| Property | Value |
|---|---|
| Product | 440C G10 stainless steel ball |
| Material | 440C stainless steel |
| Precision grade | G10 |
| Diameter | 5.556 mm (7/32 inch) |
| Hardness | HRC 58-62 |
| Surface finish | Lapped |
| Certification | ISO, RoHS |
| Brand | Condar |
| Origin | Shandong, China |
| Sales unit | Multiples of 1,000 pieces |
| Batch carton size | 15 x 10 x 5 cm |
| Batch carton weight | 0.720 kg |
These balls go into bearing accessories and small mechanical parts, and they are a stock item for repair shops and hardware accessory suppliers that need a replacement on the shelf. Typical positions are pivots, detent and latch fittings, spring plungers and adjustment screws, where the sphere sets the feel of the movement rather than carrying a heavy load. Because these are bearing balls rather than decorative spheres, they are made to hold their diameter through repeated cycles of use.
Condar Kangda is a factory-direct steel ball supplier serving bearing, testing and industrial component buyers. Our range covers hardened chrome, 440C stainless and 304/316 stainless steel balls in diameters from 1.5 mm to 120 mm, in precision grades such as G10, G100 and G200, plus miniature ball bearings. We supply in bulk and support hardness and roundness testing on request. For non-standard diameters, grades or materials, send your drawing and we will quote OEM and custom production. Share your annual volume and we will confirm delivery.
G10 is a precision grade rather than a material code: it describes how tightly the diameter and roundness of each ball are held, and it is a tighter band than the commercial grades. That is what keeps play consistent in a bearing, a pivot or a small adjuster. If your drawing names a different band on the same diameter, as a G10 440C steel ball supplier we can hold that too.
Yes — 7/32 inch converts to exactly 5.556 mm, so an imperial drawing and a metric one describe the same part. We supply it under both designations, which makes ordering precision steel balls against an older imperial print straightforward. Both call-outs refer to one production size, so you can order on whichever one your drawing uses.
440C is a hardened stainless grade, and stainless steel balls in this family handle damp air, lubricant film and constant handling well. It is not the grade for permanent immersion, salt spray or aggressive chemical wash-down — 316 stainless is the better choice there, and we can produce it in the same diameter. Tell us the exposure the part will see and we will confirm which grade to specify.
Yes, provided the original is the same 7/32 inch size and the grade is matched; send us the old part or a measurement and we will confirm the nearest standard build. Where a race holds several balls, replace the whole set rather than one ball, because a single new ball carries load unevenly against worn neighbours. Ordering fresh bearing balls by diameter and grade is usually quicker than replacing the whole assembly.
Lapping is a fine abrasive process: the ball is worked against a fine medium that removes shaping marks and brings the sphere to its final roundness, which keeps friction and running noise low. Stainless steel balls finished this way have a fine, even surface rather than a mirror shine, and that is normal for a lapped precision ball. A high polish would photograph better but would not change how the ball runs.
Keep them in the original carton or another sealed container in a dry area rather than tipping them into an open bin. Store them away from grinding dust and swarf, because even a hard stainless ball can be scratched, and those marks show up later as noise or rough running. Wear clean gloves when you load a precision assembly.
