NAVY MIL-DTL-1222 J-2000 STUDS BOLTS SCREWS AND NUTS FOR APPLICATIONS WHERE A HIGH DEGREE OF RELIABILITY IS REQUIRED GENERAL SPECIFICATION FOR [Use In Lieu Of NAVY MIL-S-001222 G (.pdf

1、 AMSC N/A FSC 53GP DISTRIBUTION STATEMENT A: Approved for public release; distribution unlimited. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, Naval Sea Systems Command, SEA 05Q, 2

2、531 Jefferson Davis Hwy, Arlington, VA 22242-5160, by using the Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. INCH-POUND MIL-DTL-1222J 08 December 2000 SUPERCEDING MIL-S-1222H 21 October 1986 (See 6.9 and 6.12) DETAIL SPECIFICATION S

3、TUDS, BOLTS, SCREWS AND NUTS FOR APPLICATIONS WHERE A HIGH DEGREE OF RELIABILITY IS REQUIRED; GENERAL SPECIFICATION FOR This specification is approved for use by all Departments and Agencies of the Department of Defense. 1 SCOPE 1.1 Scope. This specification covers standard studs, hex cap screws, an

4、d heavy hex bolts in nominal standard diameters of inch to 4 inches, nuts in nominal standard diameters of inch to 3 inches, and socket head cap screws in nominal standard diameters of inch to 1 inches for submarine safety and other applications where a high degree of reliability is required (see 6.

5、1). 1.2 Classification. The configurations, types, styles, material grades and conditions of fasteners are as listed below. Non-standard fasteners may be ordered using a drawing with the dimensional and material requirements of the fastener and tested to the requirements of this specification (see 6

6、.2). 1.2.1 Configurations, types and styles Studs Type I - Full body Type II - Reduced body Type III - Constant strength body Type IV - Continuous thread (bolt-stud) Type III studs styles Style Stud end thread Nut end thread a Class 5 Class 3A b Class 5 Class 2A c Class 3A Class 3A d Class 3A Class

7、2A Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-1222J 2 Bolts Type II Heavy hex Type III Heavy hex structural Screws Type I - Hex cap Type II - Socket head cap Nuts Type I - Hex Type II - Hex jam Type III - Heavy hex Type IV - Heavy hex ja

8、m Type V - Hex slotted 1.2.2 Material grades and conditions. The following military grades and conditions are covered in this specification: ALLOY TYPE MATERIAL Grade CONDITION B7 Hardened and Tempered B16 Hardened and Tempered A574 Hardened and Tempered 2H Hardened and Tempered 4Hardened and Temper

9、ed 5Hardened and Tempered 7 Hardened and Tempered 8Hardened and Tempered Alloy Steel 4340Hardened and Tempered 2024 Solution Treated and Naturally Aged 6061 Solution Treated and Artificially Aged Aluminum 7075 Solution Treated and Stabilized Carbon Steel 2As Formed or Stress Relieved 462 As Formed o

10、r Stress Relieved 464 As Formed or Stress Relieved 482 As Formed or Stress Relieved 510 As Formed or Stress Relieved 544 As Formed or Stress Relieved 632 Quenched and Tempered 655As Formed or Stress Relieved 661 As Formed or Stress Relieved 670As Formed or Stress Relieved Copper Alloy 675 As Formed

11、or Stress Relieved Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-1222J 3 ALLOY TYPE MATERIAL Grade CONDITION 304Solution Annealed(A) 304Solution Annealed have the same type, style, and diameter as the production fasteners; and shall be proc

12、essed and heat treated with the production fasteners. 4.5.2.2 Testing of fasteners with reduced length. Fasteners that have passed all of the mechanical property tests of this specification may be reduced in length without repeating the mechanical property tests provided traceability to original lot

13、 and testing is maintained, the fasteners are not Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-1222J 15 heated to a temperature high enough to change their strength or microstructure, and no other dimensions are altered. 4.5.2.3 Wedge tens

14、ile testing of bolts and screws. Wedge tensile tests on headed fasteners shall be done in accordance with ASTM F 606. Bolts and screws that require a calculated test load greater than 150,000 pounds shall be tested on a machine with a test load limit of 150,000 pounds or greater and shall not fail a

15、t a load less than the calculated test load or the limit of the test machine, whichever is lesser. Fasteners may be tested with wedge angles greater than those specified. Because their head configuration will not permit wedge tensile testing, socket flat countersunk cap screws are exempt from wedge

16、tensile testing. 4.5.2.3.1 Wedge angles for socket head cap screws. Wedge angles for socket head cap screws, other than titanium, shall be in accordance with ASTM A 574. Wedge angles for titanium socket head cap screws shall be 6 for fasteners under inch in diameter and 4 for fasteners inch or large

17、r in diameter. Fasteners may be tested with wedge angles greater than those specified. 4.5.2.4 Proof load and axial tensile tests for bolts, screws and studs. Full sized axially tensile tests shall be done in accordance with ASTM F 606. Proof load tests on bolts, screws, and studs shall be done usin

18、g method 1 in accordance with ASTM F 606. Full sized yield strength tests shall be done using method 2 or 2A in accordance with ASTM F 606. Studs selected in accordance with 4.2.2 shall be axial tensile tested in accordance with ASTM F 606. Full sized axial tensile tests on fully threaded rod that i

19、s too long shall be done on a cut specimen. Fasteners that can not be tested full size shall be tested using test specimens machined from the fastener in accordance with ASTM F 606. 4.5.2.5 Proof load test for nuts. Proof load tests on nuts shall be performed in accordance with ASTM F 606. 4.5.2.5.1

20、 Nuts with required proof loads over 120,000 pounds. Hardness tests may not be substituted for proof tests on nuts that require a proof load of over 120,000 pounds. 4.5.2.6 Hardness. Hardness tests shall be performed in accordance with ASTM F 606. All copper, aluminum titanium, and grade 400 fastene

21、rs and grades 304, 305, 316, 321, 347, and 384 cold worked bolts,cold worked screws, cold worked studs, and socket head cap screws do not require hardness testing. Externally-threaded fasteners with hardness values below the minimum requirement may be accepted provided they pass all of the other req

22、uired tests. Nuts with hardness values below the minimum requirement may be accepted provided they pass all of the other required tests. Hardness conversion of steels in accordance with ASTM E 140 is permitted. 4.5.2.7 Alternate mechanical testing. Mechanical test results on the rod, bar, or wire us

23、ed to produce the fasteners, may be substituted for proof stress, yield strength and axial tensile tests of externally-threaded fasteners provided all of the following conditions and tests are met: a) The tests were done on the same lot of rod, bar or wire used to produce the fasteners. b) The faste

24、ners were fabricated solely by machining without further heat treatment or cold work. c) When quenched and tempered or solution annealed and aged rod, bar or wire is used to produce studs, bolts or screws inch in diameter or less, its nominal diameter may be no more than four times the nominal diame

25、ter of the stud, bolt or screw. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-1222J 16 d) When quenched and tempered or solution annealed and aged rod, bar or wire is used to produce studs, bolts or screws over ” in diameter, its nominal di

26、ameter may be no more than twice the nominal diameter of the bolt or screw. e) Headed fasteners are wedge tensile tested in accordance with 4.5.2.3 and meet the requirements of 3.4. Studs are axial tensile tested in accordance with 4.5.2.4 and meet the requirements of 3.4. 4.5.3 Decarburization. Dec

27、arburization examination shall be made in accordance with SAE J121, class B (see 6.2 and 6.3). All decarburization examinations shall be performed after the final heat treatment. Heading fasteners, without heating the threaded area, is not, for the purposes of decarburization examination, a heat tre

28、atment. Decarburization examination may be done on the fastener or the rod, bar or wire used to manufacture the fastener. Bar, rod or wire, decarburized to a greater extent than permitted by SAE J121, class B, may be used, without retesting, provided the depth of total decarburization is removed dur

29、ing a subsequent machining operation. Headed fasteners machined from heat-treated bar shall not require a decarburization test. 4.5.4 Magnetic permeability. Determination of magnetic permeability shall be conducted in accordance with ASTM A 342, method 3 to meet the requirements of 3.8. 4.5.5 Protec

30、tive coating thickness. Protective coating thickness may be determined by one of the following methods: microscopic to ASTM B 487, coulometric method to ASTM B 504 or x-ray spectrometry to ASTM B 568. No less than two measurements shall be made on each sample to determine compliance with 3.6.3. The

31、method used shall produce results that are precise within 0.4 mils or 10 percent of the specified coating thickness, whichever is greater. Failure of the coating thickness to meet the minimum coating thickness requirements shall be cause for rejection. 4.5.6 Hydrogen embrittlement relief. When hydro

32、gen embrittlement relief is required by 3.7, a stress durability test shall be performed in accordance with NASM-1312, method 5. The test duration shall not be less than 48 hours. A wedge in accordance with 4.5.2.3 shall be used under the heads of bolts and screws or under nuts threaded on studs. 4.

33、6 Invalid Tests. Tests required in 4.5.2 and 4.5.6 may be discarded and a replacement test done on a specimen selected from the same lot of fasteners when any one of the following conditions occur: a) The test specimen was incorrectly machined b) The test procedure was incorrect c) There was a malfu

34、nction of the testing equipment d) An external flaw, that is not indicative of an inferior or defective lot, develops during the test. Test specimens with internal flaws, such as cracks, ruptures and porosity, are not invalid. Provided by IHSNot for ResaleNo reproduction or networking permitted with

35、out license from IHS-,-,-MIL-DTL-1222J 17 5 PACKAGING 5.1 Packaging requirements. For acquisition purposes, the packaging requirements shall be specified in the contract or order (see 6.2). When actual packaging of material is to be performed by DoD personnel, these personnel need to contact the res

36、ponsible packaging activity to ascertain requisite packaging requirements. Packaging requirements are maintained by the Inventory Control Points packaging activity within the Military Department or Defense Agency or within the Military Departments System Command. Packaging data retrieval is availabl

37、e from the managing Military Departments or Defense Agencys automated packaging files, CD-ROM products, or by contacting the responsible packaging activity. 6 NOTES (This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.) 6.1 Intended use. Fas

38、teners meeting this specification are intended for general, high temperature, high strength and corrosive environment applications where a high degree of reliability is required. It is designed to be used to acquire commercial off-the-shelf fasteners with added inspections to verify the high degree

39、of reliability required. Fastener types and grades have been selected to meet diverse applications which include: elevated temperatures, immersion in sea water, salt air/marine environments, high preloads and high shock loadings. 6.1.1 Martensitic stainless steel fasteners. Condition “I” was develop

40、ed for martensitic corrosion resisting steel fasteners requiring moderate strength and greater resistance to stress corrosion cracking in moist, halogenated, sulfur containing or wet environments. 6.2 Acquisition requirements. Acquisition documents must specify the following: a) Title, number, and d

41、ate of this specification. b) Part number (see 3.14), configuration, type, style, grade, condition (see 1.2), size, length (for studs, bolts and screws), (see 3.9.2.2), thread series, and class of fit (see 3.9.1, 3.9.1.1, 3.9.1.2) and, when needed, end configuration (see 3.9.2.2). When a nonstandard

42、 fastener is needed, it may be specified on a drawing. (See 1.2). c) Issue of DoDISS to be cited in the solicitation and if required, the specific issue of individual documents referenced (see 2.2.1 and 2.3). d) When heat treatments do not need to be controlled in accordance with AMS 2750 or MIL-STD

43、-1684 (see 3.3). e) Type of coating (see 3.6.1) and the minimum coating thickness for all internally-threaded fasteners, all externally-threaded fasteners with class 3A or 5 threads, and those externally-threaded fasteners with class 2A threads that need a thicker coating (see 3.6.3), when required.

44、 f) When aluminum alloy fasteners are to be coated with an immersion zinc flake/chromate dispersion coating (see 3.6.5), the coating procedure and thickness requirements shall be provided. g) When titanium alloy fasteners are to be coated with an inorganic coat (see 3.6.6). h) When cut or ground thr

45、eads are not permitted. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-1222J 18 i) The thread series, when a nonstandard thread series is needed (see 3.9.1, 3.9.1.1, 3.9.1.2). j) Bearing surface of the nut, when a specific bearing surface is

46、 needed (see 3.9.3 and 3.9.6). k) Self-locking element, when required (see 3.10). l) Identification markings, when a nonstandard identification marking is needed (see 3.13). m) When required, the following are to be reported: (1) examination test results (see 4.3.1, 4.3.2, 4.3.3, 4.4, and 6.3) (2) c

47、hemical analysis(see 4.5.1 and 6.3), (3) mechanical property test results (see 4.5.2 and 6.3), (4) decarburization tests (see 4.5.3 and 6.3), and (5) magnetic permeability tests (see 4.5.4 and 6.3). n) When resubmittal of fastener lots that failed an examination is allowed (see 4.3.1 and 6.7). o) Wh

48、en retesting of mechanical tests is allowed (see 4.5.2 and 6.5). p) When rework and resubmittal of lots is allowed (see 4.5.2 and 6.6). q) Procedure for inspecting defects in fasteners, when a nonstandard inspection procedure is needed. (See 4.3.2 and 4.3.2.1). r) Acceptance criteria for accepting i

49、nspected defects, if a nonstandard inspection criteria is needed (see 4.3.2 and 4.3.2.1). s) Nondestructive testing procedures and acceptance criteria, when additional nondestructive testing is needed (see 4.3.3). t) When mechanical tests are to be done before the final heat treatment (see 4.5.2). u) Packaging requirements (see 5.1) v) When group 2 (316) may be furnished for group 1 (304) (see table I). w) When group 6 (431) may be furnished for