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 2014 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/AS8791CAEROSPACESTANDARDAS8791 REV. C Issued 1997-10 Revised 2014-10 Superseding
5、AS8791BHydraulic and Pneumatic Retainers (Back-Up Rings), Polytetrafluoroethylene (PTFE) Resin RATIONALE As a result of the 5 year review, this document has been revised to update the references and the prohibition of use of these parts in glands other than MIL-G-5514 has been further clarified. 1.
6、SCOPE This specification and part standard covers polytetrafluoroethylene (PTFE) resin material and the dimensional requirements for scarf-cut retainers (back-up rings) previously covered by MIL-R-8791 and MIL-R-8791/1. The retainers are intended for use in hydraulic and pneumatic system components
7、as anti-extrusion devices in conjunction with seals and O-rings. 1.1 Use Retainers to the dimensions in this specification are for use in glands to MIL-G-5514 (not for new designs) They shall not be used in glands to AS4716 or AS5857, please refer to the Caution Note below. CAUTION: Parts standard A
8、S5781 for use in AS4716 glands and parts standard AS5860 for use in AS5857 glands have been published. Backup rings to AS8791 shall not be used in AS4716 or AS5857 glands. 2. APPLICABLE DOCUMENTS The following publications form a part of this document to the extent specified herein. The latest issue
9、 of SAE publications shall apply. The applicable 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, h
10、owever, supersedes applicable laws and regulations unless a specific exemption has been obtained. 2.1 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),Website Address www.sae.
11、org.AMS3678 Polytetrafluoroethylene (PTFE) Moldings and Extrusions Unfilled, Pigmented, and FilledCompounds AMS3678/1 Type 1 Virgin Polytetrafluoroethylene (PTFE) Moldings and Extrusions SAE INTERNATIONAL AS8791C Page 2 of 12 AS4716 Gland Design, O-ring and Other Elastomeric Seals AS5781 Retainers (
12、Backup Rings), Hydraulic and Pneumatic, Polytetrafluoroethylene Resin, Single Turn, Scarf-Cut, For Use in AS4716 Glands AS5857 Gland Design, O-Ring and Other Elastomeric Seals, Static Applications AS5860 Retainers, (Back-Up Rings), Hydraulic and Pneumatic, Polytetrafluoroethylene Resin, Single Turn,
13、 Static Gland 2.2 U.S. Government Publications Available from DLA Document Services, Building 4/D, 700 Robbins Avenue, Philadelphia, PA 19111-5094, Tel: 215-697-6396, http:/quicksearch.dla.mil/.MIL-G-5514 Gland Design, Packings, Hydraulic, General Requirements for (Inactive for New Design) MIL-R-879
14、1 Retainer, Packing, Hydraulic and Pneumatic, Polytetrafluoroethylene Resin (Single Turn) (Cancelled) MIL-R-8791/1 Retainer, Packing, Hydraulic and Pneumatic, Polytetrafluoroethylene, Single Turn (Cancelled) MS27595 Retainer, Packing Backup, Continuous Ring, Tetrafluoroethylene (Inactive for New Des
15、ign) MS28773 Retainer, Packing Backup, Tetrafluoroethylene, Straight Thread Tube Fitting Boss (Inactive for New Design) MS28774 Retainer, Packing Backup, Single Turn, Tetrafluoroethylene (Inactive for New Design) MS28782 Retainer, Packing Backup, Teflon (Inactive for New Design) MS28783 Ring, Gasket
16、, Backup, Teflon (Inactive for New Design) 3. TECHNICAL REQUIREMENTS 3.1 Material The material for parts to this specification shall be virgin polytetrafluoroethylene (PTFE) conforming to AMS3678 Type 1, Grade B, Virgin Polytetrafluoroethylene (PTFE) Moldings and Extrusions. 3.2 Safety - Hazardous M
17、aterials While the materials, methods, applications, and processes described or referenced in this specification may involve the use of hazardous materials, this specification does not address the hazards which may be involved in such use. It is the sole responsibility of the user to ensure familiar
18、ity with the safe and proper use of any hazardous materials and to take necessary precautionary measures to ensure the health and safety of all personnel involved. 3.3 Dimensional Requirements The shape and dimensions of PTFE retainers shall conform to Figure 1 and Tables 1A and 1B. 3.3.1 Surfaces a
19、nd Edges Surfaces shall be smooth and free from irregularities. Edges shall be clean and sharp. 3.3.2 Scarf-cut When measuring diameter M 0.001 inches (0.03 mm) over a mandrel (see Tables 1A and 1B) the scarf-cut shall not exceed dimension G and shall exhibit no overlap. These measurements are to be
20、 made at stabilized temperature of 73 F 2 F (23 C 1 C). SAE INTERNATIONAL AS8791C Page 3 of 12 FIGURE 1 - RETAINER, PACKING, HYDRAULIC AND PNEUMATIC, POLYTETRAFLUOROETHYLENE, SINGLE TURN SAE INTERNATIONAL AS8791C Page 4 of 12 TABLE 1A - PART NUMBERS AND DIMENSIONS IN INCHES Part No. M Dia. Gage 0.00
21、1T0.002W0.001GMaxSee 3.3.2ADegrees Range M8791/1-004 M8791/1-005 M8791/1-006 M8791/1-007 M8791/1-008 M8791/1-009 M8791/1-010 M8791/1-011 M8791/1-012 M8791/1-013 M8791/1-014 M8791/1-015 M8791/1-016 M8791/1-017 M8791/1-018 M8791/1-019 M8791/1-020 M8791/1-021 M8791/1-022 M8791/1-023 M8791/1-024 M8791/1
22、-025 M8791/1-026 M8791/1-027 M8791/1-028 M8791/1-110 M8791/1-111 M8791/1-112 M8791/1-113 M8791/1-114 M8791/1-115 M8791/1-116 M8791/1-117 M8791/1-118 M8791/1-119 M8791/1-120 M8791/1-121 M8791/1-122 M8791/1-123 M8791/1-124 M8791/1-125 0.076 0.108 0.123 0.154 0.185 0.217 0.248 0.310 0.373 0.438 0.501 0
23、.563 0.626 0.688 0.751 0.813 0.881 0.943 1.006 1.068 1.131 1.193 1.256 1.318 1.381 0.373 0.435 0.498 0.560 0.623 0.685 0.748 0.815 0.878 0.940 1.003 1.065 1.128 1.190 1.253 1.315 0.050 0.050 0.050 0.050 0.050 0.050 0.050 0.050 0.050 0.050 0.050 0.050 0.050 0.050 0.050 0.050 0.050 0.050 0.050 0.050 0
24、.050 0.050 0.050 0.050 0.050 0.054 0.054 0.054 0.054 0.054 0.054 0.054 0.054 0.054 0.054 0.054 0.054 0.054 0.054 0.054 0.054 0.053 0.053 0.053 0.053 0.053 0.053 0.053 0.053 0.053 0.053 0.053 0.053 0.053 0.053 0.053 0.053 0.053 0.053 0.053 0.053 0.053 0.053 0.053 0.053 0.053 0.086 0.086 0.086 0.086 0
25、.086 0.086 0.086 0.086 0.086 0.086 0.086 0.086 0.086 0.086 0.086 0.086 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0
26、.006 0.006 0.006 45-42 36-33 33-30 27-24 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 SAE INTERNATIONAL AS8791C Page 5 of 1
27、2 TABLE 1A - PART NUMBERS AND DIMENSIONS IN INCHES (CONTINUED) Part No. M Dia. Gage 0.001T0.002W0.001GMaxSee 3.3.2ADegrees Range M8791/1-126 M8791/1-127 M8791/1-128 M8791/1-129 M8791/1-130 M8791/1-131 M8791/1-132 M8791/1-133 M8791/1-134 M8791/1-135 M8791/1-136 M8791/1-137 M8791/1-138 M8791/1-1391M87
28、91/1-210 M8791/1-211 M8791/1-212 M8791/1-213 M8791/1-214 M8791/1-215 M8791/1-216 M8791/1-217 M8791/1-218 M8791/1-219 M8791/1-220 M8791/1-221 M8791/1-222 M8791/1-223 M8791/1-224 M8791/1-225 M8791/1-226 M8791/1-227 M8791/1-228 M8791/1-229 M8791/1-2301M8791/1-325 M8791/1-326 M8791/1-327 M8791/1-328 M87
29、91/1-329 M8791/1-330 M8791/1-331 1.380 1.442 1.505 1.564 1.627 1.689 1.752 1.814 1.877 1.940 2.002 2.065 2.127 2.190 0.748 0.810 0.873 0.935 0.998 1.060 1.123 1.185 1.248 1.310 1.373 1.435 1.498 1.625 1.750 1.875 2.000 2.125 2.250 2.375 2.500 1.498 1.623 1.748 1.873 1.998 2.123 2.248 0.054 0.054 0.0
30、54 0.054 0.054 0.054 0.054 0.054 0.054 0.054 0.054 0.054 0.054 0.054 0.062 0.062 0.062 0.062 0.062 0.062 0.062 0.062 0.062 0.062 0.062 0.062 0.062 0.062 0.062 0.062 0.062 0.062 0.062 0.062 0.062 0.088 0.088 0.088 0.088 0.088 0.088 0.088 0.086 0.086 0.086 0.086 0.086 0.086 0.086 0.086 0.086 0.086 0.0
31、86 0.086 0.086 0.086 0.119 0.119 0.119 0.119 0.119 0.119 0.119 0.119 0.119 0.119 0.119 0.119 0.119 0.119 0.119 0.119 0.119 0.119 0.119 0.119 0.119 0.183 0.183 0.183 0.183 0.183 0.183 0.183 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.0
32、06 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.007 0.007 0.007 0.007 0.007 0.007 0.007 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-
33、19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 SAE INTERNATIONAL AS8791C Page 6 of 12 TABLE 1A - PART NUMBERS AND DIMENSIONS IN INCHES (CONTINUED) Part No. M Dia. Gage 0.001 T0.002 W0.001 GMaxSee 3.3.2 ADegrees Range M8791/1-332 M8791/1-333 M8791/1-334 M
34、8791/1-335 M8791/1-336 M8791/1-337 M8791/1-338 M8791/1-339 M8791/1-340 M8791/1-341 M8791/1-342 M8791/1-343 M8791/1-344 M8791/1-345 M8791/1-346 M8791/1-347 M8791/1-348 M8791/1-349 M8791/1-425 M8791/1-426 M8791/1-427 M8791/1-428 M8791/1-429 M8791/1-430 M8791/1-431 M8791/1-432 M8791/1-433 M8791/1-434 M
35、8791/1-435 M8791/1-436 M8791/1-43712.373 2.498 2.623 2.748 2.873 2.997 3.122 3.247 3.372 3.497 3.622 3.747 3.872 3.997 4.122 4.247 4.372 4.497 4.497 4.622 4.747 4.872 4.997 5.122 5.247 5.372 5.497 5.622 5.747 5.872 5.997 0.088 0.088 0.088 0.088 0.088 0.088 0.088 0.088 0.088 0.088 0.088 0.088 0.088 0
36、.088 0.088 0.088 0.088 0.088 0.120 0.120 0.120 0.120 0.120 0.120 0.120 0.120 0.120 0.120 0.120 0.120 0.120 0.183 0.183 0.183 0.183 0.183 0.183 0.183 0.183 0.183 0.183 0.183 0.183 0.183 0.183 0.183 0.183 0.183 0.183 0.236 0.236 0.236 0.236 0.236 0.236 0.236 0.236 0.236 0.236 0.236 0.236 0.236 0.007 0
37、.007 0.007 0.007 0.007 0.007 0.007 0.007 0.007 0.007 0.007 0.007 0.007 0.007 0.007 0.007 0.007 0.007 0.008 0.008 0.008 0.008 0.008 0.008 0.008 0.008 0.008 0.008 0.008 0.008 0.008 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 2
38、2-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 22-19 *1 For Larger packing retainers (back-up rings) in this series, uncut packing retainers MS27595 are recommended. SAE INTERNATIONAL AS8791C Page 7 of 12 TABLE 1B - PART NUMBERS AND DIMENSIONS IN MILLIMETERS PartNo.MDia.Gage0.025T0.051W0
39、.025GMaxSee3.3.2ADegreesRangeM8791/1-006 3.124 1.270 1.346 0.127 33-30 M8791/1-007 3.912 1.270 1.346 0.127 27-24 M8791/1-008 4.699 1.270 1.346 0.127 22-19 M8791/1-009 5.512 1.270 1.346 0.127 22-19 M8791/1-010 6.299 1.270 1.346 0.127 22-19 M8791/1-011 7.874 1.270 1.346 0.127 22-19 M8791/1-012 9.474 1
40、.270 1.346 0.127 22-19 M8791/1-013 11.125 1.270 1.346 0.127 22-19 M8791/1-014 12.725 1.270 1.346 0.127 22-19 M8791/1-015 14.300 1.270 1.346 0.127 22-19 M8791/1-016 15.900 1.270 1.346 0.127 22-19 M8791/1-017 17.475 1.270 1.346 0.127 22-19 M8791/1-018 19.075 1.270 1.346 0.127 22-19 M8791/1-019 20.650
41、1.270 1.346 0.127 22-19 M8791/1-020 22.377 1.270 1.346 0.127 22-19 M8791/1-021 23.952 1.270 1.346 0.127 22-19 M8791/1-022 25.552 1.270 1.346 0.127 22-19 M8791/1-023 27.127 1.270 1.346 0.127 22-19 M8791/1-024 28.727 1.270 1.346 0.127 22-19 M8791/1-025 30.302 1.270 1.346 0.127 22-19 M8791/1-026 31.902
42、 1.270 1.346 0.127 22-19 M8791/1-027 33.477 1.270 1.346 0.127 22-19 M8791/1-028 35.077 1.270 1.346 0.127 22-19 M8791/1-110 9.474 1.372 2.184 0.152 22-19 M8791/1-111 11.049 1.372 2.184 0.152 22-19 M8791/1-112 12.649 1.372 2.184 0.152 22-19 M8791/1-113 14.224 1.372 2.184 0.152 22-19 M8791/1-114 15.824
43、 1.372 2.184 0.152 22-19 M8791/1-115 17.399 1.372 2.184 0.152 22-19 M8791/1-116 18.999 1.372 2.184 0.152 22-19 M8791/1-117 20.701 1.372 2.184 0.152 22-19 M8791/1-118 22.301 1.372 2.184 0.152 22-19 M8791/1-119 23.876 1.372 2.184 0.152 22-19 M8791/1-120 25.476 1.372 2.184 0.152 22-19 M8791/1-121 27.05
44、1 1.372 2.184 0.152 22-19 M8791/1-122 28.651 1.372 2.184 0.152 22-19 M8791/1-123 30.226 1.372 2.184 0.152 22-19 M8791/1-124 31.826 1.372 2.184 0.152 22-19 M8791/1-125 33.401 1.372 2.184 0.152 22-19 SAE INTERNATIONAL AS8791C Page 8 of 12 TABLE 1B - PART NUMBERS AND DIMENSIONS IN MILLIMETERS (CONTINUE
45、D) PartNo.MDia.Gage0.025T0.051W0.025GMaxSee3.3.2ADegreesRangeM8791/1-126 35.052 1.372 2.184 0.152 22-19 M8791/1-127 36.627 1.372 2.184 0.152 22-19 M8791/1-128 38.227 1.372 2.184 0.152 22-19 M8791/1-129 39.726 1.372 2.184 0.152 22-19 M8791/1-130 41.326 1.372 2.184 0.152 22-19 M8791/1-131 42.901 1.372
46、 2.184 0.152 22-19 M8791/1-132 44.501 1.372 2.184 0.152 22-19 M8791/1-133 46.076 1.372 2.184 0.152 22-19 M8791/1-134 47.676 1.372 2.184 0.152 22-19 M8791/1-135 49.276 1.372 2.184 0.152 22-19 M8791/1-136 50.851 1.372 2.184 0.152 22-19 M8791/1-137 52.451 1.372 2.184 0.152 22-19 M8791/1-138 54.026 1.37
47、2 2.184 0.152 22-19 M8791/1-1391 55.626 1.372 2.184 0.152 22-19 M8791/1-210 18.999 1.575 3.023 0.152 22-19 M8791/1-211 20.574 1.575 3.023 0.152 22-19 M8791/1-212 22.174 1.575 3.023 0.152 22-19 M8791/1-213 23.749 1.575 3.023 0.152 22-19 M8791/1-214 25.349 1.575 3.023 0.152 22-19 M8791/1-215 26.924 1.
48、575 3.023 0.152 22-19 M8791/1-216 28.524 1.575 3.023 0.152 22-19 M8791/1-217 30.099 1.575 3.023 0.152 22-19 M8791/1-218 31.699 1.575 3.023 0.152 22-19 M8791/1-219 33.274 1.575 3.023 0.152 22-19 M8791/1-220 34.874 1.575 3.023 0.152 22-19 M8791/1-221 36.449 1.575 3.023 0.152 22-19 M8791/1-222 38.049 1
49、.575 3.023 0.152 22-19 M8791/1-223 41.275 1.575 3.023 0.152 22-19 M8791/1-224 44.450 1.575 3.023 0.152 22-19 M8791/1-225 47.625 1.575 3.023 0.152 22-19 M8791/1-226 50.800 1.575 3.023 0.152 22-19 M8791/1-227 53.975 1.575 3.023 0.152 22-19 M8791/1-228 57.150 1.575 3.023 0.152 22-19 M8791/1-229 60.325 1.575 3.023 0.152 22-19 M8791/1-2301 63.500 1.575 3.
