1、- MIL:G-5bL3 53 7777706 OLL2203 7 3-aT-sS- -MIL-G-85613 5 October-1983 Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Engineering Specifications and Standards Department (Code 93) , Naval Air E
2、ngineering Center, Lakehurst , NJ 08733, by using the self -addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. i MILITARY SPECIFICAT ION GROMMET, HARD SEAT, SWAGED, COUNTERSINK; GENERAL SPECIFICATION FOR This specification is ap
3、proved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. holes of access panels. 2. APPLICABLE DOCUMENTS 2.1 Government documents This specification covers swaged grommets for use in countersink 2.1.1 Specifications, standards and handbooks. Unless otherwise s
4、pecified, the following specitications, 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. SPEC IF I CAT IONS FEDERAL QQ-
5、A-250/4 Aluminum alloy 2024, plate and steel Hardware (Fastener and Re1 ated Items) Packagi ng and Packing for Shipment and Storage of Tape, Packaging , Paper (For Carton Seal i ng) PPP-H - 15 81 PPP-T-76 ST NDARDS MILITARY MI L-STD-105 Sampling Procedures and Tables for Inspection by Attributes Mar
6、king for Shipmen and Storage MI L -STD- 1 29 Licensed by Information Handling ServicesProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-2.3 Order of precedence. specification and the references cited herein, the text of this specification chal 1 take p
7、recedence. In the event of a conflict between the text of this 3, REQUIREMENTS 3.1 Specification sheets or standards. The individual item requirements shall be as specified herein and in accordance with the applicable specification sheets or standards. requirements of this specification and the spec
8、ification sheet or standard, the latter shall govern. In the event of any conflict between 3.2 Design and Construction. 3.2.1 Construction. The grommets shall be of single or multiple-piece construction. The grommet shall consist of boss, retaining ring cavity and collar (see Figure 1) that shall be
9、 swaged into the fastener countersink hole of the access panel . 3.2.2 Dimensions. in accordance with the applicable specification sheet. Dimensions and tolerances shall be as specified herein and 3.2.3 Concentricit Concentricity shall be as specified on the applicable spec i i: ik&(see 4.5.2) . 3.3
10、. Materials. The grommets shall be fabricated from materials in accordance with the applicable specification sheet (see 4.3). 3.4 Discontinuities. Al 1 grommets shall be examined by fluorescent particle inspection (see 4.5.5) . Any grommets having discontinuities equal to or exceeding 0,008-inch sha
11、ll be rejected. Care must be exercised to avoid confusing cracks, as described in 3.4.1, with other discontinuities. 3.4.1 Cracks. Grommets shall be free of cracks in any direction or location. A cracmefined as a clean crystalline break passing through the grain or grain boundary without the inclusi
12、on of foreign elements. 3.5 Protective treatment. Protective treatment shall be in accordance with the applicable specification sheet. 3.6 Lubricant. spec7fication sheet. Lubricant shall be as specified on the applicable 3.7 Marking. Marking shall be as specified on the applicable specification shee
13、t . 3.8 Mechanical properties. 3.8.1 Installation. The grommet shall be installed by swaging the collar in to the Pastener countersink hole of the access panel (see 4.5.3). 3.8.2 Grommet collar and boss durablility. The gromet shall pass the durability test (see 4.5.4). 2 Provided by IHSNot for Resa
14、leNo reproduction or networking permitted without license from IHS-,-,-MIL-G-85bL3 53 m 7779906 OLL2205 2 m MIL-STD-105 Sampling Level MIL-G-85613 AQL % 4, QUALITY ASSURANCE PROVISIONS Re qu i rement Test Paragraph 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purc
15、hase order, the contractor is responsible for the performance of all inspection requirements as specified herein. specified in the contract or purchase order, the contractor may use his own or any other facilities suitable for the performance-of the inspection requirements specified herein, unless d
16、isapproved 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 siippl ies and services conform to prescribed requirements. Except as otherwise Inspection Paragraph 4.2 Classificati
17、on of inspections. herein shall be as classified as follows: The inspection requirements specified I I s-2 s-2 a. Material inspection (see 4.3) b. Quality conformance inspection (see 4.4). 1.0 1 .o 1.5 1.5 4.3 Materials inspection. supported by verifying data that the materials used in fabricating t
18、he grommets are in accordance with the applicable specification sheets and st andard s. 4.4 Quality conformance inspection. Quality conformance inspection shall be as specified in Table I. Materials inspection shall consist of certification 1. Examination 2. Concentricity 3. Installation 4. Durabi 1
19、 ity TABLE I. Quality conformance inspections. 3.2 3.2.3 3.7. .1 3.7.2 I I I 4.5.1 4.5.2 4.5.3 4.5.4 4.4.1 Sampling for examination. accordance with MIL-STD-105. (AQL) shall be as specified in Table I. for any of the tests, provided selection of random samples is maintained and known characteristics
20、 of the sample are not used to influence the integrity of test results. Test samples shall be selected at random-in Inspection level and acceptance quality level Identical sample items may be used 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL
21、-G-SbL3 53 W 7997906 01iL220b LI MIL-G-85613 4.4.2 Sampling for tests. Test samples shall consist of grommets produced as a single lot of each type, class and diameter and made from one heat of material. the sample lot test data shall be provided to the procuring activity as indicated below: Sample
22、for Tests Hard Seat Grommets Part Number Name of Manufacturer Submitted by (name) (date) for acceptance tests in accordance wl th MIL-G-85613 4.4.2.1 Lot. A lot shall consist of grommets made from the same lot of material and fabricated as a single continuous production run in which the forming mach
23、ine set up remains unchanged except for head configuration. A lot shall be restricted to one material and diameter of grommet. A lot of material shall be defined as the quantity of sheet, strip or rod made from a single heat, It shall be controlled and shlpped with appropriate mill certification or
24、certificate of conformance. 4.4.3 Certified test report. The manufacturer shall furnish certification that the product conforms to the specification. The manufacturer chal 1 maintain, for a period of three years, a record of inspections by lot number. The certificate shall state that the required in
25、spections were conducted and that the product met the requirements of this specification. 4.5 Methods of inspection. 4.5.1 Examlnatlon. accordance with 4.4.1 shall be examined visually for conformance to the requirements for dimensions, protective treatment, and marking. Optical aids or special gage
26、s may be used to ensure compliance with this specification. Any dimensional characteristics are considered defective when out of tolerance. Each of the sample grommets selected at random in 4.5.2 Concentricity. The concentricity test shall be performed using the grommet 1.0. as an axis. A dial indic
27、ator set against the test diameter and zeroed. THe grommet shall be rotated 360“. The maximum dial variation shall meet the concentricity requirements. The test shall be conducted on all surfaces with concentricity requirements. 4.5.3 Installation. Six grommets shall be installed on 2024-T3 aluminum
28、 alloy test plates in accordance with QQ-A-250/4 (see Figures 2 through 4). Holes shall be in accordance with the applicable specification sheet. Fifty percent of the grommets shall be tested at the minimum grip and the other fifty percent at the maximum grip. After installation, the grommets shall
29、be inspected for defects such as deformed boss or collar splits. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G-85613 53 9999906 OLL2207 b MIL-G-85613 4.5.4 Grommet collar and boss durability test. installed into a test plate as shown in Fig
30、ure 5. subjected to 200 installation and removal cycles. seated by torqueing to the values specified in Table II. run at a rate slow enough to limit temperature increase of grommet to 75F above room ambient. The grommets shall be The grommets shall be The fastener shall be The test shall be The foll
31、owing defects shall constitute failure: a. b. c. Deformation of boss outside of dimensional limits. Splits in collar or other areas. Deformation that reduces depth of retaining ring cavity by 0,005-inch due to collar material flowing into retaining ring cavity. TABLE II. Seating torques. r t I Torqu
32、e (in. lb) I Grommet Size I I I I .250 .312 .375 150 200 2 50 4.5.5 Discontinuities. The presence of cracks and discontinuities in grommets shall be determined by fluorescent particle inspection. indications of themselves shall not be cause for rejection. If, in the opinion of the inspector, the ind
33、ications are cause for rejection, the grommets shall be examined by microexamination to determine if the discontinuties are within the limits specified herein. Particle 4.6 be in accordance with Section 5. 5. PACKAGING 5.1 Packaging requirements. The requirements for packaging shall be in accordance
34、 with PPP-H-1581. with water-resistant tape confoming to PPP-T-76. 5.2 Marking of shipments. contract or purchase order (see 6.2), unit and intermediate packages and shipping containers shall be marked in accordance with MIL-STD-129. 6. NOTES Inspection of packaging. The sampling and inspection of p
35、ackaging shall All seams of shipping containers shall be sealed In addition to any special marking required by the 6.1 Intended use. The grommets are intended for use in access panels. The function of the grommet is to reduce wear and elongation in the hole for the fastener used to attach the access
36、 panel. The grommets boss, which extends beyond the surface of the back (under) side of the access panel, will prevent the total preload on the bolt from being transferred to the adjacent seal (preventing seal crushing). panel at the fastener hole. The grommet will prevent warping of the access 5 Pr
37、ovided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-6.2 Ordering data. 6.2,l Acquisition requirements. Acquisition documents should specify the fol lowi ng : (a) Title, number and date of this specification. (b) Specification sheet part number. Qu ant i ty
38、 . Levels of packaging (see 5.1) Special marking (if required). Cuctodi ans : Navy - AS Air Force - 11 Re vi ew Act i vi t i es : Air Force - 99 Amy - AV DLA- IS Amy - AR, MI Preparing Activity: Navy - AS (DoD Project No, 5325-0217) Provided by IHSNot for ResaleNo reproduction or networking permitte
39、d without license from IHS-,-,-MIL-G-856L3 53 = 9779706 0332209 T MIL-G-85613 r COLLAR I BOSS- LRETAINING RING CAVITY FIGURE 1. Hard Seat Grommet. HARD SEAT GROMMET f ACCESS PANEL (REF) - - FIGURE 2. Grommet before swaging. - Provided by IHSNot for ResaleNo reproduction or networking permitted witho
40、ut license from IHS-,-,-I TOOL ACCESS I I I FIGURE 3. Swag i ng . FIGURE 4. Grommet after installation, 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-G-Sb13 53 m 7777906 O112211 - MIL-G-85613 I I -+. BARE .1 c_ 40 LB MISALIGNMENT FORCE - & I
41、NSTALLATION HOLE PER APPLICABLE SPECIFICATION SHEET Size L“ l- w inch inch inch 11 .O80 .750 I .375 4.4 .O80 .937 - mi sal i gnment force. E .y- -. . F FIGURE 5. Durability and compression test fixture. 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
