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For heavy-duty long-haul and high-load operations, the air suspension system is critical to vehicle stability, ride comfort, and cargo safety. As the core load-bearing and cushioning component, the air spring (Air Spring / Air Suspension Spring) directly affects rear-axle height control, impact absorption capability, and overall NVH performance. This article focuses on OEM: 20531987 and covers common cross references 1076418 / 20374511 / 20456156 / 20582214 / 70321695, helping distributors, repair shops, and fleet buyers make fast, accurate sourcing and replacement decisions—while highlighting Hebei Huami’s manufacturing strength in air suspension and rubber composite parts.
The essence of air suspension is to use compressed air as an “elastic medium,” together with a height control valve, ECU (if equipped), air lines, and shock absorbers, to achieve controllable ride height, adjustable load support, and effective impact absorption. The air spring performs four key functions:
Rear axle air springs provide the main support force at static conditions. By matching air pressure with effective load area, they maintain standard ride height. For logistics fleets, stable ride height means:
Stable driveline and frame geometry
More consistent tire contact and braking posture
Easier loading/unloading and trailer coupling
When the air spring loses performance or leaks, abnormal height or left-right tilt may occur, leading to uneven tire wear, drifting handling, and overload on chassis components.
Compared with leaf springs, air springs can significantly reduce the peak shock transfer to the frame:
Mitigates impacts from potholes, joints, and speed bumps
Reduces cab vibration and driver fatigue
Improves vibration environment for trailers and cargo, lowering damage risk
Air springs improve not only comfort but also structural durability. Lower impact loads typically result in:
Reduced fatigue risk at frame, rear axle mounts, and suspension joints
More stable service life for shock absorbers and rubber-metal bushings
Safer transport for sensitive or fragile goods
Under heavy loads, long downhill runs, continuous cornering, and highway cruising, rear axle air spring stability determines whether vehicle attitude remains controllable:
Heavy load requires higher pressure resistance and fatigue performance
Long-haul heat cycling demands better ozone/aging resistance
Harsh roads require higher tear resistance and flex-crack resistance of reinforced cord structure
In international procurement and aftermarket systems, OEM numbers may appear in different formats, such as:
20531987
20 531 987 (segmented format)
2053 1987 (spaced/grouped format)
For inquiries, quotations, and system entry, use “number + keyword” to increase search hit rate, e.g., 20531987 Volvo truck air spring.
This article covers the following alternative OEM numbers:
1076418 / 20374511 / 20456156 / 20582214 / 70321695
In the aftermarket supply chain, “replacement/interchangeable” typically means key factors such as mounting interfaces, stroke range, load class, and air line connection type are compatible. However, different model years/configurations may vary in height valve calibration, end-cap design, or port angle. Final confirmation is recommended via actual part, drawing, or sample.
For rear axle left & right applications, air springs typically must ensure:
Consistent load and rebound characteristics on both sides (avoid body roll imbalance)
Durability under severe duty cycles (high-frequency flexing + long-term fatigue)
Environmental resistance to ozone, oil contamination, mud/water, and temperature swings
Reliable corrosion protection and sealing on metal end caps
Logistics transport: frequent loading/unloading, long mileage, high-speed cruising
Line-haul transport: stable ride height, reduced fatigue and cargo damage
Heavy-load transport: higher pressure and fatigue demands
Regional distribution: frequent start-stop and turning; sensitive to attitude stability
This product is used on Rear Axle, Left & Right. Rear axle air springs often affect the vehicle more directly because rear axle load is strongly linked to trailer/cargo weight, and stability requirements are higher in turns and crosswinds.
Some platforms use the same air spring for both sides; others may differ due to air port direction or bracket structure. Recommended sourcing checks:
Verify air port location and angle (avoid hose stress after installation)
Verify upper/lower end-cap and positioning features (avoid interference or unstable seating)
For fleet spares: build a “VIN/Chassis No. → Part No.” mapping to improve issue efficiency
Rear axle air springs do more than “hold up the vehicle”—they influence:
Roll control: stiffness mismatch magnifies body roll
Braking attitude: rear squat/lift affects braking stability
Tire wear: abnormal height changes alignment and load distribution
Choosing products with consistent characteristics, strong airtightness, and stable fatigue life is key to lowering total cost of ownership (TCO).
A typical truck air spring consists of:
Rubber bellow: holds pressure and provides elastic deformation
Cord reinforcement layer: controls expansion and improves pressure/fatigue resistance
Metal end caps/fittings: ensures reliable mounting and sealing to axle/frame
To match common air suspension environments (ozone, UV, temperature swings, mud/water), materials can be selected or combined:
NR (Natural Rubber): excellent elasticity and fatigue performance; suitable for high-flex applications
CR (Chloroprene Rubber): good weathering and ozone resistance; balanced performance
EPDM: outstanding ozone/aging and temperature resistance for long-term outdoor use
Actual compound selection should match climate, duty cycle, and cost targets. Custom development based on drawings/samples is supported.
The cord layer functions as a “skeleton.” Its angle, ply count, and bonding quality determine:
Anti-bulging capability (controls radial expansion)
Resistance to flex-crack propagation
Structural stability under long-term pressure cycling
For heavy-duty rear axles, reinforcement consistency often matters more than simply increasing hardness.
Ozone/aging resistance: reduces surface cracking risk and extends service life
Low-temperature resistance: reduces brittleness and leak risk in cold climates
High-pressure resistance: maintains integrity under heavy load and shock peaks
These properties come from a combined system: compound formulation, mixing dispersion, curing profile, cord bonding, and forming precision.
Rear axle areas face mud/water, salt spray, and stone impact. Metal end caps typically require:
Surface corrosion protection (coating/e-coating/painting options)
Precision control of sealing surfaces for long-term airtightness
Strong rubber-to-metal bonding to reduce delamination risk
To support procurement systems and logistics search requirements, the following packaging dimensions must be clearly stated:
Package Length: 25 cm
Package Width: 25 cm
Package Height: 27 cm
Packaging expression: 25 × 25 × 27 cm
Air springs are vulnerable to deformation by compression and damage to metal end caps. Single-piece protective packaging (cushioning, dustproof, moisture-resistant as needed) is recommended, with OEM number and installation position marked on the outer carton for warehouse picking and fleet issue.
Clear packaging dimensions help:
Calculate carton count and volumetric weight quickly
Plan shelving and bin locations, improving turnover efficiency
Reduce damage and mis-shipments during transshipment
For distributors and fleets, these “logistics details” directly affect delivery stability and service response speed.
Air spring failures are often progressive—from micro-leaks and fatigue cracking to noticeable performance loss. Typical signals include:
After parking, rear ride height drops, or left-right height differs noticeably and changes in a short time.
Comfort decreases and rear axle “bouncing” becomes obvious, especially on rough roads.
Visible bellow cracking/bulging, or subtle leak sounds (inspect under safe conditions).
Compressor runs more often and system recharges frequently—often indicating a leak in the air circuit or bellow.
Visual inspection: cracks, bulges, end deformation, rubber aging
Driving behavior: reduced height-holding, unstable attitude
System behavior: abnormal refill frequency, warnings/faults (if equipped)
Workshop suggestion: if one side fails, inspect both sides and evaluate paired replacement to reduce comebacks caused by imbalance.
Confirm OEM 20531987 and cross reference compatibility
Inspect packaging/transport damage; ensure end caps are not deformed
Clean mounting seats and sealing surfaces to prevent slow leaks caused by debris
Ensure the air line is fully seated and seals are intact
Avoid twisting, excessive tension, or rubbing against sharp edges
Perform an airtightness check after connection (use standard procedures)
After installation, verify ride height per the service specification (and calibrate height valve/sensors if needed) to ensure left-right consistency and prevent long-term.
Check bellow surface for aging, cracking, and abnormal rubbing points
Inspect air line routing and fixation to prevent “abrasion → micro-leak → frequent refills”
In winter/salt regions, improve end-cap corrosion prevention and cleaning routines
Avoid sustained overload operation
Fix air circuit leaks promptly to reduce compressor overload and pressure fluctuation
Replace at early crack stages to prevent roadside failures and secondary damage
Hebei Huami New Material Technology Co., Ltd. specializes in rubber products and rubber composite manufacturing. For commercial vehicle chassis and air suspension applications, we provide stable, consistent mass-production delivery capability.
With long-term industrial manufacturing experience, we maintain a complete process chain from formulation, mixing, forming to testing—enabling material/structure optimization for different climates and duty cycles.
For high-turnover aftermarket parts, we build traceable quality and delivery systems to meet distributor stocking and fleet maintenance needs.
IATF 16949 quality management system (subject to your current certificate scope)
TÜV certification support
AEO Advanced Certification: improves customs clearance and supply chain stability
NR / CR / EPDM material systems available
Cord reinforcement design and bonding processes optimized to target life and load requirements
Supports drawing/sample-based development, prototyping, and small-batch validation
Standardized process parameters and in-process control reduce batch variation—improving the two biggest concerns for distributors and fleets: consistency and lower comeback risk.
Airtightness testing
Burst pressure testing
Fatigue life testing
High/low temperature cycling, ozone aging
Dynamic durability testing
Inspection records/sample test reports can be provided per mutually confirmed standards.
Supports OEM / ODM / small-batch customization
Stable lead time and export supply support
Packaging and labeling can be customized for warehouse systems (neutral or branded packaging)
| Item | Specification / Description |
|---|---|
| OEM No. | 20531987 |
| Alternative OEM No. | 1076418 / 20374511 / 20456156 / 20582214 / 70321695 |
| Installation Position | Rear Axle, Left & Right |
| Vehicle Application | Volvo Trucks (exact model/year depends on actual fitment) |
| Product Type | Truck Air Spring / Air Suspension Spring |
| Package Size | 25 × 25 × 27 cm (L25 cm × W25 cm × H27 cm) |
| Material | NR / CR / EPDM (optional) + multi-layer cord reinforcement + steel end caps |
| Corrosion Protection | End-cap anti-corrosion treatment (options available per requirement) |
A: OEM 20531987 is commonly used as a rear axle (left & right) truck air spring for Volvo Trucks, a key load-bearing and cushioning component in the air suspension system.
A: These numbers commonly appear as aftermarket cross references and may be compatible in key interfaces and application conditions. However, variations can exist across models/years, so confirmation by part, drawing, or sample is recommended.
A: Typical symptoms include abnormal ride height or lean, harsher ride, visible cracking/bulging, and frequent system re-inflation.
A: If leaking is continuous or ride height cannot be maintained, replacement is recommended. Ongoing leakage increases compressor duty, system overload risk, and can lead to instability and uneven tire wear.
A: Workshops usually recommend at least inspecting both sides. If the other side is near end-of-life, paired replacement helps reduce comebacks and maintains left-right consistency.
A: Perform an airtightness check, ensure air line routing avoids twisting/rubbing, and verify ride height consistency; calibrate the height valve/sensors if required by service procedures.
A: Main factors include overload, road impact, ozone/temperature swings, pressure fluctuation caused by air circuit leaks, and abrasion due to improper installation.
A: It supports procurement and logistics search, volumetric weight calculation, packing optimization, and warehouse bin planning—improving export delivery and stocking efficiency.
A: We support OEM/ODM, small-batch trials, and drawing/sample-based customization, and can align packaging/labeling with customer warehouse coding systems.
