O-RINGS A SERVICE PUBLICATION OF LOCKHEED MARTIN AERONAUTICAL SYSTEMS SPECIAL DOUBLE ISSUE. Previous Page Table of Contents Next Page
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1 OCTOBER MARCH 1996 A SERVICE PUBLICATION OF LOCKHEED MARTIN AERONAUTICAL SYSTEMS SPECIAL DOUBLE ISSUE O-RINGS
2 Elastomers and Age Control Editor Charles I. Gale Special Double Issue: Vol. 22, No. 4, October - December 1995 Vol. 23, No. 1, January - March 1996 CONTENTS 2 Focal Point J. C. Davis, Manager Product Design Division Art Director Anne Anderson 3 O-Rings A new and fully revised compilation of the most commonly used data on the O-rings and backup rings installed in the Hercules aircraft. 5 Indexes 7 Gland O-rings for use in hydraulic fluids. 12 Single-turn backup rings for use with gland O-rings in hydraulic fluids. 16 Double-turn backup rings for use with gland O-rings in hydraulic fluids. 18 Continuous backup rings for use with gland O-rings in hydraulic fluids. 19 Boss O-rings for use in hydraulic fluids. 20 Backup O-rings for use with boss O-rings in hydraulic fluids. 21 Gland O-rings for use in lubricating oils. 25 Boss O-rings for use in lubricating oils. 26 Gland O-rings for use in common jet fuels. 31 Boss O-rings for use in common jet fuels. A Glossary of Useful Terms. 32 Gland O-rings for use in breathing oxygen. 35 Boss O-rings for use in breathing oxygen. O-Rings Revisited. Cover: A C-130 based with the 50th TAS at Little Rock AFB faces a new day at Ramstein AB in Germany. This aircraft is one of the many Hercules airlifters being used to support Operation Joint Endeavor, bringing relief to war-ravaged Bosnia. Cover photograph by John Rossino Service News is published by Lockheed Martin Aeronautical Systems, a unit of Lockheed Martin Corporation. The information contained in this issue is considered by Lockheed Martin to be accurate and authoritative; it should not be assumed, however, that this material has received approval from any governmental agency or military service unless specifically noted. This publication is intended for planning purposes only, and must not be construed as authority for making changes on aircraft or equipment, or as superseding any established operational or maintenance procedures or policies. Written permission must be obtained from Lockheed Martin Aeronautical Systems before republishing any material in this periodical. Copyright 1996, Lockheed Martin Corporation. This entire issue of Service News magazine is devoted to O-rings. It seems ironic that a simple, molded, doughnutshaped part made of a single material could warrant so much attention. The selection of a specific O-ring is based on a variety of factors, including fluid media resistance, temperature range, hardness, durability, gland size, static or dynamic application, etc. There have been some significant technological advances in materials in recent history, but sometimes the best solution is still the simplest. While the use of fluorosilicone and fluorocarbon materials has become more widespread, the best choice often continues to be a basic nitrile butadiene (or Buna N) elastomer. Unfortunately, the nitrile compounds require age control. J. C. Davis Why is basic nitrile a better choice than a fluorosilicone or fluorocarbon compound which doesn t require age control? The tradeoff for fluorocarbon is higher cost and decreased low-temperature resistance; for fluorosilicone it is high cost and decreased durability. The cost factor is influenced by raw materials costs, processing costs, shrinkage control, and other considerations. In the past, MIL-STD-1523, Age Control of Age-Sensitive Elastomeric Material (for Aerospace Applications), has provided the requirements for age control. This included requirements for elastomeric O-rings as well as other age-sensitive products such as aircraft hoses. The original MIL-STD-1523, issued in 1973, gave specific requirements for receipt and delivery of age-sensitive materials. Revision (A) to MIL-STD-1523 was released in This revision simplified the requirements by controlling only the allowable time period from start to end; that is, cure date to maximum age at acceptance by a Government Acquiring Activity. The contractor was required to control all the interim steps and requirements so that the overall provisions of the military standard would be satisfied. Now, as a result of the Perry Initiative to reduce the number of military specifications, MIL-STD-1523A has been canceled without replacement. Age controls for hose products are delineated by SAE Aerospace Standard AS1933, Age Controls for Hose Containing Age-Sensitive Elastomeric Material. However, there is no reference to or replacement for age control of O-rings and other non-hose products. Does this mean that age control of O-rings is no longer necessary? Emphatically, no. This simply transfers the total responsibility to the contractor. The transfer of responsibility for age control to the contractors will not affect the ability of Lockheed Martin Aeronautical Systems (LMAS) to control and deliver quality products to our customers. We and other OEMs have had internal requirements documents all along. These documents follow guidelines of the previous military requirements while tailoring the requirements to individual company needs. The LMAS controlling document is ER8094, Limited Calendar Life Limitations. This document will continue to be used by LMAS to ensure that our customers receive a fresh and viable product. PRODUCT SUPPORT FIELD SUPPORT Sincerely, J. L. GAFFNEY DIRECTOR SUPPLY SUPPORT J. C. Davis, Manager Product Design Division LOCKHEED MARTIN AERONAUTICAL SYSTEMS TECHNICAL SUPPORT CUSTOMER TRAINING Address all communications to Editor, Service News, Department 66-14, Lockheed Martin Aeronautical Systems, Marietta, GA Tel ; Fax J.D. Adams J.L. Bailey H.D. Hall S.S. Clark
3 Newly Revised and Updated: O-RINGS by Jim Roberts, Engineer, Sr. Standards and Specifications Group Service News is pleased to present its fourth special issue devoted entirely to the subject of O-rings. The present update contains the latest information on the O-rings (also known as preformed packings) and backup rings used in the hydraulic, lubrication, fuel, and breathing oxygen systems of the Hercules airlifter and many other types of aircraft. This article consists of a multi-part index and 12 component charts. Please note that these O-ring charts do not authorize random substitutions, but are provided to Hercules operators for comparison and informational purposes. A New Format To help simplify use, the index has been reformatted to include an alphanumeric listing of all O-rings and backup rings, and listings by system and component type. Superseded parts are clearly identified for each system and application (gland or boss). Temperature ranges are now provided in both Fahrenheit and Celsius scales. Note that the temperature values shown in parentheses are nominal values provided by Lockheed Martin Aeronautical Systems Standards and Specifications Engineering. Hydraulic system O-rings and backup rings are listed on Charts 2A, 2B-1, 2B-2, 2B-3, 2C, and 2D. Chart 2A details gland O-rings used in hydraulic systems. An M83461/1 O-ring listing was added to supplement previously issued information. The 2B-series of gland backup ring charts have been expanded to three. The latest addition (2B-3) lists the sizes of MS27595 continuous backup rings. Also, M8791/1 Teflon backup rings were added to the 2B-1 chart. The contents of Chart 2C covering boss O-rings and Chart 2D for boss backup rings have not been changed since the previous Service News O-ring issue. Lubrication oil system O-rings and backup rings are listed on Charts 3A and 3B. Both charts now include information for the AS3551 O-ring. Fuel system O- rings and backup rings are listed on Charts 4A and 4B. Breathing oxygen system O-rings and backup rings are listed on Charts 5A and 5B. When using the charts, be sure to refer to the notes below. This information should be consulted any time part substitution is considered. If problems concerning substitutability are encountered, contact your nearest Lockheed Martin Field Service representative. We have also provided the names and addresses of several selected manufacturers of O-rings and backup rings for your convenience. Chart Notes: All dimensions are given in inches. In Charts 2A, 3A, and 4A: O-ring sizes -013 through -028, -117 through -149, and -223 through -247 of MS28775, MS29561, MS29513, and M83248/1 are intended for use as static seals. These O-rings should not to be used in applications involving reciprocating or rotary motion. Charts 1, 2A, 2C, 3A, 3B, 4A, and 4B: O-rings made of Buna N have a limited shelf life. Any O- rings made of this material still in stock with cure dates exceeding 120 months should be discarded. In Chart 1, the temperatures listed in the Temperature Range column are nominal values supplied by Lockheed Martin Standards and Specifications Engineering. Charts 2A, 3A, and 4A: When an O-ring made of fluorocarbon material is to be substituted for one made of Buna N, special care should be taken with regard to temperature ranges. Fluorocarbon O-rings may not be adequate if they are used in aircraft Lockheed Martin SERVICE NEWS V22N4 - V23N1 3
4 which operate primarily in frigid environments. O- rings made of fluorocarbon material are somewhat less tolerant of low temperatures than those made of Buna N. Suppliers The names and addresses of selected suppliers are given in the listing below. National O-Rings Patton Road Downey, CA Tel: Parker-Hannifin Corp Palumbo Drive Lexington, KY Tel: Stillman Seal 6020 Avenida Encinas Carlsbad, CA Tel: Wynns-Precision, Inc. 104 Hartman Drive Lebanon, TN Tel: PARCO, Inc Parco Ave. Ontario, CA Tel: O-RINGS, BACKUP RINGS DIMENSION VIEWS ID = internal diameter T = thickness W = width DESIGN CHART APPLICATION O-RINGS Charts 2A, 2C, 3A, 3B, 4A, 4B, 5A, 5B SINGLE-TURN BACKUP RINGS Charts 2B-1, 2D DOUBLE-TURN BACKUP RINGS Chart 2B-2 CONTINUOUS BACKUP RINGS Chart 2B-3 4 Lockheed Martin SERVICE NEWS V22N4 - V23N1
5 Chart 1 ALPHANUMERIC O-RING and BACKUP RING LIST Lockheed Martin SERVICE NEWS V22N4 - V23N1 5
6 Chart 1 HYDRAULIC SYSTEM O-RINGS (MIL-H-5606 and MIL-H-83282) Chart 1 HYDRAULIC SYSTEM BACKUP RINGS (MIL-H-5606 and MIL-H-83282) Chart 1 LUBRICATION SYSTEM O-RINGS (MIL-L-7808 and MIL-L-23699) 6 Lockheed Martin SERVICE NEWS V22N4 - V23N1
7 Chart 1 FUEL SYSTEM O-RINGS (JP-4, JP-5, JP-8, Jet A, Jet A-1, and Jet B) Chart 1 BREATHING OXYGEN O-RINGS Chart 2A GLAND O-RINGS for Use in MIL-H-5606 and MIL-H HYDRAULIC FLUIDS Lockheed Martin SERVICE NEWS V22N4 - V23N1 7
8 Chart 2A GLAND O-RINGS for Use in MIL-H-5606 and MIL-H HYDRAULIC FLUIDS 8 Lockheed Martin SERVICE NEWS V22N4 - V23N1
9 Chart 2A GLAND O-RINGS for Use in MIL-H-5606 and MIL-H HYDRAULIC FLUIDS Lockheed Martin SERVICE NEWS V22N4 - V23N1 9
10 Chart 2A GLAND O-RINGS for Use in MIL-H-5606 and MIL-H HYDRAULIC FLUIDS 10 Lockheed Martin SERVICE NEWS V22N4 - V23N1
11 Chart 2A GLAND O-RINGS for Use in MIL-H-5606 and MIL-H HYDRAULIC FLUIDS Lockheed Martin SERVICE NEWS V22N4 - V23N1 11
12 Chart 2B-1 SINGLE-TURN BACKUP RINGS for Use With GLAND O-RINGS in MIL-H-5606 and MIL-H HYDRAULIC FLUIDS 12 Lockheed Martin SERVICE NEWS V22N4 - V23N1
13 Lockheed Martin SERVICE NEWS V22N4 - V23N1 Chart 2B-1 SINGLE-TURN BACKUP RINGS for Use With GLAND O-RINGS in MIL-H-5606 and MIL-H HYDRAULIC FLUIDS 13
14 Chart 2B-1 SINGLE-TURN BACKUP RINGS for Use With GLAND O-RINGS in MIL-H-5606 and MIL-H HYDRAULIC FLUIDS 14 Lockheed Martin SERVICE NEWS V22N4 - V23N1
15 Lockheed Martin SERVICE NEWS V22N4 - V23N1 Chart 2B-1 SINGLE-TURN BACKUP RINGS for Use With GLAND O-RINGS in MIL-H-5606 and MIL-H HYDRAULIC FLUIDS 15
16 Chart 2B-2 DOUBLE-TURN BACKUP RINGS for Use With GLAND O-RINGS in MIL-H-5606 and MIL HYDRAULIC FLUIDS 16 Lockheed Martin SERVICE NEWS V22N4 - V23N1
17 Chart 2B-2 DOUBLE-TURN BACKUP RINGS for Use With GLAND O-RINGS in MIL-H-5606 and MIL-H HYDRAULIC FLUIDS Lockheed Martin SERVICE NEWS V22N4 - V23N1 17
18 Chart 2B-3 CONTINUOUS BACKUP RINGS for Use With GLAND O-RINGS in MIL-H-5606 and MIL-H HYDRAULIC FLUIDS 18 Lockheed Martin SERVICE NEWS V22N4 - V23N1
19 Chart 2B-3 CONTINUOUS BACKUP RINGS for Use With GLAND O-RINGS in MIL-H-5606 and MIL-H83282 HYDRAULIC FLUIDS Chart 2C BOSS O-RINGS for Use in MIL-H-5606 and MIL-H HYDRAULIC FLUIDS Lockheed Martin SERVICE NEWS V22N4 - V23N1 19
20 Chart 2D BACKUP RINGS for Use With BOSS O-RINGS in MIL-H-5606 and MIL-H HYDRAULIC FLUIDS 20 Lockheed Martin SERVICE NEWS V22N4 - V23N1
21 Chart 3A GLAND O-RINGS for Use in MIL-L-7808 and MIL-L LUBRICATING OILS Lockheed Martin SERVICE NEWS V22N4 - V23N1 21
22 Chart 3A GLAND O-RINGS for Use in MIL-L-7808 and MIL-L LUBRICATING OILS 22 Lockheed Martin SERVICE NEWS V22N4 - V23N1
23 Chart 3A GLAND O-RINGS for Use in MIL-L-7808 and MIL-L LUBRICATING OILS Lockheed Martin SERVICE NEWS V22N4 - V23N1 23
24 Chart 3A GLAND O-RINGS for Use in MIL-L-7808 and MIL-L LUBRICATING OILS 24 Lockheed Martin SERVICE NEWS V22N4 - V23N1
25 Chart 3A GLAND O-RINGS for Use in MIL-L-7808 and MIL-L LUBRICATING OILS Chart 3B BOSS O-RINGS for Use in MIL-L-7808 and MIL-L LUBRICATING OILS Lockheed Martin SERVICE NEWS V22N4 - V23N1 25
26 Chart 4A GLAND O-RINGS for Use in COMMON JET FUELS 26 Lockheed Martin SERVICE NEWS V22N4 - V23N1
27 Chart 4A GLAND O-RINGS for Use in COMMON JET FUELS Lockheed Martin SERVICE NEWS V22N4 - V23N1 27
28 Chart 4A GLAND O-RINGS for Use in COMMON JET FUELS 28 Lockheed Martin SERVICE NEWS V22N4 - V23N1
29 Chart 4A GLAND O-RINGS for Use in COMMON JET FUELS Lockheed Martin SERVICE NEWS V22N4 - V23N1 29
30 Chart 4A GLAND O-RINGS for Use in COMMON JET FUELS 30 Lockheed Martin SERVICE NEWS V22N4 - V23N1
31 Chart 4A GLAND O-RINGS for Use in COMMON JET FUELS Chart 4B BOSS O-RINGS for Use in COMMON JET FUELS BACKUP RING - A spiral-cut or continuous ring of Teflon-type material placed in the gland between the O-ring and groove side walls to prevent seal extrusion. BOSS O-RING - A preformed packing used to seal fluid connections conforming to MS33649 or equivalent. DYNAMIC SEAL - A type of seal where there is relative motion between some part of the packing and the sealing surface, such as a piston and shaft seal. EXTRUSION - The distortion or flow, under pressure, of a portion of a seal into the clearance between mating metal parts. Preformed Packings A GLOSSARY OF USEFUL TERMS GLAND O-RING - A preformed packing used to seal grooved cutouts conforming to MIL-G-5514 or the equivalent. O-RING - A torus-shaped preformed packing, made of synthetic rubber, used to seal fluid connections. PACKING - A generic term used to describe a hydraulic seal that prevents leakage between two surfaces. STATIC SEAL - A type of seal where there is no relative motion between the O-ring and sealing surface. In some cases, limited freedom may be provided to permit the packing to change its shape within the gland when under pressure. Lockheed Martin SERVICE NEWS V22N4 - V23N1 31
32 Chart 5A GLAND O-RINGS for Use in BREATHING OXYGEN 32 Lockheed Martin SERVICE NEWS V22N4 - V23N1
33 Chart 5A GLAND O-RINGS for Use in BREATHING OXYGEN Lockheed Martin SERVICE NEWS V22N4 - V23N1 33
34 Chart 5A GLAND O-RINGS for Use in BREATHING OXYGEN 34 Lockheed Martin SERVICE NEWS V22N4 - V23N1
35 Chart 5B BOSS O-RINGS for Use in O-Rings Revisited One of the most confusing and aggravating jobs faced by most mechanics is the finding, identifying, removing, and replacing of preformed packings, most often referred to as simply O-rings. This issue is for those mechanics to assist in cross-referencing part numbers, in determining dimensions, and in proper care and handling from storage to installation of preformed packings. So reads the first paragraph of the main article in Service News, Vol. 3, No.1, dated January-March It was our first special O-ring issue, and it turned out to be the most frequently requested issue the magazine had published up to that time. An update, significantly enlarged and revised, was issued in Vol. 11, No. 3, the July-September issue in Referring to the original O-ring feature, the introduction to the update comments: The article proved to be so popular that our supplies of the issue that contained it were soon exhausted. Volume 3, Number 1 of Service News has been completely out of stock for several years, and we have had to disappoint the many readers who have contacted us and asked for additional copies. With this issue, we hope again to be able to satisfy the need for a reliable and easy-to-use source of data on O-rings. The new issue helped meet that need, but not for long. It attracted so much interest that the new issue, too, was soon out of stock, even though an extra thousand copies had been printed. In the April-June Service News issue of 1990, (Volume 17, Number 2) we offered another O-ring edition, again fully updated and revised, and this time we printed two thousand extra copies. That proved to be a more realistic number, and since then we have been able to offer copies to our readers who request them. Until now, that is. Fortunately, when both the need to modernize our published O-ring data and dwindling stocks of the previous O-ring issue reminded us that the time for yet another revision had arrived, Jim Roberts of our Engineering Standards and Specifications Group was ready. Jim s update, which is published in this issue, represents the largest and most thoroughgoing presentation of O-ring information yet offered in Service News magazine. We are most grateful for his careful and comprehensive work. This is also the appropriate time to salute the earlier contributions of Ed Akers, Anne Anderson, Jim Buttram, Dan Jolley, and Jim Loftin, whose dedicated efforts on our previous O-ring issues provided both the models and the tradition of excellence upon which the present edition could be based. Lockheed Martin SERVICE NEWS V22N4 - V23N1 35
36 Aeronautical Systems Customer Training Systems Department Lockheed Martin - LMAS Marietta, GA
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