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Auto Spare Parts Bellows Kit OE 31256225 Inner Half-Shaft Ball Joint Dust Cover for Volvo S40 V50
The Bellows Kit (OE Number: 31256225), specifically designed as an Inner Half-Shaft Ball Joint Dust Cover, is a critical protective component engineered exclusively for Volvo S40 (2004+) and V50 models. Installed over the inner ball joint of the vehicle’s half-shaft (also called the drive shaft), it acts as a flexible, sealed barrier between the ball joint and the external environment. The half-shaft is responsible for transmitting power from the transmission to the wheels, while the inner ball joint allows for angular movement (e.g., when turning or driving over bumps). As an OE-grade kit, it matches Volvo’s original specifications for material flexibility, sealing performance, and fit—ensuring compatibility with the S40/V50’s drivetrain architecture and long-term protection.
This kit features a weatherproof, wear-resistant design tailored to the demands of undercarriage use:
Core Components of the Kit:
Dust Cover (Bellows): A flexible, accordion-style sleeve made of high-grade neoprene or EPDM rubber. These materials offer:
Elasticity: Accommodates the ball joint’s full range of motion (rotation and angular movement) without tearing or restricting movement.
Chemical/Environmental Resistance: Withstands road salt, oil, grease, water, and UV rays—preventing degradation that leads to cracks or leaks.
Sealing Integrity: The bellows’ tight fit (at both ends) blocks debris (sand, gravel, dirt) and moisture from entering the ball joint.
Mounting Clamps/Collars: 2–4 stainless steel or zinc-plated clamps (included in the kit) that secure the bellows to the half-shaft and ball joint housing. These clamps create a permanent, leak-proof seal—avoiding slippage that would expose the ball joint.
Lubricant Packet (Optional): A small tube of lithium-based or molybdenum-disulfide grease (included in most OE kits) for re-lubricating the ball joint during installation. Proper lubrication reduces friction and wear between the ball and its socket.
OE Precision: The bellows’ length, diameter, and accordion folds are factory-calibrated to the S40/V50’s inner ball joint dimensions—ensuring no excess slack (which causes rattling) or tightness (which restricts movement).
Core Functions
Protect the Inner Ball Joint: The primary role of the bellows is to shield the inner half-shaft ball joint from debris (dirt, gravel) and moisture (rain, road salt). Without this protection, debris would grind against the ball joint’s metal surfaces, and moisture would cause rust—both leading to premature wear, squeaking, or complete failure.
Retain Lubrication: The sealed bellows traps grease inside the ball joint, ensuring consistent lubrication between the ball and socket. This reduces friction, minimizes heat buildup, and extends the ball joint’s service life (typically 80,000–100,000 miles with proper protection).
Prevent Drivetrain Damage: A failed bellows can lead to ball joint wear, which causes loose half-shaft movement. This looseness may damage the transmission seal, CV joint, or wheel bearings—resulting in costly repairs far beyond the cost of replacing the bellows.
Maintain Driving Comfort: By protecting the ball joint from wear, the bellows prevents squeaking, clunking, or vibration during turns or acceleration—preserving the S40/V50’s smooth driving experience.
Compatible Vehicles
Applicable Models
Applicable Years
S40 (04-)
2004–2012
V50
2004–2012
*For 100% fitment accuracy & proper installation:
Confirm the bellows is for the inner (not outer) half-shaft ball joint—inner and outer bellows have different dimensions, and interchanging them will result in poor sealing. The OE number 31256225 is explicitly for the inner joint of S40/V50 models.
Reference the S40/V50’s official service manual for installation steps: Replacing the bellows requires safely lifting the vehicle, removing the wheel, and accessing the half-shaft. Avoid forcing the half-shaft or ball joint—use proper tools (e.g., a ball joint separator) to prevent damage.
During installation:
Clean the ball joint thoroughly to remove old grease and debris before applying new lubricant (from the kit).
Ensure the bellows is aligned straight on the half-shaft—twisting it will cause tearing during use.
Tighten the mounting clamps to OE-specified torque (typically 8–12 N·m) — over-tightening will damage the bellows, while under-tightening will cause leaks.
Inspect the bellows annually (during oil changes or tire rotations): Look for cracks, tears, or loose clamps—addressing issues early prevents ball joint damage.
Note: This kit is sold as a single unit (for one inner ball joint). For full drivetrain protection, replace the bellows on both left and right inner half-shafts (order two kits if both are worn).*
Frequently Asked Questions
Q: How to determine if the bumper bracket needs replacement?
A: Signs of a failing bumper bracket include visible damage or deformation, misaligned bumper panels, unusual noises from the front end, or if the bumper appears loose or sagging on one side.
Q: What should be paid attention to when replacing the bumper bracket?
A: For optimal results, we recommend professional installation. Key considerations include ensuring proper alignment of all mounting points, checking for additional damaged components, and verifying all fasteners are properly torqued to specification.
Why Choose Our Products
Extensive Industry Experience: 13 years specializing in Volvo auto parts with precise product matching and technical solutions.
Quality Assurance: 10-stage quality inspection process including durability testing, surface roughness analysis, and dimensional verification.
Manufacturing Excellence: 15,000㎡ production base with 10,000+ SKUs in inventory for fast order fulfillment.
Strategic Partnerships: Collaborations with 50+ factories including suppliers to international brands like Bosch and Hella.
Company Profile
Established in Guangzhou China, Womala Auto parts as a comprehensive company with five branches has engaged in Volvo parts for more than 10 years.There are hundreds of professional staff working in our supply department, sales and logistic support departments.Thanks to the deep coop... Company Profile
Established in Guangzhou China, Womala Auto parts as a comprehensive company with five branches has engaged in Volvo parts for more than 10 years.There are hundreds of professional staff working in our supply department, sales and logistic support departments.Thanks to the deep coop...
