916˝ – 18 12,9 5/8˝ – 18 14,5 3/4˝ – 16 17,5 7/8˝ – 14 20,5 1˝ – 12 23,25 1 1/8˝ – 12 26,5 TAPPING DRILL SIZES MF P Ø UNF: Unified fine thread UNF ANSI B 1.1 G: Whitworth pipe thread DIN ISO 228 Ø: Core hole diameter W 1/16˝ 1,2
UNFBRITISH STANDARD FINE (55º) UNIFIED NATIONAL FINE (60º) #3 (.099) 56 2.1 5/16 18 6.5 3/8 16 7.9 7/16 14 9.3 1/2 12 10.5 9/16 12 12.1 5/8 11 13.5 3/4 10 16.25 7/8 9 19.25 1 8 22.0 16 (55º) Tap Size TPI Drill Only* Drill & Reamer Rc 1/16 28 6.4 6.2 Rc 1/8 28 8.4 8.4 Rc 1/4 19 11.2 10.8
TheUnified Thread Standard (UTS) defines a standard thread form and series—along with allowances, tolerances, and designations—for screw threads commonly used in the United States and Canada.It is the main standard for bolts, nuts, and a wide variety of other threaded fasteners used in these countries. It has the same 60° profile as the ISO metric
TapDrill Sizes for 15/16 - 16 16-UN. If not specified, assume a thread depth of 75%. You can learn more about thread depth in tapping here. To get the tap drill size in other depths, use our Tap Drill Size Calculator . Thread Depth Tap Drill Size (Inch) (UNC/UNF/UNEF) National Pipe (NPT) Dryseal Pipe (BPTF) British Pipe (BSP) ACME
TapDrill Charts | National Pipe Threads NPT & NPTF NPS & NPSF Pipe Tap Size Pitch (TPI) Drill Size* (inch) Pitch (TPI) Drill Size (inch) 1/16 27 0.242 (C) - - 1/8 27 0.332 (Q) 27 0.348 (S) 1/4 18 7/16 18 29/64 3/8 18 9/16 18 19/32 1/2 14 45/64 14 47/64 3/4 14 29/32 14 15/16 1 11-1/2 1-9/64 11-1/2 1-3/16 1-1/4 11-1/2 1-31/64 11-1/2 1-33/64
916-12-UNC: 31/64.4844: 9/16-18-UNF: 33/64.5156: What size hole do I drill for a 1/2 inch tap? Nominal Size (inches) T P I Tapping Drill Size; 1/2: 14: 18.25mm: How do you determine the drill size for a tapped hole? As a rule of thumb, for Metric threads, the tapping drill can be calculated by subtracting the pitch from the diameter of
\n \n 9 16 18 unf tap drill size
. 264 260 210 121 12 93 214 239 163

9 16 18 unf tap drill size