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PM/31021 Industrial Air Spring Norgren Air Bellows Single Convolution Nominal Diameter 2-3/4"
PM/31021 Description:
Norgren Imported PM/31021 this kind of triple Convoluted Air Spring which is produced by Norgren. It can replace bellows Number 2-3/4" ; PM/31021 air spring not only use in truck and trailer,but also as Vibratory conveyors,such as Large drying machines,Centrifugal separators,Coordinate measuring tables and machinery and Commercial laundry machines.
PM/31021 Specifications and Detail Technical Parameters
❶Nut / Blind Nut
Top Cover Plate Screw (Nut) Tooth : 6pcs X M10
Bottom Cover Plate Screw (Nut) Tooth : 6pcs X M10
❷ Gas Hole / Air inlet / Air Fitting
Gas Hole / Air inlet : G3/8
❸ Cover Plate
Top Cover Plate Diameter (Width): 154 mm
Bottom Cover Plate Diameter (Width): 154 mm
Material top and bottom plate:steel
❹Rubber Bellows
Diameter max at 7 bar:165MM
Stroke of Rubber Bellows:55 m
❺ Bumper block / Buffer block
Without Bumper Block
❻ Girdle Hoop / Girdle Ring
With Girdle Hoop :no Girdle Hoop
ITEM: PM/31042
Frictionless operation
No maintenance or lubrication
Ideal for short stroke, high-force applications
High vibration isolation level
Easy, compact installation
Operation: Single acting
Stroke length: 80 mm
Port size: G3/8
Nominal diameter: 4-1/2"
Number of convolutions: 2
Medium: Air Compressed
Port size: G3/8
Operation: Single acting
Operating pressure: 0 ... 8 bar
Operating temperature: -30 ... 50 °C
Stroke length: 80 mm
Theoretical force: 5750 N
Range: PM/31000
The drawing of PM/31021:
Other kinds of model air bellows:
| Model | PM/31021 | PM/31022 | PM/31023 | PM/31041 | PM/31042 | PM/31043 | PM/31061 | PM/31062 |
| Cylinder Ø [inch] | 2 3/4" | 2 3/4" | 2 3/4" | 4 1/2" | 4 1/2" | 4 1/2" | 6" | 6" |
| Stroke [mm] | 20 | 45 | 60 | 40 | 85 | 100 | 55 | 115 |
| Air Port | G 1/4 | G 1/4 | G 1/4 | G 3/8 | G 3/8 | G 3/8 | G1/2 | G1/2 |
| Nominal Ø (inch) x convolutions | 2 3/4" x 1 | 2 3/4" x 2 | 2 3/4" x 3 | 4 1/2" * 1 | 4 1/2" * 2 | 4 1/2" * 3 | 6" x 1 | 6" x 2 |
| Installation height min [mm] | 50 | 65 | 80 | 50 | 65 | 100 | 55 | 80 |
| Recomended max working height [mm] | 65 | 105 | 130 | 80 | 135 | 180 | 100 | 170 |
| Installation height max [mm] | 70 | 110 | 140 | 90 | 150 | 200 | 110 | 190 |
| Retracting force to reach min height [N] | 200 | 310 | 300 | 200 | 240 | 140 | 200 | 220 |