Overview
The ZF 0636.021.005 HEXAGON SCREW is a critical fastening component engineered specifically for the WG150 transmission series. This OEM genuine part secures the transmission housing assembly, ensuring precise clamping force and structural integrity under high-torque operating conditions. As a factory-specified fastener, the SKU 0636.021.005 is designed to withstand extreme vibration and thermal cycling without loosening. It is typically installed along the mating flange of the TRANSMISSION HOUSING or the TRANSMISSION HOUSING, where it maintains a leak-proof seal between cast sections. Using this genuine hexagon screw prevents misalignment that could compromise the TYPE PLATE identification and overall transmission durability.
Symptoms of Failure
- Transmission oil seepage at housing joint: A worn or stretched 0636.021.005 screw reduces clamping force, allowing ATF fluid to weep between the housing halves. This is often visible as dark residue near the bolt heads.
- Abnormal gear engagement noise: When this hexagon screw loses preload, the housing can shift slightly under load, producing a metallic clunking or whining sound during gear changes.
- Vibration during acceleration: Loose fasteners in the WG150 series cause the entire transmission assembly to vibrate, particularly at 1500-2000 RPM, indicating the screw is no longer securing the GROOVED STUD alignment.
- Visible corrosion or thread galling: If the hexagon screw shows rust or stripped threads, it cannot maintain proper torque, leading to progressive loosening and potential housing damage.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (SKU) | 0636.021.005 |
| Thread Size | M10 x 1.5 |
| Length | 35 mm |
| Head Type | Hexagon (6-point) |
| Material | High-tensile steel, zinc-plated |
| Weight | 0.04 kg (approx.) |
| OEM Reference | ZF 0636.021.005 |
| Torque Specification | 45 Nm + 90° angle |
Compatibility
This hexagon screw is primarily designed for the ZF WG150 transmission series. Based on its thread pattern and clamping application, it is also compatible with the following ZF models: WG180, WG200, WG210, and WG250 series transmissions that share the same housing bolt pattern. Always verify the screw length against your specific housing depth, as variations exist between the TRANSMISSION HOUSING and TRANSMISSION HOUSING variants. For mixed-model fleets, cross-reference the TYPE PLATE to confirm the exact transmission revision before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101109 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4642301205 | TRANSMISSION HOUSING | Alternative housing variant for WG150 |
| 0730365125 | TYPE PLATE | Identification plate for transmission model |
| 0631311009 | GROOVED STUD | Alignment stud for housing positioning |
| 4642301168 | SCREEN SHEET | Filter screen for oil sump |
| 4642301169 | SCREEN SHEET | Secondary filter screen variant |
| 0636100621 | HEXAGON SCREW | Alternate hex screw for cover plates |
| 4642301186 | SCREEN SHEET | Fine mesh screen for hydraulic circuit |
| 4644106300 | SHIFT SYSTEM | Gear selection mechanism assembly |
| 4644306500 | COVER PLATE | Access cover for valve body |
