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 | Cº | -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
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 |
Are you interested in our products?
Request a no obligation, tailored quote.