According to the official DIN 509 Standard Tables available via Scribd , Form E grooves feature fixed mathematical ratios to maintain proper clearance and run-out angles. Below is the specific engineering data tailored to the profile: Parameter Type Engineering Designation Exact Dimension Groove Form Type E (Single-Surface Relief) Corner Radius Groove Depth Minimum Width Run-out Length Recommended Shaft Range Typically over 3. Why the "Exclusive" Status Matters in CAD/CAM Design
The larger, defined radius is easier for QA/QC inspectors to measure on optical comparators compared to smaller radii. din 509e06x02 exclusive
When a mating component—such as a bearing, washer, or gear—is pressed onto a shaft, it must sit entirely flush against the locating shoulder. If a radius or burr remains at the corner, the mating part will stall prematurely. The E0.6x0.2 groove completely clears out that corner space, guaranteeing perfect axial seating. According to the official DIN 509 Standard Tables
) : The radius of the relief groove curvature is exactly . 0.2 (Depth When a mating component—such as a bearing, washer,
Sharp geometric transitions act as structural stress risers under torsional or bending loads. By introducing a precisely managed
This is the metric measurement of the cut. In the notation E0.6x0.2 , the first number— 0.6 —refers to the radius (r) of the undercut's curvature measured in millimeters. This is the curved arc at the bottom of the groove. A radius of 0.6 mm is a standard industrial value used for medium-sized shafts and bores. According to the DIN 509 specifications for a Form E undercut, a radius of 0.6 mm is typically recommended for shaft diameters ranging from 3 mm up to 80 mm. This radius is the "exclusive" factor here; if a shaft is claimed to have a DIN 509 relief, the radius must be exactly 0.6 mm (within tolerance) to guarantee fitment.