0.5mm-25.4mm 304 stainless steel balls

Product Overview

This range of stainless steel balls runs from 0.5 mm to 25.4 mm — the small end for instrument pivots and miniature check valves, the top end at exactly one inch, so buyers working to imperial drawings order without converting. Every ball is a solid, fully polished sphere in grade G200, with hardness held between HRC 20 and 38, which keeps the surface hard enough to resist wear without making it brittle. 304 is the workhorse of the austenitic family: it stands up to water, most food and household chemicals and repeated washdown, which is why it turns up in valve seats, pump internals, sprayer mechanisms and light bearing positions. Buyers consolidating a bill of materials normally take several diameters of precision steel balls in one order rather than splitting it between suppliers, and both the commercial and the industrial packing formats can ship together. Where the duty calls for higher hardness or a marine-grade alloy, the same sizes are available in 440C and in 316.

Specifications

Commercial packing uses a plastic bag, colour box, carton and pallet, while industrial packing uses either a plastic bag with an iron drum and pallet or a plastic bag with a woven bag and wooden carton. Packing can also be arranged to the customer's own requirements, and the sales unit is a single product.

Size Range and Typical Uses

• 0.5 mm to 1.5 mm. Instrument pivots, miniature check valves, aerosol and perfume pump seats, and prototype builds where the ball is a tiny sealing element and every hundredth of a millimetre counts.
• 2 mm to 5 mm. Small pumps, condiment and spice pump internals, garden sprayer triggers and light-duty positions in compact mechanisms.
• 6 mm to 12 mm. The diameter most often specified for stainless steel bearing balls in light mechanisms, plus valve trim, drawer slides and other hardware contacts that need a smooth rolling surface.
• 12 mm to 25.4 mm. The heavy end of the range; 25.4 mm is exactly one inch, so an imperial drawing converts with no rounding and no second supplier.
• Solid, not hollow. These are solid steel balls throughout, so weight per piece, balance and shape stay predictable under pressure and vibration — which matters when the ball is doing sealing work.
• How to specify. Quote the diameter in millimetres and, where your drawing is imperial, the inch equivalent as well. A ball is measured across its diameter with a micrometer, not judged from a photograph.
• Valve seats. If the ball is going into a seat, send the bore as well as the diameter. A stainless steel ball valve manufacturer normally specifies the pair together, because the two measurements decide whether the ball seals or leaks past.
• Mixing sizes. Several diameters can ship on one purchase order and one packing list, which keeps a bill of materials together instead of spreading it across suppliers.

Design Efficiency and Structural Integrity

Consistent diameter and consistent material are what make a ball easy to design around. Every lot is produced to the same G200 grade, so a part validated on the first delivery still fits the same bore on the tenth. Roundness and a fully polished surface spread load evenly across a seat or race rather than concentrating it on one high spot, which is what keeps a low-load assembly running quietly and cool. Because the balls interchange with standard components, they drop into existing housings without re-machining, and incoming inspection stops rejecting parts that were never out of specification in the first place. For lines that run to a schedule rather than to a stock level there is a second benefit: several diameters can be called off in one shipment, so a small buffer replaces a shelf full of separate part numbers. That is the practical value of buying precision steel balls from a single source — the tolerance, the polish and the packing all come off the same process, and a change in any of them is something you hear about before it reaches your line.

Operational Reliability and User-Centered Performance

• Wear resistance under load. The polished surface and the HRC 20–38 core slow surface loss in sliding and rolling contact, so a component holds its fit for longer between services.
• Solid construction. These are solid steel balls rather than shells, so weight and balance stay stable under pressure and the ball will not deform into the seat under a sustained load.
• Hardness balanced for corrosion. 304 is not a through-hardened bearing steel, and the band is set so the ball keeps its corrosion resistance in wet or washed environments instead of trading it away for hardness.
• Low maintenance demand. A ball that does not pit or roughen keeps its seat clean, which means fewer strip-downs and fewer rejects at final test.
• Paperwork that clears incoming inspection. ISO and RoHS documentation travels with the shipment, so a regulated buyer can file the material without chasing certificates weeks later.
• Repeatable lot to lot. Same grade, same heat treatment, same finishing route on every run, which is what keeps a specification written once valid on the next order.
• Support after the order. Questions about fit, grade or batch behaviour go to the team that produced the balls rather than to a reseller reading from a catalogue.

Material Grades: 304, 316 and 316L

304 is an austenitic stainless steel. It is corrosion resistant, only slightly magnetic in the annealed condition, and annealing can render it non-magnetic — worth knowing before a magnetic sensor or a reed switch is designed around it. The general applications for the grade are valves and related applications, food, aerosols, household sprays, perfumes and medical devices, largely because it shrugs off water, washing and most everyday chemicals. Where chlorides, marine air or sulphuric acid are present, 316 stainless steel balls are the better answer: 316 is non-magnetic and holds its corrosion resistance even in marine atmospheres and sulphuric acid, and it is also used with phosphoric and acetic acid in chemical, papermaking and textile plants. 316L carries a lower carbon content than conventional 316 and gives better corrosion resistance again; it is the grade normally specified for jewellery and implant work. This range of precision steel balls is stocked and quoted in 304, with 316 available to order. Tell us the medium and the working temperature and we will confirm which grade the duty actually needs rather than leaving you to guess.

From Wire to Finished Ball

1. Cold heading. Wire is cut to length and pressed between dies into a rough sphere, so the whole mass of the ball is formed in one stroke rather than built up in layers.
2. Flashing. The ring of surplus material left around the equator is removed, which is the point where the ball first becomes genuinely round.
3. Heat treatment. Controlled treatment brings the ball into the HRC 20–38 band for this grade, balancing corrosion resistance against surface durability.
4. Fine polishing. At least five hours of finishing produces the full, bright polish the range is supplied with; this stage decides both how the ball looks and how it behaves under friction.
5. Inspection. Photoelectric instruments scan the balls as they pass, and diameter and hardness are checked against the grade before a lot is released.
6. Packing. Stainless steel balls are counted, bagged and boxed for commercial orders, or drummed and palletised for industrial orders, then labelled for export.

Valve and Fluid-Handling Components

• Stainless steel ball valve bodies. The sphere is the sealing element; it rotates against the seat to open and close the flow path, so roundness and surface finish decide how cleanly it shuts off.
• Ball check valves. The ball lifts off its seat under forward flow and drops back to block reverse flow — here weight and roundness matter more than hardness, and a polished surface helps it reseat quickly.
• Seam and dispensing valves. In aerosol, perfume and pump packs, a small ball works as the check element in the dispensing head, opening on the pressure stroke and closing as the chamber refills.
• Medical application valves. Corrosion resistance plus a cleanable, fully polished surface suit reusable and single-use valve bodies; tell us what your quality team needs documented before the order is placed.
• Why the polish matters here. A smooth surface leaves residue and bacteria fewer places to cling to, and it lets cleaning fluid drain away instead of pooling in a scratch.
• Matching the ball to the seat. Measure the seat bore rather than the old ball alone. A ball slightly under size will leak past the seat; one slightly over size will not seat at all.
• Supply continuity. Because every diameter comes off the same production line, a valve programme using three sizes can be held on one qualified material source — the point most stainless steel ball valve manufacturer teams raise first when they change supplier.

Bearings, Pumps and Sprayer Mechanisms

Not every position needs a hardened bearing steel. In small pumps, circulating-ball systems, aerosol pumps, garden and household sprayers, pre-compressed spice pumps and agricultural backpack sprayers, the ball is usually a check element or a light rolling contact rather than a loaded race component — and there, corrosion resistance and a clean surface matter more than through-hardness. The same stainless steel bearing balls appear across the food, chemical, naval, aerospace and military industries, most often in auxiliary mechanisms rather than primary drive trains. Each mechanism asks something slightly different of the fit: a sprayer trigger ball is chosen for seal quality, a circulating ball for free movement through a narrow channel, and a pump check ball for how quickly it settles back onto its seat. Where the duty is genuinely load-bearing, our chromium and 440C lines take over; this 304 range is the right answer when the medium is wet, the load is light and the part has to stay clean through repeated washdown.

OEM and Custom Requirements

• Your brand on the box. Balls ship under Condar or under your own label; carton, bag and label are all part of what we quote.
• Made to a drawing. Send a technical drawing or a physical sample and we work to the size, hardness and surface finish it specifies. A stainless steel ball valve manufacturer will normally send the seat bore alongside the ball diameter, which lets us check the fit before production starts.
• Grade changes. G200 is the standard for this range. If your drawing calls for a tighter grade, put it on the enquiry so it is quoted on the right basis rather than assumed.
• Material changes. Where the duty needs more corrosion resistance than 304 can hold, the same sizes run in 316 stainless steel balls.
• Finish. A full polish is standard. If your part needs a specific surface condition, describe it instead of assuming it is covered.
• Trial before production. A small lot can be approved before a run begins — ask your sales contact about sample availability and the quantity that makes sense for your trial.
• Straight answers up front. Not every request is a routine line item. If something sits outside what we can hold to, you will hear it before the order is placed, not after.

Packing, Shipping and Ordering

Product Video

The clip opens on the polish itself — solid spheres with a mirror-bright surface, which is the finish you can expect on delivery. From there it moves through the checks a lot goes through, including the photoelectric inspection stations that scan the balls as they pass, and closes on packing: iron drums sealed onto a pallet for industrial quantities, and cartons stacked and strapped on a pallet for commercial orders. Watch the size spread across the frame; it is the quickest way to judge which diameter suits the part you have in mind, because the small and large ends of this range look very different in the hand. If you need a closer look at one diameter, or at the packing you would actually receive, ask your sales contact for a photo of that size before you order.

Scale & Supply Capability

Yuncheng Kangda Steelball Co., Ltd., the factory behind the Condar brand, has been producing precision balls in Shandong, China since 2014 with a team of 80. Two factories handle production, while a 2,000 m² warehouse inside the Liaocheng logistics park keeps common sizes in stock so ordered sizes can leave quickly. More than a hundred sets of production and inspection equipment work to GB/T308.1-2013, backed by ISO documentation and RoHS/REACH material statements. Customised or made-to-order items can be quoted case by case.

FAQ