GDT

GD&T Reference Guide — Geometric Dimensioning & Tolerancing (ASME Y14.5)

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Geometric Dimensioning & Tolerancing (GD&T) GD&T is the language of engineering drawings. If you’re reading prints or designing parts, you need to understand these symbols. This reference covers the 14 geometric characteristic symbols defined in ASME Y14.5, with explanations and tolerance zone definitions. GD&T replaces ambiguous plus/minus tolerancing with precise geometric controls. Instead of saying … Read more

Surface Finish Guide for Machined Parts — Ra Values & Specifications

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Why Surface Finish Matters Surface finish (or surface roughness) describes the texture of a machined surface. It affects sealing, wear, fatigue life, coating adhesion, and appearance. If you’re designing parts that mate, seal, or slide against each other, you need to specify surface finish on your drawing. Common Surface Finish Values Ra (µin) Ra (µm) … Read more