SAE J 995-2017 Mechanical and Material Requirements for Steel Nuts.pdf

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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 2017 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:/standards.sae.org/J995_201707 SURFACE VEHICLE STANDARD J995 JUL2017 Issued 1967-08 Revised 2017-07 Superseding J9

5、95 FEB2012 Mechanical and Material Requirements for Steel Nuts RATIONALE Add “Heavy Hex Slotted” to the column heading in Tables 6, 7, and 8 that now contains “Hex High Slotted and Hex Thick Slotted Nuts”. 1. SCOPE This SAE Standard covers the mechanical and material requirements for three grades of

6、 steel nuts suitable for use in automotive and related engineering applications, in sizes 1/4 to 1-1/2 inches, inclusive, and with dimensions conforming with the requirements of the latest issue of SAE J482 or ASME B18.2.2, except for machine screw nuts which are not covered in this standard. This d

7、ocument does not include limits for surface discontinuities. Where usage requires such control, limits may be specified separately. For sizes 1/4 through 1 inch, this may be done by the statement: “Surface discontinuities shall not exceed the limits specified in ASTM F812/F812M.” 2. REFERENCES 2.1 A

8、pplicable Documents The following publications form a part of this specification to the extent specified herein. Unless otherwise indicated, the latest issue of SAE publications shall apply. 2.1.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, T

9、el: 877-606-7323 (inside USA and Canada) or +1 724-776-4970 (outside USA), www.sae.org. SAE J409 Product Analysis Permissible Variations from Specified Chemical Analysis of a Heat or Cast of Steel SAE J417 Hardness Tests and Hardness Number Conversions SAE J482 Hexagon High Nuts SAE INTERNATIONAL J9

10、95 JUL2017 Page 2 of 9 2.1.2 ASME Publications Available from ASME, P.O. Box 2900, 22 Law Drive, Fairfield, NJ 07007-2900, Tel: 800-843-2763 (U.S./Canada), 001-800-843-2763 (Mexico), 973-882-1170 (outside North America), www.asme.org. ASME B18.2.2 NUTS FOR GENERAL APPLICATIONS - MACHINE SCREW NUTS,

11、HEX, SQUARE, HEX FLANGE, AND COUPLING NUTS (INCH SERIES) ASME B18.18 Quality Assurance for Fasteners 2.1.3 ASTM 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. ASTM F606 Test Methods for Determin

12、ing the Mechanical Properties of Externally and Internally Threaded Fasteners, Washers, and Rivets ASTM F812/F812M Surface Discontinuities of Nuts, Inch and Metric. ASTM F1470 Fastener Sampling for Specified Mechanical Properties and Performance Inspection 3. DESIGNATION The three grades of nuts are

13、 designated Grades 2, 5, and 8. 4. MATERIAL Nuts shall be made of steel conforming to the chemical composition limits specified in Table 1. Table 1 - Chemical composition requirements(1)Nut Grade C Max Mn Min P Max S Max 2 0.55 - 0.12(2)0.15(3)5 0.55 0.30 0.05(4)(5)0.15(3)(5)8 0.55 0.30 0.04 0.05(6)

14、(1)All values are for ladle analysis (percent by weight) and subject to standard variations for check analysis as given in SAE J409. (2)Resulfurized and rephosphorized material is not subject to rejection based on check analysis for sulfur. (3)If agreed between purchaser and producer, sulfur content

15、 may be 0.23 maximum. (4) Phosphorus content may be 0.13 maximum for acid bessemer steel only. (5) If agreed between purchaser and producer, sulfur content may be 0.35 maximum and phosphorus content may be 0.12 maximum provided that manganese content is 0.70 minimum. (6) If agreed between purchaser

16、and producer, sulfur content may be 0.33 maximum provided that manganese content is 1.35 minimum. SAE INTERNATIONAL J995 JUL2017 Page 3 of 9 5. MECHANICAL REQUIREMENTS 5.1 Proof Load Nuts described in this document shall withstand the proof load stress specified in Table 2 for the nut grade, size, a

17、nd thread series. Table 2 - Proof load requirements for nuts(1)Nut Grade 2 5 8 Nut Size 1/4 thru 1-1/2 1/4 thru 1-1/2 1/4 thru 1 1/4 thru 1 Over 1 thru 1-1/2 Over 1 thru 1-1/2 1/4 thru 1-1/2 1/4 thru 1-1/2 Thread Series UNC and 8UN UNF, 12 UN and Finer UNC and 8UN UNF, 12 UN and Finer UNC and 8UN UN

18、F, 12UN and Finer UNC and 8UN UNF, 12UN and Finer Nut Type Proof Load Stress, psi (1) Proof Load Stress, psi (1) Proof Load Stress, psi (1) Proof Load Stress, psi (1) Proof Load Stress, psi (1) Proof Load Stress, psi (1) Proof Load Stress, psi (1) Proof Load Stress, psi (1) Hex 90000 80000 120000 10

19、9000 105000 94000 150000 150000 Hex Flange 90000 80000 120000 109000 105000 94000 150000 150000 Hex Jam(2) 54000 48000 72000 65000 63000 57000 90000 90000 Heavy Hex Jam(2) 54000 48000 72000 65000 63000 57000 90000 90000 Hex Slotted(2) 71000 65000 96000 87000 84000 75000 120000 120000 Heavy Hex(2) 10

20、0000 90000 133000 120000 116000 105000 165000 150000 Hex Thick(2) 100000 90000 133000 120000 116000 105000 165000 150000 Hex Thick Slotted(2) 79000 71000 105000 96000 92000 84000 132000 120000 Hex High(2) 100000 90000 133000 120000 116000 105000 165000 150000 Hex High Slotted(2) 79000 71000 105000 9

21、6000 92000 84000 132000 120000 Square 90000 80000 105000 96000 92000 84000 132000 120000 Heavy Square 100000 90000 133000 120000 116000 105000 165000 150000 NOTE: (1) The proof load in pounds for nuts is computed by multiplying the proof load stress, in psi (lbf/in2), for the nut grade, size, thread

22、 series, and type, as shown in Table 2, and tensile stress area in square inches (in2), for the applicable size and thread series shown in Table 3. (For tabulated values see Appendix A.) To convert the inch based pounds per square inch (psi) values above to metric Megapascal (MPa) units, multiply th

23、e above values by .00689. (2) Proof load stress values for hex jam, heavy hex jam, hex slotted, heavy hex, hex thick, heavy hex slotted, and hex thick slotted nuts are based on the requirement for hex nuts. Primarily, each value is derived from the ratio of the minimum thickness of the product invol

24、ved to the minimum thickness of similar hex or square machine screw nuts and hex nuts (see B18.2.2) of the same size. SAE INTERNATIONAL J995 JUL2017 Page 4 of 9 Table 3 - Tensile stress areas (test bolt or mandrel) 5.2 Hardness Nuts shall have hardness within the limits specified in Table 4. Table 4

25、 - Hardness requirements for nuts 6. TEST METHODS For proof load and hardness testing procedures refer to ASTM F606. 7. MARKING Three “styles” of grade marking are acceptable. Style A is applicable to all types and sizes of nuts. Style B is applicable to hex nuts of sizes 5/8 inch and larger, but ma

26、y be used for smaller sizes or other types of nuts only when authorized by the purchaser. Style C is applicable to nuts that are fabricated by cutting from hex bar. Marking for source (manufacturer or private label distributor) identification shall be by the manufacturers or private label distributo

27、rs mark. The manufacturers mark is represented by “X” in the illustrations below. Markings shall not project beyond the height or width across flats of the nuts. No more than 10% of the nut top surface area may be used for grade and source markings. In the case of double chamfer nuts, one face only

28、is considered a top surface. SAE INTERNATIONAL J995 JUL2017 Page 5 of 9 Table 5 - Marking dimensions (1) For hex flange nuts, lines on the top of the flange may be up to two times the dimensions shown.Style A marking shall be depressed on the top surface of the nut on a circular line or path approxi

29、mately midway between hole diameter and hex flat diameter, or, for hex flange nuts at the suppliers option, raised or depressed on top of the flange, and shall consist of no marks for Grade 2 nuts; two circumferential lines 120 apart for Grade 5 nuts; and two circumferential lines 60 apart for Grade

30、 8 nuts. The circumferential lines shall conform to the following dimensions (inch, nominal) (see Table 5): Grade 2 Grade 5 Grade 8 Style B marking shall be raised or depressed on the chamfer surface of the top of the nut corners, and shall consist of: no marks on Grade 2 nuts; one circumferential l

31、ine on each of two corners 120 apart for grade 5 nuts; and one circumferential line on each of two corners 60 apart for Grade 8 nuts. Grade 2 Grade 5 Grade 8 Style C marking shall consist of notches at the hexagon corners, one notch at each corner for Grade 5 nuts, and two notches at each corner for

32、 Grade 8 nuts. Grade 2 Grade 5 Grade 8 SAE INTERNATIONAL J995 JUL2017 Page 6 of 9 7.1 Grade 2 nuts are not required to be marked for grade or source identification. 7.2 Grade 5 and Grade 8 hex and hex flange nuts, sizes 1/4 through 1-1/2, shall be marked for grade identification and for source ident

33、ification. Grade 5 and Grade 8 hex jam, heavy hex jam, hex slotted, heavy hex slotted, hex thick slotted, hex thick, and heavy hex nuts are not required to be marked for grade or source identification, unless specified by the purchaser. If marked, Grade 5 and Grade 8 hex jam, heavy hex jam, hex slot

34、ted, heavy hex slotted, hex thick slotted, hex thick, and heavy hex nuts shall be marked with grade and source identification marks. 8. TESTING REQUIREMENTS 8.1 Manufacturers Responsibility During the manufacture of products to the requirements of this specification, the manufacturer shall make peri

35、odic tests to ensure that the properties of the product are being maintained within specified limits. For all Grade 8 nuts, and for Grade 5 hex and hex flange nuts, each lot shall be tested for material properties conducted in accordance with the sampling plans in ASTM F1470 or B18.18 as applicable

36、and the test results shall be recorded in a test report. When requested in writing by the purchaser, the manufacturer shall furnish a copy of the test report certified to be a report of the results of the lot for Grade 8 nuts or Grade 5 hex or hex flange nuts, or, for other nuts, of the last complet

37、ed set of tests for the specific type, size, and grade of product. 8.2 General A lot is a quantity of one part number that has been processed essentially under the same conditions from the same heat treatment lot and produced from one mill heat of material and submitted for inspection at one time. T

38、he same test specimens may be used for different tests wherever practical. If the failure of a test specimen is due to improper preparation of the specimen or to incorrect testing technique, the specimen shall be discarded and another specimen substituted. 9. NOTES 9.1 Revision Indicator A change ba

39、r (l) located in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial changes, have been made to the previous issue of this document. An (R) symbol to the left of the document title indicates a complete revision of the document, including tech

40、nical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only. SAE INTERNATIONAL J995 JUL2017 Page 7 of 9 Table 6 - Proof load for miscellaneous nuts,(1)LBF (unc threads only) Nominal Nut Size and Threads Per Inch Hex and Hex Flange

41、Nuts Hex Jam and Heavy Hex Jam Nuts Hex Slotted Nuts Grade 2 Grade 5 Grade 8 Grade 2 Grade 5 Grade 8 Grade 2 Grade 5 Grade 8 1/4 - 20 2850 3800 4750 1750 2300 2850 2250 3050 3800 5/16 - 18 4700 6300 7850 2800 3750 4700 3700 5050 6300 3/8 - 16 7000 9300 11600 4200 5600 7000 5500 7450 9300 7/16 - 14 9

42、550 12800 15900 5750 7650 9550 7550 10200 12800 1/2 - 13 12800 17000 21300 7650 10200 12800 10100 13600 17000 9/16 - 12 16400 21800 27300 9850 13100 16400 12900 17500 21800 5/8 - 11 20300 27100 33900 12250 16300 20300 16050 21700 27100 3/4 - 10 30100 40100 50100 18000 24000 30100 23700 32100 40100 7

43、/8 - 9 41600 55400 69300 25000 33300 41600 32800 44400 55400 1 - 8 54500 72700 90900 32700 43600 54500 43050 58200 72700 1-1/8 - 7 68700 80100 114000 41200 48100 68700 54200 64100 91600 1-1/4 - 7 87200 102000 145000 52350 61000 87200 68800 81400 116000 1-3/8 - 6 104000 121000 173000 62350 72800 1040

44、00 82000 97000 139000 1-1/2 - 6 126000 148000 211000 75850 88500 126000 99750 118000 169000 Nominal Nut Size and Threads Per Inch Heavy Hex, Hex Thick, Hex High and Heavy Square Nuts Heavy Hex Slotted, Hex High Slotted and Hex Thick Slotted Nuts Square Nuts Grade 2 Grade 5 Grade 8 Grade 2 Grade 5 Gr

45、ade 8 Grade 2 Grade 5 Grade 8 1/4 - 20 3200 4250 5250 2500 3350 4200 2850 3350 4200 5/16 - 18 5200 6950 8650 4150 5500 6900 4700 5500 6900 3/8 - 16 7750 10300 12800 8100 8150 10200 7000 8150 10200 7/16 - 14 10600 14100 17500 8400 11200 14000 9550 11200 14000 1/2 - 13 14200 18900 23400 11200 14900 18

46、700 12800 14900 18700 9/16 - 12 18150 24200 30000 14350 19100 24000 16400 19100 24000 5/8 - 11 22600 30100 37300 17800 23700 29800 20300 23700 29800 3/4 - 10 33300 44400 55100 26350 35100 44100 30100 35100 44100 7/8 - 9 46050 61400 76200 36400 48500 61000 41600 48500 61000 1 - 8 60450 80600 100000 4

47、7700 63600 80000 54500 63600 80000 1-1/8 - 7 76300 88500 126000 60300 70200 101000 68700 70200 101000 1-1/4 - 7 96900 112000 160000 76550 89100 128000 87200 89100 128000 1-3/8 - 6 115500 134000 191000 91250 106000 152000 104000 106000 152000 1-1/2 - 6 140500 163000 232000 111000 129000 185000 126000

48、 129000 185000 NOTE 1: Values computed by multiplying the strength values (psi) in Table 2 by the tensile stress area (in2). The values are rounded to the closest 50-pound increment. 2: To convert the inch based pounds values above to metric based Newtons (N) multiple the values above by 4.448. SAE INTERNATIONAL J995 JUL2017 Page 8 of 9 Table 7 - Pr