THREAD/SCREW - Drill & Tap Chart

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Melvin Dickerson
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1 Machine Screw THREAD/SCREW Drill & Tap Chart Threads Per Inch Min Dia Alum, Brass, & Plasitcs 75% Thread Tap Drills Stainless Steel, Steels & Iron 50% Thread Clearance Hole Drills Close Fit All Materials Free Fit # Dia Maj Dia Drill Decimal Equiv. Drill Decimal Equiv. Drill Decimal Equiv. Drill Decimal Equiv / / / / / F.2570 H / F.2570 J / I / P.3230 Q / L / Q / Q.3320 S.3480 W.3860 X / T U / / / / / / Y.4040 Z / / / / / / / / / / / / / / / /

2 / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / /

3 Tap size NF/NC UNF/UNC Tap Chart UNC/UNF Threads Threads per inch Basic maj dia (inches) Basic effective dia (inches) Basic min dia of ext. threads (inches) Basic min dia of int. threads (inches) Drill size 080 UNF / UNC # UNC # UNF # UNC # UNF # UNC # UNF # UNC # UNF # UNC # UNF # UNC # UNF #21 1/420 UNC #7 1/428 UNF #3 5/1618 UNC F 5/1624 UNF I 3/816 UNC /16 3/824 UNF Q 7/1614 UNC U 7/1620 UNF /64 1/213 UNC /64 1/220 UNF /64 9/1612 UNC /64 9/1618 UNF /64 5/811 UNC /32 5/818 UNF /64 3/410 UNC /32 3/416 UNF /16 7/89 UNC /64 7/814 UNF /16 18 UNC /8 114 UNF /16 1 1/87 UNC /64 1 1/812 UNF /64 1 1/47 UNC /64 1 3/86 UNC /64 1 1/26 UNC /32 1 3/45 UNC / UNC 4 1/ /32

4 British Association Thread Chart Thread Angle 47.5 Degrees No Decimal TPI Pitch Ce Dia Thread Radius Hex A/Flats Tapping MM Letter Number / /

5 OD Decimal TPI Pitch Ce Dia British Standard Whitwth Thread Chart Thread Angle 55 degrees Thread Radius Hex A/Flats Head Washer Face Dia Standard Lock Tapping 1/ / / / / / / / E 3/ /16 MM Letter Number 7/ /64 1/ Z 9/ /64 5/ /32 11/ /32 3/ /64 13/ /32 7/ /4 15/ / /64 1 1/ /32 1 1/ /32 1 3/ /8 1 1/ /16

6 OD Decimal TPI Pitch Ce Dia Thread Radius Hex A/Flats Head Washer Face Dia Standard Lock Tapping MM Letter Number 1 3/ /32 1 7/ / /4 Model Engineers Thread Chart Thread Angle 55 degrees OD Decimal TPI Pitch Ce Dia Thread Tapping MM Letter Number 1/ /32 5/ / / / / / F 9/ D 5/ L 5/ J 3/ S 3/ R 7/ Z 7/ Y 1/ /32 1/ /32

7 Metric Threads Coarse Thread Pitches 1. F metric threads pitch is the distance between threads. 1 mm ~= inches Nominal Diameter Pitch 1 Clearance Drill Tap Drill M M M M M M M M M M M M M M M M M M M M M M M M

8 Metric Threads Fine Thread Pitches Nominal Diameter Pitch ) Tap Drill M 1.0x M 1.1x M 1.2x M 1.4z M 1.6x M 1.8x M 2x M 2.2x M 2.5x M 3x M 3.5x M 4x M 4.5x M 5x M 5.5x M 6x M 7x M 8x M 8x M 9x M 9x M 10x M 10x M 10x M 11x M 11x M 12x M 12x M 12x M 14x M 14x M 14x M 15x M 15x M 16x M 16x M 17x M 17x

9 Nominal Diameter Pitch ) Tap Drill M 18x M 18x M 18x M 20x M 20x M 20x M 22x M 22x M 22x M 24x M 24x M 24x M 25x M 25x M 25x M 27x M 27x M 27x M 28x M 28x M 28x M 30x M 30x M 30x M 30x M 32x M 32x M 33x M 33x M 33x M 35x M 35x M 36x M 36x M 36x M 39x M 39x M 39x M 40x

10 Nominal Diameter Pitch ) Tap Drill M 40x M 40x M 42x M 42x M 42x M 42x M 45x M 45x M 45x M 45x M 48x M 48x M 48x M 48x M 50x M 50x M 50x M 52x M 52x M 52x M 52x M 55x M 55x M 55x M 55x M 56x M 56x M 56x M 56x M 58x M 58x M 58x M 58x M 60x M 60x M 60x M 60x M 62x M 62x

11 Nominal Diameter Pitch ) Tap Drill M 62x M 62x M 64x M 64x M 64x M 64x M 65x M 65x M 65x M 65x M 68x M 68x M 68x M 68x M 70x M 70x M 70x M 70x M 70x M 72x M 72x M 72x M 72x M 72x M 75x M 75x M 75x M 75x M 75x M 76x M 76x M 76x M 76x M 76x M 80x M 80x M 80x M 80x M 80x

12 Nominal Diameter Pitch ) M 85x M 85x M 85x M 85x M 90x M 90x M 90x M 90x M 95x M 95x M 95x M 95x M 100x M 100x M 100x M 100x Tap Drill

13 BSF Thread s Diameter O.Diameter Ce Pitch Radius Effective T.P.I. 3/ / / / / / / / / / / / / / / / / / / /

14 BSCCEI Threads OD Decimal TPI Pitch Ce Dia 17 swg RH swg RH swg RH swg RH Thread Radius Hex A/Flats Head Washer Face Dia Standard Lock Tapping swg RH swg RH swg RH /8 RH swg RH swg RH /32 RH swg RH swg RH MM Letter Number / /16 1/16 52

15 OD Decimal TPI Pitch Ce Dia Thread Radius Hex A/Flats Head Washer Face Dia Standard Lock Tapping 3/16 RH /32 7/32 RH /4 RH /64 RH /32 RH C 5/16 RH J 3/8 RH R 7/16 RH X 7/16 RH W 1/2 RH /32 1/2 RH /64 9/16 RH /32 9/16 RH /64 5/8 RH /32 5/8 RH /64 11/16 RH /32 11/16 RH /64 3/4 RH /32 3/4 RH /64 7/8 RH /32 31/32 RH /16 1 inch RH MM Letter Number 1 1/8 RH /32 31/32

16 OD Decimal TPI Pitch Ce Dia Thread Radius Hex A/Flats Head Washer Face Dia Standard Lock Tapping 1.29 LH /4 MM Letter Number 1 3/8 RH /64 1 3/8 LH RH / LH /64 1 9/16 LH /32 1 5/8 RH /32

BSPT & BSPP threads BSP is BRITISH STANDARD PIPE BSPT is BRITISH STANDARD PIPE TAPER BSPP is BRITISH STANDARD PIPE PARALLEL Also known as Whitwth 55 Thread Fm Thread fm per AS 1722.

17 BSPT & BSPP threads BSP is BRITISH STANDARD PIPE BSPT is BRITISH STANDARD PIPE TAPER BSPP is BRITISH STANDARD PIPE PARALLEL Also known as Whitwth 55 Thread Fm Thread fm per AS , BS 21, ISO 7 Thread fm per AS , ISO 228 BSPT male threads seal against threads of fixed BSPT female. Contact is made on the flanks of the threads. Use of a thread sealant is recommended f BSPT male to BSPT female connections. Measure the BSPT male thread OD and female thread ID at the first full thread near the end of the fitting. BSPT male and BSPP male with conical 30 seat (60 included angle) seal against matching conical 30 seat of BSPP female swivel. BSPP O Ring male connect has straight threads and O Ring with metal Retaining Ring. It seals against flat external surface of BSPP female pt. BSPP male, with chamfer to locate Bonded Seal also seals against flat external surface of BSPP female pt. Surface irregularities require a Spot Face to ensure effective sealing. Elbows and tees have Lock to allow ientation of fitting to required direction. BSPP male and BSPP female flat face swivel require a suitable soft washer between faces to seal. F low wking pressure.

18 Trade Threads per inch Thread Charts Pitch Maj Diameter Min Diameter Gage Length Inch mm Inch mm Inch Mm Inch mm 1/ / / / / ¼ ½ ½ NPT NPT stands f National Pipe Thread and is an American standard thread. It may also be reffered to as MPT, MNPT NPT (M) f male external threads and FPT, FNPT NPT(F) f female interal threads. A thread sealant must always be used to achieve a leak free seal (except f NPTF). It is also based on Trade rather than actual diameter (similar to BSP in this regard). Both threads have the same pitch, angle (60 degrees) and shape (flat peaks and valleys). Trade Threads per Pitch Maj Diameter (O.D) inch Inch mm Inch mm 1/ / / / / ½ ¼ 11 ½ ½ 11 ½ ½ ½

19 BSP vs NPT NPT threads are common in the United States and a few other countries, BSP threads are widely used in many other countries. BSPT British Standard Pipe Taper BSPP British Standard Pipe Parallel NPT National Pipe Taper NPS National Pipe Straight While the actual specified outside diameters of American National Pipe differ slightly from those of British Standard Pipe, either thread may reliably be cut onto a pipe of its respective trade size. BSPT equivalent is NPT and BSPP s equivalent is NPS. Never swap threads if it is a high pressure application. NPT/NPS and BSP threads are not compatible due to the differences in their thread fms, and not just the fact that most sizes have a different pitch. NPT/NPS threads have a 60 angle and have flattened peaks and valleys (Sellers thread fm) where as BSP threads have a 55 angle and have rounded peaks and valleys (Whitwth thread fm). NPT and BSP thread pitches (threads per inch) are listed below. To determine pitch, use a thread gauge count the number of threads that fall into a 1" span. Trade Pitch (Threads per Inch) NPT/NPS BSP 1/ / / / ¾ ½ 11 1 ¼ 11 ½ 11 1 ½ 11 ½ ½ 11 2 ½ ½

FITTING IDENTIFICATION AMERICANT THREAD TYPES APPENDIX ALFAGOMMA // APPENDIX. Dash numers. NPTF (National Pipe Tapered Fuel)

FITTING IDENTIFICATION AMERICANT THREAD TYPES APPENDIX ALFAGOMMA // APPENDIX. Dash numers. NPTF (National Pipe Tapered Fuel) // FITTINGS GUIDelines FITTING IDENTIFICATION numers Most fluid piping system sizes are measured by dash numbers. These are universally used abbreviations for the size of component expressed as the numerator