Nickel Aluminium Bronze AMS 4881 (UNS C99520)

Technical Data Sheet

Chemical Composition Limits
Weight % Cu Al Cr Co Fe Pb Mn Ni Si Sn Zn
AMS 4881
74.5 min 10.5-11.5 0.05 0.2 4.0-5.5 0.03 1.5 4.2-6.0 0.15 0.25 0.30

Nickel Alumimium Bronze - Solid Bar AMS 4881. The additional heat treating process improves mechanical properties and the strength to weight ratio exceeding the range of typical aluminum bronzes. UNS C99520 is commonly used in applications involving heavy loads abrasion,friction, and deformation at high temperatures. In many cases UNS C99520 can replace UNS C63020 with the advantage of this material being available in tube form, which provides economic cost savings to you the customer.

Typical Mechanical Properties

Material Type

Tensile Strength ksi

Yield Strength ksi Elongation 4D %
AMS 4881 Separately Cast Specimins Sand Cast 125 95 2
AMS 4881 Separately Cast Specimins Centifugally 130 95 3

Physical Properties - AMS 4881 Nickel Aluminium Bronze
Melting Point - Liquidus - 1930 F
Melting Point - Solidus - 1900 F
Density - 0.272 lb/in 3 at 68 F
Specific Gravity - 7.53
Electrical Resistivity - 122.8 ohms-cmil/ft @ 68
Electrical Conductivity - 8.5 %IACS @ 68 F
Thermal Conductivity - 24.2 Btu · ft/(hr · ft2· o F)
Coefficient of Thermal Expansion - 9.0 ·10 -6 per o F (68-572
Specific Heat Capacity - 0.1 Btu/lb/o F at 68 F
Modulus of Elasticity in Tension - 16000 ksi
Magnetic Permeability - 1.2
Machinability Rating - 50

Nickel Aluminium Bronze
Sizes available: AMS 4881
SOLID BAR 1/2" - 8" diameter
HOLLOW BAR 5/8" - 2 1/2"
For all other stock availability contact Sales.


ASTM B-505
AMS 4881
SAE J462, J461
ASTM B-271
UNS C95520
Euro Equivalents Designation
CuAl10Fe5Ni5-B | CB333G
EN 1982 : 1998-11

Typical Uses of 4881 Nickel Aluminium Bronze
Oil & Gas - Rock Bit Bearings, Bushings, & Washers, BOP Parts, Wellhead Components
Aerospace - Landing Gear Bushings and Bearings
Automotive - Bearings, Off-Highway Truck Bushings, Forming Roll,Bearings
Marine - Pump Parts, Bushings
Industrial - Cams, Shafting, Hydraulic Bushings for Earth Moving, Equipment, Valve Balls, Cryogenics, Drill Guide Bushings
Military - Tank Track Bearings, Bushings, Aircraft Components

At Aircraft Materials we specialise in the rapid turn-around of orders, with most stock items ready for shipping out the same day to anywhere in the world. For time-critical orders, such as AOGs use our AOG service desk (, the team are dedicated to processing and dispatching orders on the same day, even for cutting orders on bar and sheet products.

Our expertise in global logistics enables us to source material from anywhere in the world in a matter of days and provide fast shipping solutions to all our customers, whichever country they are in. We use a range of transport partners to ship overnight within the UK and Europe, and offer a full range of logistics solutions from priority express services to more cost-effective economy shipments all around the globe. To find out more about our services click here.

Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only. All specifications are subject to change without notice.