Hudson bearings nbt-1cs – 2w 1 nylon main ball with two hole flange carbon steel housing one inch nylon main ball rotates on a bed of eighty 1/8 inch support balls. Support cup is hardened and plated. The cover is also hardened and plated to resist rust. Hudson bearings is an innovative domestic manufacturer of ball transfers. flange-mounted units feature a hardened and zinc plated mounting cup and a foam seal. housing options include stainless steel with option for felt seal. main and support ball options include stainless, nylon, phenolic, and delrin. flange mounted transfers can be used in either ball up or down position.