JDB-50is a reinforced product of JDB series. It is based on steel GCr15 and embedded with solid lubricant. It is of high compress strength and particularly suitable for supporting position in hoisting machines,e.g. The support or stand of windlass and of crane. But it should not be applied in water or in acid/alkali circumstance. Can be used under low, middle and highload. Due to its superb high hardness, when under high  load, it overperforms other JDB type

Base material GCR15
Material hardness 55-60HRC
Maximum temperature 350°C
Max Load Capacity P 250N/mm²
Coefficient of friction u <0.17





Solid Lubricant

Solid Lubricant Cu Sn
SL1 High purity graphite + additives Good wear resistance and chemical stability, the use of temperature <400°C Used in general machinery, used in the atmosphere
SL4 PTFE + additivesl Very low coefficient of friction and good moisture, the use of temperature <300°C Used in water, sea water lubrication, such as ships, hydraulic arc gate, turbine, pharmaceutical beverage machinery.

Alloy Material

Corresponding Brands/Type JDB-10 JDB-20 JDB-30 JDB-40 JDB-50
China Brands GB1776-87 ZCuZn25Al6Fe3Mn3 ZCuSn6Zn6Pb3 (steel)+ZCuSn6Zn6Pb3 GCr15 HT250
International ISO1338 GCuZn25Al6Fe3Mn3 GCusn6Zn6Pb3 (steel)+CuSn6Zn6Pb3Fe3Ni5 B1 -
Germany DIN G-CuZn25Al5 GB-CuSn5Zn5Pb5 (steel)+CuSn6Zn6Pb3Ni 100Cr6 -
Japan JIS HBsC4 BC6 BC6 SUJ2 FC250
America ASTMUNS C86300 C83600 C83600 52100 Class40
England Standard HTB2 LG2 LG2 - -

Technical Data

Performance index/Type JDB-10 JDB-20 JDB-30 JDB-40 JDB-50
Max Move Load Capacity 100 60 70 250 60
Max Sliding Speed dry0.4 oil0.5 2 2 0.1 0.5
Max PV Value Limit 3.8 0.5 0.6 2.5 0.8
Density 8.0 8.0 7.6 7.8 7.3
Tensile Strength >600 >250 >500 >1500 >250
Elongation >10 >4 >10 - -
Hardness >210 >80 >80 HRC>55 160
Max Woking Temperature 300 350 300 350 400
Friction coefficient

Oil Lubrication:0.03

Dry Friction:0.16