAJOR, MINOR and PITCH DIAMETER TOLERANCES ARE APPLIED.
 
Thread Gage Tolerances
American National and Unified Form Threads
CLASS X TOLERANCES
For "GO'" and "NOT GO" Thread Gages
Threads Per Inch LEAD HALF ANGLE MAJOR or MINOR DIAMETERS PITCH DIAMETER
Plus or Minus Plus or Minus To and Incl. 4" Above 4" Diam. To and Incl. 1½" Above 1½" to 4" Incl. Above 4" to 8" Incl.
80 .0002 30 min. .0003   .0002    
72 .0002 30 min .0003   .0002    
64 .0002 30 min .0004   .0002    
56 .0002 30 min .0004   .0002 .0003  
 
48 .0002 30 min .0004   .0002 .0003  
44 .0002 20 min. .0004   .0002 .0003  
40 .0002 20 min. .0004   .0002 .0003  
36 .0002 20 min. .0004   .0002 .0003  
 
32 .0003 15 min. .0005 .0007 .0003 .0004 .0005
28 .0003 15 min. .0005 .0007 .0003 .0004 .0005
24 .0003 15 min. .0005 .0007 .0003 .0004 .0005
20 .0003 15 min. .0005 .0007 .0003 .0004 .0005
 
18 .0003 10 min.   .0007 .0003 .0004 .0005
16 .0003 10 min .0006 .0009 .0003 .0004 .0006
14 .0003 10 min .0006 .0009 .0003 .0004 .0006
13 .0003 10 min .0006 .0009 .0003 .0004 .0006
 
12 .0003 10 min .0006 .0009 .0003 .0004 .0006
11 .0003 10 min .0006 .0009 .0003 .0004 .0006
10 .0003 10 min .0006 .0009 .0003 .0004 .0006
9 .0003 10 min .0007 .0011 .0003 .0004 .0006
               
8 .0004 5 min. .0007 .0011 .0004 .0005 .0006
7 .0004 5 min. .0007 .0011 .0004 .0005 .0006
6 .0004 5 min. .0008 .0013 .0004 .0005 .0006
5 .0004 5 min. .0008 .0013   .0005 .0006
 
4½ .0004 5 min. .0008 .0013   .0005 .0006
4 .0004 5 min. .0009 .0015   .0005 .0006
Thread Gages are made to Class X tolerances unless otherwise specified on orders or drawings.
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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