Products & Technology – technical fundamentals

Strength classes, ISO tolerances, custom vs. standard screws,
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Knowledge · Products & Technology

Technical Fundamentals for Design Engineers and Buyers

Strength classes, tolerances, materials and surfaces — written by technical
buyers for technical buyers. Compact, without marketing fluff.

Featured · Materials & Surfaces

Property classes 4.6 to 12.9 — what the numbers really mean


Yield strength, tensile strength, heat treatment — the logic behind the standard explained in 8 minutes. With practical tips on when each class pays off.

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CNC turning, CNC milling, closed-die (drop) forging — when to use which?

Materials & Surfaces

Steel, stainless steel, non-ferrous metal, coatings.

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ISO 9001, DIN EN, material testing.

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