Cast Bronze

Bronze CDA 67500

Specs: QQ-B-728, ASTM-B-138, ASTM-B-124
UNS# C67500

Manganese Bronze C67500 (Bronze CDA 67500) is strong, rigid and abrasion-resistant, has excellent hot working capacity as well as exceptional ratings for soldering and brazing. Its principal components are Copper and Zinc, with slight amounts of Lead, Tin, Iron, Aluminum, and Manganese.

This cast bronze alloy combines high strength with good corrosion resistance, making it ideal for automotive clutch discs, pump rods, balls, valve stems, and shafting.


Alloy C67500 (CuZn37FeSnMn) is a wrought Manganese Bronze alloy with additions of iron, tin, and manganese to increase the strength and corrosion resistance.


The alloy can be cold worked to increase the strength and can be supplied in the half-hard and fully-hard condition.


It has excellent hot working properties and can be close die forged into valves, connectors, and other components for military applications. It can also be hot-headed or upset forged for manufacturing fasteners.


Manganese Bronze C67500 can be joined by soldering, brazing, and oxyacetylene welding and has a machinability rating of 30% compared with 100% for free machining brass.


The addition of tin aids its corrosion resistance in mild acidic waters.

Available shapes –  round and hex


Related Products



  • Clutch Discs
  • Pump Rods
  • Shafts
  • Ball Valves
  • Valve Stems
  • Valve Bodies
  • Fasteners

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Specifications of Bronze CDA 67500

Rod, Bar
& Profile
UNS C67500
Alloy A
ASTM B 138 ASTM B 124
ASTM B 283
SAE   SAE J463
SAE J461
Federal   QQ B 728  
Mechanical Properties

Mechanical Properties of Bronze CDA 67500

Product Form Condition Size
Imperial Metric
Ksi    N/mm²
0.5% Yield
Ksi    N/mm²
Shear Strength
Ksi    N/mm²
Rod & Bar H02
Half Hard
<=1” (<=25mm) 72-77   500-530 36-45    50-310 13-23 83 47   325
    >1-2.5” (>25-65mm) 70-72   450-495 35-42    240-290 15-27 77 44   305
    >2.5” (>65mm) 65-70   450-485 32-35    220-240 17-30 70  
Physical Properties

Physical Properties of Bronze CDA 67500

Physical Properties Imperial Units Metric Units
Density 0.302lb/in³ 8.36g/cm³
Melting Range 1590-1630ºF 865- 890ºc
Hot Working Range 1157-1454 ºF 625-790 ºc
Mean Liner Expansion 20-300ºc   0.021 ºc x10-³
Mean Liner Expansion 68-572 ºF 0.00118 ºF x10-³  
Specific Heat 0.090Btu/lb/ ºF @68ºF 377J/kg ºK @20 ºc
Thermal Conductivity 61Btu /ft²/fth ºF @68ºF 105.6W/m. ºK
Electrical Conductivity 24% IACS @68ºF 0.14m/_mm²
Electrical Resistivity 2.82µ_in 7.2 μΩcm
Modulus of Elasticity 10³    
Tension 15ksi 103N/mm²
Rigidity 5.6ksi 39N/mm²

While the data is believed to be accurate, Wieland Diversified makes no representation or warranty of any kind (expressed or implied) and assumes no responsibility with respect to the accuracy and values shown above; this information should only be used as a guide.

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