Nitrile rubber covered oil seals for temperatures
up to 110c.
R21/SC (SC usually marked on the seal for
single lip) and R23 or TC (TC also marked on the seal for a twin lip) R23
Oil seals have an extra wiper (dust lip or twin lip). These seals have rubber
Nitrile OD with metal insert, primary lip and an additional dirt/dust lip
(sometimes called a wiper) moulded with the overall seal width. They can also
be referred to as "Semi dual" lip type, as the name suggests they
help prevent the ingress of dust/dirt into the primary lip area.