Your Professional Upper 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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Heavy-Duty Door HingeOur Heavy-Duty Door Hinges are engineered to withstand the rigorous demands of commercial trailer operations. Designed for durability and smooth operation, these hinges ensure secure and long-lasting performance for all types of trailer...view more
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Container LockOur commercial-grade container locks provide robust protection for semi-trailer cargo doors, offering superior theft prevention and weather resistance. Engineered for the transportation industry, these high-security locks withstand...view more
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Fifth Wheel KingpinOur heavy-duty fifth wheel kingpins form the vital link between your tractor and trailer, engineered to handle the most demanding road conditions. Built for professional trucking operations, these kingpins deliver unmatched reliability...view more
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Side Marker LightOur commercial-grade side marker lights provide critical visibility for semi-trailers, ensuring compliance with transportation safety regulations while improving road presence. Designed for professional fleet use, these durable lights...view more
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Reverse LedOur Reverse LED Lights provide superior illumination for semi-trailers, ensuring safe maneuvering in low-light conditions. Designed for truck drivers and fleet operators, these high-performance lights enhance visibility during...view more
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Rubber Bumper BlockOur commercial-grade rubber bumper blocks absorb shock and prevent damage during trailer docking and loading operations. Engineered for long-lasting performance, these resilient bumpers protect both trailers and loading docks from...view more
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Lashing HookOur Lashing Hooks are built to withstand the toughest cargo-securing challenges in the transportation industry. Designed for semi-trailers and heavy-duty trucks, these robust hooks provide reliable tie-down points for straps, chains,...view more
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Ratchet Tie-DownOur Ratchet Tie-Down Straps are built for professional truckers and fleet operators who demand reliable cargo control. These heavy-duty straps combine industrial-strength webbing with smooth-operating ratchets to keep loads securely...view more
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Hand Control ValveOur heavy-duty hand control valves give drivers complete command over trailer braking systems. Designed for commercial vehicle applications, these reliable valves ensure smooth, responsive braking performance in all operating conditions.view more
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Underbody ToolboxOur rugged Underbody Toolbox provides weatherproof storage for tools, chains, and equipment on semi-trailers. Mounted beneath the trailer frame, this durable compartment keeps essential gear protected while maximizing cargo space.view more
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Air Reservoir TankOur Air Reservoir Tanks are essential components for maintaining optimal air pressure in semi-trailer braking systems. Built to withstand harsh road conditions, these durable tanks ensure consistent air supply for safe and efficient...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 upper produced by our company mainly include the following types:
Rubber Bumper Block
Our commercial-grade rubber bumper blocks absorb shock and prevent damage during trailer docking and loading operations. Engineered for long-lasting performance, these resilient bumpers protect both trailers and loading docks from costly impact damage.
Ratchet Tie-Down
Our ratchet tie-down straps are built for professional truckers and fleet operators who demand reliable cargo control. These heavy-duty straps combine industrial-strength webbing with smooth-operating ratchets to keep loads securely fastened, even on rough roads and long hauls.
Advantages of Upper
Rubber Bumper Block
Rubber bumper block have many advantages, including:
Shock absorption: They act as a cushion, absorbing impact and protecting both the vehicle and the structure from damage during collisions.
Weather-resistant: Made from high-density rubber, they are resistant to water, UV rays, and extreme temperatures, making them suitable for both indoor and outdoor use.
Long-lasting: They are durable and long-lasting, often made from reprocessed rubber, and do not rust or corrode like steel bumpers.
Low maintenance: They are very low maintenance and easy to clean.
Easy to install: They can be installed quickly and easily using bolts or screws on various surfaces like concrete or asphalt.
Flexible: The material's flexibility allows it to conform to slightly uneven surfaces.
Ratchet Tie-Down
Ratchet tie-down have many advantages, including:
Superior security: The ratchet mechanism provides exceptional tension control, keeping even very heavy loads securely fastened during transit, which is crucial for preventing accidents.
High strength: Made from durable, high-strength materials like polyester, these straps are designed for industrial-grade use and can withstand significant force and stress.
Versatility: Ratchet straps can be used for a wide range of applications, from transporting vehicles to securing lumber and other equipment.
Ease of use: The intuitive ratchet system allows for quick and efficient tightening and loosening with minimal effort, saving time compared to other methods.
Rubber Bumper Block
Rubber bumper block can be used for a variety of purposes, including: Rubber bumper blocks are used for collision protection, shock absorption, and to prevent damage in various settings like loading docks, parking garages, and industrial areas. They are installed to protect vehicles, buildings, and equipment from impact by absorbing shock and reducing the force of collisions. Other applications include use in home garages for parking, and in industrial or agricultural equipment.
Ratchet Tie-Down
Ratchet tie-down can be used for a variety of purposes, including: Ratchet tie-downs are primarily used for securing cargo during transport in various fields like construction, professional moving, and recreational activities. Common applications include securing ATVs, motorcycles, lumber, and kayaks, as well as being used in industrial settings to hold heavy equipment and on flatbed trucks for professional cargo.

Specification of Rubber Bumper Block
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Material |
High-density molded rubber compound |
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Size Options |
6"x6" to 12"x12" (standard sizes) |
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Thickness |
2" to 4" (custom options available) |
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Mounting |
Pre-drilled holes for easy installation |
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Color |
Standard black (other colors optional) |
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Temperature Range |
-40°F to +180°F (-40°C to +82°C) |
Features of Rubber Bumper Block
Shock-absorbing design reduces structural stress. Weather-resistant rubber withstands outdoor conditions. Non-marking surface protects painted areas. Slotted drainage prevents water accumulation. Replaceable wear pads for extended service life.
Specification of Ratchet Tie-Down
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Working Load Limit |
5,000–10,000 lbs (2,270–4,540 kg) |
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Webbing Material |
High-tensile polyester (UV & abrasion resistant) |
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Ratchet Mechanism |
Zinc-plated steel with ergonomic handle |
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End Hooks |
Forged steel with safety latch (S-hook or flat hook options) |
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Strap Length |
10–30 ft (3–9 m) standard lengths |
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Width |
2–4 inches (5–10 cm) |
Packing and Shipping of Upper
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Packing |
Tray |
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Shipping |
Shipped by road, sea, rail |
We're well-known as one of the leading upper manufacturers and suppliers in China. Our factory offers high quality upper made in China with competitive price. Welcome to contact us for quotation.
ar44 axles, go kart spindle, 17 hub caps
