1、, MILITARY SPECIFICATION INSERT, SCREW THREAD, THIN WALL, LOCKED IN: GENERAL SPECIFICATION FOR This specification is mandatory for use by all Cepartments and Agencies of the Department of Defense. L -1 i . -5 . 1 e SCOPE 1.1 Scope. This specification covers the requirements for thin wall, solid bush
2、ing, locked in, screw thread inserts. The method of locking in -the insert into the parent material to resist rotation t5 be by means of an integral locking device, either metal 1 ic or non-metal 1 c. 2. APPLICABLE DOCUMENTS . 2.1 The following documents are of the issue in effect on the date of inv
3、itation for bids or request for proposal, form a part of this specification to the extent specified herein. SPECIFICATIONS Federal L-P-410 Plastic, Polyamide .(Nylon) Rigid: Rods, Tubes, Flats, Molded and Cast Parts. QQ-A-225/6 Aluminum Alloy Bar, Rod, and Wire: Rolled, Drawn, or Cold Finished 2024.
4、 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MI L- 1-45932 QQ-A-250/6 QQ-P-35 QQ-P-4 16 QQ-S-365 PPP-H-1581 Mi 1 i tary * MI L-I -6866 -. MI L-A-8625 MIL-S-8879 2 Aluminum Alloy 5083, Plate and Sheet. Passivation Treatments for Adstenitic, Ferrit
5、ic, and Martensitic Corrosion- Resisting Steel (Fastening Devices). Plating, Cadmiu.m (Electrodeposited). Silver Plating, Electrodeposited: General Requirements for. Hardware (Fasteners and Related I terns), Packaging and Packing for Shipment and Stora-ge of. Inspection, Penetrant Method of. Screw T
6、hreads Standard, Optimum Selected Series: General Specification for. An.odic Coatings for Aluminum and Aluminum Alloys. Screw Threads; Control led Radius Root with Increased Minor Diameter: General Specification for. Lubricant, Sol id Film, Heat Cured. r Provided by IHSNot for ResaleNo reproduction
7、or networking permitted without license from IHS-,-,- MIL-1-45732 53 W 7777906 0307235 2 W STANDARDS Federal Standard No. 66: Steel: Chemical Federal Test Method, Std. No. 151 - Metals; Composition and Hardenability Test Methods Military MIL-STD-105 Sampling Procedures and Tables For MIL-STD-109 Qua
8、lity Assurance Terms and Definitio.ns Inspection by Attributes MIL-STD-1312 Fasteners, Test Methods (Copies of specifications, standards, drawings, and publications required by suppliers in connection with specific procurement functions should be obtained from the procuring activity or as directed b
9、y the procuring officer). “See Supplement 1 fop list of associated specification sheets or detail specifications. “ 2.2 Other Publications. The following documents form a part of this specification to the extent specified herein. Unless otherwise indicated, the issue in effect on the date of invitat
10、ion for bids or requests for proposal shall apply: National Bureau of Standards Handbook H28 Screw-Thread Standards for Federal Services (Application for copies should be addressed to the Superintendent of Documents, U.S. .Government Printing Office, Washington, D.C. 20402). 3 Provided by IHSNot for
11、 ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-1-95932 53 4977706 0307216 4 m AMs 4650 AMs 5643 AMs 5734 AMs 5736 AMs 6370 (Applications of Automotive Copper - Beryllium Alloy Bars, Rods, and Forgings Steel Bars, Forgings, Tubing, and Rings, Corrosion Resistant Steel
12、 Bars, Forgings, and Tubing, Corrosion and Heat Resistant Steel, Bars, Forgings Steel, Bars, Forgings. for copies should be addressed to the Society Engineers, Inc., Two Pennsylvania Plaza, New York, New York 10001). American Society of Testing and Materials (ASTM) Publications E10 - Brinell Hardnes
13、s of Metallic Materials, Test for (Applications for copies should be addressed to the American . . Society for Testing and Materials, 1916 Race Street, . -. Philadelphia, Pennsylvania 19103). American National Standards Institute, Incorporated ANSI B46.1 - Surface Texture (Surface Roughness, Wavines
14、s and Lay) . -. .I (Applications for copies should be addressed to the American National Standards, Incorporated, 1430 Broadway, New York, New York 10018) . *. “Technical society and technical association specifications are distributed among technical groups and using Federal agencies.“ generally av
15、ailable from reference libraries. They are also 3 REQUIREMENTS 3.1 Specification sheets. The individual item requirements shall be as specified herein and in accordance with the applicable specification. sheets. -: Provided by IHSNot for ResaleNo reproduction or networking permitted without license
16、from IHS-,-,-. .- . “ -.L -. . _S -2 .i 3. 2 Material 3.2.1 Carbon steel. Unless otherwise specified, (see 6.2) ,- inserts made of carbon steel shall conform to the requirements of Federal Standard No. 66, composition 1117. 3.2.2 Alloy steel. Unless otherwise specified, (see 6.2) , .inserts may be m
17、ade of alloy steel conforming to the require- ments of AMs 6370, composition 4130. - 3.2.3 Corrosion-resistant steel. When specified in the contract or order, inserts shall be made of corrosion-resistant steel conforming to the requirements of Federal Standard No. 66, comDosition 303; or AMs 5734 or
18、 AMs 5736, composition A286; or .- L AMS 5643, composition 17-4 PH. 3.2.4 Beryllium copper. When specified in the contract or -. order, inserts shall be made of beryllium copper conforming to the requirements of AMs 4650. specified herein. 3.3.1 Cadmium platinq. Carbon steel, alloy steel, and beryll
19、ium copper inserts shall be cadmium plated in accordance with QQ-P-416, Type II, Class 2 or as specified in the applicable specification sheet. 3.3.2 Passivation. Corrosion-resistant steel inserts shall be pass.ivated in accordance with QQ-P-35 or as specified in the. . applicable specification shee
20、t. 3-3.3 Silver platinq. Inserts made of corrosion-resistant steel, shall be silver plated in accordance with QQ-S-365, Type . II, Grade B, .O002 minimum thickness, as specified in the .applicable specification sheet. 3.4 Lubrication. Inserts with self-lockiny internal threads shall be solid film lu
21、bricated as specified in the app.1icabl;e specification sheet. The lubricant shall conform to MIL-L-8937 - and- be examined per 4-5.5. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-1-45932 3.5 Construction. The inserts shall be of metal, one
22、piece, with an integral metallic or non-metallic locking device as specified on the applicable specification sheets. 3.6 Desiqn, dimensions, and tolerances. Inserts shall be in accordance with the design, dimensions, and tolerances as specified on the applicable specification sheets. These dimen- si
23、ons and tolerances shall apply after the protective plating 01: surface treatment and prior to the application of the lubri- cant as specified in 3.4. 3.7 Threads_. Unless otherwise specified (see 6.2) the insert internal and external threads.shal1 be right-hand. 3.7.1 Internal threads. Internal thr
24、eads shall conform to Handbook H28, Part I, MIL-S-7742, or MIL-S-8879. Sizes and c dimensions shall be as specified on the applicable specification. Thread gaging shall be performed after plating and prior to the application of the lubricant where applicable. When an internal locking feature is empl
25、oyed, the GO plug gage shall enter a minimum of 3/4 turn before engagement of the internal locking device. 3.7.2 External threads. External threads shall be in accordance with Handbook H28, Part I, except minor diameters shall be as specified on the applicable Specification. 3.7.3 Lead threads. Exte
26、rnal lead threads shall not exceed ._ two pitches, including chamfer. 3.7.4 Thread forming. Threads may be produced either by machining, grinding, or fully formed by a single rolling process prior to plating. 3.7.5 Concentricity. The internal thread pitch diameter shall be concentric with the extern
27、al thread pitch diameter within .O06 TIR when tested as specified in 4.5.3. - -3.7.6 Thread lockinq feature. The locking feature may be either metallic or non-metallic and may be installed in a location as described on the applicable specification sheet. The non- metallic -locking feature- shall be
28、in accordance with L-P-410. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-1-45932 When tne insert is properly installed in the 93rent material, it will provide a locking torque with.a mating screw or bolt that is within the limits of Table I
29、whkn mkested as specified in 4.6.1. .-. Inserts shall not be subject to self-ldcking tests after test- ing as specified in 4.6.2, 4.6.3, or 4.6.4. . TABLE I “ INTEmAL THREAD SELF-LOCKING TORQUE (IN INCH-POUNDS) INSERT IdTERNAL .- . THREZJD TORQUE TORQUE FINE OR COARSE . MIN BREAKAWAY MAX LOCKING NOM
30、INAL SIZE .- 7 -. -.:S :. i .i “. . - 5 “ F _. -. . “ e-2r . -.- quirements specified herein, unless disapproved by the -Govern- *? .- . . “ 1 - -. - i. . “ v. S_ -. -. -. ._ . . 4.3 Acceptance tests. Test methods for acceptance shall , . : . i *. i if. consist of examination and tests. _- :r . . -I
31、-. . 4.4.-1 E. A lot shall consist of finished inserts which . are of the same material, type, size, fabricated by the same process, and produced as one continuous run or order, or part . thereof, and submitted for acceptance inspection at the same time. 4-4.2 Samplinq for test materials. I 4.4.2.1
32、Test blocks. Test blocks shall be -fabricated as .specified in Figures 2 and 3 as applicable. Larger test blocks for multiple testing of inserts are permissible except for test of 4.6.2 and 4.6.3. 4.4.2.2 Test specimens. Test specimens taken in accordance with 4.4.4 shall be installed in accordance
33、with the applicable . specification sheets in test blocks as specified in 4.4.2.1. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-LAPS AND SEAMS NOT PERMISSIBLE MAJOR DIAMETER PITCH DIAMETER MINOR DIAMETER . PERMISSIBLE SURFACE IRREGULARITIES MAJOR
34、DIAMETER PITCH DIAMETER MINOR DIAMETER PERMISSIBLE LAPS AND SEAMS J W“ MAJOR DIAMETER PITCH DIAMETER MINOR DIAMETER NOT MORE THAN 20% OF BASIC THREAD HEIGHT FIGURE 1 15 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-1-45932 4.4.2.3 Test bolts an
35、d screws. Bolts and screws for use in all tests shall have class 3A threads. 4.4.2.3.1 Bolts and screws used for testing as specified in 4.6.2, 4.6,3, and 4.6.4 shall be heat treated to 160,000 PSI minimum tensile strength and shall be cadmium plated.per QQ-P-416, Type II, Class 2. 4.4.2.3.2 Bolts a
36、nd screws used for teses as specified in 4.6.1-shall be of corrosion-resistant steel and shall be passi- inserts. Cadmium plated noncorrosion-resistant steel bolts shall beuced for testing carbon steel and alloy steel inserts. .vated per QQ-P-35 for testing with corrosion-resistant steel 4.4.3 Sampl
37、inq for examination. A random sample of inserts shall be taken from each lot in accordance with MIL-STD-105 at Inspection Level II. The Acceptance Quality Levels (AQL) shall . be is specified in Table VIII. 4.4.4 Samplins for test. Sampling for test of inserts shall be .in accordance with MIL-STD-10
38、5, Inspection Level S-l. The Acceptance Quality Level (AQL) shall be 1.5% defective. . 4.4.5 Sampling for protective finishes. Sampling for test Of protective finishes shall be in accordance with the applicable finish specification of 3.3.1, 3.3.2, and 3.3.3. 4.4.6 Samplinq for packaqinq and packinq
39、. Sampling for packaging and packing shall be in accordance yith PPP-3-1581. t 4.5 Examination. 4.5.1 External threads. External threads shall be checked for thread form per Handbook H28, Screw-Thread Standards for Federal Services, and minor diameter dimensions per applicable specification. Pitch d
40、iameters are to be inspected using the three (3) wire or equivalent method. 1 i- 4.5.2 Internal threads. Internal threads shall be checked in accordance with Handbook H28 where applicable, with minor diameters as specified in MSL-S-8879 or as specified in applicable specification sheet. 16 Provided
41、by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-flIL-I-LI5732 53 7777706 0107229 2 W MIL-1-45932 4.5.3 Concentricity. The concentricity of the int3rnal and external thread pitch diameters shall be checked following examination per 4.5.1 and 4.5.2.: The intern
42、al thread pitch diameter shall be concentric wit:? the extemal thread pitch diameter per 3.7.5. Method used for checking concentricity is optional. 4.5.4 Finish, dimensions, and surface rouqhness. Finish, dimensions, and surface roughness shall be checked visually and by means of applicable gages. 4
43、.5.5 Lubrication. The solid film lubricant coating shall be examined visually and microscopically at a magnification of 1OX for uniformity in color, smoothness, and thickness, arid evidence of cracks, bubbles, blisters, runs, foreign matter, .grit,- separation of ingredients, and other surface imper
44、fections. 4.5.6 Classification of defects. The classification of defects and the Acceptable Quality Level (AQL) for inserts shall be in accordance with Table VIII. Any insert containing one or number of defective units which will reject a lot shall be in accordance with Tables I and IV-A of MIL-STD-
45、105. -_ more defects shall be considered a defective unit. The total Categories Critical Major 101 102 103 104 105 106 107 -108 Minor 201 Defects TABLE VI11 - Classification of Defects m None AQL = 1.5 per cent defective Material (3.2) Lubrication (3.4) Description and dimensions (3.6) Thread size a
46、nd form (3.7.1 . shall be cause for rejection. When visual inspection discloses -a .- . shall be penetrant inspected in accordance wikh MIL-1-6866. .: .- 4.6 Test methods. 1 -. -:z . 4.6.1 Internal thread self-lockinq test. Test specimens -. .e .- . installed in test blocks (Figure 2) as specified,
47、shall be used :i. . . . for the torque -testing of the internal locking feature when -? .- . - applicable. . . . -. :-.i .- 4.6.1.1 Screw lockinq torque. The locking torque shall consist of a 15-cycle room temperature torque test, using test blocks conforming to Figure 2 and screws conforming to 4.4
48、.2.3.2 with sufficient thread length to extend beyond the locking -.feature a minimum of two (2) pitches (including bolt thread chamfer). A new bolt or screw and a new test specimen shall be used for each complete 15-cycle test. Bolts and screws must assemble freely, with the-,f$ngers up to the lock
49、ing feature. The bolt or screw shall be engaged or disengaged from the assem- cycles without axial load on the insert. The test shall be run at a rate .slow enough to yield a dependable measure of torque and avoid heating of the bolt. A bolt shall be considered fully installed when two threads extend past the endof the locking feature of the insert; the removal cycle shall be con
