DKFL 30215 Tapered Roller Bearing
The DKFL 30215 is one of the most widely specified metric single-row tapered roller bearings for medium-to-large industrial shafts and commercial axle assemblies. Featuring a precision bore diameter of 75 mm, an outside diameter of 130 mm, and an overall assembled width of 27.25 mm, this bearing is engineered to sustain heavy combined radial and unidirectional thrust loads with minimal elastic deflection.
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Technical Engineering Review: Tapered Roller Bearing DKFL 30215 (75 x 130 x 27.25 mm) Metric Series 302 Single-Row Tapered Roller Bearing for Heavy Dynamic Radial & Unidirectional Thrust Loads
Manufactured from premium through-hardened 100Cr6 bearing steel to provide superior angular rigidity, low friction, and maximum torque transfer in industrial and automotive drivetrains.
Engineering Overview: DKFL 30215 Metric Tapered Roller Bearing
The DKFL 30215 is one of the most widely specified metric single-row tapered roller bearings for medium-to-large industrial shafts and commercial axle assemblies. Featuring a precision bore diameter of 75 mm, an outside diameter of 130 mm, and an overall assembled width of 27.25 mm, this bearing is engineered to sustain heavy combined radial and unidirectional thrust loads with minimal elastic deflection.
Its internal geometry relies on the true rolling principle: the apexes of the tapered surfaces of the inner cone raceway, outer cup raceway, and tapered rollers converge at a common point along the central rotational axis. This design completely eliminates differential sliding during rotation, promoting pure hydrodynamic rolling, low operating temperatures, and maximum mechanical efficiency. Produced from high-purity 100Cr6 bearing steel through-hardened to 60–64 HRC, the DKFL 30215 delivers outstanding resistance to rolling contact fatigue and impact loading. This product is officially distributed across Iran by Kamyar Gostar Iranian (KGICO).
Technical Anatomy & Designation Breakdown: DKFL 30215
Designates standard metric series ISO 355 dimensions offering an optimal balance between radial load rating, axial thrust capacity, and boundary space efficiency.
Standard calculation code ($15 \times 5 = 75\text{ mm}$), identifying precise inner ring fitment tailored for heavy reduction shafts, machine spindles, and axle hubs.
The outer cup is fully separable from the cone assembly (inner ring, cage, and rollers), enabling independent press-fitting and simplified maintenance cycles.
Enables micron-accurate adjustment of axial end-play or calibrated preloading during paired setup, delivering superior shaft rigidity and gear mesh accuracy.
Dimensional, Dynamic & Metallurgical Specifications
| Engineering Parameter | Value (Metric) | Functional Significance |
|---|---|---|
| Bore Diameter (d) | 75 mm | Precision-ground cylindrical bore engineered for tight interference fits on high-load transmission shafts |
| Outside Diameter (D) | 130 mm | Standardized cup profile ensuring rigid, accurate fitment into industrial housings and differentials |
| Total Assembled Width (T) | 27.25 mm | Standard width delivering robust load ratings within an optimized, space-saving axial envelope |
| Inner Ring Width (Cone - B) | 25 mm | Features a mirror-finished cone back-face guide rib to minimize sliding friction and roller-end wear |
| Outer Ring Width (Cup - C) | 22 mm | Engineered raceway angle providing uniform distribution of radial-axial vectors into the housing bore |
| Material (Rings & Rollers) | 100Cr6 High-Carbon Chromium Steel | Through-hardened to 60–64 HRC with superior microstructural cleanliness and wear endurance |
| Cage Assembly | Pressed Sheet Steel (Formed) | Sturdy pocket guidance preventing roller skewing while promoting unrestricted lubricant circulation |
Key Engineering & Competitive Advantages of DKFL 30215
1. Logarithmic Contact Geometry
DKFL's modified logarithmic roller profile prevents stress peaks at the roller ends, ensuring uniform load distribution even under minor shaft deflections or momentary overloads.
2. Separable Design for Seamless Installation
The independent mounting capability of the cone and cup simplifies workshop fitment and automated assembly lines, completely eliminating the danger of brinelling raceways during assembly.
3. Rigid Shaft Guidance & Precision Gear Mesh
By eliminating axial play and applying controlled preload in opposing pairs, the bearing stabilizes shafts under high helical gear reaction forces, preventing premature gear tooth wear.
4. Reduced Running-In Thermal Spikes
Precision super-finishing on the cone large rib and roller heads minimizes hydrodynamic boundary friction during initial start-up, protecting the lubricant film from early thermal degradation.
Primary Industrial & Automotive Applications
- Commercial Vehicle Wheel Hubs & Truck Axles: Reliably supports combined chassis deadweight and dynamic centrifugal cornering forces.
- Helical & Bevel Gear Speed Reducers: Maintains exact shaft alignment against intense continuous axial thrust generated by gear tooth helix angles.
- Heavy-Duty Differentials & Transmission Output Shafts: Delivers vibration-free torque transmission and resists reversing mechanical shock loads.
- Steel Mill Rollout Tables, Conveyor Drums & Mining Pulley Assemblies: Ensures continuous, dependable 24/7 service under contaminated, high-load conditions.
- Heavy Centrifugal Slurry Pumps & Processing Machinery: Withstands aggressive hydraulic axial thrust produced by large fluid impellers.
Critical Engineering Mounting, Preload Setting & Lubrication Guidelines
Single-row tapered roller bearings cannot sustain two-directional thrust loads individually. The DKFL 30215 must always be paired against an opposing bearing (Face-to-Face or Back-to-Back). Accurate internal clearance or preload setting is crucial: excessive clearance creates shaft play and noise, while excessive preload induces thermal runaway and bearing seizure.
- Thermal Mounting via Induction Heating: For press-fit shaft mounting, heat the inner cone assembly uniformly using an induction heater up to 100°C–110°C. Never use open-flame torches, and never apply mechanical impact directly to the cage or rollers.
- Square Cup Insertion: Press the outer cup squarely into the housing seat using a properly sized pilot sleeve that contacts the outer ring face, verifying that it seats tight against the housing locating shoulder.
- Continuous Rotation During Preload Adjustment: Rotate the shaft continuously while torquing the locknut or adjusting shim packs; this allows the tapered rollers to align and seat properly against the cone guiding rib.
- Proper Lubricant Selection: Pack all internal voids between rollers and the cage thoroughly with premium lithium-complex grease containing Extreme Pressure (EP) additives, or maintain clean circulating industrial gear oil (ISO VG 150/220/320).
Guaranteed Authenticity via Kamyar Gostar Iranian (KGICO)
Utilizing substandard or counterfeit tapered roller bearings leads to premature raceway spalling, excessive shaft deflection, gear noise, and sudden machine downtime. Choosing authentic DKFL 30215 guarantees strict dimensional compliance, high alloy purity, and long-term operational peace of mind.
Kamyar Gostar Iranian (KGICO), directed by Mr. Kazem Edalati and holding official exclusive certificate G_99260, is the sole authorized representative for DKFL brand bearings in Iran. KGICO eliminates intermediate distribution layers, guaranteeing genuine stock, verified metallurgical standards, and factory-direct pricing for vehicle manufacturers, rolling mills, cement plants, and engineering workshops nationwide.
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Get in touch with KGICO’s engineering sales division for wholesale quotations, official proforma invoices, and mechanical application assistance.
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