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- Wanda Plaza, Jinan, Shandong, China
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Maximum wheel retention and road safety for heavy commercial vehicles – The OEM WG9900241002 Wheel Bolts are high-strength fasteners engineered to secure wheels on SINOTRUK HOWO, SHACMAN, and other heavy-duty trucks. Made from premium alloy steel and heat-treated to Grade 12.9, these bolts provide exceptional clamp load and fatigue resistance, preventing wheel separation under extreme loads.
Each bolt features a precision-rolled thread and a corrosion-resistant coating that withstands road salt and moisture. For guaranteed compatibility and safety-critical performance, always choose genuine Sinotruk Homan parts.
The WG9900241002 Wheel Bolts meet ISO 898-1 property class 12.9, offering a tensile strength of 1220 MPa and a proof load of 1100 MPa. They are essential for maintaining proper wheel torque and preventing loose wheel nuts, a leading cause of roadside breakdowns.
The WG9900241002 Wheel Bolts are manufactured from chrome‑molybdenum alloy steel (42CrMo4), quenched and tempered to achieve uniform hardness across the bolt shank. Unlike standard 10.9 grade bolts, these 12.9 class fasteners offer 20% higher proof load, reducing the risk of thread stripping or bolt elongation under dynamic wheel loads.
The rolled thread profile (not cut) work‑hardens the thread roots, greatly improving fatigue life. Magnetic particle inspection of every batch ensures zero micro‑cracks. The spherical or conical seat (depending on wheel type) is precisely ground to ±0.1 mm for perfect mating with the wheel nut.
Fleet operators using the WG9900241002 report no wheel‑off incidents and a 50% reduction in re‑torquing frequency during initial service. The bolts also feature a yellow‑zinc plating that provides 240 hours of salt spray corrosion protection, critical for winter operations.
Tensile strength ≥1220 MPa, proof load ≥1100 MPa. Exceeds standard 10.9 requirements, providing extra safety margin for heavy loads.
Yellow zinc plating with clear trivalent passivation. Passes 240h salt spray (ASTM B117), preventing rust seizure in wet conditions.
Rolled M22 x 1.5 thread per ISO 965-1. Class 6g fit, with magnetic particle inspection to eliminate surface defects.
| OEM Number | WG9900241002 |
| Product Name | Wheel Bolts (Hub Bolts) |
| Brand | SINOTRUK Homan |
| Property Class | 12.9 (ISO 898-1) |
| Material | 42CrMo4 alloy steel (chrome‑molybdenum) |
| Thread Size | M22 x 1.5 (metric fine thread) |
| Thread Class | 6g (rolled, not cut) |
| Overall Length | 140 mm, 150 mm, 160 mm variants (consult application) |
| Head Type | Hexagon head (24 mm across flats) or conical seat |
| Seat Angle | 60° conical (for steel wheels) or flat with washer |
| Tensile Strength (min) | 1220 MPa (177,000 psi) |
| Proof Load (min) | 1100 MPa (160,000 psi) |
| Hardness Range | 39 – 44 HRC |
| Surface Coating | Yellow zinc trivalent plating, 240h salt spray |
| Recommended Torque | 550 – 650 Nm (apply anti‑seize on threads) |
| Standards | ISO 898-1, DIN EN 26157, VDI 2230 |
The WG9900241002 Wheel Bolts start as spheroidized‑annealed wire rod, cold‑forged into a near‑final shape to align grain flow along the bolt axis. This cold‑heading process produces a component with superior fatigue resistance compared to machined bolts.
After forging, threads are rolled at 50 tons of pressure, work‑hardening the root radius. Rolled threads have no material removal, thus no stress risers. The bolts then undergo a three‑stage heat treatment: austenitizing (850°C), oil quenching, and tempering (425°C) to achieve uniform 39‑44 HRC.
Every lot of WG9900241002 is 100% magnetic particle inspected (MPI) to detect surface cracks. A torque‑tension test on a Skidmore‑Wilhelm gauge verifies the friction coefficient (typically 0.12‑0.16 with zinc plating). The batch release certificate includes these data.
The yellow zinc plating on WG9900241002 consists of a base layer of zinc (5‑8 µm) followed by a trivalent chromate conversion coating. This is sealed with a topcoat for enhanced corrosion resistance. The result is a fastener that remains removable even after years of exposure to road salt.
Salt spray testing per ASTM B117 shows no red rust after 240 hours, far exceeding the 72‑hour requirement for standard coated bolts. The plating adds only 0.005‑0.008 inches to the thread diameter, which is accounted for in the 6g thread fit.
For applications requiring even higher corrosion resistance (e.g., coastal mines), a geometric coating is available upon special order.
The WG9900241002 Wheel Bolts are direct replacements for original bolts on SINOTRUK HOWO, SHACMAN, and HANDE wheel hubs. They are used on both drive axles and trailer axles with M22 x 1.5 thread.
When replacing bolts, always install new bolts – never reuse old bolts. Apply a thin layer of anti‑seize compound (copper or nickel based) to the threads and the conical seat. Torque in a star pattern to 600 Nm (range 550‑650 Nm).
Do not mix bolts of different grades on the same wheel. Always replace all bolts on a hub if any bolt shows signs of corrosion or thread damage. After 100 km, re‑torque all bolts.
Proper installation of WG9900241002 Wheel Bolts is critical for safety. 1) Clean the hub bolt holes with a wire brush to remove rust and old thread locker.
2) Apply a small amount of anti‑seize (nickel or copper based) to the bolt threads and the conical seat. Do not use oil or grease alone. 3) Start all bolts by hand to avoid cross‑threading.
4) Use a calibrated torque wrench (accuracy ±5%). Tighten in a star pattern in three stages: first 200 Nm, then 400 Nm, finally 600 Nm (550‑650 Nm range).
5) After the first 50‑100 km of driving, re‑torque all bolts to the same specification. 6) Never use impact wrenches without a torque limiter – they often exceed 800 Nm, causing bolt stretching.
Inspect WG9900241002 Wheel Bolts every 20,000 km. Look for rust on the threads, signs of metal flow (stretching), or damage to the hexagonal head. A torque check should be performed – if any bolt turns less than 10° before reaching 600 Nm, the bolt has permanently stretched and must be replaced.
If bolts are removed for any reason (tire change, brake service), discard them and install new bolts. The clamping force of a previously torqued bolt is unpredictable due to thread wear and permanent set.
Never paint over wheel bolts – paint can hide cracks and affect torque. The zinc plating provides adequate protection; if the plating is worn, replace the bolt.
Each batch of WG9900241002 Wheel Bolts is tested in an ISO 17025 accredited lab. Tests include: (1) Tensile strength (destructive, 5 samples per lot), (2) Proof load test (0.94 × tensile strength, no permanent set), (3) Hardness test (Rockwell C scale, 5 measurements).
(4) Thread gauge inspection (Go/No‑Go for class 6g), (5) Salt spray test (ASTM B117, 240h), (6) Microstructure examination (grain flow, decarbonization depth ≤0.05 mm). (7) Magnetic particle inspection (wet method, AC yoke, 100% of all bolts).
The bolts comply with ISO 898-1, VDI 2230, and OEM specifications. A certificate of conformance (EN 10204 3.1) is provided with each bulk order.
A European logistics company operating 400 HOWO tractors switched to WG9900241002 after experiencing wheel nut loosening with lower‑grade bolts. After 18 months and 20 million cumulative kilometers, no wheel‑off incidents were recorded, and torque checks showed minimal variation.
A mining contractor in Western Australia reported that the corrosion resistance of these bolts extended replacement intervals from 6 months to 2 years in high‑humidity salt environment, reducing maintenance costs by 60%.
Each WG9900241002 Wheel Bolt is individually bagged in a corrosion‑inhibiting VCI bag or bulk packed in a cardboard box with a plastic liner. A batch label with QR code is affixed to each box.
The bolt head is stamped with “12.9” and a manufacturer’s traceability mark. A holographic SINOTRUK Homan sticker on the outer box protects against counterfeits. Counterfeit bolts often have a dull finish, missing head markings, or inconsistent thread quality.
Scan the QR code on the box to verify authenticity on the SINOTRUK Homan portal. Purchase only from authorized distributors – counterfeit wheel bolts can lead to catastrophic wheel separation.
Summary: The SINOTRUK Homan Wheel Bolts (OEM WG9900241002) deliver Grade 12.9 strength, corrosion resistance, and precision threading for heavy‑duty truck wheels. Upgrade your wheel fasteners with genuine OEM bolts – the trusted choice for road safety and uptime.
If you have any questions about our products, services, or anything related to what we offer, please don’t hesitate to leave us a message—our dedicated team is always ready to provide prompt and helpful responses to address your concerns. What’s more, when you become our valued customer, we’re delighted to offer you complimentary catalog services, giving you access to detailed, up-to-date information on our full range of products, specifications, and offerings to help you make informed decisions.
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