ABMA 10A:2001 pdf download

ABMA 10A:2001 pdf download.Metal Balls for Unground Bearings and Other Uses ANSI/ABMA 10A:2001 (R2015)
1. Scope.
This standard establishes the requirements for metal balls for unground rolling contact bearings and other uses. The requirements for finished balls for roiling contact bearings are contained in ANSI/ABMA/ISO 3290.
2. Normative references.
The following standards contain provisions, which through reference in this text constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards below. ANSI B89.3.1-1972 (R1988), Out-Of Roundness, Measurement of ANSI/ASME B46.1-1995, Surface Texture (Surface Roughness, Waviness and Lay) ANSI/ASQC Z1.4- 1993, Sampling Procedures and Tables for Inspection by Attributes ASTM E 18-98, Test Methods for Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials ASTM E140-97e1, Hardness Conversion Tables for Metals (Relationship Between Brinell Hardness, Vickers Hardness, Rockwell Hardness, Rockwell Superficial Hardness, Knoop Hardness and Scleroscope Hardness) ASTM E384-89 (1997), Standard Test Method for Microhardness of Materials Federal Specification GGG-G-15C (March 20, 1975), Gage Blocks and Accessories (Inch and Metric) ISO 3290: 1998, Rolling bearings – Balls – Dimensions and Hardness ISO 4288: 1996, Geometrical Product Specifications (GPS) – Surface texture: Profile method – Rules and procedures for the assessment of surface texture ISO 4291: 1985, Methods for the assessment of departure from roundness – Measurement of variations in radius ISO 6508-1: 1999, Metallic materials – Hardness test – Rockwell test (scales A – B – C – D – E – F – G – H – K)
3. Definitions and symbols.
The following definitions and symbols will apply to terms used in this standard. 3.1 Nominal ball diameter, D w . The diameter value that is used for the purpose of general identification of a ball size; e.g., 1 / 4 inch, 6 mm, etc.3.9 Nominal ball diameter tolerance. The maximum allowable deviation of any ball lot mean diameter from the nominal ball diameter. 3.10 Ball grade, GxxA. Specific combination of dimensional, form, surface roughness and sorting tolerances for balls. 3.11 Surface roughness, R a . Surface irregularities with relatively small spacing, which usually include irregularities resulting from the method of manufacture being used and/or other influences. Values are expressed as arithmetic averages. 3.12 Waviness. Surface irregularities of random or periodical deviation from the spherical ideal form. (Lacking standardized practices in this field, the specifications and tolerances for waviness are subject to agreement between manufacturer and purchaser.) 3.13 Hardness. The measure of resistance to penetration of the ball surface or truncated flat of the ball by a specific indenting shape as determined by specified methods. 3.14 Case depth. The distance measured radially from the surface of the ball to a point where the hardness becomes the equivalent to 50 HRC. This term is applicable to case hardened balls only.3.15 Passivation. A chemical treatment to remove corrodible surface impurities and to provide a protective film. This term is applicable to corrosion resisting balls only.
4. Requirements
4.1 Materials. The materials listed in Table 1 are the most commonly used; however, other materials are available from individual suppliers. For typical chemical analysis and a cross reference of other applicable specifications refer to the Unified Numbering System for Metals and Alloys published by the Society of Automotive Engineers, Inc., 400 Commonwealth Drive, Warrendale, Pennsylvania, 15096. 4.2 Hardness. Hardness of balls manufactured of the materials in 4.1 shall be agreed between manufacturer and purchaser. Table 1 shows typical hardness values. Tempering of carbon steel balls for stress relief shall be subject to agreement between manufacturer and purchaser.