SF- 1 is not a standard for bearings, but a series of self-lubricating bearings, equivalent to DU series abroad.

And SF-2, DX and so on.

SF- 1: It is a rolling sliding bearing with steel plate as matrix, spherical bronze powder sintered in the middle and a mixture of PTFE and lead rolled on the surface. It has the characteristics of low friction coefficient, high wear resistance, good corrosion resistance and oil-free lubrication.