Description
Mast guide ball bearing (used in forklift masts & material‑handling equipment)
MG309DDB Bearing – Key Specifications
Bore (Inner Diameter):
45 mm (common spec from Tritan, Lily Bearing, Emerson)
Also listed as 1.8125″ (1-13/16″) in BCA’s spec
Outer Diameter:
5.0025″ (≈127 mm)





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