FD Type Double Bellows Air Spring
FD Type Edge-wrapped plate integrated rubber air spring

Frequently Asked Questions
What are the benefits of using a FD-Type Rubber Air Spring?
FD-Type Rubber Air Springs offer a range of benefits that make them highly suitable for industrial vibration isolation and load-bearing applications:
Excellent Vibration Isolation
The flexible rubber air chamber effectively absorbs and isolates both high- and low-frequency vibrations, reducing noise and protecting sensitive equipment.Adjustable Load and Height
Air pressure inside the spring can be adjusted to accommodate different load conditions, making it ideal for dynamic systems such as HVAC units, compressors, and platforms.Modular Design with Movable Flange
Each FD-type air spring is equipped with a movable flange, allowing the user to easily assemble it with an additional blind plate using bolts. This design makes installation, removal, and replacement of the rubber airbag extremely convenient—especially useful when only the rubber part is damaged.Long Service Life
Made from high-strength, wear-resistant rubber (like neoprene), FD-Type air springs are built for thousands of compression cycles in harsh environments without loss of performance.Low Maintenance
Unlike metal springs, FD air springs operate without metal-to-metal contact, requiring no lubrication and minimal maintenance over time.Compact and Lightweight
The cylindrical design allows for easy integration into tight or limited spaces, while still delivering high load capacity.
How Does the FD-Type Rubber Air Spring Function?
The FD-Type air spring functions by utilizing a rubber airbag that compresses and expands to absorb shocks and vibrations. As a load is applied, the internal air pressure adjusts to match the weight, enabling the air spring to maintain a steady height and efficiently isolate vibrations from external sources. Its design incorporates sealed end plates, eliminating the need for additional components and ensuring easy installation. This construction provides superior vibration dampening and impact absorption, improving comfort and safety. These air springs are ideal for use in various machinery and vehicles, delivering reliable performance in diverse applications.
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What are the applications of the FD-Type Rubber Air Spring?
The FD-Type Rubber Air Spring is used in a wide range of applications, including:
- Mould separation machines (air cushions)
- Roll leveling machines (airbags)
- Three-dimensional vibration tables (air bladders)
- Rubber vibration tables (air cushions)
- Roller friction brake machines (air springs)
- Conveyors (air pads)
- Straightening machines (air springs)
- Vehicle air suspension systems
- Gate valve actuator air springs
- Forming presses (air bladders)
- Cable tensioners (airbags)
- Pipe threading machines (air pads)
- Tobacco machinery (airbags)
- Analytical instruments (airbags)
- Secondary lifting equipment (air bladders)
- Missile transport equipment (air bladders)
- Aircraft airbags
- Trampolines (air cushions)
- High-frequency vibration tables (air bladders)
This demonstrates the versatility of the FD-Type Rubber Air Spring across various industries and machinery types.
Do Not Exceed the Recommended Safe Extended Height: When installing or using an air spring, ensure that it is not extended beyond the recommended height. Exceeding this height could lead to excessive strain on the air spring, resulting in damage or reduced performance over time. Always follow the manufacturer’s guidelines regarding the safe extended height for proper operation.
Avoid Using Below the Minimum Compressed Height: To prolong the lifespan of the air spring, it is crucial not to operate it below its minimum compressed height. Operating below this threshold can cause the rubber bladder to become overstretched, leading to premature wear and potential failure. Ensure the air spring is within the correct compression range during use.
Do Not Use at a Pressure Exceeding 0.7 MPa: The air spring must be operated within the specified pressure limits to maintain optimal performance and safety. Exceeding a pressure of 0.7 MPa could lead to over-stretching of the air spring, compromising its structural integrity. Always check and regulate the air pressure according to the manufacturer’s recommendations.
Avoid Twisting the Air Spring: During installation and use, it is important to avoid twisting the air spring. A twisted air spring can lead to uneven distribution of air pressure, causing internal damage or even failure. Make sure the air spring is installed in a straight and aligned position to ensure proper function and durability.
- The FD-Type air spring is typically available in stock.
- The air springs manufactured by Shanghai Songjiang meet national standards and come with a one-year warranty. Any quality issues can be exchanged within this period.
- There is no purchase quantity limit. Small orders are generally shipped via international couriers such as DHL, FEDEX, UPS, TNT, etc., ensuring fast delivery, usually within 3-7 business days.
FD Type Double Bellows Air Spring Model List:

Model:FD 130/142
Maximum Load:756kg
Maximum Outer Diameter:150mm
Natural Outer Diameter:130mm
Minimum Compressed Height :72mm
Maximum Extended Height :162mm
The weight of the component :4.4kg

Model:FD 160/166
Maximum Load:1251kg
Maximum Outer Diameter:175mm
Natural Outer Diameter:160mm
Minimum Compressed Height :82mm
Maximum Extended Height :190mm
The weight of the component :2.35kg

Model:FD 168/132
Maximum Load:1281kg
Maximum Outer Diameter:185mm
Natural Outer Diameter:168mm
Minimum Compressed Height :72mm
Maximum Extended Height :151mm
The weight of the component :2.2kg

Model:FD 200/142
Maximum Load:1797kg
Maximum Outer Diameter:220mm
Natural Outer Diameter:200mm
Minimum Compressed Height :78mm
Maximum Extended Height :162mm
The weight of the component :3.1kg

Model:FD 230/214
Maximum Load:2941kg
Maximum Outer Diameter:255mm
Natural Outer Diameter:2230mm
Minimum Compressed Height :88mm
Maximum Extended Height :246mm
The weight of the component :4.1kg

Model:FD 235/152
Maximum Load:2493kg
Maximum Outer Diameter:250mm
Natural Outer Diameter:235mm
Minimum Compressed Height :76mm
Maximum Extended Height :174mm
The weight of the component :3.3kg

Model:FD 250/180
Maximum Load:2610kg
Maximum Outer Diameter:270mm
Natural Outer Diameter:250mm
Minimum Compressed Height :84mm
Maximum Extended Height :206mm
The weight of the component:4kg

Model:FD 252/163
Maximum Load:2632kg
Maximum Outer Diameter:275mm
Natural Outer Diameter:252mm
Minimum Compressed Height :80mm
Maximum Extended Height :238mm
The weight of the component :4.2kg

Model:FD 280/214
Maximum Load:4361kg
Maximum Outer Diameter:305mm
Natural Outer Diameter:280mm
Minimum Compressed Height :88mm
Maximum Extended Height :246mm
The weight of the component :5.6kg

Model:FD 290/265
Maximum Load:3479kg
Maximum Outer Diameter:320mm
Natural Outer Diameter:290mm
Minimum Compressed Height :90mm
Maximum Extended Height :303mm
The weight of the component :6.55kg

Model:FD 300/170
Maximum Load:4309kg
Maximum Outer Diameter:320mm
Natural Outer Diameter:300mm
Minimum Compressed Height :85mm
Maximum Extended Height :195mm
The weight of the component :5.35kg

Model:FD 310/214
Maximum Load:5270kg
Maximum Outer Diameter:330mm
Natural Outer Diameter:310mm
Minimum Compressed Height :88mm
Maximum Extended Height :245mm
The weight of the component:7kg

Model:FD 330/214
Maximum Load:5966kg
Maximum Outer Diameter:355mm
Natural Outer Diameter:330mm
Minimum Compressed Height :88mm
Maximum Extended Height :246mm
The weight of the component :7.8kg

Model:FD 330/254
Maximum Load:5762kg
Maximum Outer Diameter:355mm
Natural Outer Diameter:330mm
Minimum Compressed Height :90mm
Maximum Extended Height :295mm
The weight of the component :7.24kg

Model:FD 350/255
Maximum Load:5270kg
Maximum Outer Diameter:330mm
Natural Outer Diameter:310mm
Minimum Compressed Height :88mm
Maximum Extended Height :245mm
The weight of the component:7kg

Model:FD 360/214
Maximum Load:5966kg
Maximum Outer Diameter:355mm
Natural Outer Diameter:330mm
Minimum Compressed Height :88mm
Maximum Extended Height :246mm
The weight of the component :7.8kg

Model:FD 380/221
Maximum Load:5762kg
Maximum Outer Diameter:355mm
Natural Outer Diameter:330mm
Minimum Compressed Height :90mm
Maximum Extended Height :295mm
The weight of the component :7.24kg

Model:FD 350/255
Maximum Load:6381kg
Maximum Outer Diameter:380mm
Natural Outer Diameter:350mm
Minimum Compressed Height :90mm
Maximum Extended Height :295mm
The weight of the component :8.2kg

Model:FD 360/214
Maximum Load:5900kg
Maximum Outer Diameter:380mm
Natural Outer Diameter:360mm
Minimum Compressed Height :88mm
Maximum Extended Height :246mm
The weight of the component :7.9kg

Model:FD 380/221
Maximum Load:7697kg
Maximum Outer Diameter:405mm
Natural Outer Diameter:380mm
Minimum Compressed Height :90mm
Maximum Extended Height :255mm
The weight of the component :8.5kg

Model:FD 400/217
Maximum Load:8958kg
Maximum Outer Diameter:430mm
Natural Outer Diameter:400mm
Minimum Compressed Height :90mm
Maximum Extended Height :249mm
The weight of the component :11.1kg

Model:FD 400/255
Maximum Load:8254kg
Maximum Outer Diameter:430mm
Natural Outer Diameter:400mm
Minimum Compressed Height :90mm
Maximum Extended Height :295mm
The weight of the component :10.4kg

Model:FD 430/255
Maximum Load:9838kg
Maximum Outer Diameter:460mm
Natural Outer Diameter:430mm
Minimum Compressed Height :90mm
Maximum Extended Height :295mm
The weight of the component :10.2kg

Model:FD 480/217
Maximum Load:13528kg
Maximum Outer Diameter:510mm
Natural Outer Diameter:480mm
Minimum Compressed Height :90mm
Maximum Extended Height :249mm
The weight of the component :13.8kg

Model:FD 520/217
Maximum Load:14442kg
Maximum Outer Diameter:550mm
Natural Outer Diameter:520mm
Minimum Compressed Height :90mm
Maximum Extended Height :249mm
The weight of the component :14.5kg

Model:FD 580/214
Maximum Load:18191kg
Maximum Outer Diameter:600mm
Natural Outer Diameter:580mm
Minimum Compressed Height :88mm
Maximum Extended Height :246mm
The weight of the component :13.3kg

Model:FD 630/262
Maximum Load:22277kg
Maximum Outer Diameter:660mm
Natural Outer Diameter:620mm
Minimum Compressed Height :90mm
Maximum Extended Height :300mm
The weight of the component :20kg

Model:FD 680/262
Maximum Load:24914kg
Maximum Outer Diameter:710mm
Natural Outer Diameter:680mm
Minimum Compressed Height :90mm
Maximum Extended Height :302mm
The weight of the component :18.6kg