This bearing unit locates and supports a shaft with a bore diameter (d) of 48 mm, running on an outer element with an outside diameter (D) of 110 mm. The housing height (H) is 70 mm, with the overall dimension H1 at 140 mm and H2 at 23 mm. The mounting base is defined by dimensions A = 365 mm, A1 = 288 mm, J = 150 mm, J1 = 263 mm, L = 190 mm, L1 = 585 mm, L2 = 331 mm, N = 15 mm, V = 70 mm, W = 55 mm, X = 25 mm and b = 60 mm, with a shaft seating diameter (da) of 50 mm — these dimensions should be cross-checked against the catalogue drawing during installation. The housing construction of the BL 50 allows the unit to be bolted to a supporting structure through the mounting holes defined by the A, A1, J and J1 dimensions, giving a fixed-base installation. The bore size of 48 mm sets the shaft fit, while the surrounding housing dimensions determine the envelope needed for the mounting location. As a plummer-block type housing, it is intended to carry the insert bearing and accommodate the shaft alignment allowed by the insert's design; sealing and lubrication depend on the specific insert fitted into the BL 50 housing.