An uncompressed Air Bag

Air springs offer many other user-friendly advantages over the traditional leaf and coil springs.

A compressed Air Bag

The gas is air and the container is a sealed fabric-reinforced rubber bellow or sleeve. Similar to a ball inflated with air, the load an air spring will carry depends on its diameter and therefore, the area of the column of air supported and the pressure of air inside it.

A cross-section of a compressed Air Bag

The ability to change the load carrying capacity simply by changing the air pressure, rather than changing out the spring, is a major advantage air springs have over steel. Because an air spring consists of a closed volume of air, the compression of the air spring (jounce travel) will cause an increase in pressure, while the extension of the air spring (rebound travel) will cause a decrease in pressure.


A cross section of a firestone convoluted air bag
  1. Blind Nut

    A permanent part of the bead plate assembly providing an alternate mounting system to the stud.

  2. Air Fitting Hole

    A tapped hole usually 1/4" N.P.T. providing air entrance for the part.

  3. Bead Plate

    Permanently crimped onto the bellows at the factory allowing complete part leak testing prior to shipment.

  4. Bellows

    The heart of an Airide spring. Includes at least four plies, or layers, of material–an inner layer, two plies of cord-reinforced fabric, and an outer layer.

  5. Girdle Hoop

    A ring between the convolutions of the convoluted type air spring.

Part #: W01-358-3400 Firestone Double Convoluted Air Spring - W01-358-3400
Genuine Firestone replacement air spring W01-358-3400. Firestone air bag 3400 is designed to provide years and thousands of miles of trouble free service.
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Part #: W01-358-3402 Firestone Double Convoluted Air Spring - W01-358-3402
Genuine Firestone replacement air spring W01-358-3402. Firestone air bag 3402 is designed to provide years and thousands of miles of trouble free service.
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Part #: W01-358-3406 Firestone Double Convoluted Air Spring - W01-358-3406
Genuine Firestone replacement air spring W01-358-3406. Firestone air bag 3406 is designed to provide years and thousands of miles of trouble free service.
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Part #: W01-358-6789 Firestone Double Convoluted Air Spring - W01-358-6789
Genuine Firestone replacement air spring W01-358-6789. Firestone air bag 6789 is designed to provide years and thousands of miles of trouble free service.
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Part #: W01-358-6799 Firestone Double Convoluted Air Spring - W01-358-6799
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Part #: W01-358-6800 Firestone Double Convoluted Air Spring - W01-358-6800
Genuine Firestone replacement air spring W01-358-6800. Firestone air bag 6800 is designed to provide years and thousands of miles of trouble free service.
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Part #: W01-358-6801 Firestone Double Convoluted Air Spring - W01-358-6801
Genuine Firestone replacement air spring W01-358-6801. Firestone air bag 6801 is designed to provide years and thousands of miles of trouble free service.
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Part #: W01-358-6803 Firestone Double Convoluted Air Spring - W01-358-6803
Genuine Firestone replacement air spring W01-358-6803. Firestone air bag 6803 is designed to provide years and thousands of miles of trouble free service.
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