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conlo
03-28-2005, 12:38 PM
I have some old taps that are marked 3/16-24 and 3/16-32. Are thest equivalent to some number sizes? They look close to the numbers 10 and 12

egpace
03-28-2005, 12:49 PM
conlo,
No, they are for UNF & UNEF threads, and should be marked UF & UEF. 3/8 - 16 is Coarse (UNC) 3/8 - 24 fine, and 3/8 - 32 extra fine. See the link below.
Ed


http://www.simpsonenterprises.biz/tech_specs_unified_ring.html

vmil3
03-28-2005, 01:08 PM
3/16 24 and 3/16 32 are NS taps but very close to 10/24 and 10/32
3/16 O.D. is .187"
#10 O.D. is .190"

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Doug

Live_SteamR
03-28-2005, 02:08 PM
Conlo,
Both of these taps are British. The 3/16 - 32 is a BSF and the 3/16 - 24 is a BSW.

The finer thread (3/16 - 32) can also be found as a BSCy [British Standard Cycle] but I do not see the coarser size listed in BSCy.

The 3/16 - 32 BSF has an OD of .188 and uses a 5/32 drill size - low engagement drill size #20 and a clearance drill size of #10.

The 3/16 - 24 BSW has an OD of .188 and uses #27, #24, & #11 drills respectively.

The 3/16 - 32 BSCy has an OD of .188 and the only 2 drill sizes I can locate are tap drill #20 and clearance drill #9.

Given this information, you can compare with the 10-32 and 10-24 UF & UNC but for exact fits use the British values.

Comparison values are also given in metric and may get you closer.
Jim