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Precision fastening for heavy-duty wheel ends – The OEM Z4D-01076-A Rear Wheel Hub Bearing Lock Nut is engineered to provide consistent clamp load and precise adjustment of tapered roller bearings on drive axles. Made from high-strength steel with a corrosion-resistant finish, this lock nut ensures safe wheel hub retention and extended bearing life. For guaranteed compatibility and performance, always choose genuine Sinotruk Homan parts.
The Z4D-01076-A features a precision-machined thread (M90 x 1.5) and an integrated locking mechanism that prevents loosening under vibration, eliminating the need for separate tab washers.
The Z4D-01076-A lock nut is manufactured from case-hardened steel (grade 10.9 equivalent) with a black oxide or zinc-nickel finish, offering superior resistance to corrosion from road salts and moisture. The thread is rolled rather than cut, which increases fatigue strength and ensures smooth engagement with the axle spindle.
Unlike generic nuts that rely on plastic inserts or deformed threads for locking, this genuine SINOTRUK Homan component uses a precision-ground locking ring that positively engages with a groove on the axle. This mechanical lock is unaffected by oil, temperature, or repeated use.
The hexagonal drive is sized for standard sockets (105mm across flats), and the nut includes witness marks to verify proper torque application. Designed for a torque specification of 450-500 Nm plus a 60-degree final rotation, it guarantees the correct preload on the wheel bearings.
Rolled M90 x 1.5 thread with ISO 6H tolerance. Consistent torque application and no cross-threading when installed correctly.
Spring-loaded locking ring engages into a groove on the axle spindle. No need for separate tab washers or adhesives.
Zinc-nickel coating with a topcoat, tested to 480 hours salt spray (ASTM B117). Prevents seizing on the axle spindle.
| OEM Number | Z4D-01076-A |
| Product Name | Rear Wheel Hub Bearing Lock Nut (Axle Nut) |
| Brand | SINOTRUK Homan |
| Thread Size | M90 x 1.5 (metric coarse) |
| Hex Size (AF) | 105 mm (4.13 inches) |
| Overall Height | 32.5 mm ± 0.3 mm |
| Outer Diameter | 112 mm (flange) |
| Material | Case-hardened 42CrMo4 steel (Grade 10.9) |
| Surface Finish | Zinc-nickel plus topcoat (480h salt spray) |
| Hardness (core) | 28-32 HRC |
| Hardness (case) | 550-650 HV0.3 (min 0.5mm depth) |
| Locking Type | Mechanical spring-loaded ring, engage groove |
| Recommended Torque | 450-500 Nm + 60° angle (stretch method) |
| Thread Tolerance | 6H (rolled thread, no burrs) |
| Temperature Range | -40°C to +150°C (continuous) |
| Compatible Axles | SINOTRUK HOWO, A7, T7H, C7H drive axles (rear) |
| Reuse Limitation | Max 3 reinstalls (locking ring may wear) |
The Z4D-01076-A lock nut is manufactured on CNC threads-rolling machines, which cold-form the thread profile without cutting. This produces a smoother finish and work-hardens the thread root, increasing fatigue resistance by up to 30% compared to cut threads.
The locking mechanism consists of a spring-steel ring with internal lugs that snap into a machined groove on the axle spindle. When the nut is tightened, the ring compresses; once the nut reaches its final position, the ring expands into the groove, preventing back-off even under severe vibration. This design is superior to nylon-insert or deformed-thread nuts, which lose effectiveness after one use.
A built-in thrust washer (integral with the nut face) distributes clamp load uniformly across the bearing cone, reducing the risk of brinelling. The nut face is ground flat to 0.05mm parallelism, ensuring even pressure on the bearing inner race.
The Z4D-01076-A is forged from 42CrMo4 chromium-molybdenum steel, which provides excellent toughness and resistance to hydrogen embrittlement. After heat treatment, the core retains ductility while the surface is case-hardened to resist wear from the locking ring.
The zinc-nickel plating is applied with a trivalent chromate passivation, making it environmentally friendly yet highly protective. The coating thickness is 8-12 microns, and the nut passes 480 hours of neutral salt spray testing without red rust.
The Z4D-01076-A is a direct replacement for the original axle nut on SINOTRUK Homan rear drive axles. It fits the same M90 x 1.5 spindle thread and uses the standard 105mm socket. The locking ring is pre-installed in the nut; no additional components are needed.
Installation requires a socket and torque wrench capable of 500 Nm. After tightening to the initial torque, the nut is rotated an additional 60° using an angle gauge. The locking ring will snap into the groove audibly.
Correct installation of the Z4D-01076-A lock nut is critical for wheel bearing life and safety. Follow this procedure: 1) Clean the axle spindle threads and the nut threads thoroughly. Any debris will affect torque readings.
2) Apply a thin film of bearing grease to the threads (do not use anti-seize on this locking nut design). 3) Thread the nut onto the spindle by hand until it contacts the bearing inner race.
4) Torque the nut to 200 Nm while rotating the wheel hub to seat the bearing. Then back off the nut one full turn. 5) Re-torque to 100 Nm, then tighten an additional 60 degrees using an angle gauge.
6) Verify that the locking ring has engaged: you should hear a click and the nut cannot be backed off by hand. 7) Stake the axle spindle cotter pin or retaining ring per vehicle manual.
The Z4D-01076-A lock nut can be reused up to three times if the locking ring remains undamaged. However, if the ring shows signs of deformation or the nut has been overtightened, replace it. Always inspect the axle spindle groove for burrs before reinstalling.
Symptoms of a loose nut: wheel wobble, abnormal bearing noise (growling on turns), or premature tire wear. If found, disassemble, inspect bearings, and install a new nut. Do not overtighten to compensate – this will cause bearing overheating.
Never use a chisel or impact gun on the nut – always use a torque wrench and socket. The threads are precision-ground and can be damaged by hammering.
The Z4D-01076-A lock nut is produced in an IATF 16949 certified facility. Each batch undergoes 100% thread gauge inspection and hardness testing. Random samples are tested for locking torque (breakaway value after 10 cycles), salt spray resistance, and tensile strength (minimum 210,000 N).
An endurance test is performed on a vibration table (20g, 10-2000 Hz for 100 hours) while the nut is torqued to specification. No loosening is permitted. A thermal cycling test from -40°C to +120°C over 500 cycles verifies that the locking ring retains grip.
The nut meets or exceeds OEM mechanical properties per ISO 898-2 (property class 10). A laser-etched QR code on the nut face provides batch traceability. Counterfeit nuts often have coarse cut threads, insufficient hardness, or plastic locking rings – always verify authenticity.
A fleet of 300 SINOTRUK HOWO dump trucks in a Canadian mining operation replaced all axle nuts with the Z4D-01076-A. After 24 months, zero axle nut loosening events were reported, compared to 12 failures per year previously. The fleet also noted reduced bearing replacement frequency (extended from 200,000 km to over 400,000 km).
A European long-haul carrier using T7H tractors reported that the genuine lock nuts eliminated wheel hub vibration that had been causing premature ABS sensor failures. The company now standardizes on SINOTRUK Homan parts for all axle repairs.
Each genuine Z4D-01076-A lock nut is packed in a sealed plastic bag inside a yellow-and-black SINOTRUK Homan box. The box includes a QR code verification sticker and installation instructions.
The nut itself has the OEM number laser-etched on its face, along with a unique serial number. The locking ring is visible through a side hole; it should be bright steel with a smooth feel. Counterfeit nuts often have painted surfaces that mask rough machining and lack the springy locking ring. Always scan the QR code before installation.
Using a non-genuine lock nut can lead to wheel separation, bearing seizure, or axle spindle damage – catastrophic failures costing tens of thousands in repairs and downtime.
Summary: The SINOTRUK Homan Rear Wheel Hub Bearing Lock Nut (OEM Z4D-01076-A) delivers precise clamping, positive locking, and exceptional durability for heavy-duty axles. Protect your wheel bearings and ensure safe operation – choose this genuine component trusted by fleets worldwide.
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