1、.I MIL-I -45916B I 24 Jul -1975 25 April 1969 * MIL-I-45916A MILITARY SPECIFICATION INSERT, SCREW THREAD - THREAD CUTTING AND THREAD FORMING This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE This Specification covers solid bushing screw thr
2、ead cutting and thread forming external threads. 1.2 following Classification. Inserts shall be furnished in the types, as specffied (see 6.2). Type I - Thread cutting, regular wall. Type IA- Thread cutting, thin wall. Type II- Thread forming. 2. APPLICABLE DOCUMENTS 2.1 The following documents, of
3、the issue in effect on date of invitation for bids or request for proposal, form a part of this specification to the extent specified herein, SPECIFIC ATIONS Federal QQ-A-225/6 QQ-A-250/6 Q.Q-A -601 QQ-B-626 QQ-P-35 QQ-P -4 16 PPP -H-i58i - Aluminum Alloy Bar, Rod, and Wire; Rolled, - Aluminum Alloy
4、 5083, Plate and Sheet. - Aluminum Alloy Sand Castings. - Brass, Leaded and Nonleaded: Rod, Shapes, Edges Forgin?s Bar , and Strip). - Passivation Treatments For Corrosion-Resisting Steel. - Plating, Cadmium (Electrodeposited). - Hardware (Fasteners and Related Items), Pack- aging and Packing for Sh
5、ipment and Storage of. Drawn, or Cold Finished, 2024. and Flat Products With Finished FSC 5340 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-I-459LbB 53 W 9999906 0429132 I MIL-I -45916B Mi lit ary MIL-F-495 - Finish, Chemical, Black, for Coppe
6、r Alloys. 1-1-6866 - Inspection, Penetrant Method of 1-1-6868 - Inspection Process, Magnetic Particle. MIL-A-8625 - Anodic Coatings, for Aluminum and Aluminum Alloys. MIL-L-8937 - Lubricant, Solid Film, Heat Cured, STANDARDS Fed era 1 Fed. Std. No. 66 - Steel, Chemical Composition and Hard- Fed. Tes
7、t Method Std. No. 151 - Metals; Test Methods ena bi li t y Military MIL-STD-105 - Sampling Procedures and Tables for Inspection MS35914 - Insert, Screw Thread-Thread Cutting. MS51836 - Insert, Screw Thread-Thread Forming. 51837 - Insert, Screw Thread-Thread Forming, Hole by Attributes. Dimensions fo
8、r and Installation of. (Copies of specifications, standards, drawings and publica- tions required by suppliers in connection with specific procure- ment functions should be obtained from the procuring activity or as directed by the contracting officer.) 2.2 Other publications. The following document
9、s form a part of this specification to the extent specified herein. less otherwise indicated, the issue in effect on date of invita- tion for bids or request for proposal shall apply, Un- American National Standards Institute (ANSI) Standard: ANSI B46,i - Surface Texture (Application for copies shou
10、ld be addressed to the American National Standards Institute, i430 Broadway, New York, N.Y. , 10018,) National Bureau of Standards Handbook: 28 - Part I - Screw Thread Standards for Federal Services (Application for copies should be addressed to the Superin- tendent of Documents, U.S. Government Pri
11、nting Office, Washington, D.C, 20402:) 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-i MIL-I-4591bB 53 m 9999906 0429333 T W MIL-I-45916B American Society for Testing and Materials (ASTM) Standard: ASTM E10 - Brinell Hardness of Metallic Material
12、s. ASTM E18 - Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials. (Application for copies should be addressed to the American Society for Testing and Materials, i916 Race Street, Philadelphia PA, 19103.) 3 . REQUIREMENTS 3.1 Material. Unless otherwise specified (see 6.2), 3.1.
13、1 Carbon steel. Carbon steel shall be in accordance inserts shall b e made of the materials specified herein. with Fed. Std. No. 66 , as specified in MS35914 and MS51836. 3.1.2 Corrosion-resisting steel. Corrosion-resisting steel shall be type 303 in accordance with Fed. Std. No. 66, as specified in
14、 MS35914 and MS51836. 3.1.3 Brass. Brass shall be in accordance with QQ-B-626, as specifiedinMS51836. 3.2 Protective coating. When specified (see 6.2), inserts 3.2.1 Cadmium plating. Carbon steel inserts shall be cad- shall be fu-f the following protective finishes. mium plated In accordance with QQ
15、-P-416, Type II, Class 3. 3.2.2 Passivation. Corrosion-resq.sting steel inserts shall be passivated in accordance with QQ-P-35. 3.2.3 Black chemical. Brass inserts shall have a black chemical-finlsh in accordance with MIL-F-495. 3.3 Lubrication. Type II inserts with self-locking inter- na1 threads s
16、hall b e solid film lubricated. The lubricant shall be in accordance with MIL-L-8937. inserts shall be as specified in MS35914 and MS51836. and tolerances shall apply after application of protective coat- ing and prior to application of lubricant. 3.4 Dimensions, The design, dimensions and tolerance
17、s of Dimensions 35 Thread locking feature. The locking element for Type 1 inserts shall b e nylon. The insert and internal thread lock- ing devices for Type II inserts shall be an integral, all metal 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
18、_ MIL-I-459LbB 53 m 77994Ob 0429134 L m I hom. Size Internal Thread v P , O86 -64 *. 138-40 *.164-36 .190-32 .25O-28 ,3125-24 .375 -24 * .4375 -20 ,500-20 * .5625 -i8 .625-18 .750-16 *. 112-48 unit. Threads in the area of the locking feature on Type II in- serts may be displaced or deformed, The ins
19、talled insert shall provide a locking torque with the mating screw or bolt within the limits of Table I. TABLE I Internal Thread Self-Locking Torque (Inch-Pounds) Fine Threads I Maximum Locking Torque 2.5 5 10 15 18 30 60 80 100 150 200 300 400 Minimum Breakaway Torque *SC * 1.0 1.5 2.0 3.5 6.5 9.5
20、14.0 18.0 24.0 32.0 50.0 Coarse Threads Nom. Size Interna 1 Thread .086-56 .112-40 138-32 .164-32 ,250-20 .3125-18 375-16 * 4375 -14 e 500-13 * ,5625 -12 750 -10 ,190-24 ,625-11 qaximum Locking Porque 2.5 5 10 15 18 30 60 80 100 150 200 300 400 Minimum Breakaway Torque * * 1.0 1.5 2.0 4.5 7.5 12.0 1
21、6.5 24.0 30.0 40.0 60.0 * Inactive for new design. * Some indication of torque. 3.6 Threads. All threads shall be right hand. 3.6.1 Internal threads. Internal threads shall be in accordance w3th H andbook H28 , Part I, and as specifled in MS35914 and MS51836. Thread gaging shall be performed after a
22、pplication of protective coating and prior to application of the lubricant. When a locking feature is employed, the GO plug gage shall enter a minimum of 3/4 turn before engaging the locking device. the application ofa lubricant on Type II Inserts prevents the use of standard gages, the inserts shal
23、l permit a minimum free rotational bolt thread engagement of 3/4 turn before enggging the 1ocking.devic.e. ial form to permit a self-threading action when the insert is installed. External threads shall be as specified on MS35914 and MS51836. When 3.6.2 External threads. External threads shall be a
24、spec- A 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-t MIL-I-4571bB 53 W 777770b 0427335 3 W i MIL-I-45916B 3.6.3 Lead threads. Internal 1ead.threads shall not ex- ceed two pitches, including chamfer, 3.6.4 Concentricity. For Types I and IA, the
25、 internal thread pitch diameter shaT1 be concentric with the external pitch diameter within 0.004 TIR for sizes up to and including 0.190, and 0.006 TIR for sizes larger than 0.190 internal thread. For Type II inserts, the internal thread pitch dia- meter shall be concentric with the external pitch
26、diameter within 0.006 TIR. 3.7 Surface roughness. The surface roughness of the inserts prior to protective coating shall not exceed 125 micro-inches in accordance with ANSIB46.1. 3.8 Mechanical properties . 3.8.1 Pullout resistance. Type I and II inserts shall withstand the pullout strengthsspecifie
27、d in Table II with no failure of either the insert or parent material and shall have no elongation in excess of 2%. 3.8.1.2 Type IA inserts shall withstand 90% of the Type I and II pullout strengths specified in Table II. 3.8.2 Rotational resistance (torque-out). Type I and II inserts shall withstan
28、d the torque-out strengths specified in Table II with no failure of either the insert or parent material. 3.8.2.1 Type IA inserts shall withstand 90% of the Type I and II torque-out strengths specified in Table II. 3.8.3 Hardness, Inserts shall have a hardness range as specified inxmand MS51836. 3.9
29、 Discontinuities. Inserts shall cnntain no discontin- uities which exceed the fllowing limitations. When visual inspection discloses discontinuities which show cause for further examination, magnetic particle or pene- trant inspection, as applicable, shall be performed. 3.9.1 Cracks. Inserts shall b
30、e free from cracks in any d irec t Ion ormon. 3.9.2 Laps and seams (Figure i). Threads shall have no laps or seams at the root or along the flanks. Laps and seams are permissible at the crest and on the flanks outside the pitch diameter, but shall not exceed 25% of the basic thread depth. 5 Provided
31、 by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-I-457LbB 53 7777706 0427336 5 FULLOUT RFSISTANCE AM RESISTANCE TYPE I NOM SIZE INSERT FULLOUT TORQUE-OUT INTERNAI, LENGTH STRENGTH STRENGTH THREAD (INCH) (LBS) (INCH-LBS) 5 4 . i88 990 .o86 ,156 790 .125 5
32、95 3 .234 1,530 8 .112 .187 1,225 6 .156 920 5 .138 .218 1,910 10 .187 1,435 8 .328 3,300 18 . i64 .250 2,640 i4 190 ,296 3,460 24 .250 375 5,680 32 312 4,260 24 .562 10,400 75 .3E5 -469 8 Y 320 60 375 6,240 45 A87 15,790 120 375 362 12,630 i04 e437 9,475 72 .4375 .781 20,400 160 .g6 26,800 20 500 .
33、750 21,440 160 .5 the removal cycle shall be considered complete when the locking feature is disengaged. shall be the maximum torque value encountered on any installa- tion or remoyal cycle, and shall not exceed values specified in Table I. Maximum locking torque readings shall be recorded on the fi
34、rst, seventh and fifteenth installation cycle. 4.6.2.1 Screw-locking torque. The torque test shall con- 4.6.2.2 Maximum locking torque. Maximum locking torque 10 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-b - MIL-I-45716B 53 7777906 0427141 7 M
35、MIL-I-45916B r 4.6.2.3 Minimum breakaway torque. Minimum breakaway tor- que shall be the minimum torque required to start removal of the screw or bolt from a fixed position during the first one-half turn of the removal cycle. The torque value for any cycle .shall not be less than the applicable valu
36、e specified in Table I. Minimum breakaway torque reading shall be recorded at the start of the first, seventh and fifteenth removal cycle. 4.6.3 Pullout resistance. Test specimens installed into test blocks Figure 21, as specified in 4.6.1 shall be used for the pullout resistance test. The test bolt
37、 shall assemble free- ly into the insert, prior to engaging the self-locking device, with finger torque and shall be of sufficient length to extend through the insert a minimum of two pitches (including bolt thread chamfer.) The bushing and test block clearance holes in the upper and lower yokes (Fi
38、gure 4) shall have a free fit not in excess of 0.060 inch greater than the bushing and test block diameters. The bolt clearance hole in the upper bushing (Figure 4) shall be 0.005 to 0.015 inch diameter larger than the nominal diameter of the test bolt. The minimum pullout strength specified in Tabl
39、e II shall then be applied to the assembly. Failure of the insert to stay in the test block or failure of the internal thread shall not occur below the loads- specified in Table II. If bolt failure occurs below the ap- plicable pullout strength rating, the test shall be repeated until the minimum pu
40、llout strength of the insert is exceeded. Rate of loading shall not exceed 100,000 PSI per minute per square inch based on the shank diameter area of the bolt. 4.6.4 Rotational resistance. Test specimens installed into test blocks (Figure 31, as specified in 4.6.1, shall be used for the rotational r
41、esistance test. When the near side face of the insert is installed in accordance with MS35914 or MS51837, the far side of the insert shall extend a distance of one and one-half to two external thread pitches of the in- sert past the far side of the test block allowing it to fit into the countersink
42、of the bushing. The test bolt or screw specified in 4.4.2 shall enter the insert from the back side (opposite normal entry), and shall be torqued in a clockwise direction. The test assembly shall be as illustrated in Figure 5. Torque-out strengths, with no axial load on the insert, shall not be less
43、 than the values specified in Table II. shall be hardness tested in accordance with ASTM E10 or E18 to verify conformance with 3.8.3. 4.6.5 Hardness. Each insert taken as specified in 4.3.2 11 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-c NIL-I-L
44、B 53 W 477770 oY271L12 0 MIL-I -45916B mill certificate specifying the chemical composition of the material used in the manufacture of the inserts. When speci- fied (see 6.2), chemical analysis shall be in accordance with Method 111.2 or 112,2 of Fed, Test Method Std. 151. In case of dispute, Method
45、 112.2 shall apply. tive coatings shall be in accordance with the applicable speci- fication of 3.2. B 4.7 Chemical analysis, The supplier shall furnish a 4,8 Protective coating. Examination and test of protec- 4.9 Preparation for delivery. Examination and test of preparation for delivery shall be i
46、n accordance with PPP-H-1581, to verify conformance with Section 5. 5 . PREPARATION FOR DELIVERY 5.1 Packaging and packing. Packaging shall be Level A or C and packing shall be level A B or C in accordance with PPP-H-1581, as specified (see .2). 6, NOTES 6.i Intended use. Inserts covered by this spe
47、cification d are intended as general purpose fasteners with self -threading external threads of the following types: to provide strong wear and thread resistance in soft, weak metals, cast iron, mild steel, plastics and wood. Type I and IA inserts are designed to tap their own threads Type II insert
48、s are designed for use in yielding materials such as aluminum and magnesium alloys, and plastics. 6.2 Ordering data. Procurement documents should specify the following: Title, number and date of this specification. Type (1.2). Applicable MS part number. Material (3.1). Protective coating (3.2). Chem
49、ical analysis, when required (4.7). Selection of applicable level of packaging and packing (5.1). 12 6.3 Definitions. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4 PlIL-I-459LhB 53 9999906 0429343 2 MIL-I -45916B 6.3.1 Crack. A crack is a clean crystalline break pass- ing through wain or grain boundary without the inclusion of foreign ele
