FAGI DAC 34-64-37 Angular Contact Bearing
The FAGI DAC 346437 (also referenced under industry standard designation DAC 34640037, with dimensions of 34 mm bore, 64 mm outer diameter, and 37 mm total width) represents a first-generation (GEN-1) automotive wheel bearing unit. This compact assembly incorporates two rows of high-grade rolling balls within a single, solid outer ring and a two-piece split inner ring. The contact angle lines diverge toward the outer raceway in a Back-to-Back (DB) arrangement, significantly expanding the effective bearing span ($a_0$) and delivering superior angular rigidity against suspension overturning moments during aggressive cornering.
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Product Detail
Technical Specifications & Engineering Review: FAGI DAC 346437 (34x64x37 mm) Double-Row Angular Contact Wheel Hub Bearing GEN-1 Automotive Wheel Bearing | 34x64x37 mm Dimensions | Dual Contact Rubber Seals (2RS) & Split Inner Ring Design
Manufactured from ultra-clean, through-hardened 100Cr6 chrome bearing steel (AISI 52100). Engineered as a double-row angular contact ball bearing in a Back-to-Back (DB) configuration to simultaneously absorb tilting moment loads, dynamic heavy radial loads, and bidirectional thrust vectors across passenger vehicle front and rear wheel hubs (including Pride, Tiba, Saina, Quik, and Matiz platforms).
Engineering Architecture & Kinematic Performance
The FAGI DAC 346437 (also referenced under industry standard designation DAC 34640037, with dimensions of 34 mm bore, 64 mm outer diameter, and 37 mm total width) represents a first-generation (GEN-1) automotive wheel bearing unit. This compact assembly incorporates two rows of high-grade rolling balls within a single, solid outer ring and a two-piece split inner ring. The contact angle lines diverge toward the outer raceway in a Back-to-Back (DB) arrangement, significantly expanding the effective bearing span ($a_0$) and delivering superior angular rigidity against suspension overturning moments during aggressive cornering.
The precision-ground two-piece inner ring is matched so that the factory-calculated internal radial clearance and preload are automatically achieved once the hub spindle nut is torqued to OEM specifications. Heavy-duty steel-reinforced nitrile contact seals (NBR/HNBR) provide an impervious barrier against pressurized road wash, salt, abrasive dust, and moisture while preventing lubricant washout throughout the operational service life of the bearing.
Designation & Architectural Breakdown
Designates a specialized double-row angular contact automotive wheel bearing optimized for combined radial and bidirectional thrust forces.
Identifies standard metric boundary dimensions: 34 mm inner diameter (d), 64 mm outer diameter (D), and 37 mm width (B).
Facilitates high ball complement packing for high dynamic capacity; exact running preload is locked via drive-axle nut torque.
Engineered multi-lip elastomer profile prevents ingress of external road contaminants and prevents high-speed centrifugal grease ejection.
Lightweight polymer cage minimizes rotational inertia, dampens vibration, and operates quietly at high wheel speeds.
Dimensional, Mechanical & Material Specifications
| Engineering Parameter | Nominal Specification | Functional Mechanical Impact |
|---|---|---|
| Bore Diameter (d) | 34.000 mm | Precision fit on the drive wheel hub spindle, preventing micro-fretting and radial play. |
| Outer Diameter (D) | 64.000 mm | Direct press-fit interference inside the steering knuckle housing bore. |
| Total Width (B) | 37.000 mm | Standard envelope matched for positive axial retention via external circlip rings. |
| Ring & Ball Material | 100Cr6 High-Carbon Chrome Steel (AISI 52100) | Through-hardened to 60–64 HRC for high resistance to rolling contact fatigue (RCF) and road impact brinelling. |
| Initial Lubrication Fill | High-Performance Lithium Complex / Polyurea EP Grease | Maintains elastohydrodynamic film across operating temperatures from -30°C to +150°C during heavy braking. |
| Precision Class | ISO Normal / ABEC-3 (P6 Grade Runout) | Minimizes radial and axial runout, eliminating steering vibrations and brake pedal pulsation. |
Engineering Advantages of FAGI DAC 346437
1. High Moment Rigidity & Cornering Stability
The Back-to-Back angular contact geometry creates a wide effective spread between pressure centers, resisting severe lateral overturning moments and delivering sharp, predictable vehicle handling.
2. Sealed & Maintenance-Free Operation
Pre-greased with a factory-calibrated volume of extreme-pressure lubricant and sealed with dual contact barriers, eliminating the need for periodic re-greasing or clearance adjustments.
3. Superfinished Raceways & Lower Friction
Raceway surface roughness ($Ra \le 0.1\,\mu\text{m}$) reduces rotational drag, minimizes operating temperature rise at high speeds, and supports overall vehicle fuel efficiency.
4. Smooth, Quiet Rotation Without Whining Noise
High-sphericity steel balls and tight geometric tolerances eliminate harmonic vibration, preventing high-speed hum and humming noise across highway cruising conditions.
Target Automotive Platforms & Applications
- Pride Family (Saba, 131, 132, 111, 141, and 151 Pickups): Primary front wheel hub bearing unit designed for severe urban road shock endurance.
- Tiba 1, Tiba 2, Saina, and Quik: Front wheel spindle positions on models utilizing the 34x64x37 mm specification.
- Daewoo Matiz & MVM 110: Front hub assemblies on lightweight compact city car platforms.
- Specialized Light Industrial Drive Shafts: High-rigidity support for 34 mm shafts subject to coupled radial and reversing thrust loads.
Assembly Guidelines & Critical Workshop Warnings
1. When pressing the bearing into the steering knuckle, force must be applied STRICTLY to the OUTER RING face. Applying pressing force to the inner ring transmits the load through the rolling balls, producing brinelling indents on raceways and immediate whining noise after assembly.
2. When pressing the wheel hub into the bearing, support MUST be placed directly against the INNER RING face to prevent separating the two inner ring halves.
- Calibrated Torque Wrench Mandatory: Always torque the CV axle spindle nut to the vehicle manufacturer’s specified setting (typically 150 to 220 N·m depending on platform). Over-torquing with uncontrolled pneumatic impact wrenches crushes the split inner rings, destroys operating clearance, and leads to bearing seizure. Under-torquing causes loose play, wheel wobble, and rapid seal destruction.
- No Hammering: Never strike the bearing directly with steel hammers or punches. The polyamide cages and contact seals are vulnerable to shock impacts.
- Solvent Cleaning Prohibited: The FAGI DAC 346437 is supplied fully pre-greased and sealed. Washing the bearing with gasoline, diesel, or thinners dissolves internal lubrication and ruins elastomer seals.
- Housing Bore Inspection & Circlip Replacement: Clean and inspect the steering knuckle bore for burrs or taper wear prior to mounting, and always install a fresh retaining circlip.
FAGI Quality Assurance & Metallurgical Superiority
Because wheel hub bearings are safety-critical components tied directly to braking stability and steering control, substandard bearings made from non-alloy carbon steels can experience sudden fatigue spalling, excessive hub play, and wheel lockups.
FAGI DAC 346437 wheel bearings are manufactured using vacuum-degassed 100Cr6 chrome alloy steel, precision CNC grinding, and shear-stable grease formulations. This provides high load-carrying security, minimal noise, and extended operational service life under demanding road conditions.
Pricing, Technical Consultation & Bulk Orders
For warehouse availability, technical engineering datasheets, and wholesale inquiries, contact the sales and engineering department at Kamyar Gostar Iranian (KGICO).
Visit & Submit Inquiry: kgico.co