- 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.
/ cars / reference_information
|