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 2018 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/AS4108C AEROSPACE STANDARD AS4108 REV. C Issued 1991-07 Reaffirmed 2015-06 Revised 2018-01 Supe
5、rseding AS4108B T-Bolt and Eye Bolt, A286 CRES, 1000 F Fatigue Rated RATIONALE Project to remove QPL requirement from specification. Add an alternative method for the bend test. 1. SCOPE This specification defines the requirements for A286 cres T-bolts and eye bolts, with room temperature tensile st
6、rength of a minimum of 160000 psi, for use with clamps and V-band couplings at 1000 F maximum ambient temperature. 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 appl
7、icable issue of other publications 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 reg
8、ulations unless a specific exemption 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 +1 724-776-4970 (outside USA), www.sae.org. AMS2700 Passivation of Corrosion Resistant Stee
9、ls AMS5731 Steel, Corrosion and Heat-Resistant, Bars, Wire, Forgings, Tubing, and Rings 15Cr - 25.5Ni - 1.2Mo - 2.1Ti - 0.006B - 0.30V Consumable Electrode Melted, 1800 F (982 C) Solution Heat Treated AMS5732 Steel, Corrosion and Heat-Resistant, Bars, Wire, Forgings, Tubing, and Rings 15Cr - 25.5Ni
10、- 1.2Mo - 2.1Ti - 0.006B - 0.30V Consumable Electrode Melted 1800 F (982 C) Solution and Precipitation Heat Treated AMS5737 Steel, Corrosion and Heat-Resistant, Bars, Wire, Forgings, and Tubing 15Cr - 25.5Ni - 1.2Mo - 2.1Ti - 0.006B - 0.30V Consumable Electrode Melted 1650 F (899 C) Solution and Pre
11、cipitation Heat Treated SAE INTERNATIONAL AS4108C Page 2 of 11 AMS5853 Steel, Corrosion and Heat-Resistant, Bars and Wire 15Cr - 25.5Ni - 1.2Mo - 2.1Ti - 0.006B - 0.30V Consumable Electrode Melted 1800 F (982 C) Solution Treated and Work-Strengthened 160 ksi (1103 MPa) Tensile Strength AMS-QQ-P-35 P
12、assivation Treatments for Corrosion-Resistant Steel AMS-STD-753 Corrosion-Resistant Steel Parts: Sampling, Inspection and Testing for Surface Passivation AS7479 Bolts and Screws, Steel, UNS S66286 1650 F Solution Heat Treated Precipitation Heat Treated Before Roll Threaded AS8879 Screw Threads - UNJ
13、 Profile, Inch Controlled Radius Root with Increased Minor Diameter 2.1.2 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 A967/A967M Chemical Passivation Treatments for Stainless Steel
14、Parts ASTM E1417/E1417M Standard Practice for Liquid Penetrant Testing ASTM F606/F606M Test Methods for Determining the Mechanical Properties of Externally and Internally Threaded Fasteners 2.1.3 ASME Publications Available from ASME, P.O. Box 2900, 22 Law Drive, Fairfield, NJ 07007-2900, Tel: 800-8
15、43-2763 (U.S./Canada), 001-800-843-2763 (Mexico), 973-882-1170 (outside North America), www.asme.org. ASME B46.1 Surface Texture, Surface Roughness, Waviness, and Lay 2.1.4 U.S. Government Publications Copies of these documents are available online at http:/quicksearch.dla.mil. MIL-STD-2073-1 Standa
16、rd Practice for Military Packaging 2.1.5 NAS Publications Available from Aerospace Industries Association, 1000 Wilson Boulevard, Suite 1700, Arlington, VA 22209-3928, Tel: 703-358-1000, www.aia-aerospace.org. NASM1312-11 Fastener Test Methods, Method 11, Tension Fatigue SAE INTERNATIONAL AS4108C Pa
17、ge 3 of 11 2.2 Definitions 2.2.1 SUPPLIER Manufacturing activity supplying or quoting on the bolts described in this specification. 2.2.2 CLAMP SUPPLIER Manufacturing activity supplying or quoting the clamp or coupling that contains the bolts described in the specification. 2.2.3 CONTRACT The purcha
18、se order between the user and the clamp supplier. 2.2.4 USER The procuring activity purchasing the clamp or coupling. Also, could be the clamp or coupling manufacturer. 3. REQUIREMENTS 3.1 Qualification The bolts furnished under this specification shall be products that are in accordance with the ap
19、plicable standards, and have been tested and have passed the qualification tests specified herein. 3.2 Material The bolt shall be made from A286 corrosion resistant steel conforming to specifications AMS5731, AMS5732, AMS5737, or AMS5853, then cold worked and precipitation heat treated to a minimum
20、tensile strength of 160000 psi. The material shall be capable of being cold headed without the formation of discontinuities or defects. 3.3 Heat Treatment Heat treatment of the bolts shall be in conformance with 3.2, as applicable, to develop the mechanical properties as defined in 3.10. 3.4 Design
21、and Construction The dimensions of the finished bolt shall conform to the applicable AS standard drawing and this specification. 3.5 Head Forming The heads shall be warm or cold forged. A fillet of not less than 0.030 inch radius for T-bolts (Figure 1A) and 0.100 inch radius (Figure 1B) for eye-bolt
22、s, shall be provided between head and shank surfaces. SAE INTERNATIONAL AS4108C Page 4 of 11 Figure 1 3.6 Surface Treatment and Cleanliness 3.6.1 Surface Treatment Surface treatments on the bolts such as vapor honing, glass bead liquid honing, grit blasting, or other treatments if performed, shall b
23、e done before the final forming of the thread area. No lubricant, coating, or other foreign substance shall be applied to the bolt other than required by the AS part standard drawings. 3.6.2 Surface Contaminants The hardened blanks shall be free from surface contamination or other undesirable elemen
24、ts prior to thread rolling. The processes employed to avoid or remove surface oxides or other contaminants shall not affect the resistance to corrosion, stress corrosion, or fatigue. 3.7 Shank Form and Surface 3.7.1 Squareness and Straightness of Shank and Thread Area with Head The bearing surfaces
25、of the bolt heads shall be as specified on the AS part standard. The straightness of the shank shall be as specified on the AS part standard and the straightness of the thread area shall be within the tolerance of the pitch diameter or the major diameter. NOTE: If the bolt requires a bent shank, the
26、 bend can be performed after the bolt is threaded ensuring that there is no damage to the threads. 3.7.2 Surfaces of Head and Shank Surfaces of head and shank shall be smooth, with a roughness average (Ra) value less than 125 in as measured per ASME B46.1. Surfaces shall be free from longitudinally
27、oriented scratches, notches, folds, scale, or other discontinuities of a depth greater than 1% of the shank diameter; and shall be free from all discontinuities having transverse orientation with regard to the centerline of the shank or head, respectively, or extending across the thread area. Bolts
28、with discontinuities exceeding 0.50 inch in length are rejectable. 3.8 Threads The threads shall be right hand. Thread dimensions, form, and contour shall conform to specification AS8879. 3.8.1 Forming Threads shall be fully formed by a single rolling process after hardening by heat treatment. Befor
29、e rolling the threads, the precipitation heat treated blanks shall be clean in accordance with 3.6. 3.8.2 Incomplete Threads The incomplete threads shall comply with the paragraphs concerning “Incomplete Threads” in AS8879. SAE INTERNATIONAL AS4108C Page 5 of 11 3.8.3 Thread Surfaces Surfaces of thr
30、eads shall be smooth and free from notches, slivers, folds, laps, cracks, and scale, as addressed in AS7479 in the sub-paragraph labeled “Threads” under “Quality.” The threaded portion of the bolts shall be sectioned such that a cross-section of the threads can be viewed. This section shall be mount
31、ed, ground, and polished to look for imperfections (mentioned above) in the surface of the thread flanks. 3.9 Finish All surfaces shall be passivated per AMS2700, Method 1, Type 2 unless Method 2 is authorized by the purchaser or per AMS-QQ-P-35. Verify passivation with the copper sulfate test per A
32、STM A967/A967M or AMS-STD-753. 3.10 Mechanical Properties 3.10.1 Ultimate Tensile Load The finished bolt shall withstand the ultimate tensile loads shown in Table 1. Table 1 - Minimum ultimate tensile load Bolt Size Inch Threads per Inch Tensile Area in2T-Bolt Minimum Ultimate Tensile Load lb Eye Bo
33、lt Minimum Ultimate Tensile Load lb 0.190 32 0.0226 3610 3600 0.250 28 0.0404 6460 4730 0.312 24 0.0640 10240 7200 0.375 24 0.0951 15210 - 0.437 20 0.1288 20600 - 0.500 20 0.1717 27470 - NOTES: 1. Tensile Area = Cross-Sectional Area Based on Maximum Pitch Diameter per AS8879. 2. T-Bolt Ultimate Tens
34、ile Load = Tensile Area x 160000. 3. Eye Bolt Ultimate Tensile Load = Based on Application Requirements. SAE INTERNATIONAL AS4108C Page 6 of 11 3.10.2 Fatigue Strength The finished bolts shall withstand an average of 65000 fatigue cycles when loaded in accordance with Table 2. No individual bolt tes
35、ted shall fail at less than 45000 fatigue cycles. The bolts need not be fatigue tested in excess of 130000 cycles if failure has not occurred before that time. The fatigue test is a Tension-Tension test. Table 2 - Fatigue strength Bolt Size Inch Threads per Inch Root Area in2T-Bolt Fatigue Load Mini
36、mum lb T-Bolt Fatigue Load Maximum lb Eye Bolt Fatigue Load Minimum lb Eye Bolt Fatigue Load Maximum lb 0.190 32 0.0186 135 1350 90 900 0.250 28 0.0342 248 2480 167 1670 0.312 24 0.0549 398 3980 254 2540 0.375 24 0.0839 608 6080 - - 0.437 20 0.1132 821 8210 - - 0.500 20 0.1536 1110 11100 - - NOTES:
37、1. Root Area = Cross-Sectional Area Based on the maximum Minor Diameter per AS8879. 2. T-Bolt Maximum Tension Fatigue Load = Root Area x 72000 psi T-Bolt Minimum. Tension Fatigue Load = 0.1 x Maximum Tension Fatigue Load. 3. Eye Bolt Maximum Fatigue Load = Based on Application Requirements of Eye Bo
38、lt Minimum Tension Fatigue Load = 0.1 x Maximum Tension Fatigue Load. 3.10.3 Stress Rupture The finished bolts shall withstand the stress rupture test of 4.6.3 when tested at the loads specified in Table 3. Table 3 - Minimum required stress rupture load Bolt Size Inch Threads per Inch Root Area in2T
39、-Bolts Stress Rupture lb Eye Bolts Stress Rupture lb 0.190 32 0.0186 1300 1200 0.250 28 0.0342 2390 2070 0.312 24 0.0549 3840 3150 0.375 24 0.0839 5870 - 0.437 20 0.1132 7920 - 0.500 20 0.1536 10800 - NOTES: 1. Root Area = Cross-Sectional Area Based on the maximum Minor Diameter per AS8879. 2. T-Bol
40、t Stress Rupture Load = Root Area x 70000. 3. Eye bolt Stress Rupture Load = Based on Application Requirements. SAE INTERNATIONAL AS4108C Page 7 of 11 3.10.4 Bend Test The unthreaded shank of the finished bolts, unthreaded bolt or a suitable unthreaded length of wire from the same manufacturing, mat
41、erial and heat treat lot shall withstand being bent over a mandrel or other suitable bending device per Table 4 and per Figure 4 with no evidence of cracks. The bolt shall be bent at least 90 from straight so that the internal angle is 90 or less. Table 4 - Bend mandrel size Bolt Size (Inch) Threads
42、 per Inch Mandrel Diameter Max 2D per Figure 4 (Inch) 0.190 32 0.380 0.250 28 0.500 0.312 24 0.625 0.375 24 0.750 0.437 20 0.875 0.500 20 1.000 Figure 4 - Bolt bend test 3.11 Discontinuities and Surface Contamination - (FPI) 3.11.1 Discontinuities The bolts shall not contain discontinuities that equ
43、al or exceed the values specified herein. 3.11.2 Cracks The bolts shall be free from cracks in any direction or location. A crack is defined as a clean crystalline break passing through a grain or grain boundary and appearing on a surface. The bolts will be Fluorescent Penetrant Inspected (FPI) as s
44、pecified in 4.6.5 if needed. 3.11.3 Laps and Seams The bolts shall not possess laps or seams less than 0.062 inch apart in any direction. The number of laps or seams, locations, depths, and lengths shall conform to the following requirements unless otherwise specified on the AS part standard. SAE IN
45、TERNATIONAL AS4108C Page 8 of 11 3.11.4 Crossbar or Head Laps or seams are permitted in the top, sides, or ends of the head that are not greater than 0.032 inch in length and that do not exceed twice the depth limits of Table 5. Laps or seams in the underside or bearing surface of the head shall be
46、permitted providing they do not exceed 0.032 inch in length and are not greater in depth than the depth limits of Table 5. There shall be a maximum of three laps or seams per head. Table 5 - Limits for seam depth Bolt Size (Inch) 0.1900 through 0.3125 0.3750 0.4375 0.5000 Depth (Inch) 0.005 0.006 0.
47、007 0.008 3.11.5 Head-to-Shank Junction There shall be no laps in the head-to-shank junction. 3.11.6 Shank The shank may possess longitudinal laps or seams provided the depth does not exceed the depth limits of Table 5. Any one of the laps or seams may extend the total length of the shank so long as
48、 the total of all the laps or seams does not exceed twice the length of the shank. There shall be a maximum of four laps or seams on any one bolt. 3.11.7 Other Discontinuities Discontinuities not covered above and all discontinuities transverse to the grain flow such as pipes, grinding checks, and q
49、uench cracks shall not be allowed. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection Unless otherwise specified in the contract, the Supplier or Clamp Supplier is responsible for the performance of all inspection and testing requirements as specified herein. Except as otherwise specified, the Supplier or the Clamp Supplier may utilize his own facilities or any acceptable commercial laboratory.
