Import Bearing Balls / Chrome Steel Balls — Buy in wholesale FOB from Supplier in China

Interest Group Steel Balls Co Ltd. manufactures bearing-grade chrome steel balls from AISI 52100 alloy, alternatively designated 100Cr6 under German standards and GCr15 under Chinese GB standards. The material conforms to ISO 3290 and AFBMA Grade 10-100 specifications, covering applications from precision instrument bearings through heavy-duty industrial machinery. The 100Cr6 designation indicates 1.0% carbon and 1.5% chromium nominal composition, a standard European bearing steel grade chemically equivalent to AISI 52100. Hardness reaches up to 60 HRC Rockwell, suitable for high-load rolling contact applications where fatigue resistance and wear properties are critical. The supplier is located in Tainan, Shandong Province, within China's eastern manufacturing belt with established steel ball production infrastructure.

The ISO 3290 standard governs dimensional tolerance, surface finish and sphericity across ball grades, while AFBMA (now ABMA) grades 10 through 100 define progressively looser tolerances for less demanding applications. Grade 10 represents precision bearing quality with tight dimensional control, whereas Grade 100 suits general mechanical applications where cost sensitivity outweighs ultimate precision. The dual-standard referencing suggests the supplier targets both OEM bearing manufacturers and aftermarket industrial users. Chrome steel balls in this specification typically undergo hot forging, rough grinding, heat treatment (austenitising at 840-860 degrees Celsius, oil quenching, and tempering at 160-180 degrees Celsius), followed by lapping and sorting to final grade. Surface integrity after lapping is critical, as residual grinding marks or subsurface damage act as fatigue nucleation sites under Hertzian contact stress.

Primary applications include deep groove ball bearings, angular contact bearings, linear motion guides and precision spindles in automotive, aerospace and general industrial manufacturing sectors. The balls reduce frictional torque in rotating assemblies and distribute contact loads across bearing raceways. Bulk packaging is offered for efficient import logistics, though specific pack sizes, inner packaging and protection against fretting corrosion during transit should be confirmed directly. The supplier's Tainan location in Shandong places it near Qingdao Port, a major export hub with established containerised shipping lanes. Response rate and average response hours both register zero, indicating buyers should establish direct contact channels early and consider independent verification of production capability before large commitments.

Interest Group Steel Balls Co Ltd. is based in Tainan, Shandong Province, 271000, China, with the supplier address listed as Shandong, Tainan, Shandong, China. The company holds a Harbour trust tier classification. Both response rate and average response hours show zero values, which may indicate a recently registered profile, limited platform engagement, or reliance on off-platform communication. No verified transaction history, factory certification details, or specific quality management system accreditation is present in the source data provided.

The listing emphasises chrome steel balls for precision and industrial applications, referencing ISO and SGS certifications in the source description, though specific certificate numbers, scope, or accreditation bodies are not detailed. Buyers should treat uncertified claims as requiring independent verification. The supplier's product focus on AISI 52100/100Cr6 material across AFBMA grades 10-100 suggests capability spanning from precision bearings to general industrial balls, but the actual production equipment, lapping capacity, and inspection instrumentation should be confirmed through direct factory assessment or third-party audit. The Tainan location in Shandong Province is within a region with historical steel ball manufacturing concentration, though this geographic association alone does not guarantee production standards.