Общий каталог OSG 2018 - 2019 - страница 670

General Pipe Threads American National General Pipe Threads (Table 357) Crest and root limits for American National Standard External and Internal Taper Pipe Thread (NPT) H HeightSharp VThreadsThreadPer Inch(inch)HeightPipeThreadMax(inch)Truncation(inch)EquivalentWidth of Flat(inch) H h Min Max. Min. Max. h 27 0.03208 0.02963 0.0012 0.0036 0.0014 0.0041 18 0.04811 0.04444 0.0018 0.0049 0.0021 0.0057 14 0.06186 0.05714 0.0024 0.0056 0.0027 0.0064 11 1/2 0.07531 0.06957 0.0029 0.0063 0.0033 0.0073 8 0.10825 0.10000 0.0041 0.0078 0.0048 0.0090 The limits specified above are intended to serve as a guide for establishing limits for the thread elements of taps, dies, and thread chasers. These limits may be required on the product. For complete specifications see latest edition of USE Standard B2.1. The Military Aeronautical Specification MIL-P- 7105 agrees with all values given in this table. Dryseal American National Standard Pipe Threads Crest and root limits for Dryseal American National Standard External and Internal Pipe Threads (NPTF) Height Sharp V Truncation Equivalent Width Threads Per Thread (inch) of Flat (inch) Inch (inch) H Min Max. Min. Max. 27 CrestRoot0.03208 0.0017 0.00350.00350.0052 0.00200.00400.00400.0060 18 CrestRoot0.04811 0.00260.00430.00430.0061 0.00300.00500.00500.0070 14 CrestRoot0.06186 0.00260.00430.00430.0061 0.00300.00500.00500.0070 11 1/2 CrestRoot0.07531 0.00350.00520.00520.0078 0.00400.00600.00600.0090 8 CrestRoot0.10825 0.00520.00690.00690.0095 0.00600.00800.00800.0110 The major diameter of standard taper pipe plug gages and the minor diameter of standard taper pipe ring gages used for gaging dryseal threads will be truncated .20p minimum to .25p maximum for all pitches. 670 Threading Technical WWW.OSGTOOL.COM