Rolling element bearing type per ISO 15. Determines the life exponent p (3 for ball, 10/3 for roller) and X/Y load combination factors per ISO 281.

Bearing designation code (e.g., '6205', '7308B', '22220E'). Looked up in the bearing specs table for dynamic/static load ratings and geometry.

Applied radial load on the bearing in kN. Combined with axial load via X/Y factors to compute equivalent dynamic load P per ISO 281. Typical: 0.5-20 kN for light machinery, 20-200 kN for heavy industrial.

Applied axial (thrust) load on the bearing in kN. For deep groove ball bearings, axial capacity is typically 50-70% of radial capacity. If omitted, defaults to 0.0 (pure radial loading).

Shaft rotational speed in revolutions per minute. Used to convert L10 (millions of revolutions) to L10h (hours). Checked against the bearing's limiting speed. Typical: 500-3600 rpm for motors, 50-500 rpm for gearbox output shafts.

Required survival probability for bearing life calculation. L10 uses 0.90 (90%). Higher reliability (0.95-0.99) reduces calculated life via the a1 adjustment factor per ISO 281. If omitted, defaults to 0.90 (standard L10 life).

Applied shaft torque in N-m. Used with bending moment for minimum shaft diameter sizing via the static-yield distortion-energy criterion (von Mises). If omitted, shaft sizing is skipped unless bending_moment_Nm is provided.

Applied bending moment at the critical shaft section in N-m. Combined with torque for shaft sizing. Typically from bearing reaction forces times moment arm. If omitted, shaft sizing is skipped unless torque_Nm is provided.

Shaft material yield strength in MPa. Used for static shaft sizing. Typical: 350 MPa (1045 CD steel), 530 MPa (4140 QT), 250 MPa (1020 HR). If omitted, defaults to 350 MPa (1045 CD steel).

Design safety factor for shaft sizing. Applied to the von Mises equivalent stress. Typical: 1.5-2.0 for static, 2.5-4.0 for fatigue-critical shafts. If omitted, defaults to 2.0.