
Shore A vs Shore D: Why 'Shore 70' Is Not a Spec
Shore A vs Shore D hardness are two instruments, not two precisions: why 'Shore 70' is not a spec, why no conversion exists, and how to write a callout that holds.
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Shore A vs Shore D hardness are two instruments, not two precisions: why 'Shore 70' is not a spec, why no conversion exists, and how to write a callout that holds.

Ra vs Rz measure different things — two parts can share an Ra and only one will seal. What each parameter sees, why no conversion factor works, and what ISO 21920 changed.

Cover width vs overall width decides panel count: a 1,000 mm sheet covers 840 mm. The profile table, the panel-count formula and where the 25% shortfall comes from.

What bearing numbers mean: 6205 decodes to a 25 mm bore, 52 mm OD and 15 mm width under ISO 15. Bore-code table, dimension series, suffixes and what to quote.

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How to communicate product dimensions to buyers: four methods — email spec, technical drawing, plain photo, annotated photo — compared on comprehension and error risk.

Plywood dimensions and grades confuse export buyers: nominal vs actual thickness, sheet sizes, face and back grades, glue class, and formaldehyde compliance, explained.

Export pallet dimensions set container fit and freight cost — the six ISO 6780 footprints, which pallet to load per market, and how many fit a 20ft or 40ft container.

Flange dimensions for export decide fit: the same OD can hide a different bolt circle. The seven numbers buyers ask for, and the mistakes that ship the wrong part.