FAGI 69349/10 apered Roller Bearing
The FAGI 69349/10 (standard designation LM69349/LM69310) is a single-row imperial tapered roller bearing engineered with an inner diameter (bore) of 38.000 mm (1.4961 in), an outer diameter of 63.000 mm (2.4803 in), and an assembled total width of 17.000 mm (0.6693 in). Its geometric architecture ensures that the apexes of the tapered raceways on the inner and outer rings, as well as the tapered roller profiles, converge at a single common point on the rotational axis. This geometric precision produces pure rolling contact, virtually eliminating skidding and minimizing frictional torque during operation.
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Product Detail
Technical Specifications & Engineering Review: FAGI Inch Tapered Roller Bearing LM69349/10 (69349/10) Standard Dimensions: 38x63x17 mm (1.4961x2.4803x0.6693 in) | Complete Cone & Cup Assembly | Single-Row Separable Design
Manufactured from high-purity, through-hardened 100Cr6 bearing steel (AISI 52100). Engineered to accommodate severe combined loads (simultaneous heavy radial and single-direction axial forces), delivering exceptional rigidity and reliable long-term performance in automotive wheel hubs, industrial pinion shafts, differentials, and agricultural equipment.
Engineering Architecture & Kinematic Design
The FAGI 69349/10 (standard designation LM69349/LM69310) is a single-row imperial tapered roller bearing engineered with an inner diameter (bore) of 38.000 mm (1.4961 in), an outer diameter of 63.000 mm (2.4803 in), and an assembled total width of 17.000 mm (0.6693 in). Its geometric architecture ensures that the apexes of the tapered raceways on the inner and outer rings, as well as the tapered roller profiles, converge at a single common point on the rotational axis. This geometric precision produces pure rolling contact, virtually eliminating skidding and minimizing frictional torque during operation.
The assembly utilizes a separable design comprising two primary components: the Cone assembly (inner ring, stamped steel cage, and precision rollers) and the Cup (outer ring). This separable configuration allows the cup to be pressed into the housing and the cone to be mounted onto the shaft independently. It also provides maintenance teams and system builders with the ability to micro-adjust operational end-play or set precise preloads in opposing Face-to-Face (DF) or Back-to-Back (DB) configurations.
Designation & Code Anatomy Breakdown
Designates the imperial load rating class per ABMA standards, offering an optimal balance between heavy load-carrying capacity and a compact radial envelope.
The 38 mm inner ring sub-assembly with superfinished tapered rolling elements and a precision-formed stamped steel cage for uniform roller retention.
The 63 mm outer ring raceway, precision ground to ensure an accurate contact angle for resolving combined radial and unidirectional axial vectors.
Enables independent press-fitting of cup and cone, simplifying replacement procedures and allowing exact micrometer setting of running clearance.
Features an optimized contact profile to eliminate edge stress concentrations, improve hydrodynamic film formation, and maintain lower running temperatures.
Dimensional, Mechanical & Material Specifications
| Technical Parameter | Nominal Dimension (Metric / Imperial) | Functional Mechanical Impact |
|---|---|---|
| Bore Diameter (d) | 38.000 mm / 1.4961 in | Precision fit for vehicle wheel spindles, stub axles, and intermediate gearbox shafts. |
| Outer Diameter (D) | 63.000 mm / 2.4803 in | Direct press-fit seating inside cast iron/aluminum wheel hubs or transmission housings. |
| Total Assembled Width (T) | 17.000 mm / 0.6693 in | Standard assembled axial boundary for exact shimming and spacer stack calculations. |
| Cone Width (B) | 17.000 mm / 0.6693 in | Primary roller contact base providing rotational stability under heavy radial loading. |
| Cup Width (C) | 13.500 mm / 0.5315 in | Rigid seating depth within the housing shoulder without interfering with adjacent seal lips. |
| Ring & Roller Material | 100Cr6 High-Carbon Chrome Steel (AISI 52100) | Through-hardened to 60–64 HRC for high resistance to rolling contact fatigue (RCF) and wear. |
| Cage Construction | Precision Pressed Steel | Maintains exact roller spacing with low inertia and promotes grease circulation. |
Engineering Advantages of FAGI 69349/10
1. Simultaneous Combined Load Capacity
The contact angle of the tapered raceway simultaneously absorbs dynamic radial shock loads and sustained single-direction axial forces encountered during vehicle cornering or gear meshing.
2. Adjustable Preload & Operational Clearance
Due to its paired configuration, technicians can micro-adjust the shaft retention nut torque or shim pack to achieve zero internal clearance, maximizing dynamic shaft rigidity.
3. Superfinished Surfaces & Thermal Control
Ultra-smooth raceway and roller finishes facilitate immediate elastohydrodynamic lubrication (EHL), reducing start-up torque and keeping operating temperatures low under sustained highway speeds.
4. Shock Load & Vibration Resistance
Thermally stabilized 100Cr6 alloy steel withstands intense impact shocks from road irregularities and gearbox cyclic oscillations without micro-spalling or raceway brinelling.
Target Industrial & Automotive Applications
- Automotive & Trailer Wheel Hubs: Provides smooth wheel rotation while bearing heavy vehicle weights and handling dynamic lateral forces during cornering.
- Differentials & Pinion Shafts (Light Trucks, Vans & Forklifts): Maintains precise pinion-to-crown gear meshing alignment with zero axial play.
- Industrial Worm & Bevel Gear Reducers: Absorbs severe thrust loads generated along high-speed countershafts and intermediate gear stages.
- Agricultural Machinery (Tractors, Combines, Disc Harrows): Offers robust resistance to particulate contamination and severe terrain shock loads.
- High-Pressure Centrifugal & Hydraulic Pumps: Maintains rigid shaft stability against continuous hydraulic thrust vectors.
Assembly Guidelines & Critical Workshop Warnings
Unlike deep groove ball bearings, tapered roller bearing 69349/10 does not have a fixed internal clearance. Over-tightening the spindle nut generates excessive preload, causing rapid thermal runaway and bearing seizure within minutes. Conversely, under-tightening leaves excessive clearance, inducing wheel wobble, severe vibration, and accelerated gear tooth wear.
- Torque & Seating Protocol: When mounting on a spindle, tighten the nut to the specified initial seating torque while rotating the hub in both directions to ensure proper roller alignment against the cone rib; then back off the nut to the designated clearance setting and lock it securely with a cotter pin or locking plate.
- Press-Fitting Tools: Always use a suitable mechanical or hydraulic press driver that contacts the entire face of the Cup (LM69310). Never strike raceway lips directly with a steel hammer, as this will chip, distort, or crack the hardened steel.
- 100% Grease Packing: The internal cavity between the rollers and the stamped steel cage must be fully packed (using a mechanical packer or manual palm-packing method) with high-temperature NLGI 2 lithium complex wheel bearing grease before mounting; surface smearing alone will cause dry-start damage.
- Matched Replacement (Never Mix New & Used Parts): Always replace both the cone (LM69349) and cup (LM69310) as a complete set. Pairing a new cone with a worn cup results in mismatched contact profiles, uneven load distribution, and premature failure within 100 operating hours.
FAGI Quality Standards & Metallurgical Superiority
Because imperial tapered roller bearings operate in critical driveline and wheel-end applications under continuous contact stress, using substandard components made from low-grade carbon steel can result in catastrophic roller spalling, hub seizure, and severe mechanical failure.
The FAGI 69349/10 tapered roller bearing leverages heat-treated 100Cr6 alloy metallurgy, precision-controlled imperial machining tolerances, and superfinished roller tracks to deliver reliable fatigue resistance, reduced downtime, and extended service intervals.
Pricing, Engineering Consultation & Bulk Orders
For inventory checks, technical data sheets, and commercial orders, contact the sales and technical engineering team at Kamyar Gostar Iranian (KGICO).
Visit & Submit Inquiry: kgico.co