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 reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2009 SAE International All rights reserved. No part of this publication m
3、ay 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: 724-776-4970 (outside USA)
4、 Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SURFACEVEHICLE STANDARD J2271 MAY2009 Issued 1996-06 Revised 2009-05Superseding J2271 JAN2009 Ship Systems and EquipmentPart Standard for Studs Continuous and Double End (Inch Series) RATIONALE This limited scope rev
5、ision only makes editorial changes and clarifications as to the scope of the document. Technical requirements are not changed. Changes are made to 1.1.b and 1.1.c to indicate that different thread forms can be used on each end of the stud. Changes in the January 2009 revision of this standard are li
6、sted below. Configuration changes include: Added UNRF thread configurations for diameters 0.190 inch to 1-1/2 inches. Expanded the size (diameter) range of UNRC and 8UN studs. Added NC-5 HF and NC-5 CSF interference threads for use where a larger diameter is required for interference fit in an overs
7、ize tapped hole. Added ONF interference fit threads in Appendix B. The constant strength (undersize) stud body has been deleted in favor of the more commonly used reduced diameter body. Added Full Diameter Body configuration. The tap end thread length dimensions have been revised to minimize variati
8、ons in thread length. Due to configuration changes, the Part Identification Number System has been revised and all part numbers are different from earlier revisions. Added Appendix A to provide guidance on the selection and installation of NC-5 Interference-Fit Tap End Studs. Materials added and oth
9、er material changes are: Titanium alloy 32 (Ti-5-1-1-1) to ASTM F 468. Ni-Cr-Mo-Cb (UNS N06625) to ASTM F 468 for high temperature and seawater applications. Ni-Cr-Mo-W alloy (UNS N06686) to ASTM F 468. Stainless steel B8 and B8M to ASTM A 193. Stainless steel 300 series per ASTM F 593 Group 1. Carb
10、on Steel Grade B per ASTM A 307. Carbon and Alloy Steels - SAE J429 Grades 2, 5 and 8 (Grade 5 replaces ASTM A 449 Type 1 and Grade 8 replaces ASTM A 354 Grade BD for diameters of 1-1/2 inches and less). Added note comparing titanium materials and on material selection to minimize galling. The Part
11、Identification Number Field for materials was expanded to two characters for all materials. Changes in coating materials: MIL-L-46010 deleted for dry film coatings. Adding marking requirements for use of coated B7 material per ASTM A 193. Added Zinc/Aluminum Inorganic coatings per ASTM F 1136. Subst
12、ituted ASTM F 1941 for ASTM B 633 and ASTM B 695 for zinc coating requirements. Identified recommended coatings for each stud material. Added a designator for coatings not covered by SAE J2271. SAE J2271 Revised MAY2009 Page 2 of 31 Changes in Quality Assurance requirements: Identified sampling leve
13、ls for tests and inspections. Added ASTM F 788/F 788M and SAE J1061 as references for surface defects inspection. Changed primary inspection method for decarburization/carburization to ASTM F 2328 Deleted several supplementary inspections for ASTM A 193 materials. 1. SCOPE 1.1 Purpose This SAE Parts
14、 Standard provides dimensional and quality assurance requirements for studs in the following configurations in standard materials used for ship system applications: a. Continuous thread studs in UNRC and 8UNR series in the following threads and diameters: UNRC threads (1/4 through 4 inches) UNRF thr
15、eads (1/4 through 1-1/2 inches) 8UNR threads (1-1/8 through 4 inches) b. Double end studs (clamping type) where both ends are of the same minimum thread length in the following threads and diameters: UNRC threads (1/4 through 4 inches) UNRF threads (1/4 through 1-1/2 inches) 8UNR threads (1-1/8 thro
16、ugh 4 inches) Different thread forms on each end are permissible. c. Double end studs (tap end type) where the tap end thread length is equivalent to 1-1/2 nominal diameters: Tap End Thread Forms and Diameters Nut End Thread Forms and Diameters NC-5 interference-fit tap end threads (1/4 through 1-1/
17、2 inches) UNRC threads (1/4 through 4 inches) UNRC threads (1/4 through 4 inches) UNRF threads (1/4 through 1-1/2 inches) UNRF threads (1/4 through 1-1/2 inches) 8UNR threads (1-1/8 through 4 inches) 8UNR threads (1-1/8 through 4 Inches) 1.2 Field of Application These studs are primarily for use in
18、ship systems and equipment. The continuous thread studs and the reduced body diameter double end studs are configurations particularly suited to applications that are subject to high impact (H.I.) shock requirements. 1.3 Configurations and Part Identification Numbers Figure 1 identifies the type and
19、 body configurations of the studs covered by the document. Figure 1 also provides a part numbering system with a unique part identification number for each stud. Table 1 is a listing of the materials covered by this standard. The part identification number identifies thread type, diameter, type of s
20、tud, body diameter, length of the stud, and material (including coating, where applicable). See 6.9 for change in Part Identification Numbers from the previous issue. SAE J2271 Revised MAY2009 Page 3 of 31 Part Numbering System for Studs 1 2 3 4 5 6 7 8 Field (Description) J2271 CC 025 T X 450 F5 g3
21、26Z Coating Designator (When applicable See 4.10 for designators) Material Designator See Table 1 for material designations) Length (3 digits in hundredths of an inch for lengths under 10 inches and 4 digits for longer lengths) See 4.4.2 for permitted length increments Stud Body Configurations (See
22、4.2 and Table 5) F Double End Stud Full Diameter Body (See 4.2.2) R Double End Stud Reduced Diameter Body (See 4.2.1) S Double End Stud (Body diameter Optional See 6.9.2) X No body (continuous thread) Stud Type C Double End Clamping Type (See 4.1.2, Table 3 and Figure 3) D Double End With Tap End (S
23、ee 4.1.2. Table 4 and Figure 4) T Continuous Thread (See 4.1.1. Table 2 and Figure 2) Nominal Diameter 3 digits in hundredths of an inch as shown in Table 2 (See Tables 2 through 5 as applicable) Type Thread First Letter (Nut End). Second Letter (Tap End or other Nut End) Two letters required 1st an
24、d 2nd Letter Designators C UNRC (UNC) thread form (See 4.3) F UNRF (UNF) thread form (See 4.3) U 8UNR (8UN) thread form (See 4.3) 2ndLetter designators only B NC-5 CSF Interference Fit Thread (See 4.3.3) H NC-5 HF Interference Fit Thread (See 4.3.3) N NC-5 ONF (See Appendix B for requirements) S NC-
25、5 HFS Interference Fit Thread (See 4.3.3) See 4.3.3 for additional Navy Developed NC-5 Interference Fit Thread Designators for improved performance SAE Document Number - J2271 The part number example shown above, J2271CC025TX450F5-Z is for a continuously threaded stud with 1/4-20 UNRC threads with a
26、 length of 4-1/2 inches manufactured of carbon steel per SAE J429 Grade 5 and zinc plated. FIGURE 1 - PART IDENTIFICATION NUMBERS (PINS) FOR CONTINUOUS AND DOUBLE END STUDS (INCH SERIES) SAE J2271 Revised MAY2009 Page 4 of 31 TABLE 1 - MATERIALS Fig 1 PIN Field 7 Material Designator Material Standar
27、d Grade or Alloy Diam. (Inches) MarkingTensile Strength ksi (min)(1)Yield Strength (min ksi)(1)Fig. 1 PIN Field 8 Coatings(2)(When Applicable) New Old A1 A ASTM A 193 Chrome-molybdenum-vanadium steel for high temperature B16 2-1/2 and 2-1/2 B16 110 95 B7 B ASTM A 193 Chrome-molybdenum steel for high
28、 temperature B7 2-1/2 and 2-1/2 B7 115 95 Same as above temperature limited by coating (See 6.7) B7 2-1/2 and 2-1/2 115 95 Stainless Steel B8 ASTM A 193 B8 (304) 1-1/2 B8 75 30 None C8 ASTM A 193 B8M (316) 1-1/2 B8M 75 30 None CA ASTM F 593 Stainless Steel Annealed 316 or 316L Group 2 Alloys to 1-1/
29、2 F593B 75 100 30 DCW C ASTM F 593 Stainless Steel Cold Worked 1-1/2 to 2-1/2 BD(4)150 130 D, V, -W, X, Y, Over 2-1/2 140 115 EA E ASTM A 307 Gr A or B to 4 307A or 307B 60 60 100 D, V, W, X, Y, Z F2 SAE J429 (Caution: See 6.4) Grade 2 to None 74 57 7/8 1-1/2 60 36 F5 SAE J 429 (See 6.9.3) Grade 5 t
30、o 1 3 radial lines 120 120 92 D, V, -W, X, Y, Z 1-1/8 to 1-1/2 105 81 F9 F ASTM A 449 (See 6.9.3) Type 1 1-5/8 to 3 A449(5)90 58 Nickel Alloys AC ASTM F 468 UNS 06625 Ni 625 - 4 F468AC(3)120 60 DBN ASTM F 468 Ni-Cr-Mo-W Alloy 686 UNS 06686 Caution (See 6.5.1) Grade 1 to 4 in. F468BN(3)120 165 85 DCN
31、 Grade 2 F468CN(3)135 185 125 DN Grade 3 F468DN(3)160 - 200 150 EN Grade 4 F468EN(3)100 145 45 KK K QQ-N-286 (See 4.6.1) Ni-Cu-Al 10 and g148 16 0 1.000 5 1.125 0 1.250 5 1.375 0 1.500 5 1.625 0 1.750 0 2.000 0 2.250 0 2.500 0 2.750 0 3.000 0 3.250 0 3.500 0 3.750 0 4.000 0 4.250 0 4.500 0 5.000 0 5
32、.500 0 6.000 6.500 7.000 7.500 8.000 8.500 eters for full bodommended for ned MAY2004.5 for end reAMPING TYIONS FOR Cnd Full th B L 16 UTh1.500 1.625 1.750 1.875 2.000 2.125 2.250 2.500 2.750 3.000 3.250 3.500 3.750 4.000 4.250 4.500 4.750 5.000 5.500 6.000 6.500 7.000 7.500 8.000 8.500 9.000 y or r
33、educed bodew design due t9quirements.PE STUD DILAMPING T2 ThreadUmax eNRC reads UTh0.100 00.111 00.125 00.143 00.154 00.167 00.182 00.200 00.222 00.250 00.286 00.286 00.333 00.333 0 0.400 0.444 0.444 0.500 0.500 0.500 0.500 0.500 0.500 0.500 y studs. See Tao limited availabMENSIONS(YPE STUDSPitches
34、(2Pquals 2P NRF reads 8Th.071 .083 .083 .100 .100 .111 .111 .125 .143 .167 .167 0.167 0.167 0.167 0 0 0 0 0 0 0 0 0 0 0 0 0ble 7 for toleranility.Pa1) ) UNR reads .250 .250 .250 .250 .250 .250 .250 .250 .250 .250 .250 .250 .250 .250 .250 .250 ces on ge 10 of 31SAE J2271 Revised MAY2009 Page 11 of 31
35、 NOTE (1): See 4.5 for end requirements. FIGURE 4 - TAP END STUD - FULL DIAMETER BODY AND REDUCED DIAMETER BODY DIMENSIONS(1)TABLE 4 - DIMENSIONS(INCHES) FOR TAP END STUDS (1.5D ENGAGEMENT) Size Diam Tap End Full Thread Length BMUMAX = 2PMinimum Nut End Full Thread Length(2)B Nominal Min Max UNRC (2
36、) providing lubrication, either solid film or anti-galling compound, to the threads prior to assembly (see SAE J2270 for additional information); and/or (3) slowing the tightening process since increased speed generates greater heat from friction and heat accelerates the cold weld process. When desi
37、gn considerations dictate the use of materials for which there is no experience, an evaluation of the material couples resistance to galling should be made to reduce the risk of failures during installation. ASTM G 98 provides a test method for evaluating the galling resistance and yields a threshol
38、d galling stress. This threshold can then be compared to analytically determined contact pressures of the threaded joint during tightening to provide an assessment of the fastener design. 6.8.1 Methods to Prevent Galling of Titanium Studs It is strongly recommended that a dry film lubricant or anti-
39、galling compound be applied to titanium studs to prevent galling. This can be done by ordering the studs with a dry film lubricant applied (see 4.10) or by the installing activity applying an anti-galling compound or dry film lubricant. Dry film lubricants in accordance with SAE AS1701 Class I are s
40、uitable for temperatures below 232 C (450 F). For higher temperature applications the user should utilize a dry film lubricant from SAE AS1701 with a temperature rating suitable for the application. For Navy applications an anti-galling compound per CID A-A-59004 is often specified. For anti-galling
41、 compounds and dry film lubricants other than Class I per SAE AS1701, the installing activity must identify the coating to be used and the process for its application on drawings. 6.9 Part Identification Number Changes in the 2009 Revision The Field for the thread designator has been changed from on
42、e character to two characters so that the threads on both ends of the stud can be identified. The first character is either a C (Coarse) F (Fine) or U (8UN) to designate the primary nut end thread. The second character represents the thread on the tap end or secondary nut end. If the threads are the
43、 same on both ends, then the second character is the same as the first character. In the previous version, the Stud Type and Body Configuration Field covered both the body diameter and type of tap end thread. This Field now designates Body Type and is limited to T for Continuous Threads, F for Full
44、Body, R for Reduced Body and S where either a Full or Reduced Diameter body can be provided at the suppliers option. The material designator has been changed from one character to two characters. Both the old and new material designations are shown in Table 1 - Materials. A coating designator field
45、has been added and the first character of the designator is a “g326” followed by a letter designating the coating. SAE J2271 Revised MAY2009 Page 22 of 31 6.9.1 Deleted Configurations and Their Designators The following stud types and bodies are no longer covered. For dimensional requirements see th
46、e 2004 or earlier issue. U Double End Stud Bolt Undersize (Constant Strength) (See Notes 1 and 2 below) V Double End Stud Bolt Full or Undersize body (Notes 2 and 3 below) X Double End Stud Tap End Interference Fit (NC-5 HFS Threads) Undersize Body (Notes 1 and 2) Y Double End Stud Tap end Interfere
47、nce Fit (NC-5 HFS Threads) Full or Undersize Body (Notes 2 and 3) NOTE 1: The current Reduced Diameter Body “R” has essentially the same minimum body diameter as the old undersized diameter body. However, the maximum body diameter may be slightly larger. NOTE 2: Thread lengths and tolerances may be
48、slightly different on the studs now covered. NOTE 3: Similar Full or Reduced Body Studs are now covered. See 4.2 The previously covered Undersized body studs (designated “U” for clamping studs and “Y” for tap end studs with a NC-5 HFS tap end types) are no longer covered. However, the Reduced Diameter Bodies now covered have the same minimum diameter but a larger maximum diameter than that permitted for the old undersize diameter body. 6.9.2 Designators for Optional Body Types Previously the “V” and “Y” body type designations per
