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Specialized company in manufacturing steel ball & tapered roller for precise ball bearings

Technical Data

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Raw Material Terminology Specification

Raw Material

For the material of steel ball for ball bearings, STB2(JIS G 4805, SUJ2 and AISI E 52100) of KS D 3525 is used, and separate management is implemented if there is a special requirement from customers.

Type Symbol Chemical Component Table (%)
C Mn Si Cr S P
STB 1 0.95~1.10 below 0.50 0.15~0.35 0.90~1.20 below 0.025 below 0.025
STB 2 0.95~1.10 below 0.50 0.15~0.35 1.30~1.60 below 0.025 below 0.025
STB 3 0.95~1.10 0.95~1.15 0.40~0.70 0.90~1.20 below 0.025 below 0.025
STB 4 0.95~1.10 below 0.50 0.15~0.35 1.30~1.60 below 0.025 below 0.025
STB 5 0.95~1.10 0.90~1.15 0.90~1.15 0.90~1.20 below 0.025 below 0.025
※ Our company is implementing quality assurance suitable to the standards (KS, JIS, ASTM, SEP1520, etc.) of each country around the world to secure high quality raw materials.