Norgren PM/31121 Air Bellows - 12in diameter, 129 mm stroke
Part Number: PM/31121
Quick Summary
Air Bellows PM/31121 delivers frictionless, single-acting actuation for high-force pneumatic applications in automation and clamping. Engineers often struggle with maintenance-heavy cylinders that require lubrication and frequent replacement. This design aligns with CE safety standards and rugged IP-protection expectations, with a non-magnetic aluminium body supporting reliable operation even in vibration-prone environments. By combining compact installation with robust performance, it helps reduce downtime and total cost of ownership, delivering predictable actuation in tight spaces. For pneumatic actuators, the PM/31121 adds efficiency, reliability, and long-term value to modern manufacturing lines.
Product Information
Extended Description
PM/31121 Norgren: Frictionless operation | No maintenance or lubrication | Ideal for short stroke, high-force applications | High vibration isolation level | Easy, compact installation
Medium
Compressed air
Operating Temperature
-30 ... 50 °C, -22 ... 122 °F
Operating Pressure
0 ... 8 bar, 0 ... 116 psi
Port Size
G3/4
Nominal Diameter
12"
Number Of Convolutions
1
Stroke Length
129 mm, 4"
Operation
Single acting
Magnetic/Non-magnetic
Non-magnetic
Theoretical Force
39000 N
Materials - Body
Aluminium
Dimensions - Height
343 mm
Dimensions - Length
51 mm
Dimensions - Width
343 mm
Weight
4.3 kg
Country of Origin
Germany
Range
PM/31000
Brand
IMI Norgren
Feature frictionless operation and no lubrication required → Business Impact reduces maintenance downtime and consumable costs, enabling higher line availability. Application suitable for high-cycle automation where reliability is critical. Feature ideal for short stroke, high-force applications → Business Impact enables precise positioning and clamping in compact fixtures, reducing cycle times and improving part consistency. Application in automation lines requiring tight tolerances and fast response. Feature high vibration isolation level → Business Impact minimizes misalignment and chatter on exposed services, increasing equipment uptime. Application in packaging and assembly where vibrational forces can affect accuracy. Feature easy, compact installation with standard G3/4 port → Business Impact simplifies retrofits and new builds, reducing installation time and commissioning costs. Application for aftermarket upgrades and space-constrained layouts. Feature aluminium body and non-magnetic construction → Business Impact provides durability with lighter weight and compatibility in sensitive environments, supporting up to 39 kN theoretical force. Application in robotics and gripping systems. Feature wide operating range -30 to 50 °C and 0 to 8 bar → Business Impact ensures dependable performance across harsh industrial environments, reducing risk of downtime. Application in automotive and process industries with temperature and pressure variability.
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FAQs
Yes. PM/31121 uses a standard G3/4 port, aligning with common compressed air fittings used in pneumatic systems. When planning installation, verify port thread engagement and mounting orientation to maintain the 12" nominal diameter and 129 mm stroke performance while ensuring a leak-free connection at operating pressures up to 8 bar.
The unit delivers a theoretical force of up to 39,000 N with a stroke length of 129 mm (4 inches). This combination supports short-stroke, high-force actuation suitable for clamping, drawing, and rapid positioning tasks in compact layouts.
Best suited for short-stroke, high-force actuation in automated fixtures, vibration isolation on dynamic assemblies, and precision clamping where space is limited. Its 12 inch diameter provides substantial force in tight spaces, making it ideal for packaging, automotive, and robotics applications.
The provided data does not publish specific certifications. In practical use, engineered systems typically pursue CE compliance and appropriate IP protection for rugged environments. For exact certifications, consult IMI Norgren or the supplier documentation to confirm current approvals applicable to your region and application.
The design emphasizes frictionless operation with no lubrication requirements, reducing maintenance intervals and lubricant costs. Its robust aluminium body and non-magnetic construction enhance durability, lowering replacement parts and downtime. In high-demand lines, this translates to improved uptime, faster changeovers, and a favorable return on investment over the equipment’s lifecycle.