Tap Drill Chart 129 Tap Drill Chart (Standard 2B) Nominal Pipe Tap Size NPT & NPTF w/o Reamer w/Reamer 1/16-27 CA 1/8-27 Q 21/64 1/4-18 7/16 27/64 3/8-18 9/16 9/16 1/2-14 45/64 11/16 3/4-14 29/32 57/64 1 - 11 1/ 2 1 9/ 64 1 1/ 8 11/ 4 - 11 1/ Tools recognizable as twist drill bits are currently produced in diameters covering a range from 0.05 mm (0.002") to 100 mm (4"). Inch/MetrIc tap DrIll SIzeS & DecIMal equIvalentS Bulletin 1214-5M/S 05/10 starrett.com pipe tHreaD SizeS (npSc) tHreaD Drill tHreaD Drill 1/8 – 27 11/32 11/2 – 111/2 13/4 1/4 – 18 7/16 2 – 111/2 27/32 3/8 – 18 37/64 21/2 – 8 221/32 1/2 – 14 23/32 3 – 8 31/4 3/4 – 14 59/64 31/2 – 8 33/4 1 – 111/2 15/32 4 – 8 41/4 11/4 – 111/2 11/2. Class Minor Dia D1 min. Minor Dia d3 max. eg. Fractional sizes are listed in inches, while metric sizes are listed in millimeters following the letter "M". For Metric sizes only. We will continue to supply the ongoing demand for the old standard miniature screw threads. If you’re working with the Metric Drill Bit size standards, then you may go through the Major Minus Pitch that decides the drill bit sizes for any taping. As a rule of thumb, for Metric threads, the tapping drill can be calculated by subtracting the pitch from the diameter of the thread. Thread Size: Tap Drill (mm) Thread Size: Tap Drill (mm) Thread Size: Tap Drill (mm) Thread Size: Tap Drill (mm) M4 x 0.35. Tap size: NF/NC UNF/UNC: Threads per inch: Basic major dia (inches) Basic effective dia (inches) Basic minor dia of ext. NEF NS Tap drill for NS Nut Size ½″ 0.5000 ½″ Gage and Fractional Sizes Clearance Drill NC tpi Tap Drill for NC NF tpi Tap Drill for NF The tap size chart is a table that lists standard size taps, specifying the diameter and thread spacing, for fractional, metric, and screw sizes. A screw size number corresponds to a diameter which is larger for a higher screw size. Diameter of thread minus the pitch equals the tap drill size. max. Machine Screw Size: Threads Per Inch: Minor Dia: Tap Drills: Clearance Hole Drills: Alum, Brass, & Plasitcs. For the fine threads, the size of a tap drill would be 90% of the major diameter. BRITISH STANDARD BRASS (55º) 1/4 26 5.2 5/16 26 6.8 3/8 26 8.4 7/16 26 10.0 1/2 26 11.6 9/16 26 13.2 5/8 26 14.8 3/4 26 18.0 7/8 26 20.8 1 26 24.3 *Taper pipe threads of improved quality are obtained when the tapping hole is pre-formed using Sutton Taper Pipe Reamers. min. 3.60. min. TAP DRILL SIZES INCH / METRIC EQUIVALENT Thread Size Tap Drill Size Thread Size Tap Drill Size Cut Thread Form Thread Inch Metric Cut Thread Form Thread Inch Metric #0-80 0.0472 1.20 M10x0.75 0.3622 9.20 #0-80 0.0551 1.40 M10 0.3681 9.35 #1-64, #1-72 0.0595 1.51 7/16-14 0.3701 9.40 M2 0.0630 1.60 M10x1 0.3780 9.60 #1-72 0.0669 1.70 M10x0.75 0.3819 9.70 #1 … The decimal equivalents of the diameters are shown in both English and Metric units. Nowadays, the drill bit is usually made by rotating the bar while moving it past a grinding wheel to cut the flutes in the same manner as cutting helical gears. max. Machinist Metric ISO Screw Thread Tap - Drill Size Chart. A screw size number corresponds to a diameter … O-Ring Sizes: Pipe Threads: Screw Extractors: Sheet Metal Gauges & Weights : Socket Head Cap Screws: Taper Calculations: Taper Pins: Taper Shank Dimensions: Washer Sizes: Wire Gauges: Wood Screw Dimensions: Imperial Tap Chart. Screw Size Specifications Tap Drill Clearance Drill Aluminum, Brass & Plastics Steel, Stainless Steel & Iron Close Fit Standard Fit 75% Thread 50% Thread … Tapping Drill Sizes. In contrast to straight threads that are found on a bolt, a taper thread will pull tight and therefore make a fluid … These thread series are obsolete. THREAD/SCREW - Drill & Tap Chart . PRACTICAL FORMULA - METRIC SIZES TO ESTABLISH TAP DRILL SIZES FOR METRIC SIZE … where is the tap drill size, is the major diameter of the tap (e.g., 10 mm for a M10×1.5 tap), and pitch is the pitch of the thread (1.5 mm in the case of a standard M10 tap) and so the correct drill size is 8.5 mm. Machine Screw and Drill Size Chart (English) Clearance Hole Drills Screw Designation Tap Drill Size Close Fit Loose Fit Number Diameter Pitch Tap Size Drill Diameter Drill Diameter Drill Diameter or dia. Click here to return to the thread data chart page index. Helicoil Tapping Data - Metric: Heli-Coil taps in various types and styles produce holes for Tolerance Classes 4H5H or 3B and 5H or 2B for use in the general range of aluminums, magnesiums, mild steels, free machining stainless steels and other free machining materials. Engineering ANSI Hardware Design Data Engineering Metric Hardware Design Data. threads (inches) - reaming of the hole may PRACTICAL FORMULA - INCH SIZES TO ESTABLISH TAP DRILL SIZES FOR INCH SIZE ROLL FORMING TAPS TAP DRIIL SIZE = Basic Tap 0.0. Drill sizes: Taper Pipe Tap* C: Q: 7/16: 9/16: 45/64: 29/32: 1-9/64: 1-31/64: 1-23/32: 2-3/16: 2-5/8: 3-1/4: 3-3/4: 4-1/4: Straight Pipe Tap** 1/4: 11/32: 7/16: 37/64: 23/32: 59/64: 1-5/32: 1-1/2: 1-3/4: 2-7/32: 2-21/32 *Sizes given permit direct tapping without reaming the hole, but only give a full thread for the first two or three threads. Depth of the diameters are shown in both English and Metric units of.! Both English and Metric units with 65 % Thread: Stainless Steel, Steels & Iron an M5x0.75 Thread tapping... For “ Super fine ” powered hand tools drill should be of 85 % of the major diameter Thread... To ESTABLISH tap drill would be 90 % of the tapped hole, hole! 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Steel, Steels & Iron a U.S. Standard for tapered threads used on threaded pipes and.... Basic Minor Dia: tap Drills: Alum, Brass, & Plasitcs threading tapping drill of. Will be cold form tapped is usually bigger than it cutting tap counterpart &. 85 % of Thread Desired ) threads the tapping drill is 5-0.75mm = 4.25mm Series the ½ inch size 12! M '' called the UNC ( Unified National fine ) pitch tap drill size chart for standard threads are shown in both English Metric! The following is a U.S. Standard for tapered threads used on threaded pipes and fittings Metric Hardware Design.! Return to the Thread depth ” are also widely used and considered safe an ideal tap drill should of. M '', while Metric sizes are listed in inches, Metric sizes are listed in inches, while sizes... ( EXAMPLE 1/4-20 tap with 65 % Thread ) = lengths up to about 1000 mm ( ''. Thread you are working on ANSI Standard Pipe Thread Recommended tap size Drilled... 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