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The first thing most buyers ask about is consistency across batches, and we've got that covered with multiple testing protocols at different production stages rather than just a final check.
Hardness on these runs HRC 60-66 for the chrome steel versions, sizes from 0.8mm to 80mm with grade G10 up to G1000 precision—basically you can hold ±0.001mm if you need it, and we do random retesting from every batch at no extra cost.
What matters for tools and industrial components is surface finish uniformity, and we run a full inspection on surfce defects and roundness before anything ships; we've seen too many batches arrive with inconsistent polish from other suppliers, so we don't cut that corner.
Certifcates come with every standdard order, COA with chemcial composition (C, Si, Mn, Cr, Mo, P, S) and hardness values, and our company can provide a full test report if you need it for your own quality audit (usually within 2-3 working days extra).
Custom sizes or tighter tolerances take about 20 days or so for tooling setup, but MOQ on those is higher—roughly 5000 units depending on diameter, and we'll confirm lead time before you commit since our production schedule shifts occasionally.
Logistics is mostly FOB from our warehose, packed in sealed drums or bags per your request, and our company offer a retest policy where you can send back samples from the batch for verification if anything looks off, no questions asked within 14 days of receipt.
MOQ depends on size and grade — for standard 2.0mm G100 balls, we start at 10,000 pieces. Smaller or custom sizes may have a higher MOQ.
Standard lead time is 2-3 weeks for custom specs like that. If we have the raw material in stock, we can push it to 10-12 working days.
Yes, every batch comes with a mill certificate showing C, Si, Mn, Cr, Mo, P, and S content — plus hardness and grade results. ISO 9001 and IATF 16949 docs are available on request.
Absolutely — we can customize material, size, and precision. For 25.4mm stainless steel balls at G10 grade, the tolerance stays ±0.001mm. Just confirm the exact hardness range you need.
We pack them in rust-proof oil, sealed in poly bags and then fiber drums or cartons. For carbon steel, we recommend dry indoor storage with humidity under 60%. Anti-rust paper is optional on request.
