1、m Ob 1983898 285 m DOD-B-70331 (AR) 21 April 193 MILITARY SPECIIEICATION EILT, SELF-IWKING, HEXAGON HEAD, STEEL, METRIC, G3NiBAL SPECIFICATION FOR This specification is approved for use by US Arqy Armament Research and Development Command Department of the Am, and is available for use by all Departm
2、ents and Agencies of the Department of Defense. 1. scorn 1.1 SC0 e. This specification covers two types of hexagon head, self- locking E+- 01 s, property class 10.9 steel, with metric dimensions. 1.2 Classification. Bolts shall be of the following wes as specified on the applicable specification she
3、ets (see 6.2). !Ty-pe B - Standard Hex Head Type BH - Larger Hex Head 2. APPLICABLE DOCXJPENTS 2.1 Government documents. 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 Departm
4、ent of Defense Index of Specifications and Standards (DODISS) specified in the solicitation form a part of this specification to the extent specified herein. SPECIFICATIONS QQ-P-416 - Plating, Cadmium (Electrodeposited) PPP-H-1581 - Hardware (Fasteners and Related Items), Padcaging of Beneficial com
5、ments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Conmiander, U.S. Av Armament Research and Development Command, ATTN: DRDAR-TST-S, Dover, W, 07801 by using the self+ddressed Standardization Docwrient Improveme
6、nt Proposal (DD Form 1426) appearing at the end of this document or bv letter. Licensed by Information Handling ServicesProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-9999906 1983899 111 W DOD-E-70771 (AR) MILITARY DOD-ions required by manufacturers
7、 in connection with specific acquisioion functions should be ohtained from the contractinp activitv or as directed by the contracting officer. ) 2.2 Other publications. The followinp documents form a pRrt of this specification to the extent specified herein. which are indicated as DOD adopted shall
8、be the issue listed in the current DODISS and the supplement thereto, it applicable. SAF: 51199 (10.9) - Nechmical end Material Requirements or Metric The issues of +he doaxments Ex%ernallv mhrear3ed Sfeel Frsteners Eneineers, Inc., 400 Commonwealth Drive, Warrendale, PA lcKic)6. ) (Application for
9、copies shuuld be addressed to the Socipty of Automotive 2.3 &der of precedence. In the event. of a confl i ct between the text of this swcifimtion md the references cited herein, the text of thiFi specification shall take precedence. 7.1 Ppecifica$ion sheets. “he individus1 item requiremerts shq11 b
10、e as specified herein and in accordnirice with the mplicable specification sheet. the event of any conflict between the requirements of this specificstion and the specification sheet, the atter shall govern. in 3.2 51139 Materiai. The boit8 shall conform to the rnateria.1 commition of SAE Provided b
11、y IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-9979906 1983700 763 = DOD-E7033 1 (AR) 3.3 Design. The bolts shall conform to the design, dimensions, and tolerances specified on specification sheets. 3.4 Finish. The protective finish of the bolts when specifie
12、d in the applicable specification sheet shall be as follows (see 4.3.4). 3.4.1 Cadmium plate. Bolts shall be cadmium plated in accordance with QQ-P-416, type II, class 2. Plating thickness shall be 7.6pm (micrometers) thick. 3.4.2 Phosphate coating. Bolts shall be phosphate coated in accordance with
13、 DOD-P-16232, type Z, class 2. (micrometers) thick. Coating thickness shall be 5 to 15 pm 3.4.3 Hydrogen embrittlement. Cadmium plated bolts shall be subjected to an embrittlement relief treatment in accordance with QQ-P-416 as soon as possible after plating to minimize the resulting embrittlement.
14、3.5 Mechanical properties. The mechanical properties of the bolts shall meet the requirements as specified in table I (see 4.3.2 and 4.2.4). Nom thread dia and thread pitch M6x 1 M8x1.25 M10xl.5 M12x1.75 M14x2 M16x2 M20x2.5 M24x3 M30x3.5 TABLE I. Mechanical properties. Stress area 2 mm 20.1 36.6 58
15、.O 84.3 115.0 157 .O 245 .O 561 .O 353 *O Proof load kN 16.7 30.4 48.1 70 .O 95.4 130 .O 203 .O 293 .O 466 .O Tensile strength min k4 20.9 38.1 60.3 87.7 120.0 163 .O 255 .O 367. O 583.0 3.5.1 Hardness. Bolts shall have a hardness of 33-39HRC. 3.6 lreads. Threads shall be standard course pitch “M“ p
16、rofile, tolerance class 6g after plating, as specified on the applicable specification sheets and in accordance with FED-STD-H28/21. Threads shall be formed by rolling process. 3.7 Head. 3.7.1 Head taper. The taper of the head (angle between one side or sides of the head and the axis of the fastener
17、) shall not exceed 2 degrees. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DOILS70331 (AR) Nominal. thread diameter M6x1 .o0 MEiX1 .25 M1 OX1 .50 M12x1 .75 M14E M16X2 MOX.5 M24X3 mon3.5 7.7.2 Bearing surface. The bearing surface of the head shal
18、l be at ri&t angles to the axis of the body within 2 degrees for bolt sizes up to and including 24 mm and within 1 degree for bolt sizes larger than 24 mm. bearing surface of the head shall be concentric with the axis of the body within 3 percent of the nmxirmrmwidth across the flats. bearing surfac
19、e shall be equal to 95 percent of dmwn width across flats within plus or minus 5 percent. %e The diameter of N.m MaX Min 15 12 37 28 74 56 129 9EI 204 156 71 8 243 621 475 1075 823 2138 1635 3.8 Workmanship. Finished bolts shall be uniform in quality and appearance. Bolt surfaces in the unplated con
20、dition shall be free of cracks, bursts, folds, tool mrks, seam, v0id.s on the bearing surface, nicks and gauges. Surfaces shall be free of foreign matter. 3.9 Marking. Bolts shall be mrked with military part number and mufacturers identification in accordance with MILSTD-130. - 1/ Torque values base
21、d on 0.18 coefficient of friction and 8% of proof load (m), 6% of proof load (min). 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibilitg for inspection. Unless otherwise specified in the contract or purchase order, the contractor is responsible for the performance of ail inspection requirements as spe
22、cified herein. specified in the contract or purchase order, the contractor may use his own or other facilities suitable for the perfomnce of the inspection requirements specified herein, unless disapproved by the Government. Government reserves the riat to perform any of the inspections set forth in
23、 the specification where such inspections are 8eemed necessarg to assure supplies and services conform to prescribed requirements. Except as otherwise The 4 & Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-9999906 1983902 536 Inspection Group A Exam
24、ination Group B Mechanical properties Hardness Self-locking feature DOD-B-70331 (AR) Requirement Test method paragraph paragraph 1/ 4.3.1 3.5 4.3.2 3.5.1 4.3.2 3.10 4.3.5 4.2 wality conformance inspection. Quality conformance inspection shall be as specified in table III. TAKE III. ualitv conformanc
25、e inmection. - 1/ All requirements not covered by tests. 4.2.1 Inspection lot. An inspection lot shall consist of all bolts covered by a single specification sheet, produced under essentially the same conditions, and offered for inspection at one time. 4.2.2 Rejected lots. If an inspection lot is re
26、jected, the contractor may rework it to correct the defects, or screen out the defective units, and resubmit for reinspection. inspection. Such lots shall be separate from new lots, and shall be clearly identified as reinspected lots. Resubmitted lots shall be inspected using tightened 4.2.3 Samplin
27、g for group A inspection. Sampling shall be in accordance with MIL-STD-105 inspection level II with an acceptable quality level (AQL) of 1.5 percent defective for major defects. with an AQL of 4.0 percent defective shall apply. For minor defects, inspection level I 5 Provided by IHSNot for ResaleNo
28、reproduction or networking permitted without license from IHS-,-,-9999906 1983903 472 DD-E?0331(AR) 4.2.3.1 Classification of defects. Defects shall be classified as specified in table IV. TABLE IV. Classification of defects. Category Critical Major 101 102 1 O3 104 1 O5 106 Minor 20 1 202 203 204 2
29、05 206 207 208 209 Defect None defined Threads, not as specified (see 3.6) Undercut depth of head (see 3.1) Width across flats, not as specified (see 3.1) Slot and recess radius of head (see 3.1) Bearing surface of head (see 3.7.2) Self-locking feature (see 3.10) Overall length of bolt, not as speci
30、fied (see 3.1) Thread length (see 3.1) Other dimensions, not as specified (see 3.1) Protective finish missing (see 3.4) Fillet under head, not as specified (see 3.1) Head taper, not as specified (see 3.7.1) Bearing surface-bolt axis perpendicularity, not as Workmanship, not as specified (see 3.8) Pa
31、ckaging, not as specified (see 5.1) specified (see 3.7.2) Inspection met hod Gage SIE 1/ SIE SIE SI E SIE - SIE SIE SI E Visual SIE SIE SIE Visual Visual I 1/ Standard inspection equipment 4.2.4 Sampling for group B inspection. Sampling shall be in accordance with MIL-STD-105 inspection level S-2 wi
32、th an AQL of 1.5 percent defective. 4.2.4.1 Disposition of sample units. Bolts which have been subjected to group B inspection shall not be delivered on the contract. 4.2.5 Packaging inspection. The sampling and inspection of the preservation-packaging, packing, and container marking shall be in acc
33、ordance with PPP-H-1581. 4.3 Methods of inspection. 4.3.1 Examination. Scniple bolts shall be thoroughly examined to determine conformance with this specification and applicable specification sheets with respect to all the requirements not covered by tests. 6 Provided by IHSNot for ResaleNo reproduc
34、tion or networking permitted without license from IHS-,-,-DOD-B-70331 (AR) 4.3.2 Mechanical properties inspection. Sample bolts shall be tested for conformance to requirements of 3.5 and 3.5.1. Tensile strength shall be determined in accordance with MIL-STD-1312, test method 8. Surface hardness shal
35、l be determined in accordance with MIL-STD-1312, test method 6. 4.3.3 Materials inspection. Material inspection shall consist of certification supporting verifying data that materials used in fabricating bolts are in accordance with 3.2, 3.4, and 3.5. 4.3.4 Protective finish inspection. Sample bolts
36、 shall be inspected for minimum thickness and continuity of the plating in accordance with QQ-P-416 or DOD-P-16232, as applicable (see 3.4). 4.3.5 Self-locking feature test method. The self-locking feature, specified in 3.10, shall be subjected to vibration test of MIL-STD-1312,Test 7. Sample bolts
37、16 mm diameter and smaller shall be installed in test fixture with flat washers and nuts and tightened to the torque values specified in table II. vibration life of less than fifteen (15) minutes shall be cause for rejection. Vibration test on bolts over 16 mm diameter are waived provided the 16 mm
38、and smaller of the same type and design have satisfactorily passed the test. Loosening of bolt and nut assembly, cracks or breaks during 5. PACKAGING 5.1 Packaging requirements. The bolts shall be prepared for shipment as specified in PPP-H-1581. 5.2 Preservation. The level of protection required (l
39、evels A, B, or C) shall be as specified in the contract or order. 6. NOTES 6.1 Intended use. The bolt covered by this specification is intended for use when a self-locking fastener is needed or where the reduction of fatigue failure is desired. flywheel housing bolts, connecting rod bolts, and as be
40、aring capscrew. The bolt my be used in tapped holes or with nuts. Typical applications include uses as cylinder head bolts, 6.2 dering data. Acquisition documents should specify the following: a. Title, number, and date of this specification and the applicable b. c. Level (degree) of protection, in
41、accordance with PPP-H-1581 specification sheet. Applicable specification sheet part number (see 3.1). (see 5.2). 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-9999906 L983905 245 DOE-E-70731 (AR) 6.3 &finitions. 6.5.1 Description. The bolt covere
42、d by this specification is a one piece, free-spinning type of self-locking bolt. flexible diaphragp which is formed between the slotted segpents of the upper part of the bolt head and the circular recess adjacent to the shank in the lower part of the head. This diaphragm acts as a controlled spring
43、element when the head is wrenched against a rigid seat. When used as a bearing cap screw, the mterial against which the head of the bolt seats should be hard enou& to form a rigid seak. Locking action is provided by a 6.4 Patent notice. This bolt is covered lqr U.S. Patent Number 3342236, This bolt
44、is known as a “place“ bolt under this which expires 13 September 1W. license under this patent. patent. The Government does not have a royal free Custodians : Am-AR Review activities: Army - AR, MI DLA -IS NSA -NS User activities : AT - AT, GL, MX Navy - MC, OS, SH Agent : DLA - IS Preparing activity: (Project 576-7) Am-AR 8 U.S. GOVERNMENT PRINTING OFFICE: 1983-605-034/2351 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
