DKFL 5207 2RS C3 Angular Contact Bearing
The 5207 2RS C3 bearing from the authentic DKFL brand is an indispensable component in industrial rotating machinery exposed to high mechanical stress and thermal fluctuations. Functionally, double-row angular contact ball bearings correspond to a matched pair of single-row angular contact ball bearings arranged in a back-to-back (DB) configuration, but integrated into a compact single unit with an overall width of 27 mm.
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Technical & Engineering Review: DKFL 5207 2RS C3 (35x72x27 mm) Double-Row Angular Contact Ball Bearing with Dual Contact Rubber Seals & Elevated C3 Thermal Clearance
Engineered to German manufacturing standards for heavy bidirectional combined loads, high-pressure pumps, and industrial gearboxes
Introduction to DKFL 5207 2RS C3 Double-Row Angular Contact Bearing
The 5207 2RS C3 bearing from the authentic DKFL brand is an indispensable component in industrial rotating machinery exposed to high mechanical stress and thermal fluctuations. Functionally, double-row angular contact ball bearings correspond to a matched pair of single-row angular contact ball bearings arranged in a back-to-back (DB) configuration, but integrated into a compact single unit with an overall width of 27 mm.
The engineering combination of dual heavy-duty elastomer contact seals (2RS) and greater-than-normal internal clearance (C3) makes this bearing an exceptional choice for environments contaminated with dust and moisture, as well as operations involving high operating temperatures. Manufactured under strict German engineering standards from premium ultra-clean 100Cr6 bearing steel, this product is exclusively distributed by Kamyar Gostar Iranian Co. (KGICO).
Anatomy of Technical Code & Suffixes: DKFL 5207 2RS C3
Equivalent to European standard series 32xx; designates a double-row angular contact bearing capable of supporting bidirectional axial loads and overturning moment forces.
Standard metric shaft multiplier ($07 \times 5 = 35$ mm); defines a precision ground 35 mm internal bore diameter for standard shaft fits.
Sheet steel-reinforced contact elastomer seals on both sides to retain premium factory grease and provide complete protection against water, slurry, and particulate contamination.
Enlarged internal radial clearance ($C3 > Normal$), compensating for shaft thermal expansion during high-speed, continuous, or elevated temperature operation.
Dimensional, Dynamic & Metallurgical Specifications
| Engineering Parameter | Value & Standard | Functional Advantage |
|---|---|---|
| Bore Diameter (d) | 35 mm | Precision ground to Normal/P6 tolerance for perfect interference seating on shafts |
| Outside Diameter (D) | 72 mm | Engineered fit compatible with standardized DIN pump and motor housings |
| Total Width (B) | 27 mm | Wider dual-track raceway profile provides superior structural rigidity |
| Contact Angle ($\alpha$) | 30° (Divergent Array) | Provides a wide effective load center distance to withstand tilting moments |
| Raceway & Ball Alloy | 100Cr6 High-Carbon Chrome Steel | Martensitic through-hardened to 60–64 HRC for optimal rolling fatigue life |
| Internal Radial Clearance | C3 (Enlarged Internal Fit) | Prevents ball preloading and heat seizure during high-temp industrial cycles |
| Factory Lubrication | Extreme Pressure (EP) Polyurea/Lithium | 100% maintenance-free sealed-for-life design with anti-oxidation properties |
Key Engineering Advantages of DKFL 5207 2RS C3
1. Compact Alternative to Paired Single Bearings
Eliminates the complexity and mounting inaccuracies associated with configuring two single-row 7207 bearings in a back-to-back arrangement. It saves valuable axial space while guaranteeing factory-set axial preload geometry.
2. Thermal Expansion Protection via C3 Clearance
In hot industrial pumping or continuous gear transmission systems, shaft expansion can reduce internal bearing clearance to zero. C3 clearance safely buffers this expansion, preventing parasitic drag, overheating, and motor overcurrent.
3. Robust Contamination Defense (2RS)
Steel-reinforced Nitrile Butadiene Rubber (NBR) seals provide optimal radial lip contact against the inner ring shoulder, locking factory lubricant inside and preventing external fluids, process water, or particulates from penetrating.
4. German Metallurgy & Superfinished Raceways
Vacuum-degassed bearing steel with ultra-fine superfinishing across ball tracks minimizes frictional torque, reduces running noise, suppresses vibration, and substantially extends overall dynamic fatigue life ($L_{10}$).
Primary Industrial Applications
- Centrifugal, Slurry & Booster Pumps: Supports intense axial thrust loads produced by impellers alongside continuous radial loads created by viscous fluid flow.
- Industrial Reduction Gearboxes: Provides rigid, zero-flex support on intermediate shafts subject to reversing directional rotation and shock loads.
- Rotary Screw Compressors & Industrial Blowers: Exceptional endurance against friction-generated thermal build-up under 24/7 operating cycles.
- Packaging, Conveyor & Textile Machinery: Ensures clean, vibration-free, and grease-leak-free performance in automated production lines.
- Agricultural & Grain Processing Plants: Defends against particulate ingress in dust-laden atmospheres handling raw grain, cereals, and animal feeds.
Engineering Mounting & Handling Guidelines
The 2RS unit is pre-greased with an engineered fill volume. Never remove the rubber seals, inject incompatible grease, or clean the assembly with volatile solvents.
- Correct Press-Fit Protocol (Cold Mounting): Always apply pressing forces exclusively against the ring having the interference fit (inner ring when mounting onto a shaft, outer ring when mounting into a housing bore). Never transmit mounting force through the rolling elements.
- Induction Heating (Hot Mounting): If thermal mounting is required for heavy shaft fits, use an induction bearing heater. Never use an open flame torch. Limit the heating temperature to a maximum of 100°C (212°F) to prevent thermal degradation of the elastomeric 2RS seals and factory grease.
- No Additional Grease Required: The internal cavity is calibrated for speed factor and heat dissipation. Adding excess grease will cause churning, rapid heat buildup, and premature thermal failure.
- Shaft & Housing Alignment: Double-row angular contact ball bearings are sensitive to angular misalignment. Ensure that shaft centers and housing bores are machined within precise concentricity limits.
Guaranteed Authenticity via Kamyar Gostar Iranian (KGICO)
Angular contact bearings play a critical role in preventing machine downtime and shaft deflection. Given the prevalence of sub-standard and counterfeit bearings lacking genuine C3 clearance and certified alloy compositions, sourcing genuine DKFL 5207 2RS C3 components is vital for operational reliability.
Kamyar Gostar Iranian Co. (KGICO), managed by Mr. Kazem Edalati, holds the exclusive authorized distribution rights for DKFL under international Certificate No. G_99260. KGICO guarantees 100% authentic metallurgical provenance, standard pricing, and full technical warranty documentation.
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Contact KGICO central headquarters for bulk plant procurement, formal proforma quotations, and engineering consultation.
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