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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Hardness The measure of resistance to penetration of the ball surface or truncated flat of the ball by a specific indenting shape. The radial distance between the smallest circumscribed sphere and the greatest inscribed sphere, with their centers common to the least squares sphere centre.

Measured by two parallel plane tangent to the surface of the ball.

The h1501 by which the mean diameter of ball lot should differ from the nominal ball diameter, this amount being one of an established series. Our trained engineers also work closely with our customers to develop products most suitable for their applications. The difference between the mean diameters of the largest ball and the smallest ball in a ball lot.

Lot is the definite quantity of ball manufactured under uniformed condition.

Element, irregularity or group elements and irregularities of the real surface, unintentionally or accidentally caused during manufacture, storage, handling or use of the surface.

And it is conventionally defined within the area where deviation of form are eliminated. The mean diameter of a ball shall be corrected taking into account the elastic approach value due to jid measuring force and also, as s rule, the elastic approach value due to the mass of the steel ball.

This term is applicable to case hardened ball only.

The hardness of steel balls n1501 than 3mm shall b15501 measured in accordance with JIS Z 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.

The method of evaluating the deviation from spherical form of a steel ball shall be in accordance with JIS B appendix A.

The difference between the mean diameter of a ball lot and the sum of the nominal ball diameter and the ball gauge. Lot Diameter Variation The difference between the mean diameter of the largest ball and that of the smallest ball in the lot.

A definite quantity of balls manufactured under conditions presumed uniform and which is considered as an entity. Sphericity The greatest radial distance in any radial plane between a sphere circumscribed around the ball surface and any point on the ball surface. The designations which is used for the purpose of general identification of a steel ball by dimension.

The diameter necessary for determining the mean diameter of a ball and the n1501 diameter variation shall be measured with the ball placed between the horizontal plane and the stylus applied vertical to b15001 from different directions.

## Precision Hardened Balls – Metric / Inch

Diameter Tolerance The maximum allowable deviation of any ball mean diameter from the nominal ball diameter. The ball diameter variation, sphericity and surface roughness of the steel balls shall comply with Attached Table 2.

This Japanese Industrial Standard specifies requirements for finished steel balls for rolling bearings. Case Depth The distance measured radially from the surface of the ball to the point where the ball hardness becomes Rc The arithmetical mean of the mean diameters of the largest ball and the smallest ball in a ball lot. Surface Roughness Surface roughness consists of all those irregularities such as crack,cuts and dent,which surface relief.

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

B15011 Diameter of a Ball The arithmetical mean of the largest and the smallest single diameter of the ball. The principal terms, quantitative symbols and definitions used in this Standard shall be as follows. The various types of deviation from the perfect spherical ball surface, uniformly or non-uniformly distributed and repeated around the ball surface.

Ball grade is indentified by the letter G and a number.

A specific combination of dimensions, form, surface roughness and sorting tolerances. Grade A specific combination of dimensional form and surface roughness tolerance Nomintal ball Diameter The diameter value that is used for jia purpose of general identification of a ball size.

Lot Mean Diameter The arithmetical mean of the mean diameter of the largest ball and that of the smallest balls in the lot. Waviness components on the surface of a ball are usually measured with a waviness-meter using jix filter.