Standard No.:	JB/T 10857-2008
English Name:	Rolling bearings—Disc bearings for agricultural machinery
Chinese Name:	滚动轴承 农机用圆盘轴承
Chinese Classification:	J11    Rolling bearing
Professional Classification:	JB    Professional Standard - Machinery
ICS Classification:	21.100.20 21.100.20    Rolling bearings 21.100.20
Issued by:	NDRC
Issued on:	2008-03-12
Implemented on:	2008-9-1
Status:	valid
Language:	English
File Format:	PDF
Word Count:	4000 words
Price(USD):	100.0
Delivery:	via email in 1 business day

1 Scope This standard specified the structural types, designation methods, boundary dimensions and technical conditions of disc bearings for agricultural machinery (hereinafter referred to as “bearings”). This standard is applicable to production, inspection and customer’s type selection and acceptance of disc harrow (plough) bearings for agricultural machinery. Bearings of other types for agricultural machinery may also refer to this standard. 2 Normative References The provisions of following documents are recognized as the provisions of this standard after quoting. All dated reference, subsequent amendments (excluding corrections), or revisions are not suitable for this. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest edition of these documents applies. For undated references, the latest edition of the normative document referred to applies. GB/T 272-1993 Rolling Bearing-Identification Code GB/T 276-1994 Rolling Bearings-Deep Groove Ball Bearings-Boundary Dimensions GB/T 307.2-2005 Rolling Bearings-Measuring and Gauging Principles and Methods (ISO 1132-2: 2001, Rolling Bearings-Tolerances-Part 2: Measuring and Gauging Principles and Methods, MOD) GB/T 708-2006 Dimension Shape Weight and Tolerance for Cold-rolled Steel Plates and Sheets GB/T 4199-2003 Rolling Bearings-Tolerances-Definitions (ISO 1132-1: 2000, Rolling Bearings-Tolerances-Part 1: Terms and Definitions, MOD) GB/T 4604-2006 Rolling Bearings-Radial Internal Clearance (ISO 5753: 1991, MOD) GB/T 6930-2002 Rolling Bearings-Vocabulary (ISO 5593: 1997, IDT) GB/T 7324-1994 General Purpose Lithium Lubricating Grease GB/T 7811-2007 Rolling Bearings-Symbols for Quantities (ISO 15241: 2001, IDT) GB/T 8597-2003 Rolling Bearings-Rust Proof Packaging GB/T 13237-1991 Cold-rolled Quality Carbon Structural Steel Sheets and Strips GB/T 18254-2002 High-carbon Chromium Bearing Steel JB/T 1255-2001 Specification for Heat-treatment of Rolling Bearing Parts Made from High Carbon Chromium Steel JB/T 2974-2004 Rolling Bearings-Identification Code-Supplemental Regulations JB/T 3573-2004 Rolling Bearings-Methods for the Measurement of Radial Internal Clearance JB/T3574-1997 Rolling Bearings-Marking for Products JB/T 6639-2004 Rolling Bearing Parts-Skeleton Acrylonitrile-buta-diene Copolymers Seal-Specifications JB/T 6641-2007 Rolling Bearings-Residual Magnetism and Its Assessment Method JB/T 7048-2002 Rolling Bearing Parts-Plastic Cage-Specifications JB/T 7051-2006 Rolling Bearing Parts-Methods for the Measurement and Assessment of Surface Roughness JB/T 8921-1999 Rolling Bearings and Commercial Parts-Inspection Rules

Contents Foreword I 1 Scope 2 Normative References 3 Terms, Definitions and Symbols 3.1 Terms and Definitions 3.2 Symbols (see Figure 1~Figure 10) 4 Designation Methods 4.1 Basic Code 4.2 Suffix Code 5 Boundary Dimensions 6 Technical Requirements 6.1 Material and Heat Treatment 6.2 Tolerances 6.3 Surface Roughness 6.4 Internal Clearance 6.5 Residual Magnetism 6.6 Lubrication and Sealing 6.7 Others 7 Test Methods 8 Inspection Rules 9 Marking 10 Packaging Appendix A (Informative) Boundary Dimension of Common Bearings A.1 Bearing with Cylindrical Bore A.2 Bearing with Square Bore A.3 Hexagonal-bore Bearing Appendix B (Informative) Slurry Test B.1 Test Purpose B.2 Test Device (See Figure B.1) B.3 Test Conditions B.4 Rest Methods Figure 1 DC...PP Type DS...PP Type Figure 2 DC...PP/R Type DS...PP/R Type Figure 3 DC...PPWB Type DS...PPWB Type Figure 4 DC...PPWB/R Type DS...PPWB/R Type Figure 5 DC...SQ-PP Type DS...SQ-PP Type Figure 6 DC...SQ-PP/R Type DS...SQ-PP/R Type Figure 7 DC...SQ-PPWB Type DS...SQ-PPWB Type Figure 8 DC...SQ-PPWB/R Type DS...SQ-PPWB/R Type Figure 9 DC...HX-PPWB Type DS...HX-PPWB Type Figure 10 DC...HX-PPWB/R Type DS...HX-PPWB/R Type Figure B.1 Diagram for Test Device Table 1 Type Code Table 2 Suffix Code Table 3 Inner Ring Table 4 Outer Ring Table 5 Sampling Inspection Items Table A.1 Bearing with Cylindrical Bore (Inner Ring Width Equals to the Outer Ring Width) Table A.2 Bearing with Cylindrical Bore (Wide Inner Ring) Table A.3 Bearing with Square Bore (Inner Ring Width Equals to the Outer Ring Width) Table A.4 Bearing with Square Bore (Wide Inner Ring) Table A.5 Hexagonal-bore Bearing (Wide Inner Ring)