7731 Firestone Style 131 Air Bag 1/4NPTF Offset 22mm One Convoluted
Airride Air Spring
Cross Reference
Air spring supplier: Firestone
Reference: Style 131 air spring
The detail specifications
Top cover mounting thread: 2pcs × 3/8-16UNC
Bottom cover mounting thread: 2pcs × 3/8-16UNC
The distance between the two mounting threads: 44.5mm
The air inlet/ air hole/ air fittings/ portsize: 1/4 NPTF
The air hole is 22mmm away from the screw center on top cover
The top cover plate diameter: 115mm
The bottom cover plate diameter: 115mm
The min. height: 50mm
The max. height: 115mm
The max. rubber bellow: 165mm
Bumper block/ bumper: without
Girdle hoop/Girdle ring/belt loop: without
Min. pressure: 0 bar
Return force to min. height: ≤200N
Overall weight with clamped plates: 1.2kg
Vibration isolation - dynamic characteristic values
Design height H: recommended 90mm, minimum 70mm
| Pressure P [bar} | 3 | 4 | 5 | 6 | 7 | 8 | Vol. [V] |
| Force(load) [KN] | 2.7 | 3.7 | 4.7 | 5.7 | 6.6 | 7.7 | 0.9 |
| Spring rate [N/cm] | 1040 | 1270 | 1530 | 1770 | 2060 | 2325 |
| Natural frequency [Hz] | 3.1 | 2.9 | 2.9 | 2.8 | 2.8 | 2.7 |
Pneumatic application- static characteristic values
Force F[kn]
| Pressure p [bar] | 3 | 4 | 5 | 6 | 7 | 8 | Vol. [l] |
| Height H [mm] | 100 | 2.2 | 3.1 | 4.0 | 4.8 | 5.7 | 6.6 | 1.0 |
| 90 | 2.7 | 3.6 | 4.6 | 5.6 | 6.5 | 7.5 | 0.9 |
| 80 | 3.1 | 4.1 | 5.1 | 6.2 | 7.3 | 8.3 | 0.8 |
| 70 | 3.4 | 4.5 | 5.6 | 6.7 | 7.9 | 9.0 | 0.7 |
| 60 | 3.6 | 4.8 | 6.0 | 7.2 | 8.4 | 9.5 | 0.6 |
Application
Mold Separator Inflatable Cushion,
Roller Airbag,
Airbag 3D Vibrating Table Pneumatic Tire,
Rubber Vibrating Table,
Sports equipment,
Precision instruments,
Experimental equipment,
Test bench equipment
How to inflate an air spring
One way to inflate air springs (mainly used as Guomat shocks) is to
use an air tank supply valve with an air hose clamp (just like air
hoses are used to inflate tires). Care must be taken to double
check the air pressure in the air spring on a regular basis as air
slowly seeps out of the bladder through the rubber/ply.
Other types
| Firestone style | Firestone Part Number |
| 131 | W01-M58-6155, Blind nuts, 1/4 BSP |
| 131 | W01-358-0127, Socket head aluminum bead rings (bolts, nuts, washers
not included–use M6 cap screws |
| 131 | W01-358-7742 |
| 131 | W01-358-0131, Rubber bellows only |
The drawing of the product
