1、MIL-F-85731 14 April 1986 SUPERSEDING MS 14108 15 October 1982 8 December 1958 (See 6.4) MIL-C-172 (IN PART) MILITARY SPECIFICATION FASTENER, POSITIVE LOCKING, ELECTRONI-C EQUIPMENT, GENERAL SPECIFIATION FOR This specification is approved for use by all Departments and Agencies of the Department of
2、Defense. 1. SCOPE 1.1 Scope. This specification covers positive locking fasteners for use in aircraft to secure electronic line replaceable units (LRUs) i ntended 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications, standards and handbooks. Unless otherwise specified, the followin
3、g specifications, standards and handbooks of the issue listed in that issue of the Department of Defense Index of Specifications and Standards (DODISS) specified in the solicitation form a part of this specification to the extent specified herein. Beneficial comments, (recommendations, additions, de
4、letions) and any pertinent data.which may be of use in improving this document should be addressed to the Naval Air Engineering Center, Systems Engineering and Standardization Department (Code 93.1, Lakehurst, NJ. 08733-5100, by using the self-addressed Standardization Document Improvement Proposal
5、(DD Form 1426) appearing at the end of this document or by letter. AMSC NIA FSC 5340 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. THIS DOCUblENT CONTAINS / PAGES. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SP
6、ECIFICATIONS FEDERAL QQ-P-35 QQ-P-416 PPP-B-566 PPP-B-576 PPP-B-585 PPP-B-591 PPP-B-601 PPP-B-62 1 PPP-B-636 PPP-B-665 PPP-B-676 PPP-H-1581 PPP-T-60 MILITARY MI L-P-1 1 6 MIL-H-6088 MIL-H-6875 MIL-A-8625 MIL-L-8937 MIL-L-10547 STANDARDS MILITARY MI L-STD-105 MIL-F-85731 Passivation Treatments for Co
7、rrosion Resistant Steel Plating, Cadmium (Electrodeposited) Box, Fol di ng, Paperboard Box, Wood, Cleated, Veneer, Paper Overlaid Box, Wood, Wi rebound Boxes, Shipping, Fiberboard, Wood-Cleated Boxes, Wood, Cleated Plywood Box, Wood, Nailed and Lock Corner Box, Shipping, Fiberboard Boxes, Paperboard
8、, Metal Edge and Components Boxes, Setup Hardware (Fasteners and Related Items), Packaging of Tape, Packagi ng, Waterproof Preservation, Methods of Heat Treatment of Aluminum Alloys Heat Treatment of Steels (Aircraft Practices) For Anodic Coatings, for Aluminum and Aluminum A Lubricant, Solid Film,
9、Heat Cured, Corrosion Inhibiting, NATO Code 5-1738 , Process 1 loys Liner, Case and Sheet, Overwrap, Water Vaporproof Or Waterproof, Flexible Sampling Procedures and Tables for Inspection by Attributes 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-
10、,-c MIL-F-B573L 53 m 9777706 OLL2520 T MIL-F-85731 MI L-STD-129 Marking for Shipment and Storage MI L-STD-130 Identification Marking of U. S. Military Property MI L-STD-81 O Environmental Test Methods and Engineering Guidelines DOD-STD-1788 Avionics Interface Design Standard (Copies of specification
11、s, standards, handbooks, drawings and publications required by manufacturers in connection with specific acquisition functions should be obtained from the contracting activity or as directed by the contracting officer.) 2.2 Other publications. The following document(s1 form a part of this spectficat
12、ion to the extent specified herein. The issues of the documents which are indicated as DoD adopted shall be the issue listed in the current DQDISS and the supplement thereto, if applicable. AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM B1 17 Method of Salt Spray (Fog) Testing (Application f
13、or copies of ASTM publications should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.) 2.3 Order of precedence. In the event of a conflict between the text of this specification and the references cited herein, the text of this specification
14、shall take precedence. 3. REQUIREMENTS 3.1 Specification sheet. The individual item requirements shall be as specified herein and in accordance with the applicable specification -sheet. . In the event of any conflict between the requirements of this specification and the specification sheet, the lat
15、ter shall govern. 3.2 Qualification. The fasteners furnished under this specification shall be products which are qualified for listing on the applicable Qualified Products List at the time set for opening of bids (see 4.3 and 6.3). 3.2.1 Requalification. Requalification will be required in the even
16、t any change is made in the product design, material, heat treatment, finish or lubrication. 3.2.2 Retention of qualification. To maintain status on the Qualified Product List, certification shall be submitted at two year intervals to indicate continued compliance with the requirements of this speci
17、fication (see 4.3.1). 3.3 Material. The material shall be as specified herein in the applicable specifiation sheet. 3 c 1, Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-F-85731 3.3.1 Heat treatment. 3.3.1.1 Aluminum alloy. Heat treatment of alu
18、minum alloy components shall be i n accordance with MIL-H-6088. 3.3.1.2 Corrosion resistant steel (CRES) and alloy steel. Heat treatment of CRES and alloy steel components shall be in accordance with MIL-H-6875. 3.3.2 Protective treatment. Fastener components shall be plated or treated as specified
19、herein or in the applicable specification sheet or standard. 3.3.2.1 Passivation. Fastener components fabricated from corrosion resistant steel shall be passivated in accordance with QQ-P-35. 3.3.2.2 Surface oxide. After heat treatment of corrosion-resistant steel fastener components, all surface ox
20、ide shall be removed by a means thatwill produce no intergranular or surface corrosion. 3.3.2.3 Alloy steel. Fastener components fabricated from alloy steel shall be cadmi um plated in accordance with QQ-P-416, Type II, Class 2. 3.3.2.4 Aluminum alloy. Fastener components fabricated from aluminum al
21、loy shall be anodized in accordance with MIL-A-8625. 3.4 Design. The fastener is designed to secure line replaceable units (LRUs) in military aircraft. When used in conjunction with a mating holddown device, it will secure the LRU in a stable position in the aircraft (see 6.1). 3.5 Lubricant. When s
22、pecified in the applicable specification sheet or standard, the lubricant used on the fastener shall be in accordance with MIL-L-8937. 3.6 Environmental requirements. The fasteners shall be capable of functioning without damage when subjected to the environmental conditions in 3.6.1 throgh 3.6.3. -
23、- 3.6.1 Endurance. The fastener shall be capable of withstanding 2000 cycles (as described in 3.6.1.1) of locking and unlocking without degradation of performance (see 4.5.2). 3.6.1.1 Cycle. One complete performance of the fastener from zero pound to the preload poundage and then back to the initial
24、 zero poundage. 3.6.2 Corrosion. The fastener shall be capable of five (5) lock and unlock endurance cycles described in 3.6.1.1 after being subjected to the corrosion test (see 4.5.3). 3.6.3 Sand and dust. The fastener shall be capable of five (5) lock and unlock endurance cycles descri bed in 4.5.
25、2 after being subjected to the sand and dust test (see 4.5.4). 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-F-85731 3.6.4 Vibration and shock. The fastener shall not.become loose or unlocked when subjected to the vibration and shock test (se
26、e 4.5.5). 3.6.5 Static load. The fastener shall meet the loads specified in the applicable specification sheet when subjected to the static load test (see 4.5.6). assembly will not hang in a position that will interfere with the installation or removal of other equipment. 3.6.6 Equipment interface.
27、The unattached extractor front holddown 3.6.7 Thermal shock. The extractor front holddown shall maintain its functional characteristics during alternate exposure to extremities of high and low temperatures according to MIL-STD-202, Test Condition “B“. 3.6.8 Fungus. The extractor shall demonstrate a
28、resistance to fungus development according to MIL-STD-810, Method 508.1, Procedure I. 3.69 Fluid immersion. Clutch function, parts and spindle travel will not deteriorate after being immersed in MIL-N-5606 hydraulic fluid and MIL-L-7808 oil for eight hours. -3.6.10 Box lift during extraction. The fa
29、stener front holddown shall not allow more than 0.917 in. (5mm) of lift at the front end of the box. 3.7 Identification marking. The fasteners shall be marked for identifi- cation in accordance with the applicable specification sheet or standard and MI L-STD-130. 3.8 Workmanship. Workmanship shall b
30、e consistent with the type of product, finish and the class of thread fit specified. Sharp edges shall be broken; hanging burrs and slivers that might become dislodged during usage shall be removed. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the
31、contract or purchase order, the contractor is responsible for the performance of all inspection- requirements as specified herein. Except-as otherwise specified in the contract or purchase order, the contractor may use his. own or any other facilit-ies suitable for the performance of the inspection
32、require- ments specified herein, unless disapproved by the Government. The Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. 4.1.1 Test equipme
33、nt and inspection facilities. The manufacturer shall insure that test and inspection facilities of sufficient accuracy, quality and quantity are established and maintained to permit performance of required i nseections. Provided by IHSNot for ResaleNo reproduction or networking permitted without lic
34、ense from IHS-,-,-MIL-F-85731 4.2 Classification of inspections. The inspection requirements specified herein are classified as follows: a. Qualification inspection (4.3) b. Quality conformance inspection (4.4) 4.3 Qualification inspection. Qualification inspection shall be performed at a laboratory
35、 acceptable to the Government (see 6.3) on sample units produced with equipment and procedures normally used in production. 4.3.1 Sample. The qualification test samples shall consist of twenty units. 4.3.2 Inspection routine. Sample units shall be subjected to the qualification inspection specified
36、in table I in the order shown. TABLE I. Qualification inspection. Inspection Visual and dimensional examination Endurance Corrosion Sand and dust Vibration and shock Static load Requirement 3 3 3.6.1 “ 3 3.6.2 3 3.6.3 4 3.6.4 4 3.6.5 Test met hod paragraph 4.5.1 4.i.2 4.5.3 4.5.4 4.5.5 4.5.6 4.3.3 R
37、etention of qualification. To retain qualification, the contractor shall forward a report at two year intervals to the qual ifying activity (see 6.3). The qualifying activity shall establish the initial reporting date. This qualification certification, signed by a responsible official of management
38、shall attest that the manufacturer has the capability to produce fasteners under conditions equal to those existing at the time of the original approved listing. 4.3.4 Certified test report. The manufacturer shall furnish a certified test report showing that the manufacturers product satisfactorily
39、conforms to this specification. The test report shall include as a minimum actual results of the tests specified herein. When this report is submitted, it shall be Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-F-B5731 53 7997906 OL1252q 7 MIL-F
40、-85731 accompanied by a dated drawing which describes the manufacturers product by specifying all dimensions and tolerances, .composition of materials selected, coating or plating applied, and the hardness. The manufacturers part number for each size shall be included on the drawing. 4.4 Quality con
41、formance inspections. Quality conformance inspections shall consist of the tests specified in table II. TABLE II. Quality conformance inspections Inspection Visual and dimensional examination Endurance (5 cycles) Corrosion (2 hours) I Requ i remen t paragraph 3.6.1 3.6.2 Test method paragraph .4.5.1
42、 4.5.2 4.5.3 4.4.1 InsDection lot. The insDection lot shall be as defined in MIL-STD-105. 4.4.2 Sampling. 4.4.2.1 Sampling for quality conformance inspections. A random sample of each item shall be selected in accordance with MIL-STD-105, inspection level S-1 , Acceptable Qual i ty Level (AQL) of 1
43、.5 percent defective. For visual examination, fasteners shall be selected in accordance with MIL-STD-105, inspection level 1, AQL of 2.5 percent defective. 4.4.3 Resubmitted inspection lots. Resubmitted inspection lots shall be in accordance with MIL-STD-105. A resubmitted inspection lot shall be in
44、spected using a tightened inspection. Where the original acceptance number was zero, a sample size represented by the next higher sample size code letter shall be selected. 4.4.4 Manufacturers inspection report. Each production lot of fasteners shall be accompanied by two copies of the manufacturers
45、 inspection report signed by an authorized representative of the manufacturer. This report shall state that the fasteners are from a production lot(s) which was manufactured, inspected and accepted in accordance with requirements of this specification. The report shall identify the part number and t
46、he production lot number(s and shall include all actual test results or certifications of conformance. 4.5 Test methods. 4.5.1 Visual and dimensional examination. The fasteners shall be examined for conformance to the requirements of this specification and the applicable specification sheet. P 7 -c_
47、 y. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-f 1 MIL-F-85731 4.5.2 Enduraice. The fasteners shall be mounted in a suitable tray ixture, as defined in 3.6.1. During lock operation, a preload of 103 lbs to 26 1 bs (460N to 560N) shall be exerted
48、 on each hook and maintain the reading as specified in DOD-STD-1788. During this test there shall be a check reading of the forces every 50 cycles. The force reading must be within the force to1 erance range. 4.5.3 Corrosion. The fasteners shall be subjected to the salt spray (fog) test of ASTM B117
49、 for 168 hours. Upon completion of this test, the samples shall be subjected to the endurance test of 4.5.2 for Five (5) cycles only. 4.5.4 Sand and dust. The fasteners shall be subjected to the sand and dust test of MIL-STD-810, Method 510.1. Upon completion of this test the samples shall then be subjected to the endurance test of 4.5.2 for five (5) cycles only. 4.5.5 Vibration and shock. The fasteners shall be subjected to the vib
