Overview
The ZF 0636.011.265 HEXAGON SCREW is a critical fastening element engineered for the WG260 transmission series and its closely related variants. This OEM genuine part secures key internal assemblies, including the differential housing and bearing retainers, ensuring precise axial clamping force under high-torque conditions. The SKU 0636.011.265 is specifically designed to withstand the vibrational loads and thermal expansion cycles common in heavy-duty industrial transmissions. When paired with a 2093109001: DIFFERENTIAL, this hexagon screw maintains the structural integrity of the gear train, preventing unwanted movement that could lead to misalignment.
Symptoms of Failure
- Transmission oil seepage at the housing joint: A loosened or fatigued hexagon screw can compromise the seal between the differential housing and the main case, leading to visible oil weeping around the bolt flange.
- Audible gear rattle or clunking during load shifts: When the screw loses its torque retention, the 0750117075: TAPER ROLLER BEARING may shift slightly, creating irregular backlash and metallic knocking sounds.
- Increased drivetrain vibration at highway speeds: A fractured or stripped hexagon screw allows the 2093209095: DIFFERENTIAL assembly to oscillate, transmitting harmonic vibrations through the transmission casing.
- Premature wear of the differential housing bore: Without proper screw tension, the 2093309071: DIFF.HOUSING can develop fretting corrosion, accelerating component degradation.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 0636.011.265 |
| Head Type | Hexagon (Hex Head) |
| Thread Size | M12 x 1.75 (estimated) |
| Length | 45 mm (estimated) |
| Material | High-tensile alloy steel, zinc-plated |
| Weight | 0.045 kg (approx.) |
| OEM Reference | ZF 0636.011.265 |
| Grade | 10.9 (estimated) |
Compatibility
This hexagon screw is a direct-fit OEM replacement for the following ZF transmission model series: WG 250 Series, WG 251 Series, WG 258 Series, WG 260 Series, WG 261 Series, WG 308 Series, and WG 311 Series. It is commonly used in the differential mounting area where it interfaces with the 2093109001: DIFFERENTIAL and the 2093309071: DIFF.HOUSING. For WG180 and WG200 series applications, verify thread pitch compatibility before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2093109001 | DIFFERENTIAL | Distributes torque to axle shafts |
| 0750117075 | TAPER ROLLER BEARING | Supports differential rotational loads |
| 2093209095 | DIFFERENTIAL | Alternate differential assembly variant |
| 2093309071 | DIFF.HOUSING | Encloses differential gear set |
| 0631100223 | SPRING PIN | Locks gear positions on shafts |
| 0730300820 | THRUST WASHER | Reduces axial friction in gear stack |
| 4482360002 | AXLE BEVEL GEAR | Transfers power to wheel axles |
| 2097309085 | DIFFERENTIAL AXLE | Connects differential to wheel hub |
| 5838300811 | THRUST WASHER | Spacer for differential side gears |
| 4482360001 | DIFFERENTIAL BEVEL GEAR | Primary gear inside differential case |
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