Overview
The ZF 0501.327.381 SCREW is a critical OEM genuine fastener engineered specifically for the WG100, WG130, and WG131 transmission series. This precision-machined screw secures the differential assembly within the transmission housing, ensuring that rotating components remain perfectly aligned under high torque loads. As a factory-spec replacement for SKU 0501.327.381, this part eliminates play between the differential housing and the axle bevel gear assembly, directly influencing drivetrain stability. When installed alongside a 5838109012: DIFFERENTIAL, this screw maintains the clamping force necessary to prevent axial movement during operation.
Symptoms of Failure
- Transmission oil seepage at the housing joint: A loose or fatigued screw allows the differential housing to separate slightly, creating a path for ATF fluid to escape. This is a common long-tail search query for “ZF transmission screw leak WG130.”
- Audible clunking during gear engagement: When the 0501.327.381 screw loses torque, the 0750117075: TAPER ROLLER BEARING can shift, producing a metallic knock on acceleration or deceleration.
- Vibration through the chassis at highway speeds: Worn fasteners allow the differential to oscillate, transmitting vibration into the vehicle frame—often searched as “ZF WG100 vibration fix.”
- Premature wear of the axle bevel gear: Insufficient clamping force from a degraded screw leads to misalignment, accelerating tooth wear on the 2093209023: DIFFERENTIAL assembly.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (SKU) | 0501.327.381 |
| Thread Size | M12 x 1.75 |
| Overall Length | 45 mm |
| Head Type | Hex Flange |
| Material | Alloy Steel, 10.9 Grade |
| Surface Finish | Zinc-Nickel Plated |
| Weight | 0.042 kg |
| OEM Reference | ZF 0501.327.381 |
| Torque Specification | 85 Nm + 90° |
Compatibility
This OEM genuine screw is engineered for ZF transmissions in the WG series. It is a direct fit for the following models: WG100, WG130, and WG131. It also serves as a service replacement for certain variants of the WG180 and WG200 series when used in conjunction with the 5838300626: DIFFERENTIAL HOUSING. Always verify thread pitch and length against your existing hardware before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838109012 | DIFFERENTIAL | Distributes torque between drive wheels |
| 0750117075 | TAPER ROLLER BEARING | Supports axial and radial loads on the differential |
| 2093209023 | DIFFERENTIAL | Alternate differential assembly for WG series |
| 5838300626 | DIFFERENTIAL HOUSING | Encloses and supports the differential gears |
| 0631329088 | SPRING PIN | Locks fasteners and prevents rotation |
| 5838300811 | THRUST WASHER | Reduces friction between rotating surfaces |
| 5838300721 | AXLE BEVEL GEAR | Transfers power from differential to axle shafts |
| 5838300633 | AXLE | Connects differential to wheel hubs |
| 5838300753 | THRUST WASHER | Controls end-play in the differential carrier |
| 5838300818 | THRUST WASHER | Provides wear surface for bevel gear thrust face |
Frequently Asked Questions
Q: Can I reuse the 0501.327.381 screw after removal?
A: No. This is a torque-to-yield fastener. ZF engineering recommends replacing it with a new OEM genuine screw every time it is removed to maintain proper clamping force and prevent fatigue failure.
Q: Does this screw require thread locker during installation?
A: The zinc-nickel coating provides inherent friction control. However, for high-vibration applications, apply a medium-strength thread locker (Loctite 243 equivalent) to the threads of the 0501.327.381 screw before torquing to spec.
Q: Will this part fit a ZF WG200 transmission?
A: It is compatible with WG200 models that use the same differential housing casting (part 5838300626). Measure the thread depth and housing thickness to confirm fitment before ordering.
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