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They have a 30° contact angle which can operate at much higher speeds than bearings with a 40° contact angle
623 04 2rs1 Deep Groove Ball Bearings 20mm - Bore Size Rubber Seals on Both Sides of Bearing Normal Radial Internal Clearance
MHD25 C2 R240 T1 H S2 Maintenance Free Standard Block Type Top Mounting Linear Way Unit Two Carriages 240mm - Rail Length Light Preload High Accuracy Class S2 Specification
Excellent Load-carrying Capacity
ST 3/4 1020-3/4G 2 Self Lube Cast Iron Take-up Bearing Unit Set Screw Lock - Long Inner Ring Bearing Insert Casting Group
SYNERGY 160-3-NO107 - RENOLD 2 Inch Pitch Synergy Link NJ2207-EC-ML/C3 They have a 30° contactFor use with all sizes and types of chain where optimum security is desired. The link is supplied with bearing pins riveted into one outer plate. The other outer plate is an interference fit on the bearing pins, the ends of which should be riveted over after the plate is fitted. Press fit connecting links should only be used once; new links must be used to replace dismantled links. (See Riveting Chain Endless' for full instructions).