Overview
The ZF 0636.100.520 HEXAGON SCREW is a precision-engineered OEM genuine fastener designed for critical mounting points within the WG200 and WG92 series transmissions. This hexagon screw secures the 2098117002: HOUSING assembly to the main transmission casing, ensuring proper alignment and clamping force under high-torque conditions. As a direct OEM replacement, part number 0636.100.520 maintains factory-specified tensile strength to prevent loosening during gear shifts. Its hexagonal head allows for accurate torque application using standard tools, making it essential for both rebuilds and preventive maintenance on heavy-duty ZF drivelines.
Symptoms of Failure
- Transmission oil seepage around bolt heads: A worn or stripped 0636.100.520 hexagon screw can compromise the seal between the housing and transmission body, leading to slow oil leaks that worsen under load.
- Abnormal gear engagement noise: When this screw loses clamping force, the 2098301052: REAR AXLE HOUS. may shift slightly, causing metallic clunking or whining during acceleration.
- Vibration in neutral or drive: Loose fasteners allow micro-movement of internal components, resulting in noticeable chassis vibration that increases with RPM.
- Premature wear of adjacent studs: A failing hexagon screw forces the 0636103300: STUD and 0637101164: HEXAGON NUT to bear uneven loads, accelerating fatigue across the assembly.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 0636.100.520 |
| Type | Hexagon Screw (Bolt) |
| Thread Size | M10 x 1.5 (estimated) |
| Length | 45 mm (estimated) |
| Head Size | 17 mm hex (estimated) |
| Material | High-tensile steel, zinc-plated |
| Weight | 0.04 kg (estimated) |
| OEM Reference | ZF 0636.100.520 |
| Grade | 10.9 (estimated) |
Compatibility
This hexagon screw is specifically engineered for ZF WG200 and WG92 series transmissions. It is a direct fit for the WG180, WG200, WG210, and WG92 models where it secures the main housing to the bellhousing. The 0636.100.520 also interfaces with the 0636102566: STUD and 0636100960: STUD in multi-point fastening systems. For complete housing integrity, always pair this screw with the 0637101167: HEXAGON NUT and 0634303044: O-RING to prevent fluid bypass. It is not compatible with older ZF 4HP or 5HP series without adapter kits.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2098117002 | HOUSING | Main transmission casing |
| 2098301052 | REAR AXLE HOUS. | Rear axle housing cover |
| 0636103300 | STUD | Threaded alignment rod |
| 0637101164 | HEXAGON NUT | Locking nut for studs |
| 0636102566 | STUD | Secondary alignment stud |
| 0636100960 | STUD | Short mounting stud |
| 0637101167 | HEXAGON NUT | Heavy-duty lock nut |
| 0634303044 | O-RING | Fluid seal gasket |
| 2098317013 | BRAKE HOUSING | Brake drum enclosure |
| 2098317028 | BRAKE HOUSING | Brake housing variant |
