TR 4271 : 1

0 Introduction
1 Scope
2 Normative references
3 Symbols
4 Generals
  4.1 Rubber families concerned
  4.2 Permissible pressures
5 O-ring housings
  5.1 Radial sealing
      5.1.1 Rod housings
      5.1.2 Bore housings
  5.2 Axial sealing
      5.2.1 Face seals for internal pressure
            source
      5.2.2 Face seals for external pressure
            source
6 Factors influencing the quality of sealing
  6.1 Surface roughness
  6.2 Corner and edge radii
  6.3 Lead-in chamfers
  6.4 Groove run-out tolerance
  6.5 Housing diameter tolerances
  6.6 Housing width and depth
      6.6.1 Housing width (b)
      6.6.2 Housing depth (h or t)
  6.7 Stretch and compression o-ring
      6.7.1 Radial sealing
      6.7.2 Axial sealing
7 Method of calculating housing dimensions
  7.1 Radial application - Piston housing
  7.2 Radial application - Rod housing
  7.3 Axial application - Internal pressure
  7.4 Axial application - External pressure
8 Design criteria
  8.1 O-ring stretch or compression
      8.1.1 Rod housing
      8.1.2 Bore housing
      8.1.3 Axial housing
  8.2 Cross-section reduction
  8.3 O-ring squeeze (e)
  8.4 O-ring swell
  8.5 Housing widths

Gives the design criteria recommended for the housing definition for o-rings as defined in ISO 3601-1, and a calculation method to formulate dimensions of the housing for which the near environment influences parameters in consequence of the definition (seal stretch, squeeze, reduced seal cross-section, swell).