DKFL 13687/21 Tapered Roller Bearing
The DKFL 13687/21 tapered roller bearing set—consisting of the inner cone 13687 and the matching outer cup 13621—is a high-precision inch-series assembly featuring a 1.5000 in (38.100 mm) inner diameter, a 2.7170 in (69.012 mm) outer diameter, and a combined total assembled width of 0.7500 in (19.050 mm). Due to the modified line contact geometry between the tapered rollers and raceways, this bearing provides exceptional structural stability and an outstanding capacity to handle heavy dynamic radial forces combined with unidirectional thrust loads.
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Product Detail
Technical Engineering Review: Tapered Roller Bearing DKFL 13687/21 (38.1 x 69.012 x 19.05 mm) Single-Row Inch Series Tapered Roller Bearing Assembly (Cone 13687 / Cup 13621) for Heavy Combined Dynamic Loads
Engineered from through-hardened 100Cr6 bearing steel to sustain severe simultaneous radial and unidirectional thrust loads.
Engineering Overview: DKFL 13687/21 (13687/13621) Tapered Roller Bearing
The DKFL 13687/21 tapered roller bearing set—consisting of the inner cone 13687 and the matching outer cup 13621—is a high-precision inch-series assembly featuring a 1.5000 in (38.100 mm) inner diameter, a 2.7170 in (69.012 mm) outer diameter, and a combined total assembled width of 0.7500 in (19.050 mm). Due to the modified line contact geometry between the tapered rollers and raceways, this bearing provides exceptional structural stability and an outstanding capacity to handle heavy dynamic radial forces combined with unidirectional thrust loads.
The geometric design ensures that the projection lines of the raceways converge at a common point on the rotational axis. This design principle eliminates differential sliding, minimizes operating friction, and prevents power losses during continuous rotation. Manufactured under strict quality benchmarks using high-purity alloyed bearing steel with customized heat treatment, the DKFL 13687/21 delivers extended fatigue life under rigorous industrial operating conditions. This product is officially distributed with guaranteed authenticity by Kamyar Gostar Iranian (KGICO).
Technical Anatomy & Designation Breakdown: DKFL 13687/21
Consists of the precision inner ring (38.1 mm bore), pressed steel cage, and a complemented row of super-finished tapered rollers mounted onto the shaft.
Separable precision outer raceway (69.012 mm OD) pressed directly into the housing seat, making independent mounting and clearance setting straightforward.
Standardized ABMA/ANSI footprint widely utilized in commercial vehicle hubs, planetary drives, reduction boxes, and heavy industrial drivelines.
Allows fine-tuning of axial end-play or the introduction of a controlled internal preload in paired configurations to maximize shaft rigidity.
Dimensional, Dynamic & Metallurgical Specifications
| Engineering Parameter | Value (Metric / Imperial) | Functional Significance |
|---|---|---|
| Bore Diameter (d) | 38.100 mm (1.5000 in) | Precision ground inner ring for controlled press-fit mounting on industrial shafts and vehicle spindles |
| Outside Diameter (D) | 69.012 mm (2.7170 in) | Standardized cup dimension ensuring exact seating inside commercial wheel hubs and gear enclosures |
| Total Assembled Width (T) | 19.050 mm (0.7500 in) | Total overall assembly width delivering balanced load capacity within a compact envelope |
| Cone Width (B) | 19.050 mm (0.7500 in) | Precision-ground guide rib profile to minimize friction and thermal build-up at the roller ends |
| Cup Width (C) | 14.288 mm (0.5625 in) | Engineered raceway angle for uniform radial-to-axial stress transfer through the housing body |
| Material (Rings & Rollers) | 100Cr6 High-Carbon Chromium Steel | Through-hardened to 60–64 HRC for high wear resistance and extended rolling contact fatigue life |
| Cage Assembly | Stamped Sheet Steel | Maintains precise roller separation and alignment under rapid acceleration and vibration |
Key Engineering & Competitive Advantages of DKFL 13687/21
1. Superior Shock-Load Capacity
The modified line contact profile between the tapered rollers and raceways eliminates edge stresses, providing dependable resilience against sudden shock loading and high dynamic forces.
2. Separable Design for Seamless Mounting
Because the cone and cup can be mounted independently, installation procedures are simplified, significantly reducing assembly cycle times and eliminating the risk of brinelling during fitment.
3. Rigid Shaft Guiding & Preload Control
When mounted in back-to-back or face-to-face configurations, internal clearances can be precisely dialed in, delivering optimal angular stiffness and high running accuracy.
4. Super-Finished Contact Surfaces
DKFL’s surface finishing minimizes frictional torque during initial running-in, prevents micro-welding at the large rib contact points, and helps maintain lower operational temperatures.
Primary Industrial & Automotive Applications
- Commercial Vehicle Wheel Hubs & Spindles: Supports combined deadweight loads and lateral cornering forces with stability.
- Automotive Differentials & Pinion Shafts: Maintains exact gear meshing under heavy unidirectional and reversing drive thrusts.
- Agricultural Machinery & Off-Highway Equipment: Built to withstand severe external shocks, vibration, and dusty off-road conditions.
- Industrial Gearboxes & Speed Reducers: Ideal for shaft support in Back-to-Back (DB) or Face-to-Face (DF) pairings.
- Mining Conveyor Pulleys & Heavy-Duty Material Handling: Reliable 24/7 continuous operation under high rotational loads.
Engineering Mounting, Preload Setting & Lubrication Guidelines
Single-row tapered roller bearings must always be adjusted against a second bearing. Incorrect internal clearance adjustment (either excessive clearance or excessive preload) leads directly to overheating, accelerated fatigue, and premature assembly seizure.
- Symmetric Press-Fitting of the Cone: When mounting the cone assembly on the shaft, mounting pressure must be applied exclusively to the inner ring face. Never transfer press force through the rollers or cage.
- Perpendicular Cup Seating: Press the outer cup squarely into the housing bore using an appropriate sleeve adapter until it seats flush against the housing shoulder.
- Initial Lubricant Packing: Thoroughly pack the internal roller cavities with high-performance lithium-complex grease containing extreme pressure (EP) additives, or ensure adequate filtered oil circulation in enclosed drivetrains.
- Continuous Rotation During Adjustment: Slowly rotate the shaft by hand or mechanical drive while tightening the locknut or adjusting shims to ensure the tapered rollers seat square against the cone guiding rib.
Guaranteed Authenticity via Kamyar Gostar Iranian (KGICO)
Counterfeit or low-grade tapered bearings are prone to premature brinelling, incorrect raceway angles, and surface flaking, which quickly results in wheel wobble and catastrophic gear misalignment. Specifying authentic DKFL 13687/21 bearings ensures structural durability, low operational noise, and reliable service life.
Kamyar Gostar Iranian (KGICO), under the management of Mr. Kazem Edalati and backed by official exclusive certification G_99260, is the sole authorized distributor of DKFL brand bearings in Iran. KGICO provides industrial buyers with verified metallurgical standards, full factory warranties, technical engineering consultation, and prompt supply from local stock.
Inquire for Technical Pricing, Volume Supply & Availability
Contact our engineering sales department for volume quotations, official proforma invoices, and mechanical application assistance.
Visit the Official KGICO Web Portal: kgico.co