Testing & tolerances

Practical guides on aluminum extrusion, battery enclosures and EV manufacturing — written for engineers and sourcing teams.

Testing & tolerances11 min read Oct 12, 2026

Battery Box Tolerances: What to Put on the Drawing

A 2 mm wall arrives at ±0.23 mm unless the drawing names a class. Why the band is wider than it looks, and where it breaks a gasket seal.

Overview7 min read Sep 23, 2026

IP65 and IP67 are two different tests, and a 'leak tested' line on an invoice proves nothing. What to write into the PO instead.

Testing & tolerances11 min read Sep 13, 2026

Four ways to leak test a battery box, from a shop-floor pressure gauge to a helium chamber. The cheapest one misses the leak that matters.

Testing & tolerances11 min read Sep 02, 2026

IP54, IP65 and IP67 are three different tests, not three grades of one thing. What each one puts the box through, and what AIS 156 asks for.

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