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The 14*50 is a genuine, heavy-duty propeller shaft (drive shaft) fastener kit engineered specifically for BEIBEN trucks, consisting of a high-tensile bolt and a matching self-locking nut. This critical fastening assembly is responsible for securely connecting the driveshaft flange to the companion flange of the transmission, transfer case, or differential. As a premier supplier of reliable Beiben truck parts, we offer the authentic 14*50 bolt and nut kit manufactured to meet exacting original equipment strength and safety standards.
< p>This fastener is subjected to extreme torsional vibration, shear forces, and shock loads during vehicle operation. Made from high-grade alloy steel and often featuring a flanged design or integrated washer, the 14*50 bolt, paired with its prevailing torque nut or nylon-insert lock nut, ensures a vibration-resistant, permanent connection that prevents loosening. The integrity of this small but vital component is fundamental to driveline safety, preventing catastrophic driveshaft detachment and ensuring uninterrupted power transfer from the engine to the wheels in demanding BEIBEN truck applications.
Propeller Shaft Bolt & Nut
Болт и гайка карданного вала
Perno y Tuerca del Eje Cardán
The 14*50 bolt and nut assembly serves the vital role of physically securing the driveshaft to the powertrain. It clamps the mating flanges together, creating a rigid mechanical link that transmits engine torque. This connection must withstand not only constant rotational force but also the shock loads from gear changes, clutch engagement, and road irregularities. The fastener’s clamping force creates friction between the flanges, which is the primary method of torque transfer. A loose or failed 14*50 bolt can allow the flange connection to slip, causing severe damage, imbalance, and potentially allowing the driveshaft to detach—a dangerous situation. Therefore, this component is a critical safety item in the driveline.
High-Tensile Alloy Steel: The 14*50 bolt is forged from grade 10.9 or higher alloy steel, heat-treated to achieve exceptional tensile strength and yield point, resisting stretching, shearing, and fatigue under dynamic loads.
Flanged Bolt Head Design: Often features an integrated, wide flange that acts as a built-in washer, distributing the clamping force over a larger area to prevent damage to the softer flange material and improve joint stability.
Self-Locking Nut Technology: The matching nut incorporates a prevailing torque feature, such as a nylon collar, deformed threads, or a center-pin lock, which creates constant friction to resist loosening from vibration, eliminating the need for separate lock washers.
Corrosion-Resistant Finish: Typically coated with a yellow zinc dichromate or similar protective plating that provides excellent resistance to rust and corrosion, ensuring consistent torque values and ease of removal during service.
Precise Dimensional Standard: The “14*50” designation indicates a 14mm diameter and a 50mm length (typically measured under the head), ensuring perfect fit through the flange holes and sufficient thread engagement.
The table below details the fundamental technical parameters for the BEIBEN 14*50 Propeller Shaft Bolt and Nut kit. These specifications are crucial for correct identification and application.
| Parameter | Specification |
|---|---|
| OEM Part Number / Code | 14*50 |
| Component Name | Propeller Shaft Bolt & Nut Kit |
| Brand | BEIBEN |
| Bolt Diameter (Thread) | 14 mm |
| Bolt Length | 50 mm (Under Head) |
| Strength Grade | 10.9 or Higher |
| Nut Type | Self-Locking (Nylon Insert/Prevailing Torque) |
| Primary Application | BEIBEN Driveshaft Flange Connection |
The 14*50 fastener is a quintessential safety-critical component. A driveshaft rotating at high speed stores immense kinetic energy. If a bolt fails and the shaft detaches, it can whip violently, causing extensive damage to the vehicle’s undercarriage, fuel lines, brake lines, and posing a severe hazard to other road users. The self-locking feature of the nut is specifically designed to combat “rotational loosening” induced by vibration, a common cause of joint failure. Using the correct grade and spec, such as the genuine 14*50 kit, ensures the joint’s integrity, maintaining the vehicle’s driveline as a safe, closed system. Regular inspection of these fasteners is a non-negotiable aspect of commercial vehicle maintenance.
Proper installation of the 14*50 bolt and nut is mandatory for a reliable connection. Always use new fasteners when reassembling a critical joint, as the self-locking feature of the nut is typically one-time-use. Clean the bolt holes in the flanges to remove dirt, rust, or old thread locker. Insert the bolt through the aligned flanges. Hand-tighten the nut to ensure free movement. Using a calibrated torque wrench, tighten the nut to the manufacturer’s specified torque value in a crisscross or star pattern if multiple bolts are present. This ensures even clamping force. Do not lubricate the threads unless specified, as this drastically changes the torque-tension relationship. The goal is to achieve precise bolt stretch (preload) to clamp the flanges securely.
Metallic Clunking or Banging: A pronounced clunk during acceleration, deceleration, or gear changes often indicates movement between the flanges due to loose 14*50 bolts.
Increased Driveline Vibration: A new or worsening vibration, especially at specific speeds, can be caused by an imbalanced joint from uneven bolt tightness or a partially sheared bolt.
Leaks from the Flange Seal: Excessive movement can damage the companion flange seal (on differentials or transfer cases), leading to lubricant leaks.
Visible Looseness or Rust Streaks: During inspection, a bolt that can be turned by hand or shows signs of “fretting corrosion” (rust dust around the bolt head) is loose and must be replaced.
Complete Bolt Failure: A missing bolt head, sheared shaft, or stripped threads are clear signs of catastrophic failure requiring immediate repair and full fastener replacement.
Regular inspection of the 14*50 propeller shaft fasteners should be part of every routine maintenance schedule. Visually check all bolts and nuts for signs of corrosion, physical damage, or improper seating. Using a properly sized wrench or socket, check the torque of several fasteners per joint to ensure they are within specification. Look for any signs of movement, such as shiny wear marks on the flange around the bolt head or nut. Listen for any new driveline noises during test drives. It is good practice to replace the entire set of 14*50 bolts and nuts during major driveline service or if any single fastener shows signs of compromise. Never re-use a self-locking nut that has been fully torqued and removed.
Choosing the genuine BEIBEN 14*50 fastener kit is critical for guaranteed performance and safety. Original equipment fasteners are manufactured to precise metallurgical and dimensional standards. The specified grade (e.g., 10.9) ensures the bolt has the exact tensile strength and fatigue resistance required for this high-stress application. The locking mechanism on the nut is also tested and validated to perform under the specific vibration profile of a BEIBEN truck. Generic hardware store bolts of the same nominal size may not have the required strength, correct thread pitch, or any locking feature, creating a severe safety risk. The genuine 14*50 kit is a certified, traceable component that ensures joint reliability.
The “14*50” code is a key identifier for the fastener’s size and application on BEIBEN trucks. However, it is essential to verify the complete specification, including thread pitch (e.g., 1.5mm or 2.0mm) and strength grade. Compatibility is determined by the specific driveshaft and flange design. Always match the new fastener to the old one exactly, checking length, head style, and nut type. Providing your truck’s VIN (Vehicle Identification Number) to your parts supplier is the most reliable method to confirm the 14*50 kit is the correct match for your vehicle’s specific driveline configuration, ensuring a safe and proper fit.
If a clunk or vibration is traced to a flange joint, a systematic check is needed. First, visually inspect all 14*50 bolts for tightness and condition. Check for missing or loose bolts. If bolts are tight but noise persists, the issue may be worn splines inside the flange, a failed universal joint, or excessive backlash in the differential. If bolts are repeatedly loosening, check for damaged flange faces, incorrect bolt length (too short), or the use of non-locking nuts. Always replace fasteners as a complete set for the joint. If the bolt holes in the flange are elongated or damaged, the flange itself must be replaced. Never attempt to repair a damaged joint with oversized bolts or thread-locking compounds alone.
The BEIBEN 14*50 Propeller Shaft Bolt and Nut is a small component with an outsized role in driveline safety and reliability. Its high-strength construction and integrated locking mechanism are specifically designed to maintain a secure flange connection under the most demanding conditions. Recognizing the signs of fastener wear or failure is crucial for preventative maintenance.
Always insist on the genuine 14*50 kit for all replacements. Follow the manufacturer’s torque specifications exactly using calibrated tools. Incorporate visual and torque checks of these fasteners into every major service interval. By giving this critical component the attention it deserves, BEIBEN truck operators and fleet managers can prevent dangerous driveline failures, ensure uninterrupted vehicle operation, and uphold the highest standards of road safety for all.
© 2023 Truck Parts Guide. This content is for informational purposes. Always consult the official BEIBEN service manual and qualified professionals for maintenance and repair procedures.
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