PIPE TAPS
	NPT & NPTF
Nominal Size	Without Reamer	With Reamer	NPSM	NPSC	NPSF
1/16.27	C (0.242)	A (0.234)	.	1/4	D (0.246)
1/8.27	Q (0.332)	21/64	T (0.358)	Q (0.332)	R (0.339)
1/4.18	7/16	27/64	15/32	7/16	7/16
3/8.18	9/16	9/16	0.603 (special)	37/64	37/64
1/2.14	45/64	11/16	19.0mm	23/32	0.705 (special)
3/4.14	29/32	57/64	61/64	59/64	59/64
1-111.2	19.64	11.8	113.64	15.32	15.32
11.4.111.2	131.64	115.32	135.64	11.2	-
11.2.111.2	123.32	145.64	125.32	147.64	-
2.111.2	23.16	211.64	21.4	21.4	-

TAP TYPES Spiral Point Gun® Taps An angular point shears and shoots chips out ahead of the tap which eliminates the flutes from clogging. For use in through holes and holes two diameters deeper than the required thread length. Spiral Flute Taps Lifting action removes chips from threaded hole. For use in blind hole tapping. Hand Taps Have straight flutes and are used for hand and machine threading. HAND AND GUN® TAPS – INCH Tap Size & Pitch Pitch Series Drill Size Decimal Equivalent Machine Screw Threads 0-80 NF 3/64 0.0469 1-64 NC 53 0.0595 1-72 NF 53 0.0595 2-56 NC 50 0.0700 2-64 NF 50 0.0700 3-48 NC 47 0.0785 3-56 NF 46 0.0810 4-40 NC-UNC 43 0.0890 4-48 NF 42 0.0935 5-40 NC 38 0.1015 5-44 NF 37 0.1040 6-32 NC-UNC 36 0.1065 6-40 NF 33 0.1130 8-32 NC-UNC 29 0.1360 8-36 NF 29 0.1360 10-24 NC-UNC 26 0.1470 10-32 NF-UNF 21 0.1590 12-24 NC 16 0.1770 12-28 NF-UNF 15 0.180 Tap Size & Pitch Drill Size Decimal Equivalent National & Unified Coarse Threads 1/4-20 7 0.2010 5/16-18 F 0.2570 3/8-16 5/16 0.3125 7/16-14 U 0.3680 1/2-13 27/64 0.4219 9/16-12 31/64 0.4844 5/8-11 17/32 0.5312 3/4-10 21/32 0.6562 7/8-9 49/64 0.7656 1-8 7/8 0.8750 11.8-7 63/64 0.9844 11.4-7 1 7/64 1.1094 13.8-6 1 7/32 1.2188 11.2-6 1 11/32 1.3438 13.4-5 1 9/16 1.5630 2-41.2 1 25/32 1.7810 National & Unified Fine Threads 1/4-28 3 0.2130 5/16-24 I 0.2720 3/8-24 Q 0.3320 7/16-20 25/64 0.3906 1/2-20 29/64 0.4531 9/16-18 33/64 0.5156 5/8-18 37/64 0.5781 3/4-16 11/16 0.6875 7/8-14 13/16 0.8125 1-12 59/64 0.9219 11.8-12 1-3/64 1.0469 11.4-12 1-11/64 1.1719 13.8-12 1-19/64 1.2969 11.2-12 1-27/64 1.4219 National Special 1-14 15/16 0.9380

Pipe Taps Used for internal threading of pipes, pipe fittings, and holes. MATERIALS AND SURFACE COATINGS/TREATMENTS Carbon Steel Ideal for jobs that do not require the accuracy of high speed steel taps or heat and abrasion resistance, such as some hand tapping applications. Not designed to cut new threads. High Speed Steel Use for a variety of applications on ferrous and nonferrous materials. Adds abrasion and heat resistance for longer tap life. Better chip removal and coolant flow with closer tolerance pitch diameter size. Steam Oxide Coated Steam oxide treatment provides increased lubricity and is applied primarily to prevent galling and loading in steels. Ideal for tapping a variety of ferrous materials. TiN Coated Titanium nitride coating improves tap life and may be used for faster cutting speeds. For use with a variety of ferrous and nonferrous materials. HAND AND GUN® TAPS – METRIC Tap Size & Pitch Drill Size Decimal Equivalent M1.6 x 0.35 1.25 0.0492 M1.8 x 0.35 1.45 0.0571 M2 x 0.40 1.6 0.0630 M2.2 x 0.45 1.75 0.0689 M2.5 x 0.45 2.05 0.0807 M3 x 0.50 2.5 0.0984 M3.5 x 0.60 2.9 0.1142 M4 x 0.70 3.3 0.1299 M4.5 x 0.75 3.7 0.1457 M5 x 0.80 4.2 0.1654 M6 x 1.00 5 0.1969 M7 x 1.00 6 0.2362 M8 x 1.25 6.7 0.2638 M8 x 1.00 7 0.2756 M10 x 1.50 8.5 0.3346 M10 x 1.25 8.7 0.3425 M12 x 1.75 10.2 0.4016 M12 x 1.25 10.8 0.4252 M14 x 2.00 12 0.4724 M16 x 2.00 14 0.5512 M16 x 1.50 14.5 0.5709 M18 x 2.50 15.5 0.6102 M18 x 1.50 16.5 0.6496 M20 x 2.50 17.5 0.6890 M20 x 1.50 18.5 0.7283 M22 x 2.50 19.5 0.7677 M22 x 1.50 20.5 0.8071 M24 x 3.00 21 0.8268 M24 x 2.00 22 0.8661 M27 x 3.00 24 0.9449 M27 x 2.00 25 0.9843 M30 x 3.50 26.5 1.0433 M30 x 2.00 28 1.1024 M33 x 3.50 29.5 1.1614 M33 x 2.00 31 1.2205 M36 x 4.00 32 1.2598 M36 x 3.00 33 1.2992 M39 x 4.00 35 1.3780 M39 x 3.00 36 1.4173

TiCN Coated Titanium carbonitride coating enables higher tapping speeds, increased tool life, and high wear resistance in abrasive materials. Appropriate for a variety of ferrous materials. TiAlN Coated Addition of aluminum reduces friction and increases the coating oxidation temperature, resulting in increased resistance to heat and oxidation wear. Suited for high speed/high heat applications. Modified TiAlN Coated Modified coating designed for increased resistance to heat and oxidation wear compared to standard TiAlN. CrN Coated Extremely high surface lubricity makes this coating ideal for nonferrous materials. Aluminum and copper alloys tend to adhere to tool when heat is generated; this coating negates the effects of heat by reducing the amount of friction caused when these materials are being machined, while adding increased hardness. FIREX® Coated Multi-layer TiN/TiAlN PVD coating designed for drill surface hardness to over 90 Rc. Offers the application versatility of TiN, the heat resistance of TiAlN, and the shock resistance of TiCN. CHAMFERS Reduced thread height at the front of tap which guides tap into hole. Taper Has 7 to 10 chamfered threads. Commonly used in through holes. Plug Has 3 to 5 chamfered threads. For use in through holes and blind holes with adequate space for chips to accumulate. Bottoming Has 1 to 2 chamfered threads. For use in threading near the bottom of a blind hole. Modified Bottom Has 2.5 to 3 chamfered threads. For use in through holes and blind holes. THREAD TYPES NF — American National Fine Thread Series NC — American National Coarse Thread Series UNC — Unified Coarse Thread Series UNF — Unified Fine Thread Series UNS — Unified Thread Special PITCH DIAMETER LIMITS A letter followed by a number which shows the tolerance of pitch diameter over the basic pitch diameter. H1 +0.0005" H2 +0.0005" to +0.0010" H3 +0.0010" to +0.0015" H4 +0.0015" to +0.0020" H5 +0.0020" to +0.0025" H6 +0.0025" to +0.0030" H7 +0.0030" to +0.0035"