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12516 HUDSON WAY, THORNTON, CO 80241

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Shaft Specs Tolerances

The shaft surface finish is of primary importance for efficient sealing and achieving adequate seal life. The shaft hardness should increase with increasing peripheral speed. A peripheral speed of 4 m/s, the hardness should be minimum 45 HRC and at 10 m/s 55 HRC. Recommended minimum hardness depth is 0.3 mm if shafts are not fully hardened.

Inadequate shaft finish or grooved, pitted surfaces generate higher friction, hence higher temperatures reducing seal life or overall seal-ability. Machining defects, scratches or existing groove marks on the shaft must be avoided. The shaft tolerance and run-out allowance must be in compliance to achieve proper sealing.

Even very small defects could be sufficient to increase the film thickness, eventually rupturing the meniscus and causing leakage. It is also important to avoid spiral grinding or groove marks. This could cause a pumping effect or a dry run condition resulting in leakage or failure.

 

Below are the DIN 3760 standards for shaft tolerance.

SHAFT TOLERANCEĀ INCH (in) SHAFT TOLERANCE INĀ METRIC (mm)
Shaft Diameter Shaft Tolerance Shaft Diameter Shaft Tolerance
Up to 4.000 +/-0.003 Over 0 to 3 0/-0.06
4.001 to 6.000 +/-0.004 Over 3.1 to 6 0/-0.075
6.001 to 10.000 +/-0.005 Over 6.1 to 10 0/-0.09
10.001+ +/-0.006 Over 10.1 to 18 0/-0.110
Over 18.1 to 30 0/-0.130
Over 30.1 to 50 0/-0.160
Over 50.1 to 80 0/-0.190
Over 80.1 to 120 0/-0.220
Over 120.1 to 180 0/-0.250
Over 180.1 to 250 0/-0.290
Over 250.1 to 315 0/-0.320
Over 315.1 to 400 0/-0.360
Over 400.1 to 500 0/-0.400
  • General Information
    • General Rotary Seal Information
    • Shaft Seal Installation
    • Shaft Seal Type Interchange Table
    • Standard Shaft Seal Types
  • Tolerances Information
    • Bore Specs Tolerences
    • Shaft Specs Tolerances
    • Press-Fit Specs Tolerances
  • Materials Information
    • General Materials Information
    • Material Fluid Compatibility
    • Case and Spring Materials
  • Shaft Information
    • Shaft Eccentricity
    • Rotary Seal Permissible Shaft Speed
    • Permissible Shaft Pressure

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  • 12516 Hudson Way, Thornton, CO 80241
       720.436.8322
       info@ddsseals.com

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