1、MIL-C-20704C 7. February 1980 SUPERSEDING MIL-C-20704B 28 July 1970 MILITARY SPECIFICATION Beneficial comments (recommendations, additions deletions) and any pertinent data which may be of use in improving this document should be addressed to: US Amy Mobility Equipment Research and Development Conmi
2、and, ATTN: DRDME-DS, Fort Belvoir, Virginia 22060 by using the self-addressed Standarization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by CUTTING EDGES, MOLDBOARD, GRADER This specification is approved for use by all Departments and Agencies of the Departm
3、ent of Defense. 1. SCOPE 1.1 Scope. This specification covers cutting edges for grader moldboards. 1.2 Classification. The cut-ting edges shall be of the following sizes as specified (see 6.2): 5-foot (MS35465-1) 6-foot (MS35465-2) 7- foot (MS35465-3) 2. APPLICABLE DOCUMENTS 2.1 Issues of documents.
4、 The following documents of 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: SPECIFICATIONS MILITARY MIL-P-116 STANDARDS MILITARY MIL- STD- 1 O 5 - Preservation-Packaging Methods of. - Sampling Procedures and
5、 Tables for Inspection by Attributes. FSC 3805 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-20704C 38 W 9777906 0452405 O W MIL-C-20704C MIL-STD-129 MIL-STD-1188 MIL-STD-130 MS35465 - Marking for Shipment and Storage, - Comercial Packaging o
6、f Supplies and - Identification Marking of US Military - Cutting Edge, Moldboard, Grader. Equipment. Property. (Copies of Military specifications and standards required by contractors in connection with specific procurement functions should be obtained from the procuring activity or as directed by t
7、he contracting officer.) 2.2 Other publications. The following documents form a part of this specification to the extent specified herein. identified, the issue in effect on date of invitation for.bids or request for proposal shall apply. Unless a specific issue is SOCIETY OF AUTOMOTIVE ENGINEERS (S
8、AE) SAE Handbook (Application for copies should be addressed to the Society of Automotive Engineers, 400 Commonwealth Drive, Warrendale, PA 15096.) AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) E 112 - Methods for estimating the average grain size of metals. (Application for copies should be add
9、ressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.) 3. REQUIREMENTS 3.1 Description. Unless otherwise specified (see 6.21, the 5-, 6-, and 7-foot size cutting edges shall be fabricated in accordance with MS35465, part number 1, 2, and 3 respectively.
10、3.2 Material. Material shall be electric furnance, basic open hearth or basic oxygen steel. E 112,Size 5 to 8. inclusions, segregations, cracks, seams, pipes, caps, and pits (see 6.3). The grain size of the steel shall conform to ASTM The steel shall be appreciably free from nonmetallic 3;3 Chemical
11、 composition of steel. Unless otherwise specified (see 6.21, the Chemical composition cutting edge shall be of steel conforming to SAE No. 1090. of the CAE No. 1090 steel shall be in accordance with CAE 5403. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from
12、 IHS-,-,-MIL-C-20704C 3.4 Hardness of steel. Unless otherwise specified (see 6.21, the finished cutting edge shall have a hardness in the range of 271-344 Brinell, 28-37 Rockwell C, to resist wear and abrasion. I 3.5 Fasteners. Bolts, nuts, and washers shall be furnished, and shall be packed in a se
13、parate container. 3.6 Finish. The cutting edges shall be finished in accordance with the contractors standard practice for this type of cutting edge. 3.7 Identification marking. The cutting edges shall be marked in accordance with MIL-STD-130. 3.8 Workmanship. Finished cutting edges shall be free fr
14、om sharp burrs, fins, loose scale, rust and other defects which may impair durability or serviceability. Boltholes shall be finished clean, without burrs caused by punching or cutting. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the contract, the
15、contractor is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified in the contract, the contractor may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by
16、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 supplies and services conform to prescribed requirement s. 4.2 Inspection lot. All cutting edges of the same type presented at one
17、time shall be considered a lot for the purpose of inspection and acceptance. 4.3 Sampling. Sampling for inspection shall be in accordance with MIL-STD-105, Inspection Level II. AQL shall be 2.5 percent defective. 4.4 I-. Each of the sample cutting edges selected in accordance with 4.3 shall be inspe
18、cted to verify compliance with this specification. Cutting edges in the sample containing one or more defects shall be rejected, and if the number of defective cutting edges in any sample exceeds the acceptance number for that sample, the lot represented by the sample sah11 be rejected. Sample cutti
19、ng edges shall be examined to determine compliance with the requirements listed in table I. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-20704C 38 = 999790b 0452407 4 101 102 103 104 105 106 107 MIL-C-20704C Cutting edge size not as specif
20、ied. Cutting edge does not conform to description as specified. Material not as specified. Fasteners not as specified. . Finish not as specified, Identification marking not as specified. Workmanship not as specified. TABLE I. Examination schedule Number I Characteristics IRequirment Paragraph I I 1.
21、2 3.1 3.2 3.5 3.6 3.7 3.8 4.5 Certification. 4.5.1 Chemical composition. The contractor shall submit proof satisfactory to the procuring agency that the cutting edges to be supplied under this specification meet the chemical composition and requirements specified in 3.3 or as stated in the invitatio
22、n for bid or contract. 4.5.2 Hardness of steel. The contractor shall submit proof satisfactory to the procuring agency that the cutting edges to be supplied under this specification meet the hardness requirement specified in 3.4 or as stated in the invitation for bid or contract. 4.6 Inspection of p
23、ackaging, For the purpose of inspection, a completed pack prepared for shipment shall be considered a unit of product. Sampling for examination shall be in accordance with MIL-STD-105, for the characteristics listed in table II. AQL shall be 2.5 percent defective. Samples shall be examined TABLE II,
24、 Examination schedule - packaging Number 108 109 110 111 112 113 I Characteristics Preservation not in accordance with level A as specified. Commercial preservation not in accordance with MIL-STD-1188 as specified. Packing not in accordance with Level A as specified. Commercial packing not in accord
25、ance with MIL-STD-1188 as specified. Marking not in accordance with MIL-STD-129 for level A. Commercial marking not in accordance Requirement Paragraph 5.1.1 5.1.2 5.2.1 5.2.2 5.3 5.3 Iwith MIL-STD-1188-as specified. I - 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without
26、license from IHS-,-,-MIL-C-20704C 5. PACKAGING 5.1 Preservation. Preservation shall be level A or Commercial as specified (see 6.2). 5.1.1 Level A. Cutting edges shall be preserved in accordance with MIL-P-116, Method I, applying Type P-1 preservation to all unpainted base metal surfaces of the cutt
27、ing edges, bolts, and nuts. 5.1.2 Comercial. Commercial preservation shall be in accordance with MIL-STD-1188, except that unit container is not required 5.2 Packing. 5.2.1 Level A. Packing shall be level A or comercial as specified (see 6.2). Cutting edges in quantities of two shall be bolted toget
28、her Strapping to form a uniform bundle or pack with two standard plow bolts, or with the size and type required for attaching the cutting edges to the moldboard. may be used as an alternate to band the cutting edges together. 5.2.2 Commercial. Commercial packing shall be in accordance with MIL-STD-1
29、188, except that a shipping container is not required. 5.3 Marking. In addition to any special marking required, the bundles shall be marked in accordance with MIL-STD-129 for level A. Comercial marking shall be in accordance with MIL-STD-1188. 6. NOTES 6.1 Intended use. Cutting edges covered by thi
30、s specification are intended for use on grader moldboards. 6.2 Ordering data. Purchasers should select the preferred options permitted. herein, and include the following information in procurement documents: (a) Title , number and date of this specification. (b) (c) (d) (e) (f) Size cutting edge req
31、uired (see 1.2). When fabrication other than specified is required (see 3.1). When chemical composition other than specified is required (see 3.3). When hardness other than specified is required (see 3.4). Degree of preservation and degree of packing required (see 5.1 and 5.2). 5 Provided by IHSNot
32、for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-20704C 6.3 Recycled material. It is encouraged that recycled material be used when practical as long as it meets the requirements of the specification (see 3.2). Custodians: Army - ME Review activity: Army - AT DLA - CS User activities: Army - CE Navy - YD . 6 Preparing activity : Army - ME Project 3805-0113 c Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
