Beryllium Copper Alloy 25 (UNS C17200/CDA 172)

CDA 110 is available in Sheet, Plate, Bar, Strip, Pipe. CDA 110 Foil (Shim) is available in various thicknesses.BS C101 is available in Foil, Strip, Bar and Sheet. For all other stock availability contact Sales.

UNS American Spec
C17200 AMS 4725
AMS 4530
AMS 4532
AMS 4650
AMS 4651
AMS 4533
AMS 4534
AMS 4535
AMS 4650

Technical Data Sheet

Chemical Composition Limits
Weight % Cu Al Be Co
AMS 4533
CDA 172 
Rem 0.20 1.8-2.0 0.2 min

CDA 172 Beryllium Copper is commonly used due to it's high strength and hardness compared to other commercial copper alloys. CDA 172 strength and hardness is similar to that of steel. To achieve it's high strengths whilst still maintaining acceptable levels of toughness for many industrial applications CDA 172 is age hardened. Toughness, fatigue strength, corrosion resistance etc can be modified and controlled by either underaging or overaging during the precipitation hardening process of the alloy.

Typical Mechanical Properties

Material Condition Size Tensile strength ksi Yield Strength ksi Elongation 2" % Hardness
CDA 172 Round Bar Sol + Precipitation heat treated ( TF00 formerly AT)   165 140 4 36-45 HRC
CDA 172 Round Bar Sol Treated, Cold Worked + Precipitation Heat Treated (TH04, formerly HT) < 0.375" 182 157 3 37-45
CDA 172 Round Bar Sol Treated, Cold Worked + Precipitation Heat Treated (TH04, formerly HT) 0.375" - 1.00" 180 154 3 37-45
CDA 172 Round Bar Sol Treated, Cold Worked + Precipitation Heat Treated (TH04, formerly HT) 1.00" - 2.00" 177 150 3 37-45

Physical Properties

Density - 0.298 lb/in3 at 68 F
Coefficient of Thermal Expansion - 9.9 ·10-6 per oF (68-572 F)
Thermal Conductivity - 62 - 70 Btu · ft/(hr · ft2·oF)at 68 F
Relative Magnetic Permeability (u) - 1.003
Modulus of Elasticity in Tension - 18500 ksi
Machinability Rating - 0%

Typical Uses of CDA 172 (AMS 4533, AMS 4534, AMS 4535, AMS 4650, AMS 4651)

Oil & Gas - Instrument Housings, Flex Shafts, MWD & LWD Components, Bearings, Bushings, Valve Components, Pump Shafts

Aerospace - Landing Gear Bushings, Aircraft Components, Cryogenics

Automotive - RWMA Tooling, Plastic Molds, Electronic Components

Electrical - Contact Bridges, Clips, Spring Connectors, Current Carrying Navigational Instruments, Relay Parts, Electrical Switch and Relay Blades, Connectors, Switch Parts, Fuse Clips

Fasteners - Bolts, Screws, Roll Pins, Retaining Rings, Lock Washers,Belleville Washers, Fasteners, Washers

Other Industrial - Flexible Metal Hose, Non Sparking Safety Tools, Shafts, Pump Parts, Rolling Mill Parts, Bearings, Bushings, Valve Seats, Valve Stems, Diaphragms, Housings for Instruments, Wear Plates onHeavy Equipment, Bourdon Tubes, Bellows, Springs, WeldingEquipment, Spline Shafts, Valves, Pumps, Springs,Electrochemical

Ordinance - Firing Pins


Copper Alloy 25 Bar AMS 4650, AMS 4651, AMS 4533, ASTM B194, ASTM B196, MIL C 21657, SAE J463, SAE J461
Copper Alloy 25 Extrusions ASTM B570
Copper Alloy 25 Forgings AMS 4650, ASTM B570
Copper Alloy 25 Plate ASTM B194
Copper Alloy 25 Rod AMS 4650, AMS 4534, AMS 4651, AMS 4533, ASTM B196, MIL C 21657, SAE J463, SAE J461
Copper Alloy 25 Forging AMS 4650
Copper Alloy 25 Sheet ASTM B 194
Copper Alloy 25 Strip ASTM B 194, SAE J463, SAE J461
Copper Alloy 25 Tube Seamless AMS 4535, ASTM B643
Copper Alloy 25 Wire AMS 4725, ASTM B197, SAE J463, J461
Copper Alloy 25 Other UNS C17200

Harsh Steel export Copper C17200 to below countries.

Harsh steel is a major stockist and Exporter of Copper C17200 to many countries of the world such as Singapore, Brisbane, Sydney, Melbourne, Australia, Houston, TX, San Diego, San Francisco, Atlanta, USA, Brentford, United Kingdom, Phoenix, Ireland, New Zealand and Canada, Western Australia , Queensland, New South Wales, South Australia, Victoria, Australian Capital Territory, Tasmania, Northern Territory, Ontario, British Columbia, Yukon Territory, Alberta, Manitoba, Saskatchewan, New foundland, Prince Edward Island, New Brunswick, Nova Scotia, Eastern Cape, Gauteng, Kwazulu-Natal, Western Cape, England, Scotland, Wales, Northern Ireland, Lagos, Abuja Capital Territory, Vadodara, Mumbai, Chennai, New Delhi, Mahape, Gurgaon, Noida, Bangalore, Coimbatore, Cochin, Ash Sharqiyah, Ar Riyad, Makkah, Dhahran, Riyadh, Jiddah, Jeddah, Masqat, Kwazulu-Natal, Gauteng, Western Cape, Free State, Eastern Cape, Alberta, Saskatchewan, British Columbia, Newfoundland, New Brunswick, Manitoba, Ontario, Nova Scotia, Quebec, Calgary, Edmonton, Vancouver, Toronto, Birmingham, Brentford, Manchester, Bristol, Sheffield, Milton Keynes, London, Poplar, Edinburgh, Thames Ditton.

Enquiry for Beryllium Copper Alloy 25 (UNS C17200/CDA 172)