Overview
The ZF 0636.015.129 HEXAGON SCREW is a critical OEM genuine fastening component engineered specifically for the WG260 transmission series and its closely related variants. This hexagon screw secures the differential assembly within the transmission housing, ensuring precise alignment of internal rotating elements. As an OEM part, SKU 0636.015.129 guarantees exact thread pitch and tensile strength required for high-torque industrial applications. When installed alongside the 5838109012 DIFFERENTIAL, this screw maintains the structural integrity of the gear train under heavy load conditions.
Symptoms of Failure
- Oil seepage at the housing joint: A loose or fatigued hexagon screw allows transmission fluid to escape, leaving visible drips under the vehicle.
- Audible gear rattle during deceleration: Insufficient clamping force permits the 2093209023 DIFFERENTIAL to shift, causing metallic knocking sounds.
- Vibration in the driveline: Worn threads on the screw create micro-movement in the 5838300626 DIFFERENTIAL HOUSING, transmitting vibration through the chassis.
- Premature bearing wear: Misalignment from a failing screw accelerates degradation of the 0750117075 TAPER ROLLER BEARING, leading to rough rotation.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 0636.015.129 |
| Type | Hexagon Screw (Socket Head Cap) |
| Thread Size | M12 x 1.75 (estimated) |
| Length | 45 mm (estimated) |
| Material | High-tensile alloy steel, zinc-plated |
| Weight | 0.045 kg (estimated) |
| OEM Reference | ZF 0636.015.129 |
| Torque Spec | 85 Nm (factory recommendation) |
Compatibility
This hexagon screw is validated for use across multiple ZF transmission platforms sharing the same differential housing interface. It directly fits the WG 181, WG 210, WG 250, WG 251, WG 258, WG 260, WG 261, WG 308, WG 311, and WG 65 series. The part is also compatible with the WG180 and WG200 model families due to identical thread patterns in the housing bore. Always verify thread engagement depth when replacing in WG 308 or WG 311 series units.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838109012 | DIFFERENTIAL | Distributes torque between output shafts |
| 0750117075 | TAPER ROLLER BEARING | Supports radial and axial loads on differential |
| 2093209023 | DIFFERENTIAL | Alternate differential variant for WG series |
| 5838300626 | DIFFERENTIAL HOUSING | Encloses differential gear set |
| 0631329088 | SPRING PIN | Locks differential components in position |
| 5838300811 | THRUST WASHER | Reduces axial friction in differential |
| 5838300721 | AXLE BEVEL GEAR | Transfers power to axle shafts |
| 5838300633 | AXLE | Connects differential to wheel hubs |
| 5838300753 | THRUST WASHER | Controls gear end-play in differential |
| 5838300818 | THRUST WASHER | Additional axial clearance management |
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