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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Case Depth The distance measured radially from the surface of the ball to the point where the ball hardness becomes Rc A definite quantity of balls manufactured under conditions presumed uniform and which is considered as an entity. Mean Diameter of a Ball The arithmetical mean of the largest and the smallest single diameter of the ball. Sphericity The greatest radial distance in any radial plane between a sphere circumscribed around the ball surface and any point on the ball surface.

## Precision Hardened Balls – Metric / Inch

The various types of deviation from the perfect spherical ball surface, uniformly or non-uniformly distributed and repeated around the ball surface.

The diameter necessary for ji the mean diameter of a ball and the ball diameter variation shall be measured with the ball placed between the horizontal plane and the stylus applied vertical to it from different directions.

A specific combination of dimensions, form, surface roughness and sorting tolerances. The method of evaluating the deviation from spherical form of a steel ball shall be in accordance with JIS B appendix A.

Lot Diameter Variation The difference between the mean diameter of the largest ball and that of the smallest ball in the lot. This term is applicable to case hardened ball only. The arithmetical mean of the mean diameters of the largest ball and the smallest ball in a ball lot.

### *NA BALL, STEEL JIS B(7 – na – Doosan spare part | parts

The difference between the mean diameters of the largest ball and the smallest ball in a ball lot. Lot Mean Diameter The arithmetical mean of the mean diameter g1501 the largest ball and that of the smallest balls in the lot. Surface Roughness Surface roughness consists of all those irregularities such as crack,cuts and dent,which surface relief.

Lot is the definite quantity of ball manufactured under uniformed condition. The principal terms, quantitative symbols and definitions used in this Standard shall be as follows. Hardness The measure of resistance to penetration of the ball surface or truncated flat of the ball by a specific indenting shape.

Jks designations which is used for the purpose of general identification of a steel ball by dimension. This Japanese Industrial Standard specifies requirements for finished steel balls for rolling bearings. The difference between the mean diameter of a ball lot and the sum of the nominal ball diameter and the ball gauge.

Waviness components on the surface of a ball are usually measured with a waviness-meter using a filter. Ball grade is indentified by the letter G and a number.

### JIS « Amatsuji Steel Ball Mfg. Co., Ltd.

The ball diameter variation, sphericity and surface roughness of the steel balls shall comply with Attached Table 2.

The amount by which the mean diameter of ball lot should differ from the nominal ball diameter, this amount being one of an established series. Measured by two parallel plane tangent to the surface of the ball. Our trained engineers also work closely with our customers to develop products most suitable for their applications. Kis mean diameter of a ball shall be corrected jus 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.

The radial distance between the smallest circumscribed sphere and the greatest inscribed sphere, with their centers common to the least squares sphere centre.

And it is conventionally defined within the area where deviation of form are eliminated. The hardness of steel balls larger than 3mm shall be measured in accordance with JIS Z Grade A specific combination of dimensional form and surface roughness tolerance Nomintal ball Diameter The diameter value that is used for the purpose of general identification of a ball size.

The mean diameter of a ball shall be obtained in the form of the arithmetic mean of the largest 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.

Diameter Tolerance The maximum allowable deviation of any ball mean diameter from the nominal ball diameter. Element, irregularity or group elements and irregularities of the real surface, unintentionally or accidentally caused during manufacture, storage, handling or use of the surface.