BR Technical Characteristics

Bronze continues to be the main material used for friction bearing production. The range of alloys developed and the great variety of existing lubricants allow its use in a wide spectrum of operating conditions.

In order to meet the widest range of applications, Mecauto in collaboration with its parent company the continuous and centrifugal cast bronze foundry Wisco Española offers four alloy groups from which we have selected the most significant ones: Tin Bronze, Lead Bronze, Aluminium Bronze and High Tensile Brass. However, and thanks to this collaboration, other alloys which have not previously been mentioned can be manufactured where necessary.

Table of general characteristics of MECAUTO’s bearings

BG BR
Specific / dynamic / static load MPa 50*
140*
50*
140*
Temperature -10…+250* -10….+100*
Friction Coefficient μ 0,04…0,20 0,80…0,15
Maximium speed m/min 18* 30
Shaft Tol. e7 – e8 f7 – f8
Shaft rugosity Ra. 0,8…1,6 0,8…1,6
Housing Tol. H7 H7
Shaft hardness HBW 180 – 400* 180 – 400*
Self lubricating Highly recommended Inadequate
Dirt acceptance Suitable Inadequate
Corrosion Suitable* Suitable*
High Loads Highly recommended* Neutral
Impact / vibration Suitable Suitable
High shaft rugosity Suitable Suitable
Small play Inadequate Inadequate
Misalignment Suitable Suitable
Price Neutral Neutro

* Values may vary according to alloy

  • Highly recommended
  • Suitable
  • Neutral
  • Inadequate

Properties of the diferent bronze alloys

Alloy W-7 W-12Zn W-12 W-AlNi W-255
Standard S/EN 1982 CC493K CC482K CC483K CC333G CC762S
Tensile strength MPa 260 280 300 650 750
Yield point 0.2% MPa 120 150 150 280 480
Elongation 5D% A5% 12 5 6 13 5
Hardness HBW 10/1000 70 90 90 150 190
Yielding module GPa 98-115 90-110 90-110 110-128 105-115
Density kg/dm³ 8,8 8,7 8,6 7,6 7,8
Specific heat J/ (g * K) 0,356 0,373 0,376 0,418 0,376
Thermal expansion 10-6 K 18,5 18,6 18,5 17-19 18
Thermal conductivity W/m * K 64 55 54 60 45-55
Electrical conductivity MS/m 7,5 6,5 6,2 4-6 7-8

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