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30308D Metric Tapered Roller Bearing
- Modified Contact Angle (D Suffix): Specifically engineered to bear heavier thrust loads in one direction.
- Robust Core Toughness: Case-hardened raceways resist surface fatigue and spalling under shock loads.
- Separable Design: Outer ring (cup) and inner assembly (cone) mount independently for faster installation.
- Micro-Finished Raceways: Ensures smooth, energy-efficient rotation and reduced vibration.
Technical Data
| Technical Parameter | Metric Value |
| Inner Bore Diameter (d) | 40.00 mm |
| Outer Diameter (D) | 90.00 mm |
| Total Width (T) | 25.25 mm |
| Precision Standard | ISO P0 / ABEC-1 |
Product Specifications
| Specification | Details |
| Item Type | Modified Metric Tapered Roller Bearing |
| Model Number | 30308D |
| Bearing Design | Single Row Tapered |
| Material | Vacuum-Degassed GCr15 Chrome Steel |
| Cage Material | Heavy-Duty Stamped Steel |
Product Introduction
The 30308D is a high-capacity metric tapered roller bearing engineered to withstand rigorous industrial operating conditions. Sized at 40 x 90 x 25.25 mm, the "D" suffix indicates a steepened contact angle or modified internal geometry, allowing this bearing to accommodate significantly higher axial thrust forces than standard 30308 series variants. Manufactured from ultra-pure bearing steel and honed to exacting tolerances, it provides exceptional shaft alignment and low frictional torque for heavy commercial vehicle axles and demanding mechanical drives.
Applications
Commercial truck and trailer wheel hubs.
Heavy-duty industrial speed reducers and pinions.
Construction and mining equipment gear transmissions.
FAQ
Q: How does the 30308D differ from a standard 30308?
A: While the basic dimensions (40x90mm) are similar, the "D" suffix signifies an increased contact angle, which slightly alters the total width (25.25mm) and greatly increases axial load ratings.
Q: Is this bearing supplied pre-greased?
A: It comes coated in protective anti-rust oil. Operators should pack it with grease or install it in an oil-bath system before operation.
OEM & Custom Service
We offer global B2B clients tailored services including custom part laser etching, specific internal radial clearance settings, and private-label packaging options.
Packing & Delivery
Protected with specialized low-viscosity rust preventatives, hermetically sealed in heavy foil, and secured in export master cartons.
