1、DOD-I-63276A 21 October 1983 SUPERSEDING DOD-1-63276 26 September 1977 MILITARY SPECIFICATION INSERT, SCREW THREAD, LOCKED IN, RING LOCKED, SERRATED, METRIC, GENERAL SPECIFICATION FOR This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Sc
2、ope. This specification covers metric .locked in, screw thread and without metallic internal thread locking feature. The method of the insert is by means of a serrated collar and an accessory lockring serrations installed within the parent material to prevent rotation. lockring is also covered herei
3、n. 2. APPLICABLE DOCUMENTS 2.1 Government documents. inserts with ocking in The accessory with matching 2.1.1 Specifications, standards, and handbooks. Unless otherwise specified, the following specifications, standards, and handbooks of the issue listed in that issue of the Department of Defense In
4、dex of Specifications and Standards (DoDISS) specified in the solicitation, form a part of this specification to the extent specified herein. SPECIFICATIONS FEDERAL QQ-A-225/6 - Aluminum Alloy Bar, Rod and Wire; Rolled, Drawn or Cold QQ-A-250/6 - Aluminum Alloy 5083, Plate and Sheet QQ-P-416 - Plati
5、ng, Cadmium (Electrodeposited) PPP-H-1581 - Hardware (Fasteners and Related items), Packaging Of Finished, 2024 Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document, should be addressed to: Commander, Armamept ResearcK and
6、Davelo ment Center, US Army Armament, Munitions and Chemical Command, AdtelIV 1 Table IV I T;d - 2/ multiplied by- 1550 MP either of the members in an unassembled condition. Shear engagement area is the assembled dimensional value for the overall It does not represent a dimension of - Provided by IH
7、SNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DOD-I-6327bA 53 W 7777706 OL07L20 L W DOD-I-63276A Internal Thread Size TABLE V. Resistance to pull-out, insert external thread Minimum Resistance to Pull-out (kN) - i/ COL 1 COL 2 COL 3 -100 -200 -300 Numbers Number
8、 s Number s Internal Thread Size MJ5xO. 8 M J6x 1 MJ7xl MJ8xl the removal cycle shall be considered complete when the locking feature is disengaged. 4.7.2.1 Maximum locking torque test. Maximum locking torque shall be the not exceed the applicable values specified in Table I in accordance with the r
9、equirement of 3.4.2.1. the first, seventh and fifteenth installation cycle. A bolt or screw shall be considered fully installed maximum torque value encountered on any installatian or removal cycle and shall Maximum locking torque readings shall be recorded on 4.7.2.2 Minimum breakaway torque test.
10、minimum torque required to start removal of the bolt or screw from a fixed position located between the first 1/4 turn to 1 turn of the removal cycle. Minimum breakaway torque readings shall be recorded at the start of the first, seventh, and fifteenth removal cycles. The torque for any cycle shall
11、not be less than the applicable values specified in Table I in accordance with the require- ments of 3.4.2.1. Minimum breakaway torque shall be the 4.7.3 Tensile strength test. Sample inserts shall be installed in test blocks in accordance with figure 3 and 4.1.3. The test bolt or screw shall assemb
12、le freely into the insert with finger torque prior to engaging the locking feature. The bolt or screw thread shall be of sufficient length to fully engage the entire length of the insert internal thread when the sample inserts are installed in test fixture in accordance with figure 4. The bushing an
13、d test block clearance holes in the upper and lower yokes (see figure 4) shall have a free fit not in excess of 1.5 mm greater than the bushing and test block diameters. The test bolt or screw clearance hole in the upper bushing (see figure 4) shall be 0.13 to 0.4 mm diameter larger than the nominal
14、 diameter of the test bolt or screw. The bolt clearance hole in lower yoke shall have a diameter of 1 1/2 x the nominal insert external thread diametertO.4. The applicable axial tensile I.oad value specified in table III shall be applied to the assembly and sample inserts shall meet the requirements
15、 of 3.5.1. In the event of bolt failure below specified axial load value, the test shall be repeated until the axial load value af the insert is reached or exceeded. Rate of loading shall not exceed 700 MPa per minute based on the shank diameter area of the bolt. 4.7.4 Resistance to pull-out test. S
16、ample inserts shall be installed in test blocks in accordance with figure 3 and 4.1.3 to meet the requirements of 3.5.2. The minimum single shear strength of the test block material, shall be determined by means of double shear tests of coupons taken from the material from which the test blocks are
17、fabricated. The procedure shall be the same as 4.7.3 except, to demonstrate the average shear engagement area, an axial load of sufficient mag- nitude to produce failure (pull-out) shall. be applied to the assembly. The axial load test result shall be adjusted for test block shear strength as follow
18、s: The product of the load test results (N) and the ratio of the i70 MPa to the actual minimum shear strength shall be used as the resistance to pull-out (N). The mean (arithmetical average) value, as determined hy five or more tests, shall meet or exceed the values Specified in table il in accordan
19、ce with 3.5.2. In the event of bolt failure blow ttic applicable strength rating, the test shall be repeated until the piill-oiit strength of the irisert is reached or exceeded. Rate of loading 18 -.=_ _ - - - - - Provided by IHSNot for ResaleNo reproduction or networking permitted without license f
20、rom IHS-,-,-o L -0 O DOD-I-6327bA 53 777770b OLO7L32 DOD-I-63276A Bushing clearance - Bolt nominal dia plus O. 25mr0.13 Bushing -, r Upper - Yoke 1.5 Nom insert ext thd dia kO.4mm LLower Yoke Tes t B1 o c k Free Fit spacer O. 13-0.4h 1.5 Nom insert ext diametral clearance thd dia 20.4mm on ID : 5. R
21、atational resistance test fixture - . - .- . .- - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DOD-I-6327bA 53 9 777790b 0109134 1 DOD-I-63276A - shall not exceed 700 MPa per minute based on the shank diameter area of the bolt. Whenever the pull-o
22、ut values exceed the tensile strength of the.test bolt,.or the test equipment, it is permissible to use lower shear strength materials (100 MPa approx.) in lieu of specified test block materials. taken from the lower shear strength test blocks shall be performed and- the resultant shear strength use
23、d to adjust the test results as stated above; Double shear tests on coupons 4.7.5 Rotational resistance test. Sample inserts shall be-installed in test blocks in accordance with figure 3 and 4.1.3 and utilizing a test assembly as illustrated in figure 5. With the forward side face of the insert inst
24、alled in accordance with 4.1.3, the far side of the insert.-shall extend a distance approximately equal to one (1) external thread pitch past-the:$ar.sde.o the test block allowing it to fit into the counterbore of the bushing. The insert shall fit into the bushing counterbore sufficiently close to p
25、revent it from expanding under pressure. specified in 4.1.3.2.1 shall enter the insert from the back side (opposite normal entry). at applicable values below those specified in table VI in accordance with the requirements of 3.5.3 shall be cause for rejection. 5. PACKAGING 5.1 Packaging requirements
26、. A test bolt or screw of 1800 MPa minimum tensile strength as The test bolt or screw shall be torqued in a clockwise direction. Failure The requirements for packaging shall be in accord- ance with PPP-H-1581 (See 6.2). . 6. NOTES 6.1 Intended use. Inserts covered by this specification are intended
27、primarily in equipments to protect and strengthen internal threads in materials with low shear strength, especially in areas where repeated assembly and disassembly is required. Lockrings covered by this specification are designed with external and internal serrations which are used as a locking dev
28、ice to preveiit rotation of DOD-1-63276 metric inserts as well as DOD-S-63275 metric studs when required. 6.2 Ordering data. Acquisition documents should specify the following: a. Title, number and date of this specification and the applicable specifi- cation sheet. b . Applicable specification shee
29、t part number (See 3.1). c. Level (degree) of protect ion, in accordance with PPP-H-1581 , ordering data (See 5.1). 6.3 Definitions. 6.3.1 Crack. - A crack is defined as a clean crystalline break passing through the grain or grain boundary without .the inclusion of foreign elements. 21 Provided by I
30、HSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DOD-I-63276A. 6.3.2 a. fins or sharp corners, and then rolling or forging, but not welding them into the sur face. A surface defect appearing as a seam caused by folding over metal, 6.3.3 Seam. closed by rolling or
31、forging mechanically, but not united. An elongated discontinuity caused by a defect, which has been 6.3.4 Inclusions. and silicates, which are mechanically held In the steel during solidification. 6.4 Changes from previous issue. Asterisks are not used in this revision to identify changes with respe
32、ct to the previous issue due to extensiveness of Particles of non-uietallic inpurities such as oxides , sulfides the changes, Custodians : Army - AR Navy - OS Air Force - 99 Review activities : Air Force - 11 Amy - AV NSA - NS DLA - IS. . . User activities: Army - ME, AT Navy - MC . b.e.6. OOVERNMENT PRINTING OFFICE: 03-70-040/5480 Preparing activity : Army - AR (Project 5340-1463) 22 - - - , 7 - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
