taps: pitch diameter limit for internal screw...

314 Tap Technical Taps: Pitch Diameter Limit Pitch Diam. Limits Maximum Pitch Diam. Limits Maximum Pitch Diam. Limits Maximum Pitch Diam. Limits Maximum All Classes Minimum Basic Pitch Diameter Threads Per Inch Unified Classes of Thread American National Classes of Thread ISO Metric Class of Threads Size mm Pitch mm NC UNC NF UNF Rec.* Taps Rec.* Taps Rec.* Taps Rec.* Taps CLASS 2B For General Applications CLASS 6H For Commercial Threads CLASS 3B For Closer Fits CLASS 2 CLASS 3 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H2 H3 H2 H3 H2 H3 H3 H3 H3 H5 H4 H5 H4 H5 H4 H5 H5 H5 H5 H5 H5 H5 H5 H5 H5 H6 H6 H6 H6 H6 H8 H6 H8 H6 H8 H6 H8 H6 0 1 1 2 2 3 3 4 4 5 5 6 6 8 8 10 10 12 12 1/4 1/4 5/16 5/16 3/8 3/8 7/16 7/16 1/2 1/2 9/16 9/16 5/8 5/8 3/4 3/4 7/8 7/8 1 1 1 1-1/8 1-1/8 1-1/4 1-1/4 1-3/8 1-3/8 1-1/2 1-1/2 — 64 — 56 — 48 — 40 — 40 — 32 — 32 — 24 — 24 — 20 — 18 — 16 — 14 — 13 — 12 — 11 — 10 — 9 — 8 — — 7 — 7 — 6 — 6 — 80 — 72 — 64 — 56 — 48 — 44 — 40 — 36 — 32 — 28 — 28 — 24 — 24 — 20 — 20 — 18 — 18 — 16 — 14 — 12 14NS — 12 — 12 — 12 — 12 0.0519 0.0629 0.0640 0.0744 0.0759 0.0855 0.0874 0.0958 0.0985 0.1088 0.1102 0.1177 0.1218 0.1437 0.1460 0.1629 0.1697 0.1889 0.1928 0.2175 0.2268 0.2764 0.2854 0.3344 0.3479 0.3911 0.4050 0.4500 0.4675 0.5084 0.5264 0.5660 0.5889 0.6850 0.7094 0.8028 0.8286 0.9188 0.9459 0.9536 1.0322 1.0709 1.1572 1.1959 1.2667 1.3209 1.3917 1.4459 0.0542 0.0655 0.0665 0.0772 0.0786 0.0885 0.0902 0.0991 0.1016 0.1121 0.1134 0.1214 0.1252 0.1475 0.1496 0.1672 0.1736 0.1933 0.1970 0.2224 0.2311 0.2817 0.2902 0.3401 0.3528 0.3972 0.4104 0.4565 0.4731 0.5152 0.5323 0.5732 0.5949 0.6927 0.7159 0.8110 0.8356 0.9276 0.9535 0.9609 1.0416 1.0787 1.1668 1.2039 1.2771 1.3291 1.4022 1.4542 0.0536 0.0648 0.0659 0.0765 0.0779 0.0877 0.0895 0.0982 0.1008 0.1113 0.1126 0.1204 0.1243 0.1465 0.1487 0.1661 0.1726 0.1922 0.1959 0.2211 0.2300 0.2803 0.2890 0.3387 0.3516 0.3957 0.4091 0.4548 0.4717 0.5135 0.5308 0.5714 0.5934 0.6907 0.7143 0.8089 0.8339 0.9254 0.9516 0.9590 1.0393 1.0768 1.1644 1.2019 1.2745 1.3270 1.3996 1.4522 H1 H1 H1 H1 H1 H1 H1 H2 H1 H2 H1 H2 H2 H2 H2 H3 H2 H3 H3 H3 H3 H3 H3 H3 H3 H3 H3 H3 H3 H3 H3 H3 H3 H5 H3 H4 H4 H4 H4 H4 H4 H4 H4 H4 H4 H4 H4 H4 0.0536 0.0648 0.0658 0.0764 0.0778 0.0877 0.0894 0.0982 0.1007 0.1112 0.1125 0.1204 0.1242 0.1464 0.1485 0.1662 0.1724 0.1922 0.1959 0.2211 0.2299 0.2805 0.2887 0.3389 0.3512 0.3960 0.4086 0.4552 0.4711 0.5140 0.5305 0.5719 0.5930 0.6914 0.7139 0.8098 0.8335 0.9264 0.9515 0.9585 1.0407 1.0765 1.1657 1.2015 1.2768 1.3265 1.4018 1.4515 H1 H1 H1 H1 H1 H1 H1 H2 H1 H2 H1 H2 H2 H2 H2 H3 H2 H3 H3 H3 H3 H3 H3 H3 H3 H5 H3 H5 H3 H5 H3 H5 H3 H5 H3 H6 H4 H4 H4 H4 H4 H4 H4 H4 H4 H4 H4 H4 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H1 H2 H1 H2 H1 H2 H1 H3 H1 H3 H1 H3 H2 H3 H2 H3 H2 H4 H2 H4 H4 H4 H4 H4 H4 H4 H4 H4 H4 H4 0.0532 0.0643 0.0653 0.0759 0.0773 0.0871 0.0889 0.0975 0.1001 0.1105 0.1118 0.1196 0.1235 0.1456 0.1478 0.1653 0.1716 0.1913 0.1950 0.2201 0.2290 0.2794 0.2878 0.3376 0.3503 0.3947 0.4076 0.4537 0.4701 0.5124 0.5294 0.5702 0.5919 0.6895 0.7126 0.8077 0.8322 0.9242 0.9499 0.9572 1.0381 1.0749 1.1631 1.1999 1.2738 1.3249 1.3988 1.4499 0.35 0.4 0.45 0.5 0.6 0.7 0.8 1.0 1.25 1.5 1.75 2.0 2.0 2.5 3.0 3.5 4.0 M1.6 M2 M2.5 M3 M3.5 M4 M5 M6 M8 M10 M12 M14 M16 M20 M24 M30 M36 0.0541 0.0686 0.0870 0.1054 0.1225 0.1396 0.1764 0.2107 0.2830 0.3554 0.4277 0.5001 0.5788 0.7235 0.8682 1.0917 1.3151 0.0574 0.0720 0.0906 0.1092 0.1268 0.1442 0.1812 0.2165 0.2892 0.3624 0.4355 0.5083 0.5871 0.7322 0.8785 1.1026 1.3268 D3 D3 D3 D3 D4 D4 D4 D5 D5 D6 D6 D7 D7 D7 D8 D9 D9 FOR INTERNAL SCREW THREAD CLASSES AND TAP RECOMMENDATIONS *Basic Pitch Diameter: NOTE: P .D. Limits for recommended taps: D3 = Basic Plus 0.0009" to Basic Plus 0.0015" D4 = Basic Plus 0.0012" to Basic Plus 0.002" D5 = Basic Plus 0.0015" to Basic Plus 0.0025" D6 = Basic Plus 0.0018" to Basic Plus 0.003" D7 = Basic Plus 0.0019" to Basic Plus 0.0035" D8 = Basic Plus 0.0024" to Basic Plus 0.004" D9 = Basic Plus 0.0025" to Basic Plus 0.0045" The above recommended taps normally produce the class of thread indicated in average materi- als when used with reasonable care. However, if the tap specified does not give a satisfactory gage fit in the work, a choice of some other limit tap may be necessary. **Sizes through 1" diameter: H1 = Basic to Basic Plus 0.0005" H2 = Basic Plus 0.0005" to Basic Plus 0.0010" H3 = Basic Plus 0.0010" to Basic Plus 0.0015" H4 = Basic Plus 0.0015" to Basic Plus 0.0020" H5 = Basic Plus 0.0020" to Basic Plus 0.0025 H6 = Basic Plus 0.0025" to Basic Plus 0.0030" Sizes larger than 1" diameter through 1-1/2" H4 = Basic Plus 0.0010" to Basic Plus 0.0020" Pitch Diameter Limits-Inches Min. Max. Rec. Taps Size WWW.OSGTOOL.COM 800.837.2223

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Page 1: Taps: Pitch Diameter Limit FOR INTERNAL SCREW …osgtooling.com.au/.../2014/05/Imperial-ISO-Tap-tolerance-chart.pdffits class 2 class 3 h2 h2 h2 h2 h2 h2 h2 h2 h2 h2 h2 h3 h2 h3 h2

314

Tap

Tech

nica

lTaps: Pitch Diameter Limit

Pitch Diam.Limits

Maximum

Pitch Diam.Limits

Maximum

Pitch Diam.Limits

Maximum

Pitch Diam.Limits

Maximum

AllClasses

Minimum

BasicPitch

Diameter

ThreadsPer Inch

UnifiedClasses of Thread

American NationalClasses of Thread

ISO MetricClass of Threads

Sizemm

Pitchmm

NCUNC

NFUNF

Rec.*Taps

CLASS 2BFor

GeneralApplications

CLASS 6HFor

Commercial Threads

CLASS 3BFor

Closer Fits

CLASS 2 CLASS 3

H2H2H2H2H2H2H2H2H2H2H2H3H2H3H2H3H3H3H3H5H4H5H4H5H4H5H5H5H5H5H5H5H5H5H5H6H6H6H6H6H8H6H8H6H8H6H8H6

011223344556688101012121/41/45/165/163/83/87/167/161/21/29/169/165/85/83/43/47/87/8111

1-1/81-1/81-1/41-1/41-3/81-3/81-1/21-1/2

—64—56—48—40—40—32—32—24—24—20—18—16—14—13—12—11—10—9—8——7—7—6—6—

80—72—64—56—48—44—40—36—32—28—28—24—24—20—20—18—18—16—14—12

14NS—12—12—12—12

0.05190.06290.06400.07440.07590.08550.08740.09580.09850.10880.11020.11770.12180.14370.14600.16290.16970.18890.19280.21750.22680.27640.28540.33440.34790.39110.40500.45000.46750.50840.52640.56600.58890.68500.70940.80280.82860.91880.94590.95361.03221.07091.15721.19591.26671.32091.39171.4459

0.05420.06550.06650.07720.07860.08850.09020.09910.10160.11210.11340.12140.12520.14750.14960.16720.17360.19330.19700.22240.23110.28170.29020.34010.35280.39720.41040.45650.47310.51520.53230.57320.59490.69270.71590.81100.83560.92760.95350.96091.04161.07871.16681.20391.27711.32911.40221.4542

0.05360.06480.06590.07650.07790.08770.08950.09820.10080.11130.11260.12040.12430.14650.14870.16610.17260.19220.19590.22110.23000.28030.28900.33870.35160.39570.40910.45480.47170.51350.53080.57140.59340.69070.71430.80890.83390.92540.95160.95901.03931.07681.16441.20191.27451.32701.39961.4522

H1H1H1H1H1H1H1H2H1H2H1H2H2H2H2H3H2H3H3H3H3H3H3H3H3H3H3H3H3H3H3H3H3H5H3H4H4H4H4H4H4H4H4H4H4H4H4H4

0.05360.06480.06580.07640.07780.08770.08940.09820.10070.11120.11250.12040.12420.14640.14850.16620.17240.19220.19590.22110.22990.28050.28870.33890.35120.39600.40860.45520.47110.51400.53050.57190.59300.69140.71390.80980.83350.92640.95150.95851.04071.07651.16571.20151.27681.32651.40181.4515

H1H1H1H1H1H1H1H2H1H2H1H2H2H2H2H3H2H3H3H3H3H3H3H3H3H5H3H5H3H5H3H5H3H5H3H6H4H4H4H4H4H4H4H4H4H4H4H4

H1H1H1H1H1H1H1H1H1H1H1H1H1H1H1H1H1H1H1H2H1H2H1H2H1H3H1H3H1H3H2H3H2H3H2H4H2H4H4H4H4H4H4H4H4H4H4H4

0.05320.06430.06530.07590.07730.08710.08890.09750.10010.11050.11180.11960.12350.14560.14780.16530.17160.19130.19500.22010.22900.27940.28780.33760.35030.39470.40760.45370.47010.51240.52940.57020.59190.68950.71260.80770.83220.92420.94990.95721.03811.07491.16311.19991.27381.32491.39881.4499

0.350.40.450.50.60.70.81.01.251.51.752.02.02.53.03.54.0

M1.6M2

M2.5M3

M3.5M4M5M6M8M10M12M14M16M20M24M30M36

0.05410.06860.08700.10540.12250.13960.17640.21070.28300.35540.42770.50010.57880.72350.86821.09171.3151

0.05740.07200.09060.10920.12680.14420.18120.21650.28920.36240.43550.50830.58710.73220.87851.10261.3268

D3D3D3D3D4D4D4D5D5D6D6D7D7D7D8D9D9

FOR INTERNAL SCREW THREAD CLASSES AND TAP RECOMMENDATIONS

*Basic Pitch Diameter:

NOTE: P.D. Limits for recommended taps:D3 = Basic Plus 0.0009" to Basic Plus 0.0015"D4 = Basic Plus 0.0012" to Basic Plus 0.002"D5 = Basic Plus 0.0015" to Basic Plus 0.0025"D6 = Basic Plus 0.0018" to Basic Plus 0.003"D7 = Basic Plus 0.0019" to Basic Plus 0.0035"D8 = Basic Plus 0.0024" to Basic Plus 0.004"D9 = Basic Plus 0.0025" to Basic Plus 0.0045"

The above recommended taps normally producethe class of thread indicated in average materi-als when used with reasonable care. However,if the tap specified does not give a satisfactorygage fit in the work, a choice of some other limittap may be necessary.

**Sizes through 1" diameter:H1 = Basic to Basic Plus 0.0005"H2 = Basic Plus 0.0005" to Basic Plus 0.0010"H3 = Basic Plus 0.0010" to Basic Plus 0.0015"H4 = Basic Plus 0.0015" to Basic Plus 0.0020"H5 = Basic Plus 0.0020" to Basic Plus 0.0025H6 = Basic Plus 0.0025" to Basic Plus 0.0030"Sizes larger than 1" diameter through 1-1/2"H4 = Basic Plus 0.0010" to Basic Plus 0.0020"

Pitch DiameterLimits-Inches

Min. Max.

Rec.Taps

Size

WWW.OSGTOOL.COM 800.837.2223

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