BS ISO 3245-2007.Rolling Bearings – Needle Roller Bearings, Drawn Cup Without Inner Ring – Boundary Dimensions And Tolerances.
ISO 3245:2007 specifies the boundary dimensions and preferred dimensions to be used for drawn cup needle roller bearings without inner ring as well as the minimum chamfer dimension limits. Also specified are the closed end thickness dimensions for bearings with closed end drawn cups.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 286-2:1988, Iso system of limits and fits — Part 2: Tables of standard tolerance grades and limit deviations for holes and shafts
ISO 1132-1, RoIling bearings — Tolerances — Part 1: Terms and definitions
ISO 1132-2:2001, Rolling bearings — Tolerances — Part 2: Measuring and gauging principles and methods
ISO 5593, RoIling bearings — Vocabulary
ISO 10579, Technical drawing — Dimensioning and tolerancing — Non-rigid parts
ISO 15241, RoIling bearings — Symbols for quantities
5 Boundary dimensions
The boundary dimensions of drawn cup needle roller bearings, without inner ring, closed end and open ends, of diameter series 1 D are given in Table 1, those of diameter series 2D are given in Table 2.
The maximum limits of C1 and C2 are given to enable the user to avoid contact between the end face of the shaft and the internal end face of the drawn cup. If contact between these faces is required, the user should consult the bearing manufacturer.
6 Tolerances
6.1 Tolerances for the bore diameter of needle roller complement
Drawn cup needle roller bearings are non-rigid parts according to the definition in ISO 10579 and require the outside diameter of the drawn cup to be restrained in a ring gauge for verification of the bore diameter of the needle roller complement.
The free state condition defined in ISO 10579 is valid for the tolerances applied to dimensions C, C1, C2 .
The tolerances given in Tables 3 and 4 for the smallest single bore diameter of needle roller complement, F5 mm’ are valid on the condition that the drawn cup is pressed into a ring gauge having a radial cross- section as specified in ISO 1132-2:2001, 7.4 and 7.5. The bore diameter of the ring gauge shall be in accordance with Tables 3 and 4.iso 3245 pdf download.