Общий каталог OSG 2018 - 2019 - страница 667

Taper Pipe Taps Taper Pipe Taps Ground Thread (Table 338) American National Standard Taper Pipe Thread Form (NPT) Aeronautical National Taper Pipe Thread Form (ANPT) Dryseal American National Standard Taper Pipe Thread Form (NPTF) Thread Limits Width of Flats - Taps NominalSize (inch)Threadsper InchNPT*Gage Measurement(inch)ProjectionTolerance(+/-)Taper per Foot(inch)Min.Max.Width of Flats at Tap Crest and RootsThreadsPer InchElementNPTNPTFMin.Max.Min.Max. 1/16 27 0.312 1/16 23/32 25/321/8270.3121/1623/3225/321/4180.4591/1623/3225/323/8180.4541/1623/3225/321/2140.5791/1623/3225/323/4140.5651/1623/3225/32111-1/20.6783/3223/3225/321 1/411-1/20.6863/3223/3225/321 1/211-1/20.6993/3223/3225/32211-1/20.6673/3223/3225/3227Major Dia.Minor Dia.0.0014.0041.00410.0040.0055.004018Major Dia.Minor Dia.0.0021.0057.00570.0050.0065.005014Major Dia.Minor Dia.0.0027.0064.00640.0050.0065.005011 1/2Major Dia.Minor Dia.0.0033.0073.00730.0060.0083.00608Major Dia.Minor Dia.0.0048.0090.00900.0080.0103.0030 2 1/2 8 0.925 3/32 47/64 25/32 3 8 0.925 3/32 47/64 25/32 Minimum minor diameter flats are not specified. May be as sharp as 3 1/24 88 0.9380.950 1/81/8 47/64 25/3247/6425/32 practicable. Ground Thread Taps marked NPT may be used for NPT andANPT applications. *Distance small end of tap projects through an L1 American Standard Taper Pipe Thread Ring Gage (See Table 357 page 668). LEAD TOLERANCE A maximum lead deviation of ±.0005” within any two threads not farther apart than one inch is permitted. Angle Tolerance FORMULA FOR AMERICAN NATIONAL STANDARD PIPE FORM Minimum major diameter = Measured pitch diameter +A. Threads Per Inch Tolerance Half Angle Maximum major diameter = Measured pitch diameter +B. 8 ±25’ Minimum minor diameter = Measured pitch diameter -B. 11-1/2 to 27 inclusive ±30’ Maximum minor diameter = Measured pitch diameter -C. Formula Values FORMULA FOR DRYSEAL AMERICAN NATIONAL STANDARD PIPE FORM ThreadsPer InchA B C D E Minimum major diameter = Measured pitch diameter +D.Maximum major diameter = Measured pitch diameter +E. 27 0.0267 0.0296 0.0257 0.0234 0.0251 Minimum minor diameter = Maximum or smaller. 18 0.0408 0.0444 0.0401 0.0377 0.0395 Maximum minor diameter = Measured pitch diameter -E. 14 0.0535 0.0571 0.0525 0.0515 0.0533 11 1/2 0.0658 0.0696 0.0647 0.0614 0.0649 8 0.0966 0.1000 0.0946 For essential dimensions of American National Standard Pipe Threads (See Table 357 page 440). Ground Thread American Standard Pipe Form Taps made to this table are to be marked NPT. Ground Thread Dryseal American National Standard Pipe Taps made to this table are to be marked NPTF. Ground Thread Taps, Aeronautical National Thread Form, made to this table are marked ANPT. WWW.OSGTOOL.COM Threading Technical 667