JIS B Rolling bearings — Balls (Foreign Standard). standard by Japanese Industrial Standard / Japanese Standards Association. Standards and specifications are regulated in accordance with JIS B The nominal manufacturing sizes of steel balls are shown in the. JIS B Rolling bearings — Balls (Foreign Standard). Available for Subscriptions. Content Provider Japanese Industrial Standards [JIS].
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Precision Hardened Balls – Metric / Inch
This Japanese Industrial Standard specifies requirements for finished steel balls for rolling bearings. Ball grade is indentified by the letter G and a number.
The mean diameter of a ball shall be obtained in the form of the arithmetic mean of the b151 and smallest actual single diameters, and the ball diameter variation shall be obtained in the form of the difference between the largest and smallest actual single diameters. The mean diameter of a ball shall be corrected taking into account the elastic approach value due to the measuring force and also, as s rule, the elastic approach value due to the mass of the steel ball.
Waviness components on the surface of a ball are usually measured with a waviness-meter using a filter. The hardness of steel balls larger than 3mm shall be measured in accordance with JIS Z The principal terms, quantitative symbols and definitions used in this Standard shall be as follows.
The designations which is used for the purpose of b15001 identification of a steel ball by dimension. The various types of deviation from the perfect spherical ball surface, uniformly or non-uniformly distributed and repeated around the ball surface.
*NA BALL, STEEL JIS B(7 – na – Doosan spare part | parts
The radial distance between the smallest circumscribed sphere and the greatest inscribed sphere, with their centers common to the least squares sphere centre. Element, irregularity or group elements and irregularities of the real surface, unintentionally or accidentally caused during manufacture, storage, handling or use of the surface.
A definite quantity of balls manufactured under conditions presumed uniform and which is considered as an entity. The arithmetical mean of the mean diameters of the largest ball and the smallest ball in a ball lot. The difference between the mean diameters of the largest ball and the smallest ball in a ball lot. A specific combination of dimensions, form, surface roughness and sorting tolerances. The amount by which the mean n1501 of ball lot should differ from the nominal ball diameter, this amount being one of an established series.
JIS B – Rolling bearings — Balls (Foreign Standard)
The difference between the mean diameter of a ball lot and the sum of the nominal ball diameter and the ball gauge. B151 ball diameter variation, sphericity and surface roughness of the steel balls shall comply with Attached Table 2. The diameter necessary for determining the mean diameter of a ball and the ball diameter variation shall be measured with jus ball placed between the horizontal plane and the stylus applied vertical to it from different directions.
The method of evaluating the deviation from spherical form of a steel ball shall be in accordance with JIS B appendix A.