1、MIL-DTL-27426C22 SEPTEMBER 1998SUPERSEDINGMIL-DTL-27426B27 SEPTEMBER 1997DETAIL SPECIFICATIONRINGS, RETAINING, SPIRAL(UNIFORM CROSS SECTION)This specification is approved for use by allDepartments and Agencies of the Department of Defense.1. SCOPE1.1 Scope. This specification covers the procurement
2、requirements for uniformcross section spiral retaining rings used on shafts and in bearing housings.1.2 Classification. Retaining rings will conform to one of the followingclassifications and codes as specified (see 6.3).Type 2A01 - Medium Duty External RingsType 2A02 - Heavy Duty External RingsType
3、 2B01 - Medium Duty Internal RingsType 2B02 - Heavy Duty Internal Rings2. APPLICABLE DOCUMENTS2.1 General. The documents listed in this section are specified in sections 3and 4 of this specification. This section does not include documents in other sectionsof this specification or recommended for ad
4、ditional information or as examples. Whileevery effort has been made to ensure the completeness of this list, document users arecautioned that they must meet all specified requirements documents cited in sections 3and 4 of this specification, whether or not they are listed.2.2 Government documents.2
5、.2.1 Specifications, standards and handbooks. The following specifications,standards and handbooks form a part of this document to the extent specified herein.Unless otherwise specified, the issues of these documents are those listed in the issueof the Department of Defense Index of Specifications a
6、nd Standards (DODISS) andsupplement thereto, cited in the solicitation (see 6.2).Beneficial comments (recommendations, additions, deletions) and any pertinent datawhich may be of use in improving this document should be addressed to : the DefenseIndustrial Supply Center, (Code DISC-AESD), 700 Robbin
7、s Avenue, Philadelphia, PA19111-5096, by using the Standardization Document Improvement Proposal (DD Form 1426)appearing at the end of this document or by letter.AMSC N/A FSC 5325DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited.INCH-POUNDProvided by IHSNot for ResaleN
8、o reproduction or networking permitted without license from IHS-,-,-MIL-DTL-27426C2SPECIFICATIONSFEDERALQQ-P-35 - Passivation Treatments for Austenitic, Ferritic, andCorrosion-Resisting Steel (Fastening Devices)QQ-P-416 - Plating, Cadmium (Electrodeposited)PPP-H-1581 - Hardware (Fasteners and Relate
9、d Items), Packaging andPacking for Shipment and Storage of. (Reference)DEPARTMENT OF DEFENSEDOD-P-16232 - Phosphate Coating, heavy, Manganese or Zinc Base(for Ferrous Metals)MIL-DTL-27426/1 - Rings, Retaining, Spiral (Uniform Cross Section)Medium Duty ExternalMIL-DTL-27426/2 - Rings, Retaining, Spir
10、al (Uniform Cross Section)Heavy Duty ExternalMIL-DTL-27426/3 - Rings, Retaining, Spiral (Uniform Cross Section)Medium Duty InternalMIL-DTL-27426/4 - Rings, Retaining, Spiral (Uniform Cross Section)Heavy Duty Internal(Unless otherwise indicated, copies of specifications, standards and handbooks areav
11、ailable from the Standardization Document Order Desk, 700 Robbins avenue, Building4D, Philadelphia, PA 19111-5094.)2.3 Non-Government publications. The following document forms a part of thisspecification to the extent specified herein. Unless otherwise specified, the issuesof the documents which ar
12、e DoD adopted will be those listed in the issue of the DODISSspecified in the solicitation. Unless otherwise specified, the issues of documents notlisted in the DODISS are the issue of the documents cited in the solicitation (see6.2).AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI)ANSI B27.6 - General P
13、urpose Uniform Cross Section SpiralRetaining Rings.ANSI/ASQC Z1.4 - Sampling Procedures and Tables for Inspectionby Attributes.(Application for copies should be addressed to the American National StandardsInstitute, Inc., 11 West 42nd Street, New York, NY 10036.)AMERICAN SOCIETY FOR TESTING AND MATE
14、RIALS (ASTM)ASTM B197 - Specification for Copper-Beryllium Alloy WireASTM E18 - Test for Rockwell Hardness of Metallic Materials (DoD Adopted)(Copies of ASTM publication may be obtained from the American Society for Testingand Materials, 1916 Race Street, Philadelphia, PA 19103-1187.)Provided by IHS
15、Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-27426C3SOCIETY OF AUTOMOTIVE ENGINEERSAS3215 - Ring, Retaining-Spiral, Internal, Heavy Duty, CRESAS3216 - Ring, Retaining-Spiral, External, Heavy Duty, CRESAS3217 - Ring, Retaining-Spiral, Internal, Light Duty
16、, CRESAS3218 - Ring, Retaining-Spiral, External, Light Duty, CRESAS3219 - Ring, Retaining, Spiral, Minimum Distortion,Dimensional and Acceptance Standard forSAE 1070-1090 - Steel, Carbon, Strip, Cold Rolled, Hardened andTempered, Spring QualitySAE AMS 5866 - Steel, Corrosion Resistant, Flat Wire 18C
17、r 9.0 Ni(SAE 30302) Spring Temper (UNS S30200)(Application for copies should be addressed to the Society of AutomotiveEngineers, 400 Commonwealth Dr., Warrendale, PA 15096-0001).(Non-Government Standards and other publications are normally available from theorganizations that prepare or distribute t
18、he documents. These documents also may beavailable in or through libraries or other informational services).2.4 Order of precedence. In the event of a conflict between the text of thisdocument and the references cited herein (except for related associated specifications,specification sheets, or MS s
19、tandards), the text of this document takes precedence.Nothing in this document, however, supersedes applicable laws and regulations unless aspecific exemption has been obtained.3. REQUIREMENTS3.1 Materials. Material used in the manufacture of retaining rings shall beeither carbon steel, corrosion-re
20、sisting steel, or copper-beryllium alloy as specifiedin the contract or purchase order (see 6.2).3.1.1 Carbon steel. Carbon steel used in the manufacture of retaining ringsshall conform to the requirements of SAE 1070-1090, AISI Grade designation C1070through C1090 inclusive.3.1.2 Corrosion-resistin
21、g steel. Corrosion-resisting steel used in themanufacture of retaining rings shall conform to the requirements of AMS 5866.3.1.3 Copper-beryllium alloy. Copper-beryllium alloy used in the manufacture ofretaining rings shall conform to ASTM B197, alloy number C17200.3.2 Physical requirements. Retaini
22、ng rings shall conform to the appropriatephysical requirements specified in 3.2.1 through 3.2.3 for the type, material, andsize of ring specified (see 6.2).Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-27426C43.2.1 Carbon steel rings. Carbo
23、n steel retaining rings shall have a tensilestrength and a hardness conforming to ANSI B27.6 (reference).3.2.2 Corrosion-resisting steel rings. Corrosion resisting steel retainingrings shall meet the physical requirements of AMS5866. Material shall not be rejectedon the basis of hardness, provided t
24、hat the tensile strength requirements are met.3.2.3 Copper-beryllium alloy rings. Material used to manufacture copper-beryllium alloy retaining rings shall meet the tensile requirements of ASTM B197.3.3 Protective Finish. Protective finish shall conform to 3.3.1, 3.3.2 or 3.3.3as specified in the co
25、ntract or purchase order (see 6.2).3.3.1 Cadmium plating. Cadmium plating shall be in accordance with QQ-P-416,Type II, Class 2. NOTE: Use of this finish is not recommended.3.3.2 Phosphate coating. Phosphate coating shall be in accordance with DOD-P-16232, Type Z, Class 2.3.3.3 Passivation. Corrosio
26、n-resisting steel rings shall be passivated inaccordance with QQ-P-35.3.4 Design. The design, shape, mechanical requirements, and dimensions ofretaining rings furnished under this specification shall conform to all therequirements specified in 3.4.1 through 3.4.9 for the applicable type, class, and
27、sizeof ring.3.4.1 Type 2A01 rings. Type 2A01 rings shall conform to the dimensions,tolerance and requirements specified in MIL-DTL-27426/1.3.4.2 Type 2A02 rings. Type 2A02 rings shall conform to the dimensions,tolerances and requirements specified in MIL-DTL-27426/2.3.4.3 Type 2B01 rings. Type 2B01
28、rings shall conform to the dimensions,tolerances and requirements specified in MIL-DTL-27426/3.3.4.4 Type 2B02 rings. Type 2B02 rings shall conform to the dimensions,tolerances and requirements specified in MIL-DTL-27426/4.3.4.5 Notches and slots. All rings shall be either notched in accordance with
29、3.4.5.1 or slotted to facilitate removal of the rings from the grooves, using ascrewdriver or similar common type tool. Special removal tools shall not be required.Ring sizes 2.750 inches and smaller shall be notched. Unless specified in contract ororder (see 6.2), ring sizes 2.812 inches and larger
30、 may be notched or slotted at theoption of the manufacturer.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-27426C53.4.5.1 Notches. Notches in the rings shall conform to AS3215 through AS3218 asappropriate to the type of ring.3.4.6 Edges. The
31、 I.D. and O. D. circumferential edges of the ring materialshall be rounded. These edges shall be free from burrs, slivers, dents, nicks, cracksand other irregularities that may adversely affect the ring performance. Unlessotherwise stipulated in the contract, burrs at the end and notch areas of the
32、ring areacceptable within the limits shown in Table I.TABLE IMATERIAL THICKNESS MAXIMUM ACCEPTABLE BURR(AT NOTCH ENDS ONLY).009” TO .018” .002”.019” TO .030” .003”.031” TO .043” .004”.044” AND OVER .005”3.4.7 Crimp. Unless otherwise stipulated in the contract, rings shall becrimped according to Tabl
33、e II.TABLE IIRING TYPE RING SIZES NOT CRIMPEDDASH NUMBERSRING SIZES CRIMPEDDASH NUMBERS2A01 0100 0136 0137 - 02472A02 0100 0106 0107 02062B01 0100 0138 0139 02612B02 0100 - 0105 0106 - 02123.4.7.1 Crimp Height. The crimp height is equal to the ring thickness with thetolerances shown in Table III.TAB
34、LE IIIRING THICKNESS CRIMP HEIGHT TOLERANCE.000” - .044” +.002”/-.004”.045” - .066” +.003”/-.005”.067” AND OVER +.005”/-.007”3.4.7.2 Crimp length and radius. The crimp length and radius shall meet thespecifications shown in Table IV.TABLE IVMATERIAL THICKNESS CRIMP LENGTH CRIMP RADIUSUP TO .021” .09
35、5” MAX .015.022” - .031” .187” MAX. .015.032” - .055” .218” MAX. .031.056” TO .080” .312” MAX. .031.081” AND OVER .375” MAX. .031Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-27426C63.4.8 Dish. Dish shall be considered the height difference
36、 in the ring cross-sections axis of symmetry between the I.D. and O.D. as illustrated inFigure 1. Dish shall be minimized to the extent possible and not exceed the values ofTable V.FIGURE 1TABLE VRING RADIAL WALL MAX. ALLOWABLE DISH.000” - .039” .001”.040” - .069” .002”.070” - .099” .003”.100” - .12
37、9” .004”.130” - .159” .005”.160” - .194” .006”.195” .224” .007”.225” - .259” .008”.260” - .294” .009”.295” - .339” .010”.340” - .394” .011”.395” - .474” .012”.475” - .649” .013”.650” 1.000” .014”Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL
38、-27426C73.4.9 Misalignment. Misalignment is defined as the radial mismatch between theadjacent leaves of a retaining ring in the free state. This condition is illustratedin Figure 2. Misalignment is based on the nominal shaft/housing diameter that theretaining ring is designed for. Acceptable limits
39、 are shown in Table VI.FIGURE 2TABLE VINOMINAL HOUSING/SHAFT DIA. MAX. MISALIGNMENT.50” 1.00” .015”1.01” 2.00” .025”2.01” 6.00” .045”6.01” 10.00” .070”10.01” 15.00” .100”3.5 Performance. Retaining rings shall pass the performance test of 4.2.4.2.3.6 Workmanship. Workmanship shall be of a quality whi
40、ch will insure compliancewith all the requirements of this specification. Each retaining ring shall be freefrom hanging burrs and slivers, gouges, porosity, cracks, objectionable scale, or anyother defects which may adversely affect the rings serviceability.4. VERIFICATION4.1 Classification of inspe
41、ctions. The inspection requirements specified hereinare classified as follows:a. Conformance inspection. (See 4.2).4.2 Conformance inspection. Conformance inspection shall include theexamination of 4.2.1 and 4.2.2.4.2.1 Lot. A lot shall consist of all items of the same type, size, material,and finis
42、h manufactured under essentially the same conditions.4.2.2 Examination. Sample retaining rings shall be selected from each lot inaccordance with Table VII, C=0 sampling plan or ANSI/ASQC Z1.4, for examination inaccordance with 4.2.3.1 and 4.2.3.2Provided by IHSNot for ResaleNo reproduction or networ
43、king permitted without license from IHS-,-,-MIL-DTL-27426C84.2.3.1 Retaining rings. Sample retaining rings shall be visually anddimensionally examined to verify compliance with the requirements of sections 3.4 and3.6 of this specification. The rings shall be accepted or rejected in accordance withth
44、e requirements of the C=0 Sample Plan (shown in Table VII) using an AQL level asspecified in Table VIII or ANSI/ASQC Z1.4.4.2.3.2 Packaging inspection. The preservation, packing and marking shall beinspected to verify conformance to the requirements of section 5.4.2.4 Tests. A sample shall be select
45、ed from each lot and tested in accordanceto the requirements below. Acceptance will be a pass/fail criteria.TABLE VII. C=0 SAMPLING PLANASSOCIATED AQL .010 .015 .025 .040 .065 .10 .15 .25 .40 .65 1.0 1.5 2.5 4.0 6.5 10.0LOT SIZE SAMPLE SIZE2 TO 8 * * * * * * * * * * * * 5 3 2 29 TO 15 * * * * * * *
46、* * * 13 8 5 3 2 216 TO 25 * * * * * * * * * 20 13 8 5 3 2 226 TO 50 * * * * * * * * 32 20 13 8 5 5 3 351 TO 90 * * * * * * 80 50 32 20 13 8 7 6 5 491 TO 150 * * * * * 125 80 50 32 20 13 12 11 7 5 5151 TO 280 * * * * 200 125 80 50 32 20 20 19 13 10 6 6281 TO 500 * * * 315 200 125 80 50 48 47 29 21 1
47、6 11 7 7501 TO 1200 * 800 500 315 200 125 80 75 73 47 34 27 19 15 8 81201 TO 3200 1250 800 500 315 200 125 120 116 73 53 42 35 23 18 9 93201 TO 10,000 1250 800 500 315 200 192 189 116 86 68 50 38 29 22 11 910,001 TO 35,000 1250 800 500 315 300 294 189 135 108 77 60 46 35 29 13 935,001 TO 150,000 125
48、0 800 500 490 476 294 218 170 123 96 74 56 40 29 15 9150,001 TO 500,000 1250 800 750 715 476 345 270 200 156 119 90 64 40 29 15 9500,001 AND OVER 1250 1200 1112 715 556 435 303 244 189 143 102 64 40 29 15 9*Indicates entire lot must be inspected.NOTE: The Acceptance Number in all cases is ZERO.Provi
49、ded by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-27426C9Table VIII. C=0 Sampling Plan AQL LevelsKey CharacteristicsDiameterAQL LevelsCpk 1.67 and above: 1.0Cpk 1.66 to 1.00: .25Cpk less than 1.00: 100% inspectionMajor CharacteristicsThicknessRadial WallBurrDishMisalignmentCrimp4.04.04.04.04.04.0Minor CharacteristicsNotch Radius 10.0*Cont
