CAD drawings, bearing housings, bolt holes, specifications 2 x 4-42 * 52, what do these figures represent?
Front should be specifications 2 * 4, the back should be screws horizontal row row number 42 * 52
Two bearing housings, each bearing block four holes, the hole size is the waist type hole (width 42, length 50, both ends radius is R21, connection bolt approximately is M36)
