GB/T 6445-2021 in English
VALIDRolling bearings—Needle roller bearing track rollers—Boundary dimensions, geometrical product specifications (GPS) and tolerance values
- Issued on:2021-12-31
- Implemented on:2022-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/T 6445-2021滚动轴承 滚轮滚针轴承 外形尺寸、产品几何技术规范（GPS）和公差值》由TC98（全国滚动轴承标准化技术委员会）归口，主管部门为中国机械工业联合会。
Introduction
Background of Standard Revision and Technological Evolution
GB/T6445-2021, as the core standard in the field of roller and needle bearings, replaced the 2007 version and achieved three major technological breakthroughs:
| Technical Dimensions | 2007 Version | 2021 Version |
|---|---|---|
| Standard System | Not Included in the GPS System | Fully Introduced Product Geometry Technical Specification (GPS) |
| Size Range | Limited Coverage for Light Series Bearings | Expanding the Size of Light Series Retaining Ring Bearings to NATR120 |
| Tolerance accuracy | 10-30mm unified tolerance | Subdivided into 10-18mm(-12μm) and 18-30mm(-21μm) |
Analysis of core technical requirements
1. Dimension characteristic specifications
The standard clarifies 21 dimensional symbol systems through Table 1, among which the key characteristics include:
- Outer diameter tolerance ΔDmp: cylindrical and convex shapes are controlled separately (see Table 6)
- Section height Kea: detected by two-point dimensional method
- Oil hole size: new requirements for oil hole diameter of bolt-type bearings M/M1
2. Tolerance grade comparison
Typical case: KRV47 bolt-type bearing tolerance requirements:
- Outer diameter 47mm corresponds to tΔDmp≤-21μm
- Bolt diameter d1=24mm corresponds to tΔd1s≤-25μm
- Surface roughness Ra≤0.63μm
Implementation suggestions
- Design stage: Bearing models recommended in standard Table 2-5 are preferred
- Detection points: Outer diameter detection needs to distinguish between cylindrical and convex shapes, and special inspection fixtures are used
- Process control: Bolt threads are processed according to the 6g tolerance zone of GB/T197
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