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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 Y TOLERANCES
For "GO'" and "NOT GO" Thread Gages
Threads Per Inch LEAD HALF ANGLE MAJOR or MINOR DIAMETERS PITCH DIAMETERS
Plus or Minus Plus or Minus To and Incl. 4" Above 4" Diam. To and Including 1 1/2 Above 1½ To 4 Incl. Above 4" to 8" Inc.
From To From To From To
80 .0002 45 min. .0003   .0001 .0003        
72 .0002 45 min. .0003   .0001 .0003        
64 .0002 45 min. .0004   .0001 .0004        
56 .0002 45 min. .0004   .0001 .0006 .0001 .0006    
 
48 .0002 45 min. .0004   .0001 .0004 .0001 .0006    
44 .0002 30 min. .0004   .0001 .0004 .0001 .0006    
40 .0002 30 min. .0004   .0001 .0004 .0001 .0006    
36 .0002 30 min. .0004   .0001 .0004 .0001 .0006    
 
32 .0003 20 min. .0005 .0007 .0001 .0004 .0001 .0006 .0001 .0008
28 .0003 20 min. .0005 .0007 .0002 .0005 .0002 .0007 .0002 .0009
24 .0003 20 min. .0005 .0007 .0002 .0005 .0002 .0007 .0002 .0009
20 .0003 20 min. .0005 .0007 .0002 .0005 .0002 .0007 .0002 .0009
 
18 .0003 15 min. .0005 .0007 .0002 .0005 .0002 .0007 .0002 .0009
16 .0003 15 min. .0006 .0009 .0002 .0006 .0002 .0008 .0002 .0010
14 .0003 15 min. .0006 .0009 .0002 .0006 .0002 .0008 .0002 .0010
13 .0003 15 min. .0006 .0009 .0002 .0006 .0002 .0008 .0002 .0010
 
12 .0003 10 min. .0006 .0009 .0002 .0006 .0002 .0008 .0002 .0010
11 .0003 10 min .0006 .0009 .0002 .0006 .0002 .0008 .0002 .0010
10 .0003 10 min .0006 .0009 .0002 .0006 .0002 .0008 .0002 .0010
9 .0003 10 min .0007 .0011 .0002 .0007 .0002 .0009 .0002 .0011
 
8 .0004 5 min. .0007 .0011 .0002 .0007 .0002 .0009 .0002 .0011
7 .0004 5 min. .0007 .0011 .0002 .0007 .0002 .0009 .0002 .0011
6 .0004 5 min. .0008 .0013 .0003 .0008 .0003 .0010 .0003 .0012
5 .0004 5 min. .0008 .0013     .0003 .0010 .0003 .0012
 
4½ .0004 5 min. .0008 .0013     .0003 .0010 .0003 .0012
4 .0004 5 min. .0009 .0015     .0003 .0011 .0003 .0013
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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