ISO 9248:1992

Overview

ISO 9248:1992 specifies the units, symbols and tolerances to be used when reporting dimensions, performance and capacities of earth‑moving machinery (as defined in ISO 6165). The standard defines the primary and derived SI units to be applied, gives typical measurement tolerances, and sets basic rules for rounding results. It does not prescribe measurement methods or the instrumentation to be used.

Key topics

• Scope and references
  • Applies to general machine dimensions, performance and capacities of earth‑moving machinery (see ISO 6165).
  • Uses SI units and recommendations as referenced in ISO 1000.
• Units and symbols
  • Prescribes primary (SI base) and derived units for quantities such as length, mass, time, temperature, angle, force, pressure, power, velocity, acceleration, volume and flow.
• Tolerances (measurement accuracy)
  • Provides typical tolerances to be applied when reporting results. Examples from the standard include:
    • Linear dimensions: ±0.5% (metre)
    • Time (second): ±1%
    • Temperature: <200 °C → ±1 °C; >200 °C → ±2 °C
    • Angle (radian): ±0.02 rad
    • Frequency (Hz): ±1%
    • Area: ±2%
    • Volume: ±3%
    • Force (N): ±1%
    • Pressure (Pa): ±2%
    • Power (W), speed, acceleration, torque, energy, volumetric flow: typically ±2%
    • Sound pressure level: ±1 dB
  • Notes that these tolerances also apply to equivalent units used to express the same quantity; special cases or tighter tolerances should be specified in particular international standards.
• Rounding rules
  • Results must be rounded by adding or subtracting numeric values compatible with the prescribed tolerances.

Applications

ISO 9248 is practical for:

• Manufacturers and OEMs preparing technical specifications, performance data sheets and operator manuals.
• Test laboratories and quality departments reporting measured values for acceptance, warranty and verification.
• Procurement and contract writers who need consistent units and acceptable measurement tolerances in specifications.
• Standards developers and regulatory authorities harmonizing reporting of machine capabilities and capacities.

Who uses it

• Earth‑moving equipment manufacturers
• Test houses and conformity assessment bodies
• Fleet operators and contractors
• Technical writers and specification engineers
• Standards committees referencing ISO 6165-based definitions

Related standards

• ISO 6165 - Earth‑moving machinery - Main dimensions - Vocabulary (machine type definitions referenced)
• ISO 1000 - SI units and recommendations for use of their multiples (unit basis referenced)

Keywords: ISO 9248, earth‑moving machinery, measurement units, measurement tolerances, SI units, machine dimensions, performance and capacities, measurement accuracy.