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Threading TablesC:\British Cars\Tech Papers\Thread Sizes\Threading Tables.docSource: hart No 1 - Whitworth ThreadsWhitworth Form Threads (55 Deg Thread Angle)Dimensions in Inches except where statedThread Form DataDiameter ping DrillClearance DrillDec / Met / FracDec / Met / 04 - 2.55mm0.1299 - .1457 - 3.70mm0.1968 - 2008 - 5.10mm0.2559 - .2559 - 6.50mm0.3150 - 3125 - 5/16"0.3858 - .3642 - 9.25mm0.4531 - 4134 - 10.50mm0.5156 - .4764 - 12.10mm0.5781 - 5315 - 13.50mm0.6406 - 6406 - 41/64"0.7656 - 579 - 19.25mm0.8906 - 1 - 22.00mm1.0156 - 0.9744 - 24.75mm1.1405 - 1.0938 - 1-3/32"1.2656 - 61.3189 - 33.50mm1.5156 - 51.5354 - 39.00mm1.8906 - .7520 - 44.50mm2.0156 - 2-1/64"1
Chart No 2 - British Standard Fine (BSF) ThreadsBritish Standard Fine Threads (55 Deg Thread Angle)Dimensions in Inches except where statedThread Form DataDiameter O/DiameterCorePitchDepth RadiusTapping DrillClearance DrillEffectiveDiaT.P.IDec / Met / FracDec / Met / Frac3/16"0.18750.14750.0312 0.02000.00460.1675320.1562 - 5/32"0.1929 - 4.90mm7/32"0.21880.17300.0357 0.02290.00490.1958280.1831 - 4.65mm0.2205 - 5.60mm1/4"0.25000.20080.0385 0.02460.00530.2254260.2087 - 5.30mm0.2559 - 6.50mm5/16"0.31250.25430.0454 0.02910.00620.2834220.2657 - 6.75mm0.3150 - 8.00mm3/8"0.37500.31100.0500 0.03200.00690.3430200.3248 - 8.25mm0.3858 - 9.80mm7/16"0.43750.36630.0555 0.03560.00760.4019180.3819 - 9.70mm0.4531 - 29/64"1/2"0.50000.42000.0625 0.04000.00860.4600160.4375 - 7/16"0.5156 - 35/64"9/16"0.56250.48250.0625 0.04000.00860.5225160.5000 - 1/2"0.5781 - 37/64"5/8"0.62500.53360.0714 0.04570.00980.5793140.5512 - 14.00mm0.6406 - 41/64"3/4"0.75000.64320.0833 0.05340.01140.6966120.6594 - 16.75mm0.7656 - 49/64"7/8"0.87500.75860.0909 0.05820.01250.8168110.7812 - 25/32"0.8906 - 57/64"1"1.00000.87200.1000 0.06400.01370.9360100.8957 - 22.75mm1.0156 - 1-1/64"1-1/8"1.12500.98280.1111 0.07110.01531.053991.0039 - 25.50mm1.1406 - 1-9/64"1-1/4"1.25001.10780.1111 0.07110.01531.178991.1319 - 28.751.2656 - 1-17/64"1-3/8"1.37501.21500.1250 0.08000.01721.295081.2402 - 31.501.3906 - 1-25/64"1-1/2"1.50001.34000.1250 0.08000.01721.420081.3594 - 1-23/64"1.5156 - 1-33/64"1-5/8"1.62501.46490.1250 429 0.09150.01961.658571-19/32"--2"2.00001.81700.1429 66 6 6 0.10670.02292.643362-9/16"--3"3.00002.74390.2000 0.12800.02752.871952-3/4"--2
Chart No 3- British Association (BA) ThreadsBritish Association ThreadsDimensions in Inches except where statedThread Form DataTapping DrillClearance DrillSize O/DiameterCorePitchDepthRadiusEffectiveDiaT.P.IDec / Met / FracDec / Met / Frac0BA0.23620.18900.03940.02360.0072--25.380.2008 - 5.10mm0.2362 - 72 - 4.50mm0.2126 - 75 - 4.00mm0.1890 - 58 - 3.45mm0.1645 - 81 - 3.00mm0.1457 - 43 - 2.65mm0.1299 - 06 - 2.30mm0.1122 - 07 - 2.05mm0.1004 - 09 - 1.80mm0.0886 - 10 - 1.55mm0.0768 - 551 - 1.40mm0.0709 - 472 - 1.20mm0.0591 - 413 - 1.05mm0.0512 - 1.30mmChart No 4 - British Standard Pipe ThreadsBSP ThreadsDimensions in Inches except where statedThread Form DataDiameter O/DiameterTapping DrillClearance DrillCorePitchDepthRadiusEffectiveDiaT.P.IDec / Met / FracDec / Met / 45 - 8.75mm0.3858 - 4646 - 11.80mm0.5312 - 6004 - 15.25mm0.6719 - 7500 - 3/4"0.8281 - 8281 - 53/64"0.9062 - 9646 - 24.50mm1.0469 - .1122 - 28.25mm1.2031 - 2106 - 30.75mm1.3125 - 11.5551 - 39.50mm1.6562 - 111.7812 - 1-25/32"1.8906 - 112.0079 - 51.00mm2.1250 - 00 - 2-1/4"2.3594 - 2-23/64"3
Chart No 5 - SI Metric Threads (60 Deg Angle)SI Metric Threads (60 Deg Angle)-Dimensions in Millimetres - Inch table belowThread Form DataDiameter O/DiameterTapping DrillCorePitchDepthFlatEffective mmClearance DrillDec / Met / Frac Dec / Met / .00mm2.598mm0.500mm36.402mm6.3535.00mm1-35/64"SI Metric Threads (60 Deg Angle)6.10mm- Dimensions in Inches - Metric table aboveThread Form DataTapping DrillClearance DrillDiameterO/DiameterCorePitchDepthFlatEffective DiaT.P.IDec / Met / Frac Dec / Met / .3780"1.5469"4
Chart No 7 - Cycle Engineer's Standard ThreadsCycle Engineer's Standard Threads (60 Deg)Dimensions in Inches except where statedThread Form e DiaT.P.ITapping Drill17 IWG**0.0560.03880.0026870.00860.016130.047462No 6116 IWG0.0640.04680.0026870.00860.016130.0554623/64"15 IWG0.0720.05480.0026870.00860.016130.063462No 5414 3 IWG0.0920.07300.0029820.00950.01790.082556No 4912 IWG0.1040.07980.003780.01210.02270.091944No 0.154"0.1540.12740.0041650.01330.02500.140740No "1/4"0.2500.20900.0064140.02050.03850.229526No 40.266"0.2660.22500.0064140.02050.03850.245526No *IWG Imperial Wire Gauge Wire gauge sizes are for spokes, larger sizes for hubs and pedals5
Chart No 8 - Model Engineer's and Admiralty Fine ThreadsModel Engineer's Standard Threads (Whitworth Form)Dimensions in Inches except where statedThread Form DataDiameter O/DiameterCoreRadiusDepthPitchEffective DiaT.P.ITapping Drill1/8"0.1250.0930--0.01600.02500.109040No 405/32"0.15630.1242--0.01600.02500.140340No --0.02000.031250.261332Letter C5/16"0.31250.2725--0.02000.031250.292532Letter J3/8"0.3750.3350--0.02000.031250.355032Letter .50000.4508--0.02460.038460.47542629/64"Admiralty Fine Threads (Whitworth Form)Dimensions in Inches except where statedThread Form hEffective DiaT.P.ITapping DrillUnder 1/2"N/AN/AN/A0.02670.04166N/A24N/A1/2" & under 3/4"N/AN/AN/A0.03200.05000N/A20N/A3/4" & under 1"N/AN/AN/A0.04570.07143N/A14N/A1" & under 2"N/AN/AN/A0.05330.08333N/A12N/A2" & under 4"N/AN/AN/A0.08000.12500N/A8N/A4" & overN/AN/AN/A0.10670.16666N/A6N/AUsed on pressure gauges and screwed glands on engines etc.6
Chart No 10 - Small Whitworth ThreadsSmall Whitworth Form Threads (55 Deg Thread Angle)Dimensions in Inches except where statedThread Form DataDiameterTapping DrillO/DiameterCorePitchDepthRadiusEffective DiaT.P.IDec / Met / Frac1/16"0.06250.04110.016660.0107--0.051860No 32"0.093750.06700.020830.01334--0.080448No 487/64"0.109380.08270.020830.01334--0.096048No 441/8"0.125000.09290.025000.01605--0.108540No 409/64"0.140630.10860.025000.01601--0.124640No 335/32"0.156250.11620.031250.02003--0.136232No 3111/64"0.171880.13190.031250.01999--0.151932No 293/16"0.187500.13410.041660.0267--0.160824No 64"0.234380.18110.041660.02664--0.2077243/16"Chart No 6 - 'Continental' Whitworth Threads'Continental' Whitworth Form Threads (55 Deg Thread Angle)Thread Form e 180.03922.79583½7
Chart No 12 - Copper Tube ThreadsCopper Tube Screw Threads (Whitworth Form 55 Deg Thread Angle)Dimensions in Inches except where statedThread Form DataTapping HoleI/DiameterGauge O/DCorePitchDepthRadiusEffective DiaT.P.IDec / Met / Frac1/8" Inside0.2480.2020.03570.0230--0.225028Number 41/4" Inside0.3890.3250.05000.0320--0.357020Letter Q3/8" Inside0.5140.4500.05000.0320--0.48202015/32"1/2" Inside0.6390.5750.05000.0320--0.60702015mm5/8" Inside0.7640.7000.05000.0320--0.73202023/32"3/4" Inside0.8890.8250.05000.0320--0.85702027/32"7/8" Inside1.1040.9500.05000.0320--1.07202024.50mm1" Inside1.1551.0910.05000.0320--1.12302026mm1-1/4" " 4" Inside1.9291.8490.06250.0400--1.8890161-55/64"2" Inside2.1792.0990.06250.0400--2.139162.125"2-1/4" " Inside2.6792.5990.06250.0400--2.639162-5/8"2-3/4" Inside2.9292.8490.06250.0400--2.8890162-55/64"3" Inside3.2033.1230.06250.0400--3.1630163"Chart No 13 - Brass Pipe ThreadsBrass Pipe Screw Threads (Whitworth Form 55 Deg Thread Angle)Dimensions in Inches except where statedThread Form DataTapping HoleDiameterO/DCorePitchDepthRadiusEffective DiaT.P.IDec / Met / Frac1/8"0.1250.07570.038460.0246--0.102026Number 471/4"0.2500.20070.038460.0246--0.225426Number 63
SI Metric Threads (60 Deg Angle) - Dimensions in Millimetres - Inch table below. Thread Form Data Tapping Drill Clearance Drill Diameter O/Diameter Core Pitch Depth Flat Effective Dia T.P.I Dec / Met / Frac Dec / Met / Frac. 6mm 6.00mm 4.70mm 1.00mm File Size: 1MBPage Count: 22
