Technical Information

  • Male NPT Identification Chart

The line drawings below depict the actual sizes of the various common NPT thread sizes. If you are unsure as to what thread size you are using lay your fittings over the appropriate drawing to determine its size.

  • Male AN/ORB Adapter Identification Chart

The line drawings below depict the actual sizes of the various common AN/ORB thread sizes. If you are unsure as to what size fittings you have lay your fittings over the approatiate drawing to determine its size.

NOTE: -AN and ORB thread are the same diameter. AN seals with the fare, ORB seals with an O-ring.


 

  • AN HEX Or Identification Chart

The line drawings below depict the actual sizes of the various common types of fittings, hoses and adapters. The number is SAE spanner size equivalent.

NPT  (National Pipe Thread )  
Thread Size Threads Per Inch Closets AN Size
1/16'' 27 3
1/8'' 27 4
1/4'' 18 6
3/8'' 18 8
1/2'' 14 10
3/4'' 14 12
1'' 11 -/1/2 16
1-1/4'' 11 -/1/2 20
1-1/2'' 11 -/1/2 24
2'' 11 -/1/2 32

 

AN Thread      
Thread Size Threads Size SAE Threads Per Inch Max Torque
-3 .3/8 24 8.75
-4 .7/16 20 11.5
-5 .1/2 20 14.3
-6 .9/16 18 16.25
-7 .5/8 18 19.5
-8 .3/4 16 29
-10 .7/8 14 35
-12 1 -/1/16 12 45
-16 1 -/5/16 12 70
-20 1-/5/8 12 85

 

AN NUT    
Hex Sizes B Nut AN Size S Nut Hose Side
-3 1/2''  
-4 9/16'' 23/32''
-6 11/16'' 7/8''
-8 7/8'' 1-1/32''
-10 1'' 1-7/26''
-12 1-1/4'' 1-7/16''
-16 1-1/2'' 1-3/4''
-20 2'' 2-5/16''