ZF 0636.011.221 HEXAGON SCREW for WG100/WG130/WG131 | OEM Genuine Part

Overview

The ZF 0636.011.221 HEXAGON SCREW is a critical OEM genuine fastener engineered for secure assembly within WG100, WG130, and WG131 transmission systems. This hexagon screw anchors the 2094101012 TRANSMISSION HOUSING to internal structural components, ensuring precise alignment under high torque loads. As a factory-spec replacement, part number 0636.011.221 prevents loosening caused by vibration and thermal cycling. It is categorized under Springs & Fasteners and is essential for maintaining the integrity of the gear train assembly.

Symptoms of Failure

• Oil seepage at housing joints: A worn or stripped 0636.011.221 hexagon screw compromises the seal between the 2094301036 HOUSING and adjacent components, leading to visible fluid leaks around the transmission casing.
• Abnormal gear engagement noise: When this fastener loses clamping force, the 2094298057 HOUSING shifts slightly, producing a distinct clattering or grinding sound during gear changes.
• Intermittent torque loss: A fatigued hexagon screw causes the 2094301071 COVER to loosen, resulting in unpredictable power delivery and hesitation under load.
• Visible thread galling: Over-tightened or corroded fasteners show metal transfer on threads, indicating imminent failure that can lead to complete disassembly of the housing stack.

Technical Specifications

Compatibility

This hexagon screw is designed for ZF WG-series transmissions, specifically the WG100, WG130, and WG131 models. It also fits select WG180 and WG200 variants where the housing bolt pattern matches the M10 thread. Always verify the thread pitch and length against your transmission’s 2094301036 HOUSING before installation. For older WG80 units, cross-reference with the 0636011356 HEXAGON SCREW which shares similar dimensions.

Related Components

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