Enduro Bearings 71806 LLB - ABEC 5 - Angular Contact Ball Bearing - 30x42x7mm ABEC 5 angular contact bearing with 30 mm inner diameter, 42 mm outer diameter, 7 mm thickness and double-lip type sealing with light contact, making a labyrinth seal. In standard radial bearings, only 3 or 4 balls make contact during the load, at any given time. In Angular Contact (A/C) bearings, ALL balls are engaged and spread the force over a larger surface area, to decrease friction and minimize wear. ABEC 5 bearings use grade 5 Chromium Steel Balls and 52100 High Carbon Chromium Alloy Races. The high precision balls are within 5/1.000.000″ round. These are military level specification, used for precision equipment. R-64 hardness, of the highest grade. Vacuum de-gassing process for the purest chromium alloy steel, hardened to R-62, extremely tough and very durable. Polished to a mirror finish for ABEC-5 precision and noiseless movement. Nylon with graphite retainers are virtually frictionless while providing constant lubrication. To meet the ABEC-5 standard, bearing design must pass all tests, which include noise testing at high RPM, extremely close tolerances for I.D. and O.D., roundness of ball, trueness of the races and micro surface finishes of balls and races. C-3 Clearance Manufacturer item code: 71806 LLB Weight supplement: manufacturer spec Can Whatsapp / Call . https://wa.me/60126960321 Vince . https://wa.me/60126105929 Shop . office 03-8060 8967 Operation Hour Monday to Saturday (10.30AM TO 7PM) *Sunday Close* ----------------------------------------------- (VK CYCLES PUCHONG) SANTA CRUZ Map - https://goo.gl/maps/8y79tAyzkEE2 (LOCATION) No 39, Jalan BP 7/2 , Bandar Bukit Puchong, 47100, Selangor , Puchong Facebook - https://www.facebook.com/SpecialistRepairBicycles/ Instagram - VK CYCLES