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/AS5857A AEROSPACE STANDARD AS5857 REV. A Issued 2005-03 Revised 2010-11 Reaffirmed 2017-10 Supe
5、rseding AS5857 Gland Design, O-ring and Other Elastomeric Seals, Static Applications RATIONALE AS5857A has been reaffirmed to comply with the SAE Five-Year Review policy. 1. SCOPE This SAE Aerospace Standard (AS) provides standardized gland (groove) design criteria and dimensions for elastomeric sea
6、l glands for static applications. The glands have been specifically designed for applications using SAE AS568 size O-rings at pressures exceeding 1500 psi (10.3 MPa) utilizing one or two anti-extrusion (backup) rings and applications at pressures under 1500 psi (10.3 MPa) without backup rings. The g
7、lands have been sized to provide increased squeeze as compared to AS4716 for more effective sealing at low temperatures and low seal swell conditions. These glands are not recommended for dynamic use. Primary usage is for static external sealing. The rod dimensions are the same as AS4716. The cylind
8、er bore dimensions are the same as AS4716 except for sizes -001 thru -011 and -104 thru -113. 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 the o
9、ther 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 regulations unless a
10、 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 724-776-4970 (outside USA), www.sae.org. AS568 Aerospace Size Standard for O-rings AS4716 Gland Design, O-ri
11、ng and Other Elastomeric Seals AS5860 Retainers, (Back-Up Rings), Hydraulic and Pneumatic, Polytetrafluoroethylene Resin, Single Turn, Static Gland AS5861 Retainers, (Back-Up Rings), Hydraulic and Pneumatic, Polytetrafluoroethylene Resin, Solid, Static Gland ARP4727 Gland Design, Computation of Sque
12、eze and Gland Volume 2.1.2 ASME Publications Available from the American Society of Mechanical Engineers, 22 Law Drive, Box 2300, Fairfield, NJ 07007-2900, Tel: 973-882-1170, www.asme.org. ASME B46.1 Surface Texture (Surface roughness, waviness & lay) 2.1.3 National Aerospace Standard Publications A
13、vailable from Aerospace Industries Association, Inc., 1000 Wilson Boulevard, Suite 1700, Arlington, VA 22209-3928, Tel: 703-358-1000, www.aia-aerospace.org. NAS 1611 Packing, Preformed O-Ring, Phosphate Ester Resistant 2.1.4 ISO Publications Available from American National Standards Institute, 25 W
14、est 43rd Street, New York, NY 10036-8002, Tel: 212-642-4900, www.ansi.org. ISO 4287 Geometrical Product Specifications (GPS) Surface Texture: Profile Method Terms, Definitions and Surface Texture Parameters 2.2 Order of Precedence In the event of a conflict between the text of this document and the
15、references cited herein, the text of this documents takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. TECHNICAL REQUIREMENTS 3.1 Gland Configuration 3.1.1 General: As a general rule, O-rings and other ela
16、stomeric seals operating above 1500 psi (10.3 MPa) should utilize backup rings or other devices of this nature to prevent seal extrusion. O-ring seal glands designed for backup ring use must be increased in width. Therefore, this document depicts gland widths for applications using zero, one and two
17、 backup rings. The gland widths are designed to work with backup rings with maximum widths given in column 4 of Table 2. For ease of manufacture it is recommended that piston style glands be used where possible. This also improves the assembly of the glands as the O-ring is less likely to be pinched
18、. 3.1.2 Dimensions: The fits and tolerances are the same as those in AS4716 and also Figures 1 and 2 and Tables 3, 4 and 5 are the same. Rod OD (B) and Rod Bore (H) are the same as AS4716. Cylinder Bore (A) and Piston OD (C) are the same as AS4716 except for sizes -001 thru -011 and -104 thru -113 w
19、hich are smaller to avoid excessive stretch. Changes have been made to the other gland dimensions to obtain a goal of 10% minimum squeeze at room temperature. This was achieved in the majority of the glands. See Table 1B. Changes have been made to the gland width dimensions to achieve 90% maximum gl
20、and occupancy at 275 F (135 C) in the zero backup gland width. The gland width of the one and two backup grooves is simply based on adding the maximum backup ring width to the width of the no backup groove plus an allowance for backup ring growth at 275 F (135 C). The additional allowance was added
21、where needed to not exceed 90% fill of the space for the seal. A coefficient of thermal expansion of 7 x 10-5unit length per F (1.26 x 10-4unit length per C) was used for the backup ring material. A coefficient of thermal expansion of 1.5 x 10-4unit length per F (2.7 x 10-4unit length per C) was use
22、d for the elastomer. Gland wall angle and break edge dimensions have been included to permit these glands to be used at pressures up to 8000 psi (55.2 MPa). SAE INTERNATIONAL AS5857A Page 2 of 49_ 3.1.3 Limitations: Some of the smaller sizes have the possibility of exceeding 5% stretch and/or 30% sq
23、ueeze at worst case tolerances. See Table 1B. Those sizes should be avoided unless the designer is confident that the chosen elastomer will work under those conditions. Use of O-rings like NAS1611 which have tighter tolerances than AS568 will reduce the extremes of stretch and squeeze. NOTE: The use
24、 of O-ring seals with a nominal cross section of less than 0.103 inch is problematic for two reasons: (1) The O-ring and gland tolerances are a large percentage of the nominal gland dimensions and the percentage increases as the O-ring cross section decreases. This causes a large range of resultant
25、stretch and squeeze. (2) The ratio of area to volume of O-rings increases significantly as the O-ring cross section decreases. At the same time, the volume of the O-ring is decreasing. This makes the smaller cross section seals much more sensitive than large cross section seals to the rate of attack
26、 by the fluid to which they are exposed. Published data shows that some small cross section nitrile seals exposed to red oil have significantly more loss of swell and therefore loss of cross section diameter than larger cross section seals when exposed to the fluid for the same length of time at hig
27、h temperature. Any seal material that suffers from loss of swell after exposure to a fluid will provide a more reliable seal if a larger cross section seal is used. Therefore, the use of O-ring sizes with a nominal cross section smaller than 0.103 inch or their equivalent proprietary shapes, is not
28、recommended due to the increased possibility of leakage and the subsequent decrease in reliability of the installation. SAE INTERNATIONAL AS5857A Page 3 of 49_ Note:Dynamicapplicationsare shownto illustratetheconceptofrod and piston glands. Thisis not toimplythatthisstandardis tobeusedfordynamicappl
29、ications.FIGURE 1 - GLAND DESIGN SAE INTERNATIONAL AS5857A Page 4 of 49_ FIGURE 2 - GLAND DETAILS SAE INTERNATIONAL AS5857A Page 5 of 49_ TABLE 1A - STANDARD GLAND DIMENSIONS IN INCHES Gland and AS568 Dash No. Piston Or Cylinder OD C Cylinder Bore ID A Gland OD F Rod or Gland Sleeve OD B Rod Bore ID
30、 H Gland ID E 001 0.084 0.087 0.035 0.033 0.036 0.087 0.083 0.086 0.034 0.032 0.035 0.086 002 0.116 0.119 0.048 0.048 0.051 0.119 0.115 0.118 0.047 0.047 0.050 0.118 003 0.149 0.152 0.063 0.063 0.066 0.152 0.148 0.151 0.062 0.062 0.065 0.151 004 0.183 0.186 0.078 0.076 0.079 0.185 0.182 0.185 0.077
31、0.075 0.078 0.184 005 0.215 0.218 0.110 0.108 0.111 0.217 0.214 0.217 0.109 0.107 0.110 0.216 006 0.228 0.231 0.123 0.123 0.126 0.232 0.227 0.230 0.122 0.122 0.125 0.231 007 0.259 0.262 0.154 0.154 0.157 0.263 0.258 0.261 0.153 0.153 0.156 0.262 008 0.291 0.294 0.186 0.185 0.188 0.294 0.290 0.293 0.
32、185 0.184 0.187 0.293 009 0.324 0.327 0.219 0.217 0.220 0.326 0.323 0.326 0.218 0.216 0.219 0.325 010 0.355 0.358 0.250 0.248 0.251 0.357 0.354 0.357 0.249 0.247 0.250 0.356 011 0.418 0.421 0.313 0.310 0.313 0.419 0.417 0.420 0.312 0.309 0.312 0.418 012 0.483 0.486 0.378 0.373 0.376 0.482 0.482 0.48
33、5 0.377 0.372 0.375 0.481 013 0.548 0.552 0.443 0.435 0.438 0.545 0.547 0.550 0.441 0.433 0.437 0.543 014 0.611 0.615 0.506 0.498 0.501 0.608 0.610 0.613 0.504 0.496 0.500 0.606 015 0.673 0.677 0.568 0.560 0.563 0.670 0.672 0.675 0.566 0.558 0.562 0.668 016 0.736 0.740 0.631 0.623 0.626 0.733 0.735
34、0.738 0.629 0.621 0.625 0.731 SAE INTERNATIONAL AS5857A Page 6 of 49_ TABLE 1A - STANDARD GLAND DIMENSIONS IN INCHES (CONTINUED) Gland and AS568 Dash No. Piston Or Cylinder OD C Cylinder Bore ID A Gland OD F Rod or Gland Sleeve OD B Rod Bore ID H Gland ID E 017 0.798 0.802 0.693 0.685 0.688 0.795 0.
35、797 0.800 0.691 0.683 0.687 0.793 018 0.861 0.865 0.756 0.748 0.751 0.858 0.860 0.863 0.754 0.746 0.750 0.856 019 0.923 0.927 0.818 0.810 0.813 0.920 0.922 0.925 0.816 0.808 0.812 0.918 020 0.989 0.993 0.884 0.873 0.876 0.983 0.988 0.991 0.882 0.871 0.875 0.981 021 1.051 1.055 0.946 0.935 0.938 1.04
36、5 1.050 1.053 0.944 0.933 0.937 1.043 022 1.114 1.118 1.009 0.998 1.001 1.108 1.113 1.116 1.007 0.996 1.000 1.106 023 1.176 1.180 1.071 1.060 1.063 1.170 1.175 1.178 1.069 1.058 1.062 1.168 024 1.239 1.243 1.134 1.123 1.126 1.233 1.238 1.241 1.132 1.121 1.125 1.231 025 1.301 1.305 1.196 1.185 1.188
37、1.295 1.300 1.303 1.194 1.183 1.187 1.293 026 1.364 1.368 1.259 1.248 1.251 1.358 1.363 1.366 1.257 1.246 1.250 1.356 027 1.426 1.430 1.321 1.310 1.313 1.420 1.425 1.428 1.319 1.308 1.312 1.418 028 1.489 1.493 1.384 1.373 1.376 1.483 1.488 1.491 1.382 1.371 1.375 1.481 104 0.284 0.287 0.121 0.123 0.
38、126 0.289 0.283 0.286 0.120 0.122 0.125 0.288 105 0.315 0.318 0.152 0.154 0.157 0.320 0.314 0.317 0.151 0.153 0.156 0.319 106 0.347 0.350 0.184 0.185 0.188 0.351 0.346 0.349 0.183 0.184 0.187 0.350 107 0.380 0.383 0.217 0.217 0.220 0.383 0.379 0.382 0.216 0.216 0.219 0.382 SAE INTERNATIONAL AS5857A
39、Page 7 of 49_ TABLE 1A - STANDARD GLAND DIMENSIONS IN INCHES (CONTINUED) Gland and AS568 Dash No. Piston Or Cylinder OD C Cylinder Bore ID A Gland OD F Rod or Gland Sleeve OD B Rod Bore ID H Gland ID E 108 0.412 0.415 0.249 0.248 0.251 0.414 0.411 0.414 0.248 0.247 0.250 0.413 109 0.475 0.478 0.312
40、0.310 0.313 0.476 0.474 0.477 0.311 0.309 0.312 0.475 110 0.539 0.543 0.377 0.373 0.376 0.540 0.538 0.541 0.375 0.371 0.375 0.538 111 0.602 0.606 0.440 0.435 0.438 0.602 0.601 0.604 0.438 0.433 0.437 0.600 112 0.666 0.670 0.504 0.498 0.501 0.665 0.665 0.668 0.502 0.496 0.500 0.663 113 0.732 0.736 0.
41、570 0.560 0.563 0.727 0.731 0.734 0.568 0.558 0.562 0.725 114 0.798 0.802 0.636 0.623 0.626 0.790 0.797 0.800 0.634 0.621 0.625 0.788 115 0.861 0.865 0.699 0.685 0.688 0.852 0.860 0.863 0.697 0.683 0.687 0.850 116 0.923 0.927 0.761 0.748 0.751 0.915 0.922 0.925 0.759 0.746 0.750 0.913 117 0.989 0.99
42、3 0.827 0.810 0.813 0.977 0.988 0.991 0.825 0.808 0.812 0.975 118 1.051 1.055 0.889 0.873 0.876 1.040 1.050 1.053 0.887 0.871 0.875 1.038 119 1.114 1.118 0.952 0.935 0.938 1.102 1.113 1.116 0.950 0.933 0.937 1.100 120 1.176 1.180 1.014 0.998 1.001 1.165 1.175 1.178 1.012 0.996 1.000 1.163 121 1.239
43、1.243 1.077 1.060 1.063 1.227 1.238 1.241 1.075 1.058 1.062 1.225 122 1.301 1.305 1.139 1.123 1.126 1.290 1.300 1.303 1.137 1.121 1.125 1.288 123 1.364 1.368 1.202 1.185 1.188 1.352 1.363 1.366 1.200 1.183 1.187 1.350 SAE INTERNATIONAL AS5857A Page 8 of 49_ TABLE 1A - STANDARD GLAND DIMENSIONS IN IN
44、CHES (CONTINUED) Gland and AS568 Dash No. Piston Or Cylinder OD C Cylinder Bore ID A Gland OD F Rod or Gland Sleeve OD B Rod Bore ID H Gland ID E 124 1.426 1.430 1.264 1.248 1.251 1.415 1.425 1.428 1.262 1.246 1.250 1.413 125 1.489 1.493 1.327 1.310 1.313 1.477 1.488 1.491 1.325 1.308 1.312 1.475 12
45、6 1.551 1.555 1.389 1.373 1.376 1.540 1.550 1.553 1.387 1.371 1.375 1.538 127 1.614 1.618 1.452 1.435 1.439 1.602 1.613 1.616 1.450 1.433 1.437 1.600 128 1.676 1.680 1.514 1.498 1.502 1.665 1.675 1.678 1.512 1.496 1.500 1.663 129 1.739 1.743 1.577 1.560 1.564 1.727 1.738 1.741 1.575 1.558 1.562 1.72
46、5 130 1.802 1.807 1.641 1.623 1.627 1.790 1.801 1.805 1.639 1.621 1.625 1.788 131 1.864 1.869 1.703 1.685 1.689 1.852 1.863 1.867 1.701 1.683 1.687 1.850 132 1.927 1.932 1.766 1.748 1.752 1.915 1.926 1.930 1.764 1.746 1.750 1.913 133 1.989 1.994 1.828 1.810 1.815 1.977 1.988 1.992 1.826 1.808 1.813
47、1.975 134 2.052 2.057 1.891 1.873 1.878 2.040 2.051 2.055 1.889 1.871 1.876 2.038 135 2.115 2.120 1.954 1.936 1.941 2.103 2.114 2.118 1.952 1.934 1.939 2.101 136 2.177 2.182 2.016 1.998 2.003 2.165 2.176 2.180 2.014 1.996 2.001 2.163 137 2.240 2.245 2.079 2.061 2.066 2.228 2.239 2.243 2.077 2.059 2.064 2.226 138 2.302 2.307 2.141 2.123 2.128 2.290 2.301
