BT4-0021 G/HA1 Bearing

 

d	206.375 mm	Bore diameter
D	282.575 mm	Outside diameter
B	190.5 mm	Total bearing width over inner rings
T	190.5 mm	Total bearing width over outer rings
d1	≈221 mm	Abutment diameter shaft
D1	≈248 mm	Abutment diameter housing
r1,2	min.0.8 mm	Chamfer dimension inner ring
r3,4	min.3.3 mm	Outer ring radius (chamfer)

Basic dynamic load rating	C	1 400 kN
Basic static load rating	C0	3 350 kN
Fatigue load limit	Pu	305 kN
Comparative radial load rating	CF	340 kN
Comparative axial load rating	CFa	85.2 kN
Thrust factor	K	1.15
Limiting value	e	0.5
Calculation factor	Y1	1.35
Calculation factor	Y2	2
Calculation factor	Y0	1.3

 

The BT4-0021 G/HA1 is a four-row tapered roller bearing, a specialized type designed to handle extremely heavy loads and combined radial and axial forces. Its construction involves four rows of tapered rollers, each positioned between inner and outer rings with matching tapered raceways. This multi-row configuration significantly increases the bearing's load-carrying capacity compared to single or double-row designs. The tapered design allows the bearing to accommodate both radial loads (perpendicular to the shaft) and axial loads (parallel to the shaft) simultaneously. The "G/HA1" likely signifies specific internal design features, tolerances, or material specifications relevant to the manufacturer.

The primary advantage of a four-row tapered roller bearing like the BT4-0021 G/HA1 is its exceptional load-bearing capacity. This makes it suitable for very demanding applications involving high static and dynamic loads. The ability to handle combined radial and axial forces in both directions is another key benefit, simplifying design considerations and reducing the need for separate bearings to manage different load types. These bearings are also known for their robustness and long service life when properly lubricated and maintained, even under harsh operating conditions.

Applications for BT4-0021 G/HA1 four-row tapered roller bearings are typically found in heavy industrial equipment. Rolling mills in steel production, heavy-duty gearboxes in wind turbines, and large mining machinery like excavators and crushers are common examples. These applications require bearings that can withstand immense forces and operate reliably over extended periods. Their ability to handle shock loads and operate in challenging environments makes them a critical component in ensuring the performance and longevity of such heavy machinery.

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