🔩 Centre Coupling Flange – TATA 2515 / 2518 (Serrated, 85 mm Height)
📌 Component Overview
The centre coupling flange (sometimes listed as centre joint coupling flange or through‑shaft coupling) is a driveline component used on heavy commercial trucks where the propeller shaft is in two sections (“thru shaft”). It sits at the middle of the driveline and connects the front and rear propeller shaft halves via a serrated / splined interface that ensures positive torque transmission and smooth rotational continuity.
This part is particularly used on TATA 2515 and 2518 series trucks, which often have a centre bearing and multi‑piece shaft due to their longer wheelbase and heavy payload requirements.
⚙️ Typical Specifications
| Feature | Specification |
|---|---|
| Application | TATA 2515, TATA 2518 with thru (multi‑piece) propeller shaft |
| Part Type | Centre Coupling Flange (Serrated) |
| Plate Diameter | ~150 mm (6″ class) |
| Spline Count | ~34 splines (serrated torque surface) |
| Bolt Holes | 4 holes (common mounting pattern) |
| Height / Thickness | ~85 mm total height (axial) |
| Bolt Size | ~13 mm class |
| Material | High‑strength steel (typically heat‑treated) |
| Surface Type | Serrated (positive engagement with mating yoke flange) |
In the KKI Autos Propeller Shaft catalogue, a Centre Coup. TATA 2518 (serrated) appears with part references showing a 150 mm plate and 85 mm height suited for thru‑shaft propeller assemblies.
🛠️ Function & Role in the Vehicle
✔ Torque Transmission:
The centre coupling flange carries rotational torque from the gearbox through the front shaft segment into the rear shaft segment. Its serrated/splined surface ensures a firm, slip‑resistant connection under load.
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