Engineered for extreme precision, high hardness, and superior rolling fatigue resistance, AISI 52100 chrome steel balls (also widely known as 100Cr6, SUJ2, or GCr15 bearing steel balls) serve as an industry-standard solution for high-load mechanical assemblies. Produced from high-carbon chromium alloy steel, these through-hardened steel balls deliver exceptional structural integrity through a uniform martensitic cross-section, ensuring unmatched durability and wear resistance compared to standard low-carbon alternatives.
Limited (Requires rust-preventive oil or protective environment; non-stainless)
Surface Finish
Polished, lapped, oiled, dry, or custom finishing upon request
Chemical Composition Reference (AISI 52100 / 100Cr6)
Carbon (C): 0.95 – 1.05%
Chromium (Cr): 1.40 – 1.65%
Manganese (Mn): 0.25 – 0.45%
Silicon (Si): 0.15 – 0.35%
Phosphorus (P) max: 0.025%
Sulfur (S) max: 0.025%
Manufacturing & Process Control
The production of high-performance bearing steel balls requires rigorous quality control across every metallurgical phase:
Controlled Heat Treatment: Unlike case-hardened alternatives, these balls undergo precise through-hardening, developing a consistent martensitic structure that prevents core softening under prolonged stress.
Precision Grinding & Lapping: Advanced manufacturing techniques ensure strict sphericity, tight dimensional tolerances, and ultra-smooth surface finishes spanning from high-precision G10 up to industrial-grade G1000.
Global Material Equivalents: Fully compliant with international engineering standards including 1.3505 / 100Cr6 (Germany/EN), GCr15 (China), SUJ2 (Japan), and 100C6 (France).
Target Application Industries
Precision Bearings: Excellent load-bearing capacity and rolling contact fatigue performance for deep groove, tapered, and cylindrical bearings.
Automotive Components: Reliable durability in steering linkages, transmission systems, and high-stress couplings.
Linear Motion Systems: Smooth motion, dimensional stability, and repeatability for precision rails and slides.
Pumps & Valves: High hardness ensures reliable sealing performance in check valves and fluid control setups.
Industrial Hardware & Conveyors: Durable rolling contact solutions for castors, rollers, locks, sliders, and mechanical assemblies.
Expert & Selection Recommendations
Operational Environment Check: Because these are high-carbon chrome bearing balls rather than stainless steel, they require protection against moisture and humidity. Always use them in dry, lubricated, or sealed mechanical assemblies to prevent surface oxidation. For wet, marine, or chemical environments, opt for stainless steel, ceramic, or polymer alternatives.
Matching Precision Grades: Select tighter tolerance grades (such as G10 to G28) for high-speed precision spindles and aerospace-grade instruments. For cost-sensitive hardware, drawer slides, or general industrial conveyors, standard commercial grades (G100 to G500) provide an economical balance of performance and value.
Lubrication & Load Management: Ensure proper lubrication regimes are maintained during operation to minimize friction and extend the service life of high-contact stress applications.
