ISO 12777-2:2000 PDF

Overview

ISO 12777-2:2000 defines laboratory test methods for measuring the axial resistance of pallet nails and staples - specifically the withdrawal resistance (nail/staple pulled out of the material) and head pull-through resistance (nail head pulling through a sheet or component). It covers tests for wood-to-wood joints and for joints with wood-based and non-wood-based materials, and applies to nails up to 7 mm diameter and to common staple types.

Key topics and technical requirements

• Test scope: Withdrawal and head pull‑through resistance for nails (plain, threaded, fluted, helical, etc.) and staples; applicable to wood, wood-based panels and some plastics.
• Specimen preparation:
  • Minimum sample size guidance (16 per variable suggested for statistical treatment).
  • Timber selection and conditioning per ISO 8970; record moisture content and density (ISO 3130, ISO 3131).
  • Assembly delays: do not test wood specimens for at least 16 hours after nailing; delayed testing can significantly change strength.
  • Environmental controls: specimens should not be in uncontrolled conditions >2 h before test (up to 24 h if wrapped).
• Geometry and penetration:
  • Nail penetration typically specified as multiples of shank diameter d (e.g., 8d–10d perpendicular to grain; 8d–16d parallel to grain).
  • Minimum specimen dimensions defined (e.g., length at least penetration + 5d).
  • Pull‑through specimen thickness: ≥5d and not less than 12 mm (sheet materials: production thickness).
• Test procedure and instrumentation:
  • Load application rate: nominally 25 mm/min ± 5 mm/min for withdrawal and pull‑through tests.
  • Record load–displacement (or load–time) curves and exact extraction/pull rates.
  • For pull‑through, record head geometry (diameter, countersink angle) and the minimum embedment (≥5 mm).
• Reporting: Detailed reporting requirements including fastener bending strength (per ISO 12777‑1), exact shank/profile, penetration depth, material properties (MoR, MFR, MVR for plastics), moisture content, elapsed time since assembly, and test accuracy.