DLA MIL-DTL-2710 C-2010 LINKS CHAIN DETACHABLE REGULAR AND PEAR-SHAPED.pdf

1、Comments, suggestions, or questions on this document should be addressed to Defense Logistics Agency Aviation VEB, 8000 Jefferson Davis Highway, Richmond, VA 23297-5616, or e-mailed to STDZNMGTdla.mil. Since contact information can change, you may want to verify the currency of this address informat

2、ion using the ASSIST database at https:/assist.daps.dla.mil/. AMSC N/A FSC 4010 INCH-POUND MIL-DTL-2710C 10 September 2010 SUPERSEDING MIL-L-2710B 25 March 1991 DETAIL SPECIFICATION LINKS, CHAIN, DETACHABLE, REGULAR AND PEAR-SHAPED Reactivated after 10 September 2010 and may be used for new and exis

3、ting designs and acquisitions. This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers regular and pear-shaped detachable links for connecting shots of anchor chain, for connecting the anchor to the outboard s

4、wivel shot, and for connecting other chain appendages as necessary. 1.2 Classification. The detachable links are of the following types, classes, and sizes as specified (see 6.2): Type I - Regular Class 1 - Standard Sizes: 1-7/8 inch; 2 inch; 2-1/8 inch; 2-1/4 inch; 2-3/8 inch; 2-1/2 inch; 2-5/8 inc

5、h; 2-3/4 inch; 2-7/8 inch; 3 inch; 3-1/8 inch; 3-1/4 inch; 3-3/8 inch; 3-1/2 inch; 3-5/8 inch; 3-3/4 inch; 3-7/8 inch; 4 inch; 4-3/4 inch Class 2 - Heavy duty Sizes: 2-3/4 inch; 3 inch; 3-1/2 inch Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-D

6、TL-2710C 2 Class 3 - High strength Sizes: 3/4 inch; 7/8 inch; 1 inch; 1-1/8 inch; 1-1/4 inch; 1-1/2 inch; 1-3/8 inch; 1-5/8 inch; 1-3/4 inch Type II - Pear-shaped Sizes: Number 2: 3/4 - 7/8 inches Number 3: 1 - 1-1/8 inches Number 4: 1-1/4 - 1-1/2 inches Number 5: 1-5/8 - 2 inches Number 6: 2-1/8 -

7、2-3/8 inches Number 7: 2-1/2 - 3-1/8 inches Number 8: 3-1/4 - 3-1/2 inches 1.3 Detachable link components. Detachable links consist of the following components (see figure 1 and figure 2): a. C-link. b. Coupling plate - right hand. c. Coupling plate - left hand. d. Taper pin. e. Hairpin (hairpin wil

8、l be furnished only for detachable links used in an outboard swivel shot (see 6.2). 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3 and 4 of this specification. This section does not include documents cited in other sections of this specification

9、 or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements of the documents cited in sections 3 and 4 of this specification, whether or not they are l

10、isted. 2.2 Government documents. 2.2.1 Specifications and standards. The following specifications and standards form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. FEDERAL SPECIFICATIO

11、N VV-G-632 - Grease, Industrial, General Purpose Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-2710C 3 FEDERAL STANDARD FED-STD-595/27038 - Miscellaneous, Semigloss DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-DTL-24441/20 - Paint, Epoxy-Polyam

12、ide, Green Primer, Formula 150, Type III MIL-PRF-24635 - Coating Systems, Weather-Resistant, Exterior Use DEPARTMENT OF DEFENSE STANDARDS MIL-STD-130 - Identification Marking of U.S. Military Property MIL-STD-2035 - Nondestructive Testing Acceptance Criteria (Copies of these documents are available

13、online at https:/assist.daps.dla.mil/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.2.2 Other government drawings. The following other government drawings form a part of this document to the extent specified herein. Unless otherwise

14、 specified, the issues are those cited in the solicitation or contract. DRAWINGS NAVY 803-860062 - Links, Detachable, Standard and Heavy Duty 803-921790 - Links, Detachable High Strength 803-6397316 - Link, Detachable, Pear Shaped 804-840327 - Tool Boxes and Tools (Steel Box) for Assembling and Disa

15、ssembling Detachable Links (Copies of these drawings are available from Commander, Naval Sea Systems Command, 1333 Isaac Hull Avenue SE, Washington Navy Yard, DC 20376-1080. 2.3 Non-government publications. The following documents form a part of this document to the extent specified herein. Unless o

16、therwise specified, the issues of these documents are those cited in the solicitation or contract. AMERICAN SOCIETY FOR QUALITY (ASQ) ASQ Z1.4 - Sampling Procedures and Tables for Inspection by Attributes (Copies of this document are available online at http:/www.asq.org/ or from American Society of

17、 Quality, 600 North Plankinton Avenue, Milwaukee, WI 53203.) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-2710C 4 ASTM INTERNATIONAL ASTM A275/A275M - Standard Practice for Magnetic Particle Examination of Steel Forgings ASTM A322 - Standa

18、rd Specification for Steel Bars, Alloy, Standard Grades ASTM A370 - Standard Test Methods and Definitions for Mechanical Testing of Steel Products ASTM A580/A580M - Standard Specification for Stainless Steel Wire ASTM A581/A581M - Standard Specification for Free-Machining Stainless Steel Wire and Wi

19、re Rods ASTM A582/A582M - Standard Specification for Free-Machining Stainless Steel Bars (Copies of these documents are available online at http:/www.astm.org/ or from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959.) 2.4 Order of precedence. Unless otherwi

20、se noted herein or in the contract, in the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3

21、. REQUIREMENTS 3.1 First article. When specified (see 6.2), a sample shall be subjected to first article inspection (see 6.3) in accordance with 4.2. 3.2 Material. Material for the detachable link components shall be as specified in 3.2.1 through 3.2.4. Material used in normal production shall be th

22、e same composition as material used for first article sample in chemistry, quality, and properties. 3.2.1 C-link and right and left hand coupling plates. Steel used in the manufacture of the C-link and coupling plates shall be forged from alloy steel as specified in table I. 3.2.1.1 C-link and coupl

23、ing plate material chemical composition. The chemical composition of the steel of the C-link and coupling plates shall conform to the chemical composition of the American Iron and Steel Institute (AISI) alloy steel grades specified in table I (see 4.5.1). 3.2.2 Taper pin. The taper pin shall be mach

24、ined from type 416 stainless steel. The finished taper pin shall conform to ASTM A582/A582M, condition H. 3.2.2.1 Taper pin material chemical composition. The chemical composition of the stainless steel of the taper pin shall conform to the chemical composition of type 416 stainless steel in accorda

25、nce with ASTM A582/A582M (see 4.5.1). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-2710C 5 TABLE I. C-link and coupling plates material. Detachable link classification ASTM A322, grade Type I, Class 3 3/4 inch through and including 1-1/2 i

26、nch Type II Number 2 and number 3 8637 or 4340 Type I, class 1 1-7/8 inch and over Type I, class 2 2-3/4 inch, 3 inch, and 3-1/2 inch Type I, class 3 1-5/8 inch and 1-3/4 inch Type II Number 4 through and including number 8 4340 or 8640 3.2.3 Plug. The plug shall be cast from antimony alloy and lead

27、. 3.2.3.1 Plug material chemical composition. The chemical composition of the plug shall be 8 0.5 percent antimony alloy and the remaining element shall be lead (see 4.5.1). 3.2.4 Hairpin. The hairpin, when specified (see 6.2), shall be formed from stainless steel wire, type 304 or 303, condition A,

28、 conforming to ASTM A580/A580M or ASTM A581/A581M, respectively. 3.2.4.1 Hairpin material chemical composition. The chemical composition of the stainless steel of the hairpin shall conform to the chemical composition of type 304 of A580/A580M or type 303 of ASTM A581/A581M (see 4.5.1). 3.2.5 Recover

29、ed materials. Unless otherwise specified herein, materials incorporated in the products covered by this specification shall be new and may be fabricated using materials produced from recovered materials to the maximum extent practicable without jeopardizing the intended use. The term “recovered mate

30、rials“ means materials which have been collected or recovered from solid waste and reprocessed to become a source of raw materials as opposed to virgin raw materials. None of the above shall be interpreted to mean that the use of used or rebuilt products is allowed under this specification unless ot

31、herwise expressly specified. 3.3 Heat treatment. C-link and coupling plates shall be heat treated above the upper transformation temperature, at a combination of temperature and time to produce a fine grain structure throughout the component and produce a minimum tensile strength of 170,000 pounds p

32、er square inch (lb/in) (Brinell hardness 341 to 375, or direct equivalent in accordance with ASTM A370 (see 6.4). The components shall not be heated more than twice. Heat treatment Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-2710C 6 recor

33、ds shall be made available for inspection and shall include time and temperature, quenching, stress relieving, and cooling method. 3.4 Mechanical properties. The unmachined C-link and coupling plate samples shall be sectioned for determination of the tensile strength specified in 3.3. If it is impra

34、cticable to take specimens from finished components, the specimens may be taken from stock of the same heat or melt of steel. 3.5 Brinell hardness - C-link and right and left hand coupling plates. The Brinell hardness shall be established for a first article sample of the C-link and coupling plates

35、in accordance with 4.5.6. 3.6 Brinell hardness - taper pin. The finished taper pin surface shall have a Brinell hardness of 350 (minimum) (see 4.5.5). 3.7 Dimensions. Dimensions and tolerance for type I and type II detachable link components shall be in accordance with the drawings specified below (

36、see 4.4.1): a. Type I, class 1 and class 2 - Drawing 803-860062. b. Type I, class 3 - Drawing 803-921790. c. Type II - Drawing 803-6397316. 3.7.1 Pull draft angles, C-link and coupling plates. All pull draft angles of C-links and coupling plates of detachable links shall be measured in accordance wi

37、th 4.4.1.1. The pull draft angle limits shall be 3 degrees minimum and 10 degrees maximum. Draft angles greater than 10 degrees will not be acceptable and the link shall be rejected. 3.8 C-link and coupling plate surfaces. Flashing, burrs, irregularities, and rough edges shall be contour ground to a

38、 fair surface. No surface shall be ground after proof test of the detachable link. The forgings shall be free from surface irregularities, dents, and undercutting in excess of the amounts specified in table II (see 4.4.2). TABLE II. Allowable surface defects of forgings. Detachable link size Type I

39、(inches) Type II (size no.) Allowable surface defect (inches) 3/4 to 1-1/2 1-5/8 to 2-1/2 2-5/8 to 3-1/2 3-5/8 to 4 4-3/4 Numbers 2 to 4 Numbers 5 and 6 Numbers 7 and 8 - - 1/32 1/16 3/32 1/8 5/32 3.9 Taper pin surface. The taper pin machine surface quality shall be in accordance with the applicable

40、 drawing specified in 3.7 (see 4.4.3). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-2710C 7 3.10 Fit of coupling plates on C-link. Coupling plates shall be fitted to the C-link in accordance with the applicable drawings as specified in 3.7

41、. There shall not be any movement between the coupling plates and C-link at the C-link opening (see 4.4.6). 3.11 Taper pin engagement. The taper pin shall be driven into the assembled detachable link (see figure 2) with the required assembly punch specified in drawing 804-840327. The taper pin depth

42、 of engagement in the coupling plates shall be as specified in the drawings specified in 3.7 (see 4.4.7). 3.12 Hairpin fit. Hairpin, when specified (see 6.2), shall be installed after the taper pin is driven home (see 3.11, figure 1, and figure 2). With the hairpin fully seated in the groove of the

43、coupling plate, the ends of the hairpin shall project a minimum of 2-1/2 hairpin diameters and a maximum of 3 hairpin diameters beyond the groove of the opposite coupling plate (see 4.4.8). 3.13 Proof load. The detachable link shall withstand the proof load specified in table III (type I) and table

44、IV (type II) without developing any surface fracture or defects which would interfere with the serviceability or disassembly of the detachable link (see 4.5.3). TABLE III. Physical properties for type I detachable links. Link size (inches) Type I, class Proof load (lbs) Minimum breaking load (lbs) 3

45、/4 7/8 1 1-1/8 1-1/4 1-3/8 1-1/2 1-5/8 1-3/4 3 67,500 88,200 116,100 145,000 178,200 211,500 252,000 292,500 352,000 91,100 119,000 156,700 195,000 240,600 285,500 340,200 395,000 476,000 1-7/8 2 2-1/8 2-1/4 2-3/8 2-1/2 2-5/8 1 285,000 322,000 362,000 403,000 447,000 492,000 540,000 432,000 488,000

46、548,000 610,000 675,000 744,000 813,000 2-3/4 HD 12 649,000 981,000 2-7/8 1 640,000 965,000 3 HD 12 762,000 1,150,000 3-1/8 3-1/4 3-3/8 1 748,000 805,000 862,000 1,128,000 1,250,000 1,304,000 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-27

47、10C 8 TABLE III. Physical properties for type I detachable links - Continued. Link size (inches) Type I, class Proof load (lbs) Minimum breaking load (lbs) 3-1/2 HD12 1,080,000 1,700,000 3-5/823-3/4 3-7/82424-3/4 1 - 1,045,900 - - 1,700,000 - 1,575,000 - - 2,550,000 1HD - Heavy duty. Also can be use

48、d for class 1 corresponding size. 2Detachable links for these sizes have not been developed. The proof and minimum breaking loads will be indicated as the detachable links are developed. TABLE IV. Physical properties for type II detachable links. Link number Link size1(inches) Proof load (lbs) Minim

49、um breaking load (lbs) 2 3 4 5 6 7 8 3/4 HS - 7/8 HS 1 HS - 1-1/8 HS 1-1/4 HS - 1-1/2 HS 1-5/8 HS - 1-3/4 HS - 2 2-1/8 - 2-3/8 2-1/2 - 3-1/8 - 2-3/4 HD - 3 HD 3-1/4 - 3-1/2 - 3-1/2 HD 88,200 145,000 252,000 352,000 447,000 762,000 1,080,000 119,000 195,000 340,000 476,000 675,000 1,150,000 1,700,000 1 HS - High strength; HD - Heavy duty. 3.14 Breaking load. The detachable link shall wi