673 manganese bronze (UNS C67300) is a wrought copper-zinc alloy used for bushings, pins, bearings, fasteners, and wear-related machined components. Despite the trade name, C67300 is not aluminum bronze. It contains manganese and silicon with copper and zinc, and its actual mechanical properties depend on temper and section size.
Download the Mozaic 673 Manganese Bronze Round Bar technical reference sheet (PDF)
673 Manganese Bronze Round Bar — Technical Specifications
| Property or designation | Reference information |
|---|---|
| Alloy / UNS | C67300 / 673 manganese bronze |
| Alloy family | Wrought copper-zinc alloy; manganese bronze trade family |
| Copper (Cu) | 58.0–63.0 wt% |
| Lead (Pb) | 0.40–3.0 wt% |
| Manganese (Mn) | 2.0–3.5 wt% |
| Silicon (Si) | 0.50–1.5 wt% |
| Zinc (Zn) | Balance |
| Density | Approximately 8.3 g/cm³ |
| Illustrative H02 temper, bar ≤1 in OD | Minimum tensile 65 ksi; minimum yield 40 ksi per referenced SAE J463 data; not valid for all products |
Reference values only; the actual mill test report and ordered specification control. Mechanical properties, dimensional suitability, and performance vary by processing and condition.
Applications and Grade Selection
673 bronze is considered for wear components, lead-screw nuts, bushings, and machined hardware. Specify mating surface, load, lubrication and tolerances; these affect service suitability. If aluminum bronze is required, compare 954 aluminum bronze instead of substituting another bronze by name.
Precision Ground Bar Stock and Purchasing
Mozaic can review 673 bronze sourcing, cutting, straightening, and centerless grinding for specified bar dimensions. Include temper, OD, final diameter, length, surface finish, lot documentation, and quantity. Explore our bronze bar stock overview for related copper-base alloys. See Mozaic’s centerless grinding services.
Common Questions
Is 673 bronze the same as C954 aluminum bronze?
No. C67300 is a copper-zinc-manganese-silicon alloy, whereas C95400 is an aluminum-bronze grade with different chemistry and performance.
Do published 673 bronze strength figures apply to any diameter?
No. Mechanical-property references must be matched to the actual material condition, bar size, and purchasing specification.
Request a Quote
For quotation and availability, contact Mozaic Precision Metals, email sales@mozaicprecision.com, or call 847-637-8379.
Technical source: manufacturer / industry alloy reference. This Mozaic reference is not a mill certification.