Overview
The ZF 0636.011.326 HEXAGON SCREW is a critical fastening component engineered specifically for the WG260 transmission series and its closely related variants. This OEM genuine part secures key internal assemblies within the gearbox housing, ensuring precise alignment and clamping force under high-torque conditions. The SKU 0636.011.326 is commonly found in the differential mounting area, where it works in conjunction with the 2095109020: DIFFERENTIAL to maintain structural integrity. Without this hexagon screw, the transmission’s internal load paths become unstable, leading to premature wear on adjacent components.
Symptoms of Failure
- Oil seepage around the transmission housing: A loose or fatigued 0636.011.326 screw can compromise the seal between the differential housing and the main case, causing gradual hydraulic fluid loss.
- Abnormal gear whine or clunking during acceleration: When this hexagon screw loses its torque retention, the 0750117075: TAPER ROLLER BEARING may shift out of its preload specification, generating audible noise.
- Increased backlash in the drivetrain: A failing screw allows the 2095209037: DIFFERENTIAL to micro-move under load, creating a noticeable delay between input and output rotation.
- Vibration at highway speeds: Worn threads on the hexagon screw can cause the 2095309059: DIFF.HOUSING to resonate, transmitting vibration through the chassis.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0636.011.326 |
| Type | Hexagon Screw (Socket Head Cap) |
| Thread Size | M10 x 1.5 |
| Length | 45 mm |
| Head Height | 10 mm |
| Material | Alloy Steel, 10.9 Grade |
| Surface Finish | Zinc-Plated (Yellow Passivated) |
| Weight | 0.045 kg |
| OEM Reference | ZF 0636.011.326 |
Compatibility
This hexagon screw is designed for ZF WG-series transmissions, specifically the WG 250, WG 251, WG 258, WG 260, WG 261, WG 308, WG 311, and WG 65 series. It is a direct replacement for the OEM fastener used in the differential carrier assembly. For applications involving the WG180 or WG200 models, verify thread pitch compatibility, as these older series may use a different screw length. The 0636.011.326 is also a common service part for the 2095309081: DIFFERENTIAL AXLE mounting points.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2095109020 | DIFFERENTIAL | Distributes torque between drive wheels |
| 0750117075 | TAPER ROLLER BEARING | Supports axial and radial loads on shafts |
| 2095209037 | DIFFERENTIAL | Secondary differential unit for multi-axle systems |
| 2095309059 | DIFF.HOUSING | Encloses and aligns differential gears |
| 0631329086 | SPRING PIN | Secures shift fork or actuator linkages |
| 0730300820 | THRUST WASHER | Reduces axial friction between rotating parts |
| 4482360002 | AXLE BEVEL GEAR | Transfers power from differential to axle shaft |
| 2095309081 | DIFFERENTIAL AXLE | Connects differential to wheel hub assembly |
| 5838300811 | THRUST WASHER | Prevents gear end-play in differential |
| 4482360001 | DIFFERENTIAL BEVEL GEAR | Drives the side gears within the differential |
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