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Recommended Fits for Shaft

NGX Series - Shaft and Geometrical Tolerance Recommendations

General Information

The accuracy of the fits and the geometrically correct design of all connecting parts have a direct effect on the running accuracy and the dynamic properties of the bearing and the table.

Please observe the construction notes in the general catalogue chapter.

The actual dimension of the bearing bore can be found in the inspection report included with each bearing.

Fit Requirements

On both rotating and stationary shafts, the bearing inner ring must be supported across its entire surface, and the shaft should be designed with a fit according to h5.

In this way, the bore tolerance of the bearing results in a transition fit with a slight tendency towards clearance.

For special requirements, the clearance fit must be further restricted within the specified tolerance grade:

  • If the highest running accuracy is required, a clearance fit of 0 should be aimed for. Otherwise, the clearance fit may add itself to the radial runout of the bearing.
  • At higher speeds and longer duty cycles, the interference fit must not exceed 0.005 mm.

Shaft Fit Recommendation Diagram

AXRY-NGX shaft fit recommendation diagram (J / H / T1 / T2 / T3 / ⌀di callouts)
AXRY-NGX shaft fit recommendation: journal dimensions and geometrical tolerance callouts (⌀di / J / H / T1 roundness / T2 parallelism / T3 perpendicularity / R max / Ra 0.8). Source: myonic official shaft fit recommendation.
(Click the image to enlarge)

Shaft Tolerance Specifications

Symbol Legend
  • ødi: Nominal bore diameter of the shaft (mm)
  • h5: Shaft tolerance band, recommended tolerance for rotating shafts (upper deviation 0 / lower deviation, mm)
  • J: Pitch circle diameter (mm)
  • H: Minimum support height (mm)3)
  • T1: Roundness tolerance (µm)
  • T2: Parallelism tolerance (shoulder face relative to journal, µm)
  • T3: Perpendicularity tolerance (shoulder face relative to journal axis, µm)
  • Rmax: Maximum corner radius (mm)
Bearing Model ødi
[mm]		 h5
[mm]		 J
[mm]		 H
[mm]		 T1
[µm]		 T2
[µm]		 T3
[µm]		 Rmax
[mm]
AXRY 180-NGX 180 0 / -0.018 194 43 5 2.5 5 0.1
AXRY 200-NGX 200 0 / -0.020 215 45 7 3.5 7 0.1
AXRY 260-NGX 260 0 / -0.023 280 55 8 4 8 0.3
AXRY 325-NGX 325 0 / -0.025 342 60 9 4.5 9 0.3
AXRY 395-NGX 395 0 / -0.025 415 65 9 4.5 9 0.3
AXRY 460-NGX 460 0 / -0.027 482 70 10 5 10 0.3
AXRY 580-NGX 580 0 / -0.032 610 90 11 5.5 11 1
AXRY 650-NGX 650 0 / -0.036 680 122 13 6.5 13 1

1) The envelope condition E applies here.

2) Note the countersinking of the threads.

3) The support ring must cover the entire bearing height (minimum support height).

ESC