TapDrill Sizes Unified Unified Coarse Thread Thread Size mm Inch Thread Size mm Inch 1 - 64 UNC 1.50 53 0 - 80 UNF 1.25 3/64" 5/16" - 18 UNC 6.80 F 1/4" - 28 UNF 5.50 3 3/8" - 16 UNC 8.25 5/16" 5/16" - 24 UNF 6.90 I 7/16" - 14 UNC 9.65 U 3/8" - 24 UNF 8.50 Q
Similarly different thread sizes and types, such as UNC, UNF, and NPT, have different requirements for tap drill sizes. A tap drill size chart is an invaluable resource for anyone working with standard threads and can save time and frustration by providing the 5/16-18 #11 (.193) 5/16-24 #10 (.205) 3/8-16 #9 (.254) 3/8-24 #8 (.257) 7/16
16x 2 14 18 x 2 16 2" x 4-1/2 1-25/32" 45.2 1-3/4 x 12 1-43/64” 42.4 18 x 2.5 15.5 20 x 1 19 2" x 12 1-59/64” 48.8 20 x 2.5 17.5 20 x 1.5 18.5 22 x 2.5 19.5 20 x 2 18 24 x 3 21 22 x 1 21
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Ingeneral, tap tool life can be increased significantly by using a lower percent of thread and we suggest using values between 60% and 70% for most applications. Thread strength is not directly proportional to percent of thread. For example a 100% thread specification is only 5% stronger than a 75% thread specification but requires 3 times the Belowis a comprehensive drill and tap size chart for all drills and taps, imperial and metric, up to 36.5 millimetres (1.44 in) in diameter. In manufactured parts, holes with female screw threads are often needed; they accept male screws to facilitate the building and fastening of a finished assembly. 9 ⁄ 16-18 0.56250 in 87 M14×1.5 drillsize for 7/16 unf tap can someone confirm that i have the right size drill bit for a 7/16 unf tap i found this link and it says i need a 9.9mm drill bit, is this correct Posts 11442 Registered 18/1/04 Location 1 Member Is Offline Photo Archive Building: Horsepower. posted on 7/2/06 at 08:53 PM: Yep. 9.90mm (0.3898" ) according the the PlZ3.
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    • 9 16 18 unf tap drill size