Overview
The ZF 0636.016.112 HEXAGON SCREW is a critical fastening component engineered specifically for the WG260 transmission series and its closely related variants. This OEM genuine part (SKU: 0636.016.112) secures the differential housing assembly to the transmission casing, ensuring precise alignment of internal gear sets under high torque loads. As a hexagon-headed bolt, it provides the clamping force necessary to maintain the structural integrity of the drivetrain, preventing relative movement between the DIFFERENTIAL HOUSING and the main transmission body. Without this screw, the entire differential assembly—including the DIFFERENTIAL unit—would be prone to misalignment, leading to accelerated wear on the CROWN WHEEL and pinion gears.
Symptoms of Failure
When the ZF 0636.016.112 hexagon screw fatigues or loosens, operators will notice distinct mechanical distress. Oil seepage around the transmission flange is the most common early indicator, as the compromised clamping force allows lubricant to escape past the gasket. Intermittent gear slipping under load occurs when the differential housing shifts slightly, altering the mesh pattern between the crown wheel and pinion. A persistent knocking sound during acceleration or deceleration signals that the screw has lost preload, allowing the DIFFERENTIAL assembly to move axially. Finally, vibration in the driveline at highway speeds often points to uneven bolt tension, which can lead to catastrophic failure of the DIFFERENTIAL HOUSING if left unaddressed.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 0636.016.112 |
| Type | Hexagon Screw (Bolt) |
| Thread Size | M16 x 1.5 (estimated) |
| Length | 45 mm (estimated) |
| Head Size | 24 mm hex (estimated) |
| Material | High-tensile alloy steel, zinc-plated |
| Weight | 0.08 kg (estimated) |
| OEM Reference | ZF 0636.016.112 |
| Grade | 10.9 (estimated) |
Compatibility
This hexagon screw is a standard fastening element across multiple ZF WG-series transmissions. It is directly compatible with the WG 115, WG 130, WG 150, WG 158, WG 160, WG 180, WG 190, WG 201, WG 210, WG 250, WG 251, WG 258, WG 260, WG 261, WG 308, and WG 311 series. In each of these models, the 0636.016.112 screw is used to secure the differential housing cover or the main bearing retainer. For a complete rebuild, always pair this screw with a new THRUST WASHER and inspect the BALL BEARING for wear.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2099109002 | DIFFERENTIAL | Distributes torque between wheels |
| 2099364014 | CROWN WHEEL | Transfers power from pinion to differential |
| 2099209001 | DIFFERENTIAL | Complete differential assembly variant |
| 2098309010 | DIFFERENTIAL HOUSING | Encloses differential gears |
| 2098309009 | DIFFERENTIAL HOUSING | Alternate housing casting |
| 2098309031 | AXLE BEVEL GEAR | Drives axle shafts |
| 2098309030 | AXLE BEVEL GEAR | Matching bevel gear for opposite side |
| 2098309032 | DIFFERENTIAL BEVEL GEAR | Planetary gear within differential |
| 12883200682 | THRUST WASHER | Reduces axial friction |
| 0635332059 | BALL BEARING | Supports rotating shafts |
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