bids are invited for ball bearing (bb1) - bearing 6312zz .skfraceway ring shape: ball; bearing type: double shielded ; inner / outer ring material: steel ;outer ring type: flat; inner dia: d (ø): 60 ; outer dia d (ø): 130 ; precision (jis): grade 0; width b (mm): 31; basic dynamic load rating (n): 82000; max. allowable rotational speed (rpm): 5400 ; specifications / environment:standard; load direction: radial; number of raceway ring rows: single row; size standards: metric system; rolling element material: steel; retainer type: punching; inner / outer ring material: rohs , ball bearing (bb2) - bearing 6213 c3 skf deep groove ball bearings; dimensions:bore diameter (d): 65 mm; outside diamter (d): 120 mm; width (b): 23 mm; shoulder diameter (d1): ˜ 83.3 mm; recess diameter (d2): ˜105.8 mm; chamfer dimension (r1,2); min.1.5 mm; abutment dimensions: diameter of shaft abutment (da): min.74 mm; diameter of housing abutment (da): max.111 mm; radius of shaft or housing fillet (ra): max.1.5 mm; calculation data:basic dynamic load rating (c): 58.5 kn; basic static load rating (c0): 40.5 kn; fatigue load limit (pu): 1.73 kn; reference speed: 12000 r/min; limiting speed: 7500 r/min; minimum load factor (kr): 0.025; calculation factor (f0): 14.7; mass: mass bearing: 1.02 kg; tolerance class- dimensional tolerances: p6; radial run-out: normal; , ball bearing (bb3) - bearing 3213 c3 skf: double row angular contact ball bearing; weight: 1,687 kg; width (mm): 38.1; bearing play:c3; outside diameter (mm): 120; inside diameter (mm): 65 , ball bearing (bb4) - bearing 6311zz skf - raceway ring shape: ball; bearing type: double shielded; inner/outer ring material: steel; outer ring type: flat; precision (jis): grade 0; inner dia. d(ø): 55; outer dia. d(ø): 120; width b(mm): 29; basic dynamic load rating(n): 71500; max. allowable rotational speed(rpm): 5800; specifications/environment: standard; load direction: radial; precision grade: jis b 1514 0 grade; materials: high carbon chromium