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Precision Ball Metallurgy, ISO 3290 Standards & Application Guides

In-depth technical resources authored by DSP's metallurgy and quality assurance engineers for bearing, valve, automotive, and industrial buyers.

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All Engineering Guides (3)Quality & Metrology Corrosion & Chemical Engineering Metallurgy & Materials

AISI 304, 316L, 420 and 440C stainless steel balls for valves and bearings

★ Featured Engineering GuideCorrosion & Chemical Engineering2 min read · 272 words

Stainless Steel Balls Comparison: AISI 304 vs 316L vs 420 vs 440C Selection Guide

Compare austenitic (AISI 304, 316L) and martensitic (AISI 420, 440C) stainless steel balls across corrosion resistance, hardness, magnetic properties, and valve/bearing applications.

By DSP Metallurgy & Quality Engineering Team · Updated 17 Oct 2026

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ISO 3290 precision ball sphericity and micrometer tolerance inspection at DSP lab

Quality & Metrology2 min read

ISO 3290 & DIN 5401 Precision Ball Grades Explained: Sphericity, Ra & Lot Variation

How to read ISO 3290, DIN 5401, and AFBMA precision ball grade tables — understanding Vdws (ball diameter variation), tdw (sphericity), Ra surface roughness, and lot sorting.

17 Oct 2026Read Article →

AISI 52100 high-chrome steel balls manufactured to ISO 3290 precision grades

Metallurgy & Materials2 min read

AISI 52100 Chrome Steel Balls: Complete Engineering, Hardness & ISO 3290 Grade Guide

An engineering guide to AISI 52100 (100Cr6 / EN31) high-chrome bearing steel balls, covering chemical composition, 60–66 HRC through-hardening, ISO 3290 grades (G3 to G100), and industrial applications.

17 Oct 2026Read Article →