🔩 Centre Flange / C Flange – Leyland / Tata L/L 2518 / 3518 / 3723 BS-IV (Serrated Diamond Cut)
📌 Product Overview
A serrated (diamond-cut) centre flange designed for heavy-duty truck drivelines, used in Leyland / Tata L/L series vehicles — particularly models L/L 2518, 3518, 3723 under BS-IV emission standards. This flange assembly couples the driveshaft to the differential or gearbox and includes an integral oil seal to prevent lubricant leakage and contamination.
⚙️ Key Specifications
Application Models: Leyland / Tata L/L 2518, 3518, 3723 (BS-IV) — medium-to-heavy commercial trucks used for freight, logistics, and haulage.
Type: Centre Coupling / Flange (Serrated — Diamond Cut)
– Serrated face means the contact surface has a textured pattern (“diamond cut” / serrations) to improve mechanical grip and reduce slippage in high torque applications.
Height (Total Flange Thickness): ≈ 82 mm
Included Oil Seal Size: 73 mm (inner bore seal) — this refers to the sealing ring installed inside the flange to retain lubricant and prevent external contamination.
Configuration:
– Serrated / Diamond cut coupling surface for better engagement with the mating propeller shaft or yoke.
– Bolt holes / spline interface matched to OEM Leyland / Tata driveline specifications (ensures proper alignment and torque transfer). Typical centre flanges of this type have multiple bolt holes and splines, though exact counts vary by exact OEM part.
🛠️ Function & Benefits
✔ Mechanical Coupling:
Connects the propeller shaft to the differential input / gearbox output securely, transferring rotational torque while accommodating misalignment.
✔ Serrated / Diamond Cut Face:
Improved mechanical engagement via serrations — offers higher friction grip than smooth flanges.
Helps reduce driveline vibration, slip, or micro-movement under heavy load.
✔ Integrated Oil Seal (73 mm):
Prevents lubricant leakage from the driveline housing.
Protects bearings and joints from dirt, dust, and water ingress, extending service life.
🚛 Where It Fits
This coupling flange sits typically at the centre section of a driveshaft assembly or between the propeller shaft and differential / gearbox flange, depending on the vehicle’s driveline layout. It’s a critical component in trucks where long-distance reliability is required.
🔧 Installation Notes
Ensure flange mating surfaces and shaft splines are clean and free from damage before installation.
The oil seal must be oriented correctly (lip towards lubricant side).
Tighten bolts to manufacturer torque specifications to avoid vibration or premature wear.