BUS 014 - Firestone Industrial Products
BUS 014 - Firestone Industrial Products
BUS 014 - Firestone Industrial Products
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Airide<br />
springs<br />
Double Convoluted<br />
Convoluted Style<br />
Single Convoluted<br />
<strong>Firestone</strong> convoluted Airide springs are available in two<br />
styles, single or double convoluted, as shown above.<br />
To identify the exact style and part number to replace your<br />
current air spring, you need to identify the type of bellows,<br />
bead plates, and attaching hardware used, as well as<br />
determining whether the spring has an internal bumper.<br />
First, look for the manufacturer’s part number and <strong>Firestone</strong><br />
order number stamped in ink on the bead plate. If illegible,<br />
read the part number molded on the bellows, normally under<br />
the <strong>Firestone</strong> name. If the number (20, 22, etc.) is present,<br />
simply refer to the proper section of this guide.<br />
If for any reason the number is unreadable, you can<br />
determine the bellows type with a simple measurement.<br />
Remove the air entrance and allow the bellows to assume its<br />
normal shape. Then measure the outer diameter of the<br />
bellows as shown below. Compare this diameter with those<br />
listed in this guide under either single or double convoluted<br />
springs (according to which type you have).<br />
To determine the presence of an internal bumper in the spring,<br />
remove the air and collapse the spring to its minimum height.<br />
Then measure this height as shown below. With this<br />
measurement you can then contact <strong>Firestone</strong> or your distributor<br />
to determine if a rubber bumper exists.<br />
Finally, to complete the parts identification, compare the<br />
metal bead plates and attaching hardware with the<br />
assemblies detailed in that same section of the guide.<br />
For your convenience, typical types of attaching hardware<br />
are illustrated below. Studs will be either 1/2-13 or 1/2-20. Air<br />
fittings will be 1/4 or 3/8 N.P.T. Combination air fittings/studs<br />
will be 3/4-16, with a 1/4 N.P.T. air entrance. Blind nuts or<br />
tapped holes will be 3/8-16. The special bolts used on the<br />
bead ring type parts will be 3/8-16 or 3/8-24.<br />
Standard bolt or stud<br />
Bead plate<br />
Tapped hole (blind nut)<br />
Bead plate<br />
Compressed<br />
height<br />
Combination stud–<br />
air fitting<br />
Bead ring type part<br />
Bellows diameter<br />
Bead<br />
plate<br />
Air fitting<br />
Bead plate<br />
Bead ring<br />
Counter<br />
sunk bolt<br />
5/16 x 24<br />
4
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