We are a China-based precision machining workshop focused on copper-alloy components, supplying CNC machined bronze in China and worldwide to OEM builders, gearbox manufacturers, valve works, pump producers and maintenance teams. Send a drawing, a physical sample or a 3D model, and we machine the bronze part to specification — from a single prototype to long-running, high-volume series production.
Bronze is not a side material for us — it is one of the material groups we machine every day. Tin bronzes, phosphor bronzes, leaded bearing bronzes, aluminum bronzes and high-strength manganese bronzes each behave differently under the cutting tool: they pull heat away differently, form chips differently and call for dedicated tool geometry, coolant strategy and work-holding. Our process planning starts from those differences so that bores stay round, threads stay clean and mating surfaces hold their tolerance across an entire production batch.
Every order is built to the customer's own drawing. We select the matching grade under a GB/T, ASTM/SAE, EN/DIN or JIS designation, machine from centrifugally cast tubes, continuously cast hollow bars, extruded rods or customer-supplied castings, and finish the part ready for assembly. For buyers sourcing CNC machined bronze in China, this means one accountable workshop for material selection, machining, inspection and surface preparation.
Parts leave the workshop clean, deburred and dimensionally checked against the drawing, with thread systems, fit tolerances and cosmetic requirements agreed before the first cut.
A single bronze component often combines turned diameters, milled flats, cross-holes and internal threads. Keeping these processes in one controlled workflow reduces repeated set-up error and protects the relationship between features.
OD and ID turning, facing, grooving, boring, parting-off and single-point threading on bar stock, cast tubes and billets. This is our main process for bearing bushes, sleeves, flanged bushes, spacer rings, valve seats, threaded nuts and every circular component where concentricity, cylindricity and a fine surface finish matter.
Three-axis milling handles planes, pockets and prismatic features; four-axis indexed machining completes features around a part in a single set-up; five-axis machining reaches compound angles and continuous contours such as worm-wheel tooth geometry, helical pockets and complex valve bodies. Fewer set-ups mean tighter feature-to-feature accuracy on every CNC machined bronze part.
Straight holes, cross-holes, angled holes and deep holes are produced by spot drilling, drilling, boring and reaming, with counterboring and countersinking where fasteners seat. Hole position, diameter consistency and internal surface quality are controlled to drawing, including intersecting oil galleries and lubrication channels typical of bronze bearings.
Internal threads are produced by tapping, thread milling or single-point threading, depending on size, pitch and alloy. We work to metric M threads, unified UNC/UNF/UNEF, British BSP/G parallel and NPT tapered threads, and threads are checked against the corresponding limit gauges before parts leave the workshop.
“Bronze” covers a broad family of copper alloys. The cross-reference table in the next section maps common commercial grades across national standards, while these cards summarize how each family typically behaves and where it is used.
The classic bearing and gear material, combining good strength with wear resistance and corrosion resistance in water, steam and mineral oils. Typical parts include gear blanks, worm wheels, bushes, sealing rings and valve trim.
Phosphorus raises stiffness, fatigue resistance and spring-like behavior, while tin provides low-friction wear performance. It suits fine-pitch gears, lead-screw nuts, spring seats, contact components and parts with thin walls or precise internal threads.
Finely dispersed lead gives excellent anti-seizure, conformability and embeddability, making leaded bronzes the default choice for boundary-lubricated bearings and bushes under mixed load and speed conditions, including crankshaft and pump bearings.
Among the strongest copper alloys, with high hardness, outstanding corrosion and erosion resistance and reliable behavior in seawater and aggressive fluids. Used for impellers, spindles, flanges, heavy gears, valve bodies and high-duty couplings.
Nickel additions raise strength, toughness and seawater corrosion resistance further. This family handles the most demanding marine, offshore and heavy-engineering duties: propeller hardware, winch components, large valve bodies and high-torque gears.
A high-tensile, high-toughness alloy family used where loads are heavy and shock is present. Typical machined parts include brackets, levers, coupling halves, lifting hardware, gear racks and slow-speed, heavy-load gears.
Customers order CNC machined bronze in China under different designation systems. The table below maps the commercial grades we machine most often; the named standard printed on the drawing always governs chemistry, temper and acceptance values.
| Alloy family | China GB/T 1176 / QB | USA ASTM B505 · SAE · CDA | Europe EN 1982 / DIN 1705 | Japan JIS H5120 / H5121 | Typical application |
|---|---|---|---|---|---|
| Tin gunmetal | ZCuSn10Zn2 | C90500 · SAE 62 | CuSn10Zn2-C / G-CuSn10Zn (RG10) | BC3 · CAC403 | Gears, valves, pump bodies and sealing rings |
| Leaded bearing bronze | ZCuSn5Pb5Zn5 | C93200 · SAE 660 | CuSn7Zn4Pb7-C · CC493K (RG7) | BC6 · CAC406 | General bushes, plain bearings and thrust washers |
| High-lead bronze | ZCuPb15Sn8 / ZCuPb10Sn10 | C93700 · SAE 64 | CuPb15Sn8-C · CC496K / G-CuPb15Sn | LBC series (LBC2–LBC5) | High-speed bearings and thin-wall bushes |
| Cast phosphor bronze | ZCuSn10P1; QSn6.5-0.1 (wrought) | C90700 · SAE 65; C54400 (wrought) | CuSn11P-C / G-CuSn12 (2.1052) | PBC2 · CAC602 | Worm wheels, gears and lead-screw nuts |
| Aluminum bronze | ZCuAl10Fe3; QAl9-4 (wrought) | C95400 | CuAl10Fe2-C · CC331G / G-CuAl10Fe | ALBC2 · CAC702 | Impellers, spindles, flanges and valve bodies |
| Nickel-aluminum bronze | ZCuAl9Fe4Ni4Mn2 | C95800 / C95500 | CuAl10Fe5Ni5-C · CC333G / G-CuAl10Ni | ALBC3 · CAC703 | Marine hardware, heavy gears and seawater valves |
Equivalences are indicative rather than identical — neighboring standards differ slightly in chemistry and mechanical values. The exact grade, temper and chemistry are confirmed on the order documentation before production starts.
The same CNC equipment and inspection discipline apply whether the order is one replacement bush or a standing monthly production release.
Single replacement parts, first articles and engineering prototypes are machined from a drawing or a reverse-engineered sample, including obsolete bushes and worm wheels with no spare available on the market.
Runs from a few pieces to several hundred suit machine builders, maintenance stocks and product development. Simple jigs and soft jaws keep set-up time and unit cost under control.
Repeat batches run from fixed set-up sheets and proven tooling lists, so parts from the sixth release match parts from the first in size, finish and appearance.
For ongoing demand we optimize fixturing, use bar-fed turning and multi-part milling cycles, and plan production in stable lots to support releases of thousands or tens of thousands of pieces.
Machining is followed by the smaller operations that decide whether a bronze part is truly ready to fit on the customer's line.
Precision bore sizing and fine internal surfaces for press-fit and running clearances.
Internal keyways, slots and spline preparations on bushes, hubs and gear blanks.
Size correction and fine finishes after heat treatment or for tight-fit mating parts.
Controlled bore geometry and low-roughness running surfaces for bearing applications.
Accurate internal and external threads, including large diameters and coarse pitches.
Burr removal at cross-holes and controlled edge breaks on every exposed edge.
Uniform cosmetic surfaces, from brushed satin finishes to mirror polishing.
Grade or lot marks, moisture-protective treatment and separated export packaging.
Geometry, tolerances and service conditions are reviewed, then the bronze grade and stock form — cast tube, continuous-cast bar or wrought rod — are confirmed.
The quote lists process route, stock allowance and lead time. Where a feature is expensive or risky to machine, it is flagged with alternatives before production begins.
A first article is machined and fully inspected; critical dimensions are recorded and confirmed with the customer before the batch is released.
Approved processes, tooling and offsets are repeated across the batch, with in-process checks at set intervals on diameters, hole positions and threads.
Deburring, finishing and cleaning are completed, followed by final dimensional inspection, thread gauging and a visual check against the drawing.
Parts are dried and protected against moisture, packed to avoid contact damage and prepared for domestic or international freight.
Worm wheels, worm-gear rims, gear blanks, bearing housings and shaft sleeves for reducers, conveyors and transmission equipment.
Valve seats, sleeves, gland bushes, distributor bodies and threaded inserts for hydraulic and pneumatic systems.
Impeller wear rings, shaft sleeves, throat bushes, sealing seats and wearing rings for water, oil and chemical media.
Seawater valve parts, propeller-shaft bushes, winch and crane components in aluminum and nickel-aluminum bronze.
Pivot bushes, linkage sleeves, hinge bearings and wear plates for dusty, shock-loaded working conditions.
Sheaves, pulley bushes, hoist gears, elevator components and crane slewing bearings under continuous cyclic load.
Dedicated tool geometry, sharp cutting edges and a coolant practice tuned to soft, heat-pulling bronze alloys — for clean chips, unmarred surfaces and stable bore sizes.
Cast and wrought bronzes across GB/T, ASTM/SAE, EN/DIN and JIS designations, sourced as centrifugal tube, continuous-cast bar, plate or customer-provided casting.
Turned, milled, drilled and threaded features are finished in one routing, removing the tolerance stack-up that comes from splitting work between several shops.
Features are held to drawing, commonly in the IT6–IT8 range with turned surfaces around Ra 1.6–3.2 µm; critical dimensions are recorded for first articles.
One-off reverse-engineered spares and long-term volume programs run on the same machines, with the same inspection mindset from first cut to final piece.
English drawing communication, metric and inch threads, neutral or customer-branded packaging and production planning aligned to sea-freight schedules.
A small selection of bronze components produced on our workshop floor.
It depends on load, sliding speed, shaft hardness and lubrication. Leaded tin bronzes such as C93200 / SAE 660 suit general boundary-lubricated bushes; high-lead grades suit high speed with limited lubrication; phosphor bronzes suit gear and wear duty; aluminum bronzes are chosen for strength and corrosion resistance. A grade can be suggested once the application conditions are known, while the final designation follows your drawing or engineering standard.
Yes. We machine customer-supplied sand castings, centrifugal castings, forgings and extruded stock, and we can also source matching stock ourselves. For bushes and rings, centrifugally or continuously cast hollow bar removes far less material than a solid billet and shortens cycle time.
General machined features are commonly held in the IT6–IT8 range; turned bearing bores can be controlled more tightly where fit and roundness require it, and turned surfaces routinely reach Ra 1.6–3.2 µm. The binding values are always the tolerances marked on your drawing.
Yes. Common examples include bronze worm-wheel rims mounted on cast-iron or steel hubs, bronze bushes pressed into steel housings, and steel shafts running against machined bronze sleeves. We machine the bronze component to the interference or clearance fit your assembly requires.
Whether the requirement is a single obsolete worm wheel or a standing monthly release of bearing bushes, every CNC machined bronze part from our China workshop follows the same route: the correct grade, the right combination of processes, disciplined inspection and assembly-ready finishing. Buyers looking for CNC machined bronze in China can build a complete bronze-component program with us — prototype, batch and high-volume production alike.
We provide custom machined parts, 5-axis linkage CNC machining, and the design, production, and assembly of machinery and equipment.