LB4 / C93500


BS1400:LB4 is a leaded Bronze LB4 containing approximately 9% lead and 5% Tin. These additions create an alloy with excellent machining properties, good wear properties, a medium strength and a good corrosion resistance. It will withstand some weaker acids in contaminated waters.

Suitable for bearings where low to moderate loads are used the LB4 is also ideal for applications with little lubrication or possible miss-alignment for short periods. The LB4 is most suitable for mild steel shafts with low loadings or hard shafts with moderate or low loads and speed.

Related Specifications

BS1400: LB4

AS1565 93500

ASTM B505 - C93500


Nominal Composition

Cu      Remainder

Sn      4.0 - 6.0%

Zn      2.0% max

Pb      8.0 - 10.0%

P        0.10% max

Ni       2.0% max

Sb      0.5% max

Fe      0.25% max

Others  0.5% max

Mechanical Properties (Continuous Cast)

Ultimate Tensile Strength

230 N/mm2

0.2% Proof Strength

130 N/mm2


9 %

Key Features

  • Excellent machinability
  • Good corrosion resistance
  • High wear resistance
  • Reasonable strength levels

Typical Physical Properties


8.87 g/cm3

Melting Point


Electrical Conductivity

15% IACS

Coefficient of Thermal Expansion 20-300?C

18 x 10-6

Thermal Conductivity

70 W/m?C

Fabrication Properties

Stress Relieving temperature


Max operating temperature


Hot working temperature 

Not recommended 

Hot formability

Not recommended

Cold Formability

Not recommended

Machinability Rating


Joining Methods





MIG Welding

Not recommended

TIG Welding

Not recommended

Resistance Welding

Not recommended

* Since brazing is performed at temperatures within the hot short range, strain must be avoided during the brazing and cooling of this alloy.

Typical Uses

The main application areas for the LB4 material are low load and low speed bearings for mild steel shafts.

This technical information is given by Holme Dodsworth Metals without charge and the user shall employ such information at their own discretion and risk. For more detailed technical advice on temper selection, fabrication, joining, machining, physical and mechanical data please contact us as space does not permit the listing of every feature of the material