Overview
The ZF 0736.010.120 HEXAGON SCREW is a critical fastening component engineered specifically for the WG 181 series transmission. This OEM genuine part secures the TRANSMISSION HOUSING and HOUSING assemblies, ensuring precise clamping force to maintain gear alignment and hydraulic pressure integrity. The SKU 0736.010.120 is manufactured to ZF’s exacting tolerances, preventing micro-movement that can lead to premature wear in high-torque applications. Installed at critical junction points within the WG181 gearbox, this hexagon screw works in concert with the THREADED BUSH to distribute load evenly across mating surfaces.
Symptoms of Failure
- Transmission fluid seepage at housing joints – A loose or fatigued 0736.010.120 screw can compromise the seal between the TRANSMISSION HOUSING and cover, causing oil to weep during operation. This is often detected as dark residue around bolt heads.
- Intermittent gear engagement hesitation – When this hexagon screw loses torque, the HOUSING alignment shifts slightly, leading to delayed clutch pack engagement under load.
- Abnormal vibration during torque converter lockup – A degraded screw allows micro-play in the THREADED BUSH, transmitting harmonic vibrations through the driveline at highway speeds.
- Metallic debris in transmission pan – Stripped threads from a failing 0736.010.120 can shed steel particles, contaminating the hydraulic circuit and accelerating wear on valve bodies.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 0736.010.120 |
| Type | Hexagon Screw (DIN 933 / ISO 4017) |
| Thread Size | M10 x 1.5 |
| Length | 30 mm |
| Head Height | 6.4 mm |
| Material | High-tensile steel (10.9 grade) |
| Surface Finish | Zinc-plated (yellow passivated) |
| Weight | 22 g (0.78 oz) |
| OEM Reference | ZF 0736.010.120 |
| Torque Spec | 45 Nm ± 3 Nm |
Compatibility
This hexagon screw is primarily designed for the ZF WG 181 series, but it also fits select models in the WG180, WG200, and WG210 families due to shared housing architecture. The 0736.010.120 is used in both 4-speed and 6-speed variants where the THREADED BUSH is present. Always verify thread pitch against your specific transmission serial number, as early WG180 units may use M12 fasteners. The TYPE PLATE on your transmission housing will confirm exact model compatibility.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101047 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4644301380 | HOUSING | Secondary housing for valve body assembly |
| 4644301189 | THREADED BUSH | Reinforced thread insert for screw retention |
| 0730365067 | TYPE PLATE | Identification plate with transmission specs |
| 0631311009 | GROOVED STUD | Alignment dowel for housing positioning |
| 4644301161 | COVER PLATE | Sealing cover for access port |
| 0636100621 | HEXAGON SCREW | Alternate length screw for deep bosses |
| 0631610020 | SET SCREW | Adjustable stop for shift forks |
| 0634801098 | SEALING RING | Copper washer for leak-proof seal |
| 4644301117 | FIXING PLATE | Retaining bracket for harness routing |
