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- Threading Tap to Drill Bit Chart -

---------------------------------------------------------------
Tap Size | Drill Bit Size | Tap Size | Drill Bit Size
----------------------------------+----------------------------
0-80 NF ---------------- 3/64" | 5/16-18 NC - letter "F" or 17/64"
1-64 NC ---------------- #53 | 5/16-24 NF - letter "I" or 9/32"
1-72 NF ---------------- #53 | 3/8-16 NC ---------------- 5/16"

2-56 NC ---------------- #50 | 3/8-24 NF --------------- 21/64"
2-64 NF ---------------- #50 | 7/16-14 NC ---------------- 3/8"
3-48 NC ---------------- #47 | 7/16-20 NF --------------- 25/64"
3-56 NF ---------------- #46 | 1/2-13 NC --------------- 27/64"
4-40 NC --------- #43 or 3/32" | 1/2-20 NF --------------- 29/64"
4-48 NF ---------------- #42 | 9/16-12 NC --------------- 31/32"

5-40 NC ---------------- #38 | 9/16-18 NF --------------- 33/64"
5-44 NF ---------------- #37 | 5/8-11 NC --------------- 17/32"
6-32 NC --------- #35 or 7/64" | 5/8-18 NF --------------- 37/64"
6-40 NF ---------------- #33 | 3/4-10 NC --------------- 21/32"
8-32 NC - #29(.136") or 9/64" | 3/4-16 NF --------------- 11/16"
8-36 NF - #29(.136") or 9/64" | 7/8-9 NC --------------- 49/64"

10-24 NC - #25(.150") or 5/32" | 7/8-14 NF --------------- 13/16"
10-32 NF - #21(.157") or 11/64" | 1-8 NC ---------------- 7/8"
1/4-20 NC -- #7(.201") or 13/64" | 1-14 NF --------------- 15/16"
1/4-28 NF -- #3(.213") or 7/32"
----------------------------------------------------------------------------

- National Pipe Tapered (NPT) Tap Chart -

----------------------------------------------------------------------------

1/8" NPT -------------- 21/32" | 3/4" NPT ------------- 59/64"
1/4" NPT -------------- 7/16" | 1" NPT ------------- 1-5/32"
3/8" NPT -------------- 37/64" | 1-1/4" NPT ------------- 1-1/2"
1/2" NPT -------------- 23/32" | 1-1/2" NPT ------------- 1-47/64"
----------------------------------------------------------------------------
14mm x 1.25 pitch (spark plug) use 15/32" or 12mm drill bit.




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Document statistics: Last modified on 2008-06-15 17:48:59 by DarkOne


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