... life 3.Small orders accept Product Name:Adapter SleevesSpecifications:We produce and supply Adapter Sleeve, Series H2, H3, H30, H31, H23, H32 ... , and a threaded side. For stepped shafts, they have two supply ducts and distribution grooves on the outer surface. 3. Withdrawal ... oil ducts and distribution grooves, on the threaded side.4. We supply the Adapter Sleeves in accordance with ISO H3/1-1979 ...