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(248) 585-5800   FAX: (248) 583-9800

PO Box 133, Royal Oak, MI 48068-0133

 

Reference Aids: Unified Work Plugs | Rings & Setting Plugs | Pipe Thread Gages | Pipe Plugs | Thread Work Plugs | Metric Thread & Plugs | Class Y Tolerances | Class x Tolerances | Class W Tolerances | American National Taper Pipe Thread Gages
Thread Gage Tolerances
American National and Unified Form Threads
CLASS Y TOLERANCES
For "GO'" and "NOT GO" Thread Gages

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

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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