ISO 6549:2026

Road vehicles — Procedure for H- and R-point determination ISO 6549:2026

Publication date:   Sep 15, 2026

Scope

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:

the distance, vertically measured, between the operator heel point and the seating reference point is less than 550 mm,
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.