Your Professional Spare Parts Supplier
Our goal is to become your true partner in the field of air suspension China. Shandong Paisen Machinery Manufacturing Co., Ltd. is a leading manufacturer specializing in high-precision mechanical parts, hydraulic components, and industrial machinery equipment. We have a skilled engineering team dedicated to refining every stage, from product development and process improvement to production oversight, ensuring every product delivered meets rigorous quality and performance standards. The price is competitive and the product is quality-assured, which is a good choice for your long-term cooperation.
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![Suspension Mounting Bracket]()
Suspension Mounting BracketEngineered for maximum load-bearing capacity, our Suspension Mounting Bracket provides critical structural support for air and mechanical suspension systems. Precision-fabricated from high-tensile steel, this component ensures proper...view more -
![Hex Lock Nut]()
Hex Lock NutEngineered for maximum security in high-vibration environments, our Heavy-Duty Hex Lock Nut ensures critical fasteners stay securely tightened, even under extreme loads. Manufactured from high-grade alloy steel and featuring...view more -
![L Stop Plate]()
L Stop PlateEngineered for superior load security and structural integrity, our L-Stop Plate is a critical reinforcement component for semi-trailer suspension and axle systems. Made from high-tensile steel, this precision-formed plate prevents...view more -
![Hex Head Bolt]()
Hex Head BoltDesigned for maximum strength and reliability, our Heavy-Duty Hex Head Bolt is engineered to withstand the toughest conditions in commercial trucking. Manufactured from high-tensile alloy steel, these bolts provide superior clamping...view more -
![Shock Absorber Bolt]()
Shock Absorber BoltEngineered to withstand extreme vibration and dynamic loads, our Shock Absorber Bolt is precision-crafted for optimal performance in heavy-duty trailer applications. Manufactured from heat-treated alloy steel, this critical fastener...view more -
![Fifth Wheel Shim Plate]()
Fifth Wheel Shim PlateEngineered for precision fifth wheel alignment, our Shim Plate System eliminates uneven wear and improves tractor-trailer coupling performance. CNC-machined from high-grade alloy steel, these laser-verified shims provide...view more -
![Shock Absorber Washer]()
Shock Absorber WasherPrecision-engineered for vibration-intensive applications, our Shock Absorber Washer delivers unmatched durability in trailer suspension systems. Manufactured from heat-treated chromium steel, this critical component ensures proper load...view more -
![Axle Shock Absorber]()
Axle Shock AbsorberEngineered for superior vibration control, our Axle Shock Absorber delivers unmatched damping performance in heavy-haul applications. Utilizing nitrogen-charged twin-tube technology, this premium shock maintains consistent stability...view more -
![Leaf Spring Guide Plate]()
Leaf Spring Guide PlateThe Leaf Spring Guide Plate is a critical suspension component designed to maintain precise alignment and stability of leaf springs in heavy-duty semi-trailers. Manufactured from high-grade steel or reinforced alloys, this guide plate...view more -
![Air Spring U-bolt Assembly]()
Air Spring U-bolt AssemblyEngineered for maximum clamping security in air suspension systems, our Air Spring U-Bolt Assembly provides vibration-resistant mounting for critical load-bearing components. CNC-formed from high-tensile alloy steel, this complete kit...view more -
![Air Spring]()
Air SpringThe Air Spring (also known as an airbag or pneumatic suspension spring) is a vital component in modern semi-trailer suspension systems. Designed to replace traditional steel springs, it uses compressed air to absorb road shocks,...view more -
![Air Chamber Base Plate Bolt]()
Air Chamber Base Plate BoltEngineered for critical brake system security, our Air Chamber Base Plate Bolt provides fail-fast fastening for commercial trailer brake chambers. Manufactured from heat-treated alloy steel, this specialized bolt maintains precise...view more
Why Choose Us
Customized Solutions
We understand that every client's needs are different, so we offer customized services. Our engineers will assist you in selecting suitable components based on your specific requirements and tailor-made design solutions according to your unique operational needs.
Production Equipment
Our company has 2 laser cutting machines, 8 stamping machines, 12 CO2 welding machines, 2 sawing machines, 1 CNC milling machine, 2 automatic welding machines, 2 welding robots, and 1 spray painting production line.
Quality Control
Our company strictly controls product quality, with rigorous inspection procedures. We use spectrometers, coordinate measuring machines, and pressure tests to ensure the durability and performance of our products.
Production Market
Our products are well-received in the market and are exported to North America, the Middle East, South Africa, and other countries and regions.
The spare parts produced by our company mainly include the following types:
Hex Head Bolt
Designed for maximum strength and reliability, our heavy-duty hex head bolt is engineered to withstand the toughest conditions in commercial trucking. Manufactured from high-tensile alloy steel, these bolts provide superior clamping force and vibration resistance, ensuring critical components stay securely fastened.
Axle Shock Absorber
Engineered for superior vibration control, our axle shock absorber delivers unmatched damping performance in heavy-haul applications. Utilizing nitrogen-charged twin-tube technology, this premium shock maintains consistent stability across all load conditions (-40°f to +300°f). The precision-machined piston rod and high-viscosity fluid reduce axle hop by up to 45%, protecting tires and cargo from road shock damage.
Advantages of Spare Parts
Hex Head Bolt
Hex head bolt have many advantages, including:
High strength: Hex bolts are known for their strength and durability, capable of withstanding heavy loads, which is ideal for industrial and construction projects.
Corrosion and high-temperature resistance: They can be made from corrosion-resistant materials like stainless steel and are suitable for high-temperature applications, such as in automotive assembly.
Vibration resistance: The design of hex bolts provides good resistance to vibration.
Easy to install and remove: The hexagonal head provides a large, flat surface that is easy to grip with a wrench or socket, making installation and removal efficient.
Tool compatibility: The design is compatible with standard tools, making it a practical choice for many applications.
Axle Shock Absorber
Axle shock absorber have many advantages, including:
Enhanced comfort: Shock absorbers absorb vibrations from rough roads, providing a smooth ride.
Improved stability: By preventing excessive bounce, shock absorbers enhance vehicle stability, especially around corners.
Increased safety: With better handling and stability, shock absorbers contribute to safer driving experiences.
Hex Head Bolt
Hex head bolt can be used for a variety of purposes, including: Hex bolts are used in many industries, including construction, machinery, and manufacturing, and can be used to join different materials like metal, wood, and plastic.
Axle Shock Absorber
Axle shock absorber can be used for a variety of purposes, including:
Passenger vehicles: They absorb vibrations from road surfaces, provide a smoother and more comfortable ride, and prevent excessive bouncing. They also maintain tire contact for improved handling and braking.
Trailers and caravans: They are used to prevent excessive swaying and instability, especially in car transporters, and to dampen impacts when the trailer is being tipped. This improves the stability of the trailer and the comfort of the ride.
Commercial vehicles: They are a standard component on commercial vehicles like trucks, buses, and vans to manage heavy loads and ensure safe operation.
Heavy-duty trucks and SUVs: Axle shock absorbers are crucial for controlling the significant weight and motion of the axles on trucks and SUVs.
Specification of Hex Head Bolt
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Thread Sizes |
M10-M24 / 3/8"-1" |
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Tensile Strength |
120,000 psi (min) |
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Finish Options |
Zinc-plated, black oxide, hot-dip galvanized |
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Lengths |
20mm-200mm (custom lengths available) |
Features of Hex Head Bolt
High-strength construction
Grade 8.8 / grade 5 (ISO 898-1 / sae j429). Heat-treated for durability (rockwell b 80-95). Rolled threads for superior fatigue resistance.
Corrosion & wear resistance
Zinc-nickel plating (ISO 4042 compliant). Salt-spray tested (1000+ hours per astm b117). Self-lubricating threads reduce friction during installation.
Secure fastening performance
Full shank design for even load distribution. Precision machined hex head (wrench-friendly). Torque-to-yield capable for critical applications.
Specification of Axle Shock Absorber
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Body Diameter |
2.5" (63mm) heavy-wall construction |
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Stroke Length |
10"-14" (customizable) |
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Pressure |
300psi nitrogen charge |
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Fluid Type |
Synthetic 20W shock oil |
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Mount Style |
Eyelet/stud combinations |
Features of Axle Shock Absorber
Advanced damping technology: Velocity-sensitive valving (3-stage adjustment). Teflon-coated piston rings. Thermal compensation chambers.
Durability enhancements: Hard-chrome plated rod (0.003" thickness). Double-seal design with dust shield. Forged steel mounts (grade 10.9).
Packing and Shipping of Spare Parts
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Packing |
Tray |
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Shipping |
Shipped by road, sea, rail |
