Products
Four product lines.
One precision standard.
Bearing steel balls, ceramic balls, stainless steel balls, and bearing steel wire with annealing. Standard sizes ship directly; non-standard dimensions, materials and grades are quoted against your drawing.
01 — BEARING STEEL BALL
Bearing steel balls
GCr15 · 100Cr6 · SUJ2 · G10 / G16
Our main line. High-carbon chromium bearing steel GCr15, formed, spheroidise-annealed, hardened and tempered, rough-ground, fine-ground and superfinished, then graded ball by ball. Hardness sits at HRC 60–66; spherical error and surface roughness are held to the grade you order, so the balls can go straight onto an assembly line.
- MaterialGCr15 (100Cr6 / SUJ2); other bearing steels on request
- Size⌀0.5 – ⌀120 mm standard; larger sizes on request
- GradeG10 and G16 as standard, to GB/T 308 and ISO 3290; coarser grades on request; G5 is not available in steel
- HardnessHRC 60–66, tight spread within a batch
- SurfaceFine ground and superfinished, free of scale and dents, rust-prevented before packing
- PackingRust-preventive oil, cartons, sealed bags; line-side packaging on request
| Material | GCr15 / 100Cr6 / SUJ2 |
|---|---|
| Diameter | ⌀0.5 – ⌀120 mm |
| Grade | G10, G16 (standard); coarser grades on request; G5 not offered |
| Hardness | HRC 60–66 |
| Spherical error | Controlled to the grade standard |
| Surface roughness | Controlled to the grade standard |
| Typical use | Deep groove and angular contact bearings, motors, wheel hubs, transmission parts |
02 — CERAMIC BALL
Ceramic balls
Si₃N₄ · ZrO₂ · Al₂O₃
Ceramic balls are formed, sintered, ground and polished from silicon nitride, zirconia or alumina. At roughly 40% the density of bearing steel they are insulating, non-magnetic and resistant to heat and corrosion — suited to high speed, vacuum, aggressive media and wide temperature swings.
- MaterialSilicon nitride Si₃N₄, zirconia ZrO₂, alumina Al₂O₃
- Size⌀0.5 – ⌀100 mm; custom sizes on request
- GradeSilicon nitride down to G5; zirconia and alumina G10 / G16
- PropertiesLow density, insulating, non-magnetic, corrosion and heat resistant, low friction
- SurfaceMirror polished, Ra controlled to grade
- Typical useHigh-speed motor bearings, vacuum and chemical pumps, medical devices, semiconductor equipment
| Material | Si₃N₄ / ZrO₂ / Al₂O₃ |
|---|---|
| Density | ≈3.2 / 6.0 / 3.9 g/cm³ |
| Hardness | HV 1200–1700 (depending on material) |
| Diameter | ⌀0.5 – ⌀100 mm |
| Grade | Silicon nitride G5; zirconia and alumina G10 / G16 |
| Properties | Insulating, non-magnetic, corrosion resistant, low friction, heat resistant |
| Typical use | High-speed bearings, vacuum and chemical pumps, medical devices, semiconductor equipment |
03 — STAINLESS STEEL BALL
Stainless steel balls
304 · 316 / 316L · 420 · 440C
Two families: 304 and 316L for corrosion resistance in damp, food, medical and chemical environments; 420 and 440C martensitic grades that can be hardened for load and wear.
- Material304, 316, 316L, 420, 440C; other grades on request
- Size⌀0.5 – ⌀100 mm
- Hardness304/316 solution annealed; 420 approx. HRC 50–55; 440C approx. HRC 58–62
- Magnetism304/316 essentially non-magnetic (slight magnetism after cold work); 420/440C magnetic
- SurfacePolished or mirror finish, to your cosmetic requirement
- Typical useFood machinery, medical devices, chemical pumps and valves, instruments, hardware
| Material | 304 / 316 / 316L / 420 / 440C |
|---|---|
| Diameter | ⌀0.5 – ⌀100 mm |
| Hardness | 304, 316 solution annealed; 420 approx. HRC 50–55; 440C approx. HRC 58–62 |
| Corrosion | 304 for general environments; 316/316L for chloride and chemical media |
| Magnetism | 304/316 essentially non-magnetic; 420/440C magnetic |
| Surface | Polished / mirror |
| Typical use | Food machinery, medical devices, chemical pumps and valves, instruments, hardware |
04 — WIRE & ANNEALING
Bearing steel wire
and annealing
GCr15 wire rod · spheroidizing · soft annealing · stress relief
Beyond balls, we supply bearing steel wire and the annealing that goes with it. Wire and heat treatment in one plant means less transport and less coordination — and the hardness and structure that decide your yield downstream.
- WireGCr15 bearing steel wire rod; other grades on request
- Size⌀1.8 – ⌀25 mm coils, subject to stock and order
- AnnealingSpheroidizing, soft annealing and stress relief
- AtmosphereControlled atmosphere to limit decarburisation and oxidation
- HardnessProcessed to the target band, uniform within a lot
- DeliveryCoils, straight bars or cut lengths, with process and inspection records
| Grade | GCr15 (100Cr6) |
|---|---|
| Size | ⌀1.8 – ⌀25 mm coils |
| Annealing | Spheroidizing, soft annealing, stress relief |
| Atmosphere | Controlled, to limit oxidation and decarburisation |
| Hardness | To target band (spheroidized: typically HBW 180–207) |
| Microstructure | Spheroidised pearlite, degree to be agreed |
| Delivery | Coils / straight bars / cut lengths |
Size chart
Inch to metric.
Common inch sizes with the bearing models they normally fit. Carton counts (40 kg) for G10 and G16 are available on request.
| Inch | Diameter mm | Common bearing models | Approx. pcs / 500 g |
|---|---|---|---|
| 1″ | 25.40 | 314;221、1616、1319、220、8317 | 7.5 |
| 15/16 | 23.813 | 313;410、219、220、132、1318、1522、8226、8228 | 9 |
| 7/8 | 22.225 | 312;130、218、8410、8315、8316 | 11 |
| — | 21.431 | 1613;1317 | 12.5 |
| 13/16 | 20.638 | 311;408、1612、1316、1520 | 14 |
| — | 19.844 | 217;1222、8220、8222、8224 | 15.5 |
| 3/4 | 19.05 | 310;406、407、216、217、1611、1315、8144、1519、8313、8318、8140 | 17.5 |
| 23/32 | 18.256 | 122;1314、8408、8311 | 20 |
| 11/16 | 17.4625 | 309;122、124、214、215、8136、1610、1518、1220、8218 | 23 |
| 21/32 | 16.669 | 213;405、1313、1219、8407 | 26.5 |
| 5/8 | 15.876 | 212;121、1609、1312、1517、1218、8407、8310、8217、8134 | 30.5 |
| 19/32 | 15.081 | 308;118、119、120、1311、8126、8128、8130、8132 | 35.5 |
| 9/16 | 14.288 | 211;211、1608、1310、8309；大沟 1516、1217、8406 | 42 |
| 17/32 | 13.50 | 307;116、117、1607、1513、1515；小沟 1514、8215、8216、8308 | 50 |
| 1/2 | 12.70 | 210;403、209、210、1309、1215、1216；大沟 8212、8211、8213、8214、8120、8122 | 60 |
| 15/32 | 12.00 | 208;小沟 209、1606、1512、1214、8307 | 71 |
| 7/16 | 11.113 | 207;112、113、1308、1212、1213、8306、8210、8118 | 90 |
| 29/64 | 11.509 | 305 | 80 |
| 13/32 | 10.319 | 111;1605、1307、1211、1511、8505、8209 | 111 |
| 3/8 | 9.525 | 206;303、304、1306、1507、1508、1209、1509、1210、1510、8305、8207、8113、8114、8115、8116 | 142 |
| 11/32 | 8.731 | 109;110、303、1604、1305、1208、8112 | 184 |
| 5/16 | 7.938 | 205;301、302、204、705、107、108、1603、1206、1506、1207、8205、8206 | 245 |
| 9/32 | 7.144 | 203;106、1601、1602、1303、1304、1504、1205；大沟 8204、8108、8109、8110、300 | 335 |
| 17/64 | 6.747 | 203;小沟 | 400 |
| 1/4 | 6.35 | 104;105、1301、1302、1503、1504、8203 | 481 |
Piece counts are estimated from unit weight — weight at packing prevails. 「大沟 / 小沟」 refers to the groove type of the cage being fitted. Sizes not listed can be made to order across ⌀0.5–120 mm.
Estimator
Two numbers,
a ballpark.
Pick the material, enter diameter and quantity — piece weight, total weight and carton count come out instantly. Then send the same numbers with your enquiry.
Estimated from ball volume and material density — packing weight and process loss excluded. Densities: GCr15 7.81, 304 7.93, 316 8.00, 440C 7.75, Si₃N₄ 3.20, ZrO₂ 6.00, Al₂O₃ 3.90 g/cm³. Weight at packing prevails.
FAQ
Before you order,
you probably ask this.
Anything not covered here — call or message us. We answer around the clock.
What is the minimum order quantity?
What is the lead time?
Can I check samples first?
Can the packing be customized?
Do you supply inspection reports?
What are the payment terms?
Note: the figures above are standard ranges and typical industry values, given for selection only. Special sizes, materials, grades and packing are quoted against your drawing; the contract and technical agreement prevail.
Not sure which one?
Send the duty, the envelope and the target cost — we will suggest material and grade first, price second.