ZF 0636.100.402 HEXAGON SCREW for WG100/WG130/WG131 | OEM Genuine Part

Overview

The ZF 0636.100.402 HEXAGON SCREW is a critical OEM genuine fastener engineered for secure assembly within the WG100, WG130, and WG131 transmission series. This hexagon screw anchors key driveline components, ensuring precise torque retention and structural integrity under high-load conditions. As a factory-spec replacement, SKU 0636.100.402 directly interfaces with the differential housing and axle assemblies, preventing unwanted movement that can lead to misalignment. When paired with a REAR AXLE or DIFFERENTIAL, this screw maintains the rigid connection required for optimal power transfer and long service life.

Symptoms of Failure

• Transmission oil seepage around the housing: A loosened or fatigued hexagon screw can compromise the seal between the DIFFERENTIAL HOUSING and mating surfaces, leading to visible fluid loss.
• Abnormal gear whine or clunking during acceleration: When this fastener loses clamping force, the TAPER ROLLER BEARING may shift, causing irregular gear mesh and audible noise.
• Vibration in the driveline under load: A degraded hexagon screw allows micro-movement in the axle assembly, resulting in noticeable shuddering during torque application.
• Intermittent gear engagement hesitation: Insufficient screw tension can alter differential alignment, leading to delayed or rough shifting in WG-series transmissions.

Technical Specifications

Compatibility

This hexagon screw is specifically designed for ZF WG100, WG130, and WG131 transmissions. It is also suitable for select WG180 and WG200 variants where the differential housing and axle interface share the same bolt pattern. Always verify thread pitch and length against your existing fastener before installation. For complete assembly integrity, consider replacing the SPRING PIN and THRUST WASHER concurrently to prevent premature wear on adjacent components.

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