ISO 6549:2026

Current Revision
Road vehicles - Procedure for H- and R-point determination

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ISO 6549:2026

Road vehicles - Procedure for H- and R-point determination

PUBLISH DATE 2026
ISO 6549:2026

This document defines a three-dimensional H-point machine for use in the determination of the actual H-point and torso angle of a seat, for the purpose of comparing these measurements to the manufacturer's seating reference point and design torso angle.

The three-dimensional H-point machine is intended to be used as a checking device for one designated seat position at a time and is not a device which measures or indicates an occupant's capabilities or comfort.

This document is applicable to any motor vehicle where:

  1. the distance, vertically measured, between the operator heel point and the seating reference point is less than 550 mm,
  2. the torso angle is greater than 5° rearward of vertical or where the attitude of the thigh centreline as indicated by the thigh bar is greater than 5° above the horizontal.
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