DKFL 5208 2RS C3 Angular Contact Bearing
The 5208 2RS C3 bearing by the renowned brand DKFL is an essential component designed for heavy-duty 40 mm shaft assemblies in rotating machinery. Kinematically, this bearing matches the performance and load distribution of a paired set of single-row 7208 angular contact bearings configured back-to-back (DB). However, it incorporates all internal raceway geometries, contact angles, and axial preloads into a rigid, unified envelope with an optimized standard width of 30.2 mm.
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Technical & Engineering Review: DKFL 5208 2RS C3 (40x80x30.2 mm) High-Performance Double-Row Angular Contact Ball Bearing with Dual Contact Rubber Seals & Elevated C3 Thermal Clearance
Manufactured under precision German metallurgical standards to accommodate bidirectional axial thrust, tilting moments, and heavy radial loads
Engineering Introduction: DKFL 5208 2RS C3 Double-Row Angular Contact Bearing
The 5208 2RS C3 bearing by the renowned brand DKFL is an essential component designed for heavy-duty 40 mm shaft assemblies in rotating machinery. Kinematically, this bearing matches the performance and load distribution of a paired set of single-row 7208 angular contact bearings configured back-to-back (DB). However, it incorporates all internal raceway geometries, contact angles, and axial preloads into a rigid, unified envelope with an optimized standard width of 30.2 mm.
The synergy of dual steel-reinforced contact elastomer seals (2RS) and expanded internal radial clearance (C3) ensures uninterrupted duty cycles in rotating equipment subjected to combined radial-axial loads, thermal expansion, and ambient contamination. Produced in accordance with DIN/ISO standards using high-purity, vacuum-degassed 100Cr6 bearing steel, this premium product is exclusively supplied by Kamyar Gostar Iranian Co. (KGICO).
Technical Code & Suffix Breakdown: DKFL 5208 2RS C3
Designates a double-row angular contact bearing with divergent load contact lines, engineered to absorb heavy bidirectional axial forces together with simultaneous dynamic radial loads.
Standard shaft multiplier ($08 \times 5 = 40$ mm); represents a precision-ground 40 mm internal bore diameter engineered for tight shaft seats in motors and pumps.
Features sheet steel-reinforced Nitrile Butadiene Rubber (NBR) lip seals on both sides to retain premium synthetic grease and deliver an impermeable barrier against dust, moisture, and abrasive contaminants.
Expanded internal clearance ($C3 > Normal$); compensates for thermal shaft elongation and radial expansion under continuous high-temperature duties, preventing rolling-element pinching.
Dimensional, Dynamic & Metallurgical Specifications
| Engineering Parameter | Value & Standard | Functional Significance & Advantage |
|---|---|---|
| Bore Diameter (d) | 40 mm | Ground to DIN 620 Normal/P6 precision tolerances for accurate interference fits on drive shafts |
| Outside Diameter (D) | 80 mm | Engineered for seamless installation into standardized cast iron and cast steel bearing housings |
| Total Width (B) | 30.2 mm | Wide double-row raceway geometry provides unmatched structural rigidity against bending deflection |
| Contact Angle ($\alpha$) | 30° (Divergent Array) | Maximizes effective distance between load centers to securely resist overturning moment loads |
| Raceway & Element Alloy | 100Cr6 High-Carbon Chrome Steel | Through-hardened to 60–64 HRC for elevated rolling contact fatigue life and resistance to spalling |
| Internal Radial Clearance | C3 (Expanded Internal Clearance) | Eliminates parasitic preloads and thermal seizure caused by shaft expansion at elevated temperatures |
| Internal Lubrication | Extreme Pressure (EP) Lithium/Polyurea | 100% sealed-for-life, maintenance-free operation across temperature ranges from -30°C to +120°C |
Engineering Advantages & Competitive Strengths of DKFL 5208 2RS C3
1. Superior Rigidity & Moment Load Capacity
The divergent contact line arrangement in the 5208 series widens the effective load support base. This provides remarkable stability against overturning moment loads, shaft deflection, and heavy overhung belt or gear forces.
2. High-Temperature Security via C3 Clearance
High-temperature media in industrial pumps and frictional heat generated in heavy gearboxes cause substantial shaft expansion. C3 clearance safeguards the bearing against thermal pinching, reducing drag and protecting drive motor efficiency.
3. Advanced 2RS Dual-Lip Sealing
High-grade synthetic rubber seals with steel stiffeners retain grease even under high centrifugal forces, while providing an absolute protective barrier against washdown liquids, ambient humidity, and particulate ingress.
4. Superfinished Raceways & Ultra-Quiet Running
Precision micro-honed and superfinished ball tracks dramatically reduce rolling friction, eliminate running noise and vibration, and ensure maximum operational life ($L_{10}$) under severe service conditions.
Primary Industrial Applications
- Multistage, Centrifugal & Slurry Pumps: Carries heavy axial thrust from impellers along with viscous radial forces without axial play.
- Industrial Helical, Bevel & Worm Gearboxes: Provides rigid intermediate shaft positioning capable of handling shock loads and bidirectional rotational reversals.
- Screw Compressors, Chillers & Roots Blowers: Delivers long-term endurance in continuous 24/7 operating cycles characterized by high thermal loads.
- Heavy-Duty Electric Motors & Generators: Keeps 40 mm rotor shafts perfectly centered, minimizing magnetic pull eccentricity and startup amperage draw.
- Steel Rolling Lines, Mining Screens & Conveyor Drives: Endures harsh abrasive dust, continuous vibration, and washdown environments thanks to the 2RS seals.
Engineering Mounting & Handling Guidelines
The 2RS unit is factory-lubricated with a precise volume of high-performance grease. Never dismantle the rubber seals, inject foreign greases, or wash the bearing with solvents or diesel fuels.
- Hydraulic / Mechanical Press-Fitting: When installing onto a 40 mm shaft, apply pressing force solely to the inner ring face via a dedicated mounting sleeve. Never transmit pressing forces through the rolling elements or outer ring, as this will indent the raceways (true Brinelling) and cause premature failure.
- Thermal Expansion Mounting (Induction Heaters): If hot-mounting is required, always use a temperature-controlled induction bearing heater. Never use an open torch flame. Keep heating temperatures strictly below 100°C (212°F) to avoid damaging the elastomer contact seals and degrading the grease formulation.
- Shaft & Housing Tolerance Verification: Recommended shaft seat tolerances are generally k5 or m5, with H7 housing bore limits. Concentricity must be strictly maintained, as angular misalignment significantly accelerates raceway wear on double-row bearings.
- Zero Relubrication Needed: Classified as a "Sealed-for-Life" bearing; relubrication ports or grease fittings on the housing should be blanked off.
Guaranteed Authenticity via Kamyar Gostar Iranian (KGICO)
Because 40 mm shafts carry critical rotating components across production plants, the installation of substandard or counterfeit bearings lacking certified C3 clearance inevitably results in shaft seizure, unplanned downtime, and catastrophic motor burnouts. Purchasing authentic DKFL 5208 2RS C3 bearings guarantees long-term operational uptime and peak mechanical efficiency.
Kamyar Gostar Iranian Co. (KGICO), directed by Mr. Kazem Edalati, is the sole authorized representative for DKFL under international Certificate No. G_99260. KGICO guarantees 100% metallurgical authenticity, verified material certifications, competitive official pricing, and dedicated engineering consultation for industrial consumers nationwide.
Inquire for Price, Stock Availability & Bulk Orders for DKFL 5208 2RS C3
Contact KGICO central headquarters for bulk procurement, formal commercial proformas, and mechanical engineering consultation.
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