1、I I METRIC 1 DOD-N-70333 18 June 1985 MILITARY SPECIFICATION NUT, PLAIN AND SELF-LOCKING, CLINCH, METRIC (SELF-CLINCHING, KNIXLED COLLAR) FIXED AND EOATING, GENERAL SPECIFICATION FOR This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Sco
2、pe. This specification covers metric nuts which are permanently attached to a structure by pressing the nut shank into a single hole. Anti-rotation is pro- vided by the penetration of the knurl into structural material and push-out resis- tance results from cold flow of the structure material into a
3、 groove in the shank of the nut. 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications, standards, and handbooks. The following specifications, standards and handbooks form a part of this specification to the extent specified herein. Unless otherwise specified, the issues shall be t
4、hose listed in the issue of the Department of Defense Index of Specifications and Standards (DoDISS) and supplement thereto, cited in the solicitation. SPECIFICATIONS FEDERAL QQ-S-365 - Silver Plating, Electrodeposited; General Requirexents for QQ-P-416 - Plating, Cadmium (Electrodeposited) PPP-H-15
5、81 - Hardware (Fasteners and Related Items), Packaging of Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document, should be addressed to: Commander, US Army Armament, Munitions and Chemical Command, ATTN: AEISYC-TUA- S(D), Do
6、ver, New Jersey 07801-5001 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. FSC 53 10 DISTRIEUTION STATEMENT A. Approved for ptblic release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduc
7、tion or networking permitted without license from IHS-,-,-DOD-N-70333 MILITARY MIL-1-6866 - Inspection, Penetrant Method of MIL-1-6868 - Inspection Process, Magnetic Particle MIL-L-46030 - Lubricant, Solid Film :Heat Cured, Corrosion Inhibiting DOD-N-70333/1 - Nut, Plain and Self-Locking, Clinch, Fi
8、xed, Metric (Self- Cl inching, Knurled Collar) DOD-N-70333/2 - Nut, Plain and Self-Locking, Clinch, Floating, Metric (Self-Clinching, Knurled Collar) STANDARDS FEDERAL FED-STD-H28/20- - Screw-Thread Standards for Federal Services, Section 20, Inspection Methods for Acceptability of UN, UNR, UNJ, M a
9、nd MJ Screw-Threads Metric Screw-Threads FED-STD-H28/21 - Screw Thread Standards for Federal Services, Section 21, MILITARY MIL-STD-105 - Sampling Procedures and Tables for Inspection by Attributes MIL-STD-1312 - Fasteners, Test Methods (Copies of specifications, standards, handbooks, drawings and p
10、ublications required by manufacturers in connection with specific acquisition functions should be obtained from the contracting activity or as directed by the contracting officer.) 2.2 Other publications. The following documer.ts form a part of this specifi- cation to the extent specified herein. Un
11、less otherwise specified, the issues of the documents that are adopted by DoD shall be those in the DoDISS cited in the solicitation. Unless otherwise specified, the issues of documents which have not been adopted shall be the issue of the nongovernment documents which are current on the date of the
12、 solicitation. AEROSPACE MATERIAL SPECIFICATION (AMs) AMs 5085 - Steel Sheet, Strip, and Plate AMS 5525 - Steel Sheet, Strip, and Plate, Corrosion and Heat Resistant AMs 5731 - Steel Bars, Forgings, Tubing and Rings, Corrosion and Heat Resistant AMS 5734 - Steel Bars, Forgings, and Tubing, Corrosion
13、 and Heat Resistant ANS 6322 - Steel Bars, Forgings, and Rings AMS 6382 - Steel Bars, Forgings, and Rings (Application for copies should be addressed to the Society of Automotive Engineers, Inc., 400 Commonwealth Drive, Warrendale, PA 15096.) AMERICAN NATIONAL STANDARDS LNSTITUlE (AXSI ANSI B46.1 -
14、Surface Texture (Application for copies should be addressed to ANSI, 1430 Broadway, New York, NY 10018.) ? Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DOD-N-70333 AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM A380 - Cleaning and Descalin
15、g Stainless Steel Parts, Equipment ASTM A581 - Free-Machining Stainless and Heat-Resisting Steel Wire. and Systems. (Application for copies should be addressed to ASTM, 1916 Race Street, Philadelphia, PA 19103.) (Nongovernment documents are normally available from the organizations which pre- pare o
16、r which distribute the documents. These documents also may be available in or through libraries or other informational services.) 2.3 Order of precedence. In the event of a conflict between the text of this specification and the references cited herein (except for associated detail spec- ifications,
17、 specification sheets or MS standards), the text of this specification shall take precedence. Nothing in this specification, however, shall supersede applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 Specification sheets. The individual item requireme
18、nts shall be as specified herein and in accordance with the applicable specification sheet. In the event of any conflict between requirements of this specification and the specification sheet, the latter shall govern. 3.2 Material. Recycled and reclaimed materials shall be used to the maximum extent
19、 practicable. Nuts shall be made from the following materials, as specified in the applicable specification sheet (See 3.1) when inspected in conformance with 4.6.2. 3.2.1 Alloy steel. The alloy steel fixed nut and floating nut shall be made from grade 8740 (UNS G87400) conforming to AMS 6322 or gra
20、de 4140 (UNS G41400) conforming to AMs 6382. Optional floating nut element material shall be grade 1050 (UNS G10500) conforming to AMs 5085. 3.2.2 Corrosion-resistant steel. The corrosion-resistant steel fixed nut shall be made from type 303 (UNS S30300) conforming to ASTM A581, condition A or B, or
21、 type A286 (UNS S66286) conforming to AMs 5731 or AMs 5734. Float- ing nut shall be made from type A286 (UNS S66286) conforming to AMs 5731 or AMs 5734. Optional floating nut element material shall be type A286 (UNS S66286) conforming to AMs 5525. 3.3 Protective finish and surface treatment. 3.3.1 C
22、admium plating. Alloy steel nuts shall be cadmium plated in accord- ance with QQ-P-416, Type II, Class 3, 5 micrometers (Fm) thick, when inspected in conformance with 4.6.3.1. 3.3.2 Silver plating. Corrosion-resistant steel, type A286 fixed nuts and floating nut elements with internal thread locking
23、 feature shall be silver plated in accordance with QQ-S-365, Type II, Grade B, 5 pm thick, when inspected in conformance with 4.6.3.1. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- DOD-N-70333 m 9999906 I1980957 971 m DOD-N-70333 3.3.3 Cleaning,
24、 descaling and passivation. Corrosion-resistantsteel nuts shall be cleaned, descaled and passivated in accordance with ASTM A380 when inspected in conformance with 4.6.3.2. 3.3.4 Lubricant. Nuts with internal thread locking feature shall be coated with a solid film lubricant in accordance with MIL-L
25、-46010 when inspeted in onform- ance with 4.6.3.3. 3.4 Design, dimensions and tolerances. Designs, dimensions, and tolerances shall conform to the requirements of the applicable specification sheet (See 3.1) and shall apply after application of the plating or cleaning, descaling and passivation trea
26、tment and prior to the application of solid film lubricant. 3.4.1 Threads. Threads shall be right hand MJ profile in accordance with FED-STD-H28/21 and the applicable specification sheet (See 3.1). 3.4.1.1 Internal threads. Internal threads shall be tolerance class 4H6H for thread sizes through MJ5x
27、0.8 and tolerance class 4H5H for thread sizes greater than MJ5x0.8. Thread gaging shall be perfbrmed after plating and prior to the application of solid film lubricant. For nuts with internal thread locking feature, the “GO“ plug gage shall enter a minimum of 3/4 turn before engagement of the lockin
28、g feature when inspected in conformance with 4.6.4.1. 3.4.2 Internal thread locking feature. The internal thread of the nut shall be distorted to impose friction between the nut and the inserted item. The feature shall not operate by means of separate movement from the installation, nor depend upon
29、axial load on the inserted items, but shall be an integral part of the nut wall. 3.4.2.1 Self-locking torque. When the nut is properly installed in the parent material, the locking feature shall provide a locking torque with a mating screw or bolt of tolerance class 4h, that is within the limits spe
30、cified in Bble I when tested as specified in 4.7.2. Nuts shall not be subjected to self-locking tests after testing as specified in 4.7.3. TABLE I. Self-locking torque. INTERNAL THREAD SIZE MJ2.5x0.45 MJ3xO. 5 MJ3.5x0.6 MJ6x 1 MAX BREAKAWAY LOCKING MIN TORQUE TORQUE Nem Nem O. 45 0.06 O. 60 o. o9 o.
31、 75 o. 12 o. 90 O. 14 1.60 O. 36 2.80 O. 23 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DOD-N-70333 m 9999906 1980958 808 m DOD-N-70333 3.5 Surface texture. The surface texture of the nut prior to plating, where applicable, shall not exceed the
32、 values specified in the applicable specification sheet (See 3.1) and shall be in accordance with ANSI B46.1 when inspected in conformance with 4.6.5. 3.6 Metallurgical properties. - 3.6.1 Discontinuities. The nut shall not contain discontinuities, that is, laps, seams and inclusions which equal or
33、exceed the limitations spec- ified herein. Care must be exercised not to confuse cracks with discon- tinuities. When visual inspection discloses discontinuities which show cause for further examination, magnetic particle or penetrant inspection, as applicable, shall be as specified in 4.6.6 for size
34、 MJ5 and larger. 3.6.1.1 Cracks. (see 6.3.1) The nut shall be free from cracks in any direction or location when inspected in conformance with 4.6.6. 3.6.1.2 Laps and seams. (see 6.3.2 and 6.3.3) The nut may show evi- dence of laps and seams except the depth shall not exceed 0.2 mm for MJ2.5 through
35、 MJ3.5 and 0.25 mm for MJ4 through MJ6 when inspected in conformance with 4.6.6. 3.6.1.3 Inclusions. (see 6.3.4) Small inclusions in parts of the nut which are not indicative of unsatisfactory quality are permissible except the depth shall not exceed 0.2 mm for MJ2.5 through MJ3.5 and 0.25 mm for MJ
36、4 through MJ6 when inspected in conformance with 4.6.6. 3.7 Mechanical properties. 3.7.1 “- Hardness. The nut shall meet the hardness as specified in the applicable specification sheet (see 3.1) when tested in accordance with 4.7.1. 3.7.2 Resistance to push-out. When properly installed in accordance
37、 with the applicable specification sheet (see 3.1), the nut shall have a minimum resistance to push-out from the parent material as specified in the applicable specification sheet (see 3.1). The values are based on nuts installed in a test panel having an ultimate tensile strength of 310 MPa when te
38、sted in conformance with 4.7.3 without loosening, cracking or thread damage. 3.7.3 Resistance to torque-out. When properly installed in accordance with the applicable specification sheet (see 3.1), the nut shall have a minimum resistance to torque-out from the parent material as specified in the app
39、li- cable secification sheet (see 3.1). The values are based on nuts installed in a test panel having anultimate tensile strength of 310 MPa when tested in conformance with 4.7.4. 3.8 Workmanship. Workmanship shall be consistent with the type of product, finish and class of thread fit specified. Nut
40、s shall be of uniform quality and free from defects which would be detrimental to the performance of the nut. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specif
41、ied in the contract or pur- chase order, the contractor is responsible for the performance of all inspection require- ments as specified herein. Except as otherwise specified in the contract or purchase order, the contractor may use his own or any other facilities suitable for the performance of the
42、 inspection requirements specified herein, unless disapproved by the Government. The Government reserves the right to perform any of the inspections set forth in the spec- ification where such inspections are deemed necessary to assure supplies and services con- form tooprescribed requirements. 4.1.
43、1 Responsibility for compliance. All items must meet all section 3 and 5 require- ments. The inspection set forth in this specification shall become a part of the contrac- tors overall inspection system or quality program. The absence of any inspection re- quirements in the specification shall not r
44、elieve the contractor of the responsibility of . assuring that all products or supplies submitted to the Government for acceptance comply with all requirements of the contract. Sampling in quality conformance does not author- ize submission of known defective material, either indicated or actual, no
45、r does it commit the Government to acceptance of defective material. 4. l. 2 Test panel fabrication. Test panel shall be of suitable thickness and hardness for the nut being tested as specified in the applicable specification sheet (see 3.1). Larger test panel for multiple testing of nuts is permiss
46、ible except for test of 4.7.4. 4.1.3 Test sample installation. Sample nuts shall be installed in accordance with the applicable specification sheet (see 3.1) in test panels specified in 4.1.2. 4.1.3.1 Inspection of installed nuts. The nut installed as specified in 4.1.3 shall be visually inspected u
47、nder 10 diameters magnification. Theipresence of cracks in either test panel or nut as a result of installation shall be cause for rejection. When visual inspection discloses a condition which show cause for further examination, the specimen shall be penetrant inspected in accordance with MIL-1-6866
48、. 4.1.3.2 Test bolts and screws. Bolts and screws for use in all tests shall have toler- ance class 4h6h threads in accordance with FED-STD-H28/21. 4.1.3.2.1 Bolts and screws used for the test of 4.7.2 shall be corrosion-resistant steel, cleaned, descaled and passivated in accordance with ASTM A380.
49、 Cadmium plated, non-cor- rosion-resistant steel bolts and screws shall be used for testing alloy steel nuts. 4.1.4 Test equipment and inspection facilities. The manufacturer shall insure that test and inspection facilities of sufficient accuracy; quality and quantity are established and maintained to permit performance of required inspections, 4.2 Quality conformance inspection. Quality conformance inspection shall be as specified in table II. 4.2.1 Inspection lot. An inspect
