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Each size has a specific tilt angle (often between 5° and 15°). Many engineers assume all spherical bearings tilt ±12°, but small bearings may tilt less. Check Table 3 in the DIN 648 PDF.
DIN 648 categorizes spherical plain bearings into specific series:
Modern rod ends based on DIN 648 standards are available in several material pairings: din 648 pdf
: Ask a technical university library if you can view their licensed copy of DIN 648 online. Many provide public terminals.
: Known as the "narrow" series. It has a slimmer profile, making it ideal for tight installation spaces in pneumatics and plant engineering. Materials and Lubrication Each size has a specific tilt angle (often
DIN 648 is a German standard that specifies the dimensions and tolerances for , specifically focusing on finished shafts and the necessary relief grooves (often referred to as undercutting).
In mechanical design, a shaft is not merely a cylindrical rod; it is a complex component that interfaces with bearings, gears, pulleys, and seals. To ensure these components fit correctly, engineers must machine specific features into the shaft. DIN 648 provides the standardized geometry for relief grooves, particularly those used to allow grinding wheels to exit the workpiece without leaving a radius that would interfere with the assembly of mating parts. DIN 648 categorizes spherical plain bearings into specific
: Purchase the official DIN 648 PDF from Beuth Verlag. Consider buying the English version ("DIN 648: Spherical plain bearings — Dimensions and loads"). The cost is minimal compared to a product recall due to a dimension error from a bootleg copy.
traditionally specified dimensions and technical requirements for rod ends and spherical bearings
For example, a bearing labeled would have a bore diameter (d) of 20 mm, specific outer diameter, and a defined load rating.