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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

Availability
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.

Specifications
Continuous
ASTM B-505
AMS 4881
SAE J462, J461
Centrifugal
ASTM B-271
DELTA AB29
UNS C95520
Euro Equivalents Designation
CuAl10Fe5Ni5-B | CB333G
Standard
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

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Disclaimer
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.