Bronze Machining Services

DEK delivers bronze machining to ±0.005 mm across C544, C841, 932 and 954 grades for bushings, gears and marine parts. Backed by 20+ years in precision machining and 1.2M+ parts machined annually.

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±0.005mm
Tolerance Capability
4
Bronze Grades
1000 mm
Max Part Size

ISO 9001:2015 Certified AS9100D and ISO 13485 certified

Why Manufacturers Choose Bronze Machining

Bronze is a copper-tin (or copper-aluminum) alloy family that combines low-friction bearing performance with genuine corrosion resistance. It is specified when a part must slide, seal, or survive a marine or chemical environment without galling or pitting, which is why it dominates bushings and sleeve bearings.

Machinability varies widely by grade: sintered bronzes cut easily, aluminum bronze is tougher on tooling. Phosphor bronze adds conductivity for connectors and springs. Our metal machining team matches the grade to your duty cycle before quoting.

Natural lubricity for bushings and bearings
Resists saltwater and industrial fluids
Dimensionally stable under cyclical load
ISO 9001, AS9100D and ISO 13485 certified

Bronze Alloys We Machine

Four bronze grades most commonly specified in industrial and precision work; each behaves differently under the tool and suits a different job.

C544
Phosphor bronze, fine grain
For electrical connectors, springs, wear plates and gears needing tight surface specs. See C544 phosphor bronze.
C841 / Bronze 932
Sintered and bearing bronze
Free-machining C841 and classic 932 for self-lubricating bushings, wear rings and sleeve bearings. See C841 sintered bronze.
Bronze 954
Aluminum bronze, harder
For marine fittings, valve components and structural gears; expect longer cycles. See Bronze 954.

±0.005mm
General bronze tolerances
±0.003mm
Micro parts under 10 mm
1000 mm
Largest structural parts

How We Machine CNC Bronze Parts

Feeds, speeds and tooling are set per alloy to manage chip formation and heat buildup, which can expand a bore mid-cut.

1

Bronze CNC Turning

Bores, ODs and threads on bushings and connectors run on CNC lathes, where bronze's bearing properties are used. See CNC turning.
2

Bronze CNC Milling

Flats, slots and mounting geometry on brackets, gears and valve bodies, on 3-, 4- and 5-axis centers. See CNC milling.
3

Swiss Turning

Small connectors, bushings and precision pins on Swiss-type lathes, supported close to the tool to avoid deflection. See Swiss turning.
4

CMM Inspection

Checked on CMM at first article and again at outgoing inspection, whether C841 bushings or C954 marine valve parts. See QC equipment.

Bronze Machining Considerations

Key factors our engineers weigh when matching a bronze grade and process to your part's load, mating material and environment.

1

Grade Drives Cost

Matching alloy to duty cycle is the biggest lever on cost. C841 or C544 cut faster and cheaper than C954; under-specifying a marine fitting into a softer grade risks failure.
2

Heat and Bore Growth

Bronze generates more heat than aluminum at comparable feeds, which can expand a bore mid-cut and pull it out of tolerance once the part cools.
3

Fit-Critical Bronze Tolerances

Shaft-bore fits and coaxiality on bushings and bearings are held to ±0.005 mm, which determines how a bushing performs against its mating shaft.
4

Aluminum Bronze Tool Wear

C954 is harder and wears tooling faster, so it runs at more conservative feed rates and longer cycle times, with the same inspection stages applied.

Bronze Grades We Machine

Explore our bronze grade pages: C841 sintered bronze, 932 bearing bronze and 954 aluminum bronze, each with machining notes and pricing.

Bronze vs Brass, Copper or Delrin

How bronze compares with alternatives our engineers often suggest when wear resistance, conductivity or cost drives the choice.

Criteria	This MaterialBronze	Brass	Copper	Delrin
Choose it for	Wear, corrosion	Lower cost	Conductivity	Light bearings
Machining speed	Slower	Faster	–	–
Strength	High	Lower	Far less	–
Wear resistance	High	Lower	Far less	–
Cost	Higher	Lower	–	Lower

Where Custom Bronze Parts Are Used

Bronze parts machined at DEK serve industrial equipment, robotics, energy, aerospace, automotive and semiconductor programs.

CNC Machining + Finishes for Bronze

Bronze parts leave DEK machined and plated or polished; anodizing is aluminum-specific and does not apply to bronze.

Surface Finishes

Plating
Polishing
Powder Coating

Need another finish? See all surface finish options

Bronze Machining FAQs

Common questions from engineers sourcing custom bronze parts.

What are the disadvantages of bronze for machined parts?

Bronze costs more than brass or plain steel, and most grades machine slower than free-cutting brass, with longer cycles and more tool wear, especially aluminum bronze (C954). Sintered bronze (C841) machines far more easily, so grade selection affects cost as much as performance.

What drives the cost of a bronze machined part?

Alloy choice is the biggest factor: C841 or C544 cut faster and cheaper than C954. Feature complexity (tight bores, thin walls), tolerance level, part size and finishing (plating or polishing vs. as-machined) add cost. Setup cost spreads thinner across larger batches.

What finishes are available on bronze parts?

Plating and polishing are standard: plating for wear resistance or appearance, polishing for a smoother functional surface on bearing and sealing faces. Anodizing is not used on bronze since it is an aluminum-specific oxide process; powder coating suits larger, non-precision hardware.

Can you hold tight ID tolerances on bronze bushings?

Yes. Fit-critical bores on bushings and bearings are held to ±0.005 mm as standard, and micro-scale bushing IDs under 10 mm to ±0.003 mm. Coaxiality between bore and OD is controlled at the same level, which determines how a bushing performs against its mating shaft.