Screwing Taps:

High Speed Steel Nut Taps

High Speed Steel
Nut Taps
Ground Threads 
  

 
Diameter Of Tap Threads Per Inch NC UNC Dimensions
Length Overall Length of thread Length of square Diameter of shnak
1/4 20 5 1 5/8 9/16 0.185
5/16 18 5 1/2 113/16 5/8 0.240
3/8 16 6 2 11/16 0.294
1/2 13 7 2 1/2 7/8 0.400

Dimension in inches.
Specifications conform to ANSI B 94.9-1971.
Chamfer length = 1/2 to 3/4 Length of thread tength.
These Taps are usually supplied with H3 Thread limit.

 
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