1、Comments, suggestions, or questions on this document should be addressed to: Commander, Naval Sea Systems Command, ATTN: SEA 05Q, 1333 Isaac Hull Avenue, SE, Stop 5160, Washington Navy Yard DC 20376-5160 or emailed to commandstandardsnavsea.navy.mil, with the subject line “Document Comment”. Since c
2、ontact information can change, you may want to verify the currency of this address information using the ASSIST Online database at http:/assist.daps.dla.mil AMSC N/A FSC 3130 INCH-POUND MIL-DTL-17901C(SH) 10 May 2005 SUPERSEDING MIL-B-17901B(SH) AMENDMENT 3 12 December 1990 DETAIL SPECIFICATION BEAR
3、ING COMPONENTS, BONDED SYNTHETIC RUBBER, WATER LUBRICATED This specification is approved for use by the Naval Sea Systems Command, Department of the Navy, and is available for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers stave shaped
4、 and cylindrical shaped bearings that have synthetic rubber facings. 1.2 Classification. Bearings are of the following classes, as specified (see 6.2): 1.2.1 Classes. (Note: Class I replaced with class III). Class II - Cylindrical bearing, with cylindrical shaped metal backing and internally molded
5、rubber stave forms. Class III - Stave bearing, nonmetallic backed. Class IV - Cylindrical bearings, with cylindrical shaped nonmetallic backing and internally molded rubber stave forms. Class V - Partial-arc bearing consisting of nonmetallic half cylinders with internally bonded rubber. 2. APPLICABL
6、E DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3, 4, or 5 of this specification. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made t
7、o ensure the completeness of this list, document users are cautioned that they must meet all specified requirements of documents cited in sections 3, 4, or 5 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications, standards, and handbooks. The following
8、 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 cited in the solicitation or contract. FEDERAL SPECIFICATIONS QQ-B-639 - Brass, Naval: Flat Products (Plate, Bar, Sheet, and Stri
9、p) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-17901C(SH) 2 FEDERAL STANDARDS FED-STD-791 - Lubricants, Liquid Fuels, and Related Products; Methods of Testing DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-P-18324 - Plastic Material, Laminated
10、Phenolic, For Bearings (Water or Grease Lubrication) (Copies of these documents are available online at http:/assist.daps.dla.mil/quicksearch/ or http:/assist.daps.dla.mil or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.2.2 Other Gove
11、rnment documents, drawings, and publications. The following other Government documents, drawings, and publications 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 contract. NAVSEA DRAWING NAVSH
12、IPS 803-1385664 - Bearings Stern Tube and Strut (Copies of this document are available from Naval Inventory Control Point, 700 Robbins Avenue, Attn: Code 0862 (Cash Sales), Philadelphia, PA 19111, or www.nll.navsup.navy.mil.) 2.3 Non-Government publications. The following documents form a part of th
13、is document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI) B74.12 - Specifications for the Size of Abrasive Grain Grinding Wheels, Polishing and General Industrial
14、 Uses (DoD adopted) (Copies of this document are available from the American National Standards Institute, Inc., 25 West 43rdStreet, 4thFloor, New York, NY 10036 or online at www.ansi.org.) ASTM INTERNATIONAL B21 - Standard Specification for Naval Brass Rod, Bar, and Shapes (DoD adopted) B584 - Stan
15、dard Specification for Copper Alloy Sand Castings for General Applications (DoD adopted) D256 - Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics (DoD adopted) D412 - Standard Test Methods for Vulcanized Rubber and Thermoplastic Elastomers - Tension (DoD adopted)
16、D471 - Standard Test Method for Rubber Property - Effect of Liquids (DoD adopted) D570 - Standard Test Method for Water Absorption of Plastics (DoD adopted) D638 - Standard Test Method for Tensile Properties of Plastics D790 - Standard Test Methods for Flexural Properties of Unreinforced and Reinfor
17、ced Plastics and Electrical Insulating Materials D1141 - Standard Practice for the Preparation of Substitute Ocean Water (DoD adopted) D2240 - Standard Test Method for Rubber Property - Durometer Hardness (DoD adopted) Provided by IHSNot for ResaleNo reproduction or networking permitted without lice
18、nse from IHS-,-,-MIL-DTL-17901C(SH) 3 D3183 - Standard Practice for Rubber - Preparation of Pieces for Test from Products (DoD adopted) (Copies of these documents are available from ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, or online at www.astm.org.)
19、INTERNATIONAL STANDARDS ORGANIZATION (ISO) ISO 2230 - Rubber Products Guidelines for Storage (Copies of this document are available from ISO, 1, rue de Varemb, CH-1211 Geneva 20, Switzerland, or online at www.iso.org.) 2.4 Order of precedence. In the event of a conflict between the text of this docu
20、ment 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. REQUIREMENTS 3.1 Qualification. The bearings furnished under this specification shall be p
21、roducts that are manufactured by a manufacturer authorized by the qualifying activity for listing on the applicable qualified manufacturers list before contract award (see 4.2 and 6.3). 3.2 Bearing material and identification. The following information shall be stamped on each bearing as follows: a.
22、 Class II: Manufacturer identification, date of manufacture, size (outside diameter and inside diameter). The letters shall be at least 1/10inch in height; stamped, etched, or engraved; and readily visible to the unaided eye. The markings shall not interfere with the installation or performance of t
23、he bearing. Flanged bearings are marked on the end of the flange; sleeved bearings are marked on the outside diameter. b. Class III: Manufacturer identification, use by month and year (i.e., 5-99), cross section size, and batch number, also special information such as “1/16oversize” (for example: “R
24、CN010A112 1/16oversize”). The letters shall be at least inch in height and readily visible to the unaided eye. Starting near one end of the stave the above information shall be stamped at 2-foot intervals along the back of the stave. The markings shall be on the back and not interfere with the insta
25、llation or performance of the bearing. c. Class IV: Manufacturer identification, date of manufacture, size (outside diameter and inside diameter). The letters shall be at least 1/10inch in height; permanent ink, stamped, etched, or engraved; and readily visible to the unaided eye. The markings shall
26、 not interfere with the installation or performance of the bearing. Sleeved bearings are marked on the outside diameter. d. Class V: Manufacturer identification, date of manufacture, outside diameter, inside diameter, length, unique serial number with 1 or 2 for each half of a matched set. All infor
27、mation shall be permanent ink or engraved into the back of the bearing and shall be a minimum of inch in height. The markings shall not interfere with the installation or performance of the bearing. 3.2.1 Physical requirements for bearing facing material. The facing material shall be a synthetic rub
28、ber compound and shall conform to the physical requirements in Table I. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-17901C(SH) 4 TABLE I. Physical requirements for bearing facing material. Property Units of measurement Test in accordance
29、with Class II Class III Class IV Class V Tensile strength before aging LB/IN2 Method A of ASTM D412 1500 min 1500 min 1500 min 1500 min Elongation before aging Percent Method A of ASTM D412 150 min 150 min 150 min 150 min Hardness Instantaneous Shore A ASTM D2240, Type A 65 min 75 max 80 min 90 MAX
30、65 min 75 max 80 min 90 max Tensile strength after aging LB/IN2Method A of ASTM D412 1/ 1/ 1/ 1/ Elongation after aging Percent Method A of ASTM D412 1/ 1/ 1/ 1/ Surface finish Microinches Ra 4.5.2.1 64 max 64 max 64 max 64 max Volume change Percent increase in volume 4.6.4 +5%, -0% +5%, -0% +5%, -0
31、% +5%, -0%1/After being subjected to the oven aging test as specified in 4.6.2.1 the rubber material shall not vary more than 25 percent from the initial tensile strength and elongation. 3.2.2 Metal parts for class II bearings. Metal parts for class II bearings shall be casting or tubing. Casting an
32、d tubing shall be in accordance with the chemical requirements of UNS C85700, C90300, or C92200 according to ASTM B271, B505, or B584 (static, centrifugal, or continuous casting), or C46400 (ASTM B21 or QQ-B-639). 3.2.3 Nonmetallic backing for class III bearing staves, class IV cylindrical bearings,
33、 and class V partial-arc bearings. Non-metallic backing for class III bearing staves, class IV cylindrical bearings, and class V partial-arc bearings shall meet the physical requirements in accordance with Table II. TABLE II. Physical requirements for nonmetallic backing. (class III, class IV, and c
34、lass V bearings only) Property Units of measurement Class III required test value Class IV required test value Class V required test value Test in accordance with Remarks Hardness Shore D 64 min 85 max 70 min 100 max 70 min 100 max ASTM D2240 Sample size per Table VI Tensile strength LB/IN23900 min
35、24,000 min 15,000 min in hoop direction 2500 min in axial direction1/ASTM D638 - Yield LB/IN22600 min - - ASTM D638 - Flexural modules Secant modules measured at a max 1 percent strain LB/IN245,000 at 73 F min - 1900000 min in hoop direction 500000 min in axial direction2/ASTM D790 - Provided by IHS
36、Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-17901C(SH) 5 TABLE II. Physical requirements for nonmetallic backing - Continued. (class III, class IV, and class V bearings only) Property Units of measurement Class III required test value Class IV required
37、test value Class V required test value Test in accordance with Remarks Impact resistance FT-LB/IN 0.8 min - - ASTM D256 10 Samples tested with Method “A” and A 45-degree notch Water absorption Percent of specimen volume 0.2 Percent max 1.0 Percent max gain 0.2 Percent max gain ASTM D570 Immersed 24
38、hours at a water temperature of 75 + 5 F Oil absorption Percent of specimen volume 1.0 Percent max 1.0 Percent max gain 1.0 Percent max gain 4.6.4.1 and 4.6.4.3 - 1/Ultimate tensile strength is derived from the flexural modulus results. 2/The specimens shall be curved. The hoop and axial specimens s
39、hall have a span to depth ratio of 16:1. See 4.4.6.b. 3.2.4 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible, provided that the material meets or exceeds the operations maintenance
40、 requirements, and promotes economically advantageous life cycle costs. 3.3 General requirements. The class, type, size, dimensions and dimensional tolerances shall be as specified (see 6.2). (Type is a subdivision of class that is flanged, unflanged, optional design type I, II, or III as identified
41、 in Drawing 803-1385664. Size refers to basic dimensions that determine bearing size that is shaft sleeve diameter, bearing length.) 3.3.1 Manufacturing of bearings. Unless otherwise specified (see 6.2), stern tube and strut bearings shall be manufactured and fabricated in accordance with Drawing 80
42、3-1385664, except class V. Class V bearing drawings are to unique to each application, there is no standard drawing. 3.4 Bond life. The adhesive, which bonds the rubber facing to the bearing backing, shall maintain the bond for the life of the bearing and shall not show signs of separation along the
43、 edges. Bearing test specimens when subjected to pull tests shall meet the requirements in accordance with 3.4.1 through 3.4.5, except for class V bearings that shall meet the requirements of paragraph 3.4.6. Test specimens shall not be subjected to more than one type of aging per specimen. 3.4.1 Ad
44、hesion before aging. The adhesion of the rubber facing material to the backing for each strip shall have a minimum value not less than 20.0 pounds when tested in accordance with 4.6.5. 3.4.2 Adhesion after oven aging. The adhesion of the rubber facing material to the backing for each strip shall hav
45、e a minimum value not less than 20.0 pounds when tested after being subjected to warm circulating air for 96 hours in accordance with 4.6.5.1 and tested in accordance with 4.6.5. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-17901C(SH) 6 3.
46、4.3 Adhesion after oil immersion. The adhesion of the rubber facing material to the backing for each strip after oil immersion for 46 hours in accordance with 4.6.5.2 shall have a minimum value not less than 20.0 pounds when tested in accordance with 4.6.5. 3.4.4 Adhesion after seawater immersion. T
47、he adhesion of the rubber facing material to the backing for each strip shall be tested after immersion in seawater for 45 days and shall have a minimum value not less than 20.0 pounds when prepared in accordance with 4.6.5.3 and tested in accordance with 4.6.5. 3.4.5 Adhesion after thermal cycling.
48、 The adhesion of the rubber facing material to the backing for each strip, after thermal cycling in accordance with 4.6.5.4 shall have a minimum value not less than 20.0 pounds when tested in accordance with 4.6.5. 3.4.6 Adhesion requirements for class V bearings. The following criteria shall be use
49、d to determine the acceptance of adhesive bond for class V bearings when tested in accordance with 4.6.5. a. A minimum time-average value of 20 pounds or greater for a test strip is acceptable. b. If any test strip yields a time-average value less than 20 pounds but greater than 16 pounds, then all test strip values for the part (up to three values) shall be averaged. The adhesion test results shall be considered acceptable if the calculated
