tender for for the supply of lab equipments coupling unit using driving and driven shafts using plumber block bearing unit , lab equipments , coupling unit using driving and driven shafts using plumber block bearing unit i) specifications : ● the plummer block housing material: cast iron (grade fg 200 or equivalent). type: sng or snl series (split -type housing). sealing: felt seals or v -ring seals (to demonstrate lubrication retention). lubrication: provided with a grease nipple at the top center for manual lubrication practice. ● the bearing type: self-aligning ball bearing (1200 series) or spherical roller bearing (22200 series). bore diameter: standard 25mm or 30 mm. ● shafting and coupling shaft material: ground carbon steel (en8 or en9) for high surface finish.