1、_ SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising there
2、from, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2015 SAE International All rights reserved. No part of this p
3、ublication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-497
4、0 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/AS71051B AEROSPACESTANDARDAS71051 REV B. Issued 1999-06 Revised 2008-03 Reaffirme
5、d 2015-07 Superseding AS71051A Pipe Threads, Taper, Aeronautical National Form, Symbol ANPT - Design and Inspection Standard RATIONALE AS71051B has been reaffirmed to comply with the SAE five-year review policy. 1. SCOPE This document establishes the requirements for Aeronautical National Form (ANPT
6、) pipe threads, gages, and gaging methods for determining conformity of aeronautical taper pipe threads to this standard. 1.1 Purpose Threads and gages covered by this standard are intended for use on pipe, plugs, fittings, and similar devices in aeronautical components and equipment requiring a sea
7、led thread joint, and where straight threads and gaskets or O-rings are inadequate. 2. REFERENCES 2.1 Applicable Documents The following publications form a part of this document to the extent specified herein. The latest issue of SAE publications shall apply. The applicable issue of other publicati
8、ons shall be the issue in effect on the date of the purchase order. In the event of conflict between the text of this document and references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exem
9、ption has been obtained. 2.1.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. AS5200 Port or Fitting End, Internal Taper Pipe Thread, Design Standard AS5201 Fi
10、tting End, External Taper Pipe Thread, Design Standard SAE INTERNATIONAL AS71051B Page 2 of 27 2.1.2 ASME Publications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASME B46.1 Surface Texture (Surface Rough
11、ness, Waviness, and Lay) 2.1.3 U.S. Government Publications Available from Document Automation and Production Service (DAPS), Building 4/D, 700 Robbins Avenue, Philadelphia, PA 19111-5094, Tel: 215-697-6257, http:/assist.daps.dla.mil/quicksearch. MIL-G-10944 Gages, Dimensional Control 3. REQUIREMENT
12、S 3.1 Form of Thread The Aeronautical National Taper Pipe Thread Form, Symbol ANPT, as shown on Figure 1, shall be used for taper pipe threads covered by this standard. 3.2 Dimensions Taper pipe threads shall conform to dimensions as shown on Figure 2 and given in Tables 1 and 2, and shall be full p
13、rofile within the L2and L1+ L3lengths. The crest and root of the thread shall be truncated within the limits specified in Table 1, and as shown on Figure 3. This applies to fully machined fittings and bosses and not to fittings made from nominal size pipe stock. 3.2.1 Tolerance The tolerance for all
14、 taper pipe threads shall be plus or minus one turn (length of one pitch - hereafter “pitch”) on the inspection gage checked over the basic effective length of thread. External threads that are one turn under basic and internal threads that are one turn over basic shall be of correct form for not le
15、ss than one pitch in excess of the respective L2and L1+ L3lengths. 3.2.2 Thread Angle The thread angle, when measured in the axial plane, shall be such that its bisector will be perpendicular to the axis of the thread. Half of the thread angle shall be 30 1 for all pitches with the exception of the
16、11-1/2 and 8 pitch threads, which shall be within 45 minutes. 3.2.3 Lead of Thread The tolerance on lead (pitch and helix) between any two pitches within the effective thread lengths L2and L1+ L3shall be the basic pitch within .002 inch. 3.2.4 Taper of Thread The taper of the thread shall be 3/4 inc
17、h per foot, 1/16 inch, when measured on the diameter and along the axis. 3.2.5 Internal Threads The entrance end of internal threads shall be countersunk 90 to the diameter given in Table 1. SAE INTERNATIONAL AS71051B Page 3 of 27 FIGURE 1 - AERONAUTICAL NATIONAL TAPER PIPE THREAD FORM AND NOTATION
18、TABLE 1 - COUNTERSINKING, CHAMFERING, AND LIMITS ON CREST AND ROOT TRUNCATION 1)TABLE 1A - DIMENSIONS 1-6 Truncation Minimum Maximum Nominal Pipe Size Inch Threads per Inch Formula Inch Formula Inch 1 2 3 4 5 6 1/16 1/8 1/4 3/8 1/2 3/4 1 1 1/4 1 1/2 2 2 1/2 3 27 27 18 18 14 14 11-1/2 11-1/2 11-1/2 1
19、1-1/2 8 8 .033P .033P .033P .033P .033P .033P .033P .033P .033P .033P .033P .033P .0012 .0012 .0018 .0018 .0024 .0024 .0029 .0029 .0029 .0029 .0041 .0041 .096P .096P .088P .088P .078P .078P .073P .073P .073P .073P .062P .062P .0036 .0036 .0049 .0049 .0056 .0056 .0063 .0063 .0063 .0063 .0078 .0078 SA
20、E INTERNATIONAL AS71051B Page 4 of 27 TABLE 1B - DIMENSIONS 7-12 Width of Flat Nominal Pipe Size Minimum Maximum Chamfer J 2)X 45 Approx Countersink Diameter K 3)X 90 5 Inch Formula Inch Formula Inch InchInch JK +.03 .00 1 7 8 9 10 11 12 1/16 1/8 1/4 3/8 1/2 3/4 1 1 1/4 1 1/2 2 2 1/2 3 .038P .038P .
21、038P .038P .038P .038P .038P .038P .038P .038P .038P .038P .0014 .0014 .0021 .0021 .0027 .0027 .0033 .0033 .0033 .0033 .0048 .0048 .111P .111P .102P .102P .090P .090P .084P .084P .084P .084P .072P .072P .0041 .0041 .0057 .0057 .0064 .0064 .0073 .0073 .0073 .0073 .0090 .0090 .03-.05 .03-.05 .04-.07 .
22、04-.07 .05-.08 .05-.08 .06-.09 .06-.09 .06-.09 .06-.09 .08-.11 .08-.11 .312 .406 .562 .687 .875 1.062 1.312 1.641 1.906 2.500 2.906 3.531 1)See 3.2.7. 2)J - External Threads. 3)K - Internal Threads. SAE INTERNATIONAL AS71051B Page 5 of 27 FIGURE 2 - AERONAUTICAL NATIONAL TAPER PIPE THREAD DIMENSIONS
23、 TABLE 2 - DIMENSIONS OF AERONAUTICAL NATIONAL TAPER PIPE THREADS TABLE 2A - DIMENSIONS N - L3Basic Lengths Nominal Pipe Size Inch Threads per Inch n Pitch n1= p Inch Depth of Thread h, Max Inch D Inch L1Inch L2Inch (L1+ L3) Inch 1 2 3 4 5 6 7 8 1/16 1/8 1/4 3/8 1/2 3/4 1 1 1/4 1 1/2 2 2 1/2 3 27 27
24、 18 18 14 14 11-1/2 11-1/2 11-1/2 11-1/2 8 8 .03704 .03704 .05556 .05556 .07143 .07143 .08696 .08696 .08696 .08696 .12500 .12500 .02963 .02963 .04444 .04444 .05714 .05714 .06957 .06957 .06957 .06957 .10000 .10000 .3125 .405 .540 .675 .840 1.050 1.315 1.660 1.900 2.375 2.875 3.500 .160 .1615 .2278 .2
25、40 .320 .339 .400 .420 .420 .436 .682 .766 .26111 .26385 .40178 .40778 .53371 .54571 .68278 .70678 .72348 .75652 1.13750 1.20000 .27111 .27261 .39447 .40667 .53429 .55329 .66087 .68087 .68087 .69687 1.05700 1.14100 SAE INTERNATIONAL AS71051B Page 6 of 27 TABLE 2B - DIMENSIONS E0- E3Basic Pitch Diame
26、ters Nominal Pipe Size Inch E0Inch E1Inch E2Inch E3Inch 1 9 10 11 12 1/16 1/8 1/4 3/8 1/2 3/4 1 1 1/4 1 1/2 2 2 1/2 3 .27118 .36351 .47739 .61201 .75843 .96768 1.21363 1.55713 1.79609 2.26902 2.71953 3.34062 .28118 .37360 .49163 .62701 .77843 .98887 1.23863 1.58338 1.82234 2.29627 2.76216 3.38850 .2
27、8750 .38000 .50250 .63750 .79179 1.00179 1.25630 1.60130 1.84130 2.31630 2.79062 3.41562 .26424 .35656 .46697 .60160 .74504 .95429 1.19733 1.54083 1.77978 2.25272 2.69609 3.31719 NOTE: For selection of tap drills and taper pipe reamers, subtract the depth “h” from the pitch diameter at E1. SAE INTER
28、NATIONAL AS71051B Page 7 of 27 FIGURE 3 - CREST AND ROOT TRUNCATION TOLERANCE ZONES SAE INTERNATIONAL AS71051B Page 8 of 27 3.2.6 External Threads The entering end of external threads shall be chamfered 45 to the distance given in Table 1. 3.2.7 Thread Bosses Externally pipe threaded bosses shall co
29、nform to the dimensions shown on AS5201, and internally pipe threaded bosses shall conform to the dimensions shown on AS5200. 3.2.8 Gages Gages for checking pipe threads shall be in accordance with the requirements of this standard and MIL-G-10944. 3.2.9 Marking Gages fabricated in conformance to th
30、is standard shall be plainly and permanently marked with “AS71051” to denote compliance with the aeronautical pipe thread requirements of this standard. Additional markings shall be applied as specified on gage drawings, or in the order or invitation for bids. 3.3 Formulae and Constants The constant
31、s for six step plug and ring gages are given in Table 3. The formulae for six step plug and ring gages are as follows: Taper Plugs Formulae: D = Minor diameter at E3with max truncation = E3* - Col 4 of Table 3 Bt= L1+ L3* B = Bt- (Length equivalent of max truncation - min truncation) = Bt- Col 5 of
32、Table 3 MN = B - Col 3 of Table 3 (one turn) MNt= Bt- Col 3 of Table 3 MX = B + Col 3 of Table 3 MXt= Bt+ Col 3 of Table 3 Taper Rings Formulae: D = Major diameter at E2with max truncation = E2* + Col 4 of Table 3 Bt= L2* B = Bt- (Length equivalent of max truncation - min truncation) = Bt- Col 5 of
33、Table 3 MN = B + Col 3 of Table 3 MNt= Bt+ Col 3 of Table 3 MX = B - Col 3 of Table 3 MXt= Bt- Col 3 of Table 3 *Product figured to 5 significant decimal places SAE INTERNATIONAL AS71051B Page 9 of 27 TABLE 3 - CONSTANTS FOR SIX STEP PLUG AND RING GAGES Threads per Inch Constant Max Trunc One Turn L
34、ength One Pitch Twice the Addendum at Maximum Trunc Length Equivalent of Max Trunc - Min Trunc 1 2 3 4 1) 5 2) 27 18 14 11-1/2 8 .096 .088 .078 .073 .062 .03704 .05556 .07143 .08696 .12500 .02496 .03833 .05072 .06261 .09275 .07467 .09778 .10286 .11130 .11600 1)Sharp “V” thread depth - 2 (max truncat
35、ion) nx2866025.)n()x(2n866025. = where: x = maximum truncation constant 2)Length equivalent = 32 (max truncation - min truncation) = 32 )n()yx( where: x = maximum truncation constant y = minimum truncation constant = .033 3.4 Workmanship Workmanship shall be consistent with the tolerances herein spe
36、cified. The threads shall be free from flaws, blow holes, abrupt terminations and other defects which would make them unsuitable for the purpose intended. Unless otherwise specified, the surface texture of the thread flanks and the roots shall be no greater than 100 in Ra in accordance with ASME B46
37、.1. 4. INSPECTION PROVISIONS 4.1 Gages Pipe threads shall be checked with gages that conform to Tables 4 and 5 and Figures 4, 5, and 6. The gages shall be subject to certification by a Government agency at the discretion of either the procuring activity or the Government inspector. SAE INTERNATIONAL
38、 AS71051B Page 10 of 27 TABLE 4 - BASIC DIMENSIONS OF THREADED PLUG AND RING GAGES FOR AERONAUTICAL NATIONAL TAPER PIPE THREADS TABLE 4A - DIMENSION 1 - 9 Major Diameter of Plug Gages Pitch Diameter of Plug and Ring Gages Nominal Pipe Size Inch Threads per Inch n Pitch P Inch At small end of L11) In
39、ch At gaging notch of L1 1)Inch At small end of master L22)Inch Small end of ring gages or L1 plug gages, E0Inch At gaging notch L1 plug gagesor at largeend of thinring gage, E1Inch At large end, full ring, E2Inch 1 2 3 4 5 6 7 8 9 1/16 1/8 1/4 3/8 1/2 3/4 1 1 1/4 1 1/2 2 2 1/2 3 27 27 18 18 14 14 1
40、1-1/2 11-1/2 11-1/2 11-1/2 8 8 .03704 .03704 .05556 .05556 .07143 .07143 .08696 .08696 .08696 .08696 .12500 .12500 .29614 .38847 .51572 .65035 .80914 1.01839 1.27624 1.61974 1.85870 2.33163 2.81228 3.43338 .30614 .39856 .52996 .66535 .82914 1.03958 1.30124 1.64599 1.88495 2.35888 2.85491 3.48125 .30
41、081 .39314 .52183 .65645 .81557 1.02482 1.28320 1.62670 1.86566 2.33859 2.81953 3.44062 .27118 .36351 .47739 .61201 .75843 .96768 1.21363 1.55713 1.79609 2.26902 2.71953 3.34062 .28118 .37360 .49163 .62701 .77843 .98887 1.23863 1.58338 1.82234 2.29627 2.76216 3.38850 .28750 .38000 .50250 .63750 .791
42、79 1.00179 1.25630 1.60130 1.84130 2.31630 2.79062 3.41562 1)These dimensions are based on gage truncation formulas that are the same as column 5 of Table 1. 2)Major diameter of master thread setting plug gages to be truncated .033p. SAE INTERNATIONAL AS71051B Page 11 of 27 TABLE 4B - DIMENSIONS 10
43、- 16 Minor Diameter of Ring Gages Thin Ring 1)Full Ring 2)Nominal Pipe Size Inch At small end Inch At large end Inch At small end InchAt large end InchIncrease in diameter per threadInch Thickness of thin ring, L1Inch Thickness of full ring,L2Inch 1 10 11 12 13 14 15 16 1/16 1/8 1/4 3/8 1/2 3/4 1 1
44、1/4 1 1/2 2 2 1/2 3 .25022 .34255 .44594 .58057 .71800 .92725 1.16441 1.50791 1.74687 2.21980 2.64878 3.26987 .26022 .35264 .46018 .59557 .73800 .94844 1.18941 1.53416 1.77312 2.24705 2.69141 3.31775 .24622 .33855 .43906 .57368 .70771 .91696 1.15102 1.49452 1.73348 2.20641 2.62678 3.24787 .26254 .35
45、504 .46417 .59917 .74107 .95107 1.19370 1.53870 1.77870 2.25370 2.69787 3.32287 .00231 .00231 .00347 .00347 .00446 .00446 .00543 .00543 .00543 .00543 .00781 .00781 .160 .1615 .2278 .240 .320 .339 .400 .420 .420 .436 .682 .766 .26111 .26385 .40178 .40778 .53371 .54571 .68278 .70678 .72348 .75652 1.13
46、750 1.20000 1)L1ring gages are to be truncated .15p. 2)These dimensions are based on gage truncation formulas that are the same as column 5 of Table 1. SAE INTERNATIONAL AS71051B Page 12 of 27 TABLE 5 - TOLERANCES OF AERONAUTICAL NATIONAL TAPER PIPE THREAD PLUG AND RING GAGES Nominal Pipe Size Inch
47、Threads per Inch n Tolerance on pitch diameter including taper 1) 2)Inch Tolerance on lead 3)Inch Toleranceon half angle (plus andminus) 4)minutesToleranceon majordiameterof plug gage (minus) InchToleranceon minordiameterof ring gage (plus) InchTotal cumulative tolerances on pitch diameter InchMaxim
48、umlongitudinalvariation from basicfor plug orring gageInchMaximumstand-offbetweenplug andring gages atgaging notch when screwedtogethertightly byhand 5)Inch 1 2 3 4 5 6 7 8 9 10 1/16 1/8 1/4 3/8 1/2 3/4 1 1 1/4 1 1/2 2 2 1/2 3 27 27 18 18 14 14 11-1/2 11-1/2 11-1/2 11-1/2 8 8 .0002 .0002 .0003 .0003
49、 .0003 .0003 .0003 .0003 .0003 .0003 .0004 .0004 .0002 .0002 .0002 .0002 .0002 .0002 .0003 .0003 .0003 .0003 .0004 .0004 20 20 15 15 13 13 10 10 10 10 5 5 .0005 .0005 .0005 .0005 .0005 .0005 .0005 .0005 .0005 .0005 .0005 .0005 .0005 .0005 .0005 .0005 .0005 .0005 .0005 .0005 .0005 .0005 .0005 .0005 .00088 .00088 .00102 .00102 .00107 .00107 .00121 .00121 .00121 .00121 .00137 .00137 .0141 .0141 .0163 .0163 .0171 .0171 .0194 .01
