Overview
The ZF 0636.010.046 HEXAGON SCREW is a critical OEM genuine fastening component engineered specifically for the WG 65 and WG 180 series transmissions. This precision-machined bolt secures the TRANSMISSION HOUSING assembly, ensuring structural integrity under high torque loads. As an original equipment part, SKU 0636.010.046 guarantees exact thread pitch and tensile strength required for reliable gear train alignment. Without this screw, the housing cannot maintain proper bearing preload, leading to accelerated wear on internal planetary gear sets.
Symptoms of Failure
- Transmission oil seepage at housing joints — A loose or fatigued 0636.010.046 screw allows the housing flanges to separate slightly, causing ATF fluid to weep during operation. This is often misdiagnosed as a gasket failure.
- Abnormal gear engagement noise — When this hexagon screw loses clamping force, the housing shifts under load, producing a distinct metallic clatter during gear changes.
- Vibration during torque converter lockup — Worn fasteners in the housing assembly create micro-movements that transmit as low-frequency vibration through the driveline, particularly at highway speeds.
- Intermittent pressure loss in clutch packs — Housing flex caused by insufficient screw tension disrupts oil gallery sealing, resulting in delayed shifts or slipping under heavy load.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 0636.010.046 |
| Thread Size | M10 x 1.5 (estimated) |
| Length | 45 mm |
| Head Type | Hexagon, 17 mm AF |
| Material | High-tensile steel, 10.9 grade |
| Surface Finish | Zinc-plated, yellow passivated |
| Weight | 0.042 kg |
| OEM Reference | ZF 0636.010.046 |
| Torque Spec | 55 Nm + 90° angle (factory) |
Compatibility
This OEM hexagon screw is validated for use in the following ZF transmission families: WG 65 Series (all variants including WG65-4, WG65-5), WG 180 Series (WG180-4, WG180-5), and select WG 200 Series models where the housing bolt pattern matches. It is not interchangeable with the shorter HEXAGON SCREW (0636011038) used for valve body attachment, nor with the longer HEXAGON SCREW (0636011118) for oil pan retention. Always verify thread engagement depth; the HEXAGON SCREW (0636016015) serves a different torque application in the clutch housing.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101065 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 0636011038 | HEXAGON SCREW | Valve body fastening screw |
| 0636011118 | HEXAGON SCREW | Oil pan retention bolt |
| 0636016015 | HEXAGON SCREW | Clutch housing mounting screw |
| 0631306085 | CYLINDRICAL PIN | Housing alignment dowel |
| 0634313118 | O-RING | Housing face seal |
| 0636304019 | SCREW PLUG | Oil gallery access plug |
| 0634801152 | SEALING RING | Copper crush washer for plug |
| 0732611049 | FILTER INSERT | Suction strainer element |
| 0634303718 | O-RING | Filter housing seal |
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