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Precision axial retention for rotating shafts in heavy‑duty transmissions – The OEM WB43340 × 2.4 Elastic Retaining Ring For Shaft is a high‑performance circlip specifically designed to secure gears, bearings, and other components on shafts, preventing axial movement under severe vibration and shock loads. Manufactured from premium spring steel with a precise elastic fit, this retaining ring guarantees reliable positioning and long service life. For guaranteed compatibility and performance, always choose genuine Sinotruk Homan parts.
The WB43340 × 2.4 elastic retaining ring (also known as a snap ring or circlip) is dimensioned to fit shafts with a nominal diameter of 43.340 mm and has a cross‑sectional thickness of 2.4 mm. Its open‑ended design allows easy installation into a precisely machined groove, providing a positive axial stop without the need for thread locks or adhesives.
The WB43340 × 2.4 elastic retaining ring is a stamped external retaining ring manufactured from high‑carbon spring steel (grade 65Mn or equivalent). It is through‑hardened to 44‑51 HRC to provide excellent elasticity and resistance to permanent deformation. The ring is designed to be seated in a precision‑machined groove on a shaft, where it expands to exert a constant radial force, holding the ring securely in place while providing a rigid axial stop.
This specific size (43.340 mm free inner diameter, 2.4 mm wire thickness) is commonly used in SINOTRUK Homan gearboxes, power take‑off units, and rear axle assemblies to secure gears, bearings, and synchroniser assemblies. The elastic deformation of the ring allows it to be quickly installed and removed with standard circlip pliers, simplifying both assembly and maintenance.
Compared to ordinary stamped rings, the genuine WB43340 × 2.4 offers superior fatigue resistance, tighter dimensional tolerances (±0.05 mm on diameter), and a phosphate coating that resists corrosion and reduces friction during installation. The ring’s edges are deburred and chamfered to prevent damage to the shaft or housing, and the gap is carefully controlled to ensure uniform clamping force around the entire circumference.
Designed to match a groove diameter of 43.4 mm (shaft) with exacting tolerances, ensuring zero axial play when installed correctly.
Made from vacuum‑degassed 65Mn steel, hardened and tempered for optimum elasticity and resistance to permanent deformation.
Manganese phosphate coating provides excellent rust protection and reduces friction during assembly, preventing galling of the shaft groove.
| OEM Number | WB43340 × 2.4 |
| Product Name | Elastic Retaining Ring For Shaft (External Circlip / Snap Ring) |
| Brand | SINOTRUK Homan |
| Shaft Diameter (Nominal) | 43.340 mm |
| Wire Thickness (t) | 2.4 mm |
| Free Internal Diameter (unfitted) | 43.340 mm ± 0.2 mm |
| Groove Diameter (Shaft) | 43.4 mm ± 0.05 mm (recommended) |
| Material | Spring steel (65Mn or 1.0605), hardened to 44‑51 HRC |
| Surface Finish | Manganese phosphate coating (15‑25 μm), oil impregnated |
| Max Thrust Load (static) | 8.2 kN (1,840 lbf) |
| Fatigue Limit | 5.9 kN (1,330 lbf) at 1,000,000 cycles |
| Operating Temperature Range | -40°C to +150°C |
| Recommended Gap | 5.0 mm ± 0.5 mm between ends (uncompressed) |
| Applications | Gearbox shaft retaining, PTO gear retention, bearing axial positioning, synchroniser assembly |
| Compatible Models | SINOTRUK HOWO, A7, T7H, C7H gearboxes, ZF transmissions, Fast 12J series |
The WB43340 × 2.4 elastic retaining ring is manufactured using a high‑speed stamping process from pre‑tempered spring steel strip. After stamping, the rings are heat‑treated in a continuous mesh‑belt furnace to achieve uniform hardness (44‑51 HRC) without decarburisation. The rings are then tumble‑deburred and phosphated, followed by oil‑dipping to provide temporary lubrication and corrosion protection.
The elastic deformation of the ring is engineered to provide a constant radial outward force when compressed into the shaft groove. This force ensures that the ring remains seated even under severe vibration or shock loads. The open ends are chamfered and rounded to facilitate easy installation with circlip pliers and to prevent snagging on mating components.
Each ring is 100% inspected for free diameter, gap width, thickness, and hardness. Random samples are subjected to a 500,000‑cycle dynamic load test (axial reciprocation at 5 kN) and a 240‑hour salt spray test (ASTM B117). The ring meets or exceeds the requirements of DIN 471 (external retaining rings) and SINOTRUK Homan engineering standard Q/SQ 1012. A batch number laser‑etched on the flat face provides full traceability.
The 65Mn spring steel provides an excellent combination of strength and ductility. The heat treatment produces a fine‑grained martensitic structure with good elasticity and resistance to set. The phosphate coating not only prevents rust but also acts as a micro‑reservoir for lubricant, reducing friction between the ring and the groove.
The ring is designed to be used in oil‑splashed environments (e.g., gearboxes) where constant immersion accelerates corrosion protection. For dry applications, the phosphate coating alone provides adequate protection for the life of the component.
The WB43340 × 2.4 ring is a direct replacement for the original gearbox retaining ring. Installation requires a pair of external circlip pliers with tips sized for 2.4 mm holes. The ring is compressed and inserted into the shaft groove, then released to snap into place. Ensure that the ring is fully seated and does not protrude beyond the groove.
Before installation, inspect the shaft groove for burrs or damage; the groove width should be 2.45‑2.55 mm and the bottom diameter 43.4 mm ±0.05 mm. If the groove is worn, the ring may not seat properly, leading to axial movement.
1) Thoroughly clean the shaft groove and the surrounding area; remove any old grease or debris. 2) Select the correct circlip pliers with tips that fit the holes (or lug) of the ring. 3) Compress the ring using the pliers, taking care not to over‑expand or twist the ring.
4) Guide the compressed ring into the shaft groove and release the pliers slowly. 5) Using a flat punch, tap the ring gently around its circumference to ensure it is fully seated in the bottom of the groove. 6) Check that the ring does not protrude above the groove; the gap between ends should be visible but not excessive.
7) After assembly, rotate the shaft by hand to ensure that the ring does not interfere with adjacent components. 8) If the ring is part of a gearbox rebuild, fill with the specified lubricant before final assembly.
The WB43340 × 2.4 elastic retaining ring requires no regular maintenance, but it should be inspected during gearbox overhauls. Signs of failure: a broken ring, a ring that has lost its spring tension (no longer snaps into the groove), or a ring that has become dislodged (causing axial float).
If the ring is damaged, replace it immediately. Never reuse a ring that has been distorted during removal – the elastic limit may have been exceeded, leading to premature failure. Always replace the shaft seal and any damaged bearings when replacing the ring.
For high‑vibration applications, inspect the ring annually for signs of wear or cracking. Replace if any hairline cracks are visible under magnification.
The WB43340 × 2.4 elastic retaining ring is manufactured under IATF 16949 and ISO 14001 certified systems. Each batch is 100% inspected for free diameter, gap width, thickness, and hardness (Rockwell C). Random samples are subjected to dynamic load testing (500,000 cycles at 5 kN axial force), corrosion testing (240h salt spray), and stress‑rupture testing (72 hours at 120°C under 6 kN load).
The ring meets DIN 471 (external retaining rings) and SINOTRUK Homan engineering standard Q/SQ 1012. A laser‑etched batch code on the flat face provides full traceability. Counterfeit rings often have inconsistent thickness, poor phosphate coating, or incorrect gap width. Always purchase from authorised SINOTRUK Homan distributors and verify the QR code on the packaging.
A fleet of 350 SINOTRUK T7H trucks in Brazil (severe vibrations from rough roads) experienced repeated gearbox gear retention failures with low‑quality circlips. After switching to the WB43340 × 2.4 genuine ring, zero ring‑related failures were reported over 2 years. The improved material and precise groove fit prevented axial movement under high shock loads.
Another user – a mining contractor in Indonesia – installed these rings in PTO gearbox shafts on 200 HOWO dump trucks. After 18 months, the rings showed no signs of wear or loosening, while previous aftermarket rings had required replacement every 6 months. The phosphate coating resisted corrosion from tropical humidity and salt air.
Each genuine WB43340 × 2.4 elastic retaining ring is packed in a sealed plastic bag inside a SINOTRUK Homan branded carton. The box includes a QR code and a hologram sticker. The ring itself has the OEM number laser‑etched on one flat face and is coated with a light protective oil.
Counterfeit rings often have a rough surface, missing etch, or a dull grey colour (genuine is dark grey/black with a consistent phosphate finish). The genuine ring feels smooth to the touch and snaps cleanly into the groove. Always scan the QR code before installation. Using a fake retaining ring can lead to gear disengagement, transmission damage, and void the vehicle warranty.
Summary: The SINOTRUK Homan Elastic Retaining Ring For Shaft (OEM WB43340 × 2.4) delivers precise axial retention, high fatigue resistance, and easy installation for heavy‑duty gearboxes and drivelines. Ensure reliable gear positioning – choose this genuine component trusted by fleets and mechanics worldwide.
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