Airtac PSB Single Acting Compact Cylinder PSB4X20
The AirTAC Airtac PSB Single Acting Compact Cylinder PSB4X20 is a single acting, push type (spring return) pen-size mini cylinder with a Ø4mm bore and 20mm stroke. A single air port drives the push stroke; the built-in return spring resets the rod when air is released, so only one solenoid line is needed.
- BoreØ4 mm
- Stroke20 mm
- Port sizeM3×0.5 (tube)
- Acting typePush, single acting
- Rod threadM4×0.7
- ReturnSpring
About the Airtac PSB Single Acting Compact Cylinder PSB4X20
The AirTAC PSB4X20 is a single-acting push cylinder with a built-in spring that retracts the rod upon air exhaustion. Air entering the M3x0.5 port extends the slim Ø2 mm rod to deliver 4.1 N of net push at 0.5 MPa. This fail-safe retracted state is ideal for light part ejection or gate returns in tight spaces.
Because the internal spring opposes the stroke, a minimum operating pressure of 0.3 MPa is required before motion begins. The bronze barrel and stainless rod keep the assembly lightweight for delicate end-of-arm tooling. Note that the Ø4 bore has no end cushion or bumper, so external deceleration may be needed for heavier tooling.
Airtac PSB Single Acting Compact Cylinder PSB4X20 Technical Specifications
| Model | Airtac PSB Single Acting Compact Cylinder PSB4X20 |
|---|---|
| Series | PSB JIS pen-size mini cylinder |
| Bore size | Ø4 mm |
| Rod diameter | Ø2 mm |
| Stroke | 20 mm |
| Acting type | Single acting, push type (spring return) |
| Port size | M3×0.5 (tube) |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.3 – 0.7 MPa |
| Proof pressure | 1.2 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 50 – 500 mm/s |
| Return | Return spring (push by air) |
| Max standard stroke | Up to 60 mm |
The spring holds the rod retracted; applying air pushes the rod out, and removing air lets the spring return it. Forces below are the NET spring-deducted values from the AirTAC thrust table. Confirm against the product label before installation.
Net Push Force (Ø4mm)
| Pressure | Net push force |
|---|---|
| 0.5 MPa | 4.1 N |
| 0.7 MPa (max) | 6.6 N |
These are the usable push forces after the return spring is subtracted, taken directly from the AirTAC single-acting thrust table. Minimum operating pressure is set by the spring, so this model needs at least the lower pressure shown to move.
Model Code: Airtac PSB Single Acting Compact Cylinder PSB4X20
| PSB | JIS pen-size single acting, push type (spring return) mini-cylinder series. |
|---|---|
| 4 | Bore size in mm. |
| ×20 | Stroke length in mm. |
| S | Built-in magnet for magnetic-switch position sensing (omit = no magnet). |
| R / U / CB | Back cover: R axial inlet, U 90° side inlet, CB double clevis (bore-dependent). |
Mounting accessories: LB, FA, CJ. Related PB-family variants: PB (double acting), PTB (single-acting pull), PBD (double rod), PBR (front-mount).
Where the Airtac PSB Single Acting Compact Cylinder PSB4X20 Is Used
Micro Part Ejection
Pushes small electronic components out of machining fixtures with a reliable 4.1 N net force.
Light Diverter Gate
Acts as a compact sorting flap on a packaging line, relying on the spring to fail-safe close.
Lab Sample Pusher
Advances delicate test strips into position using a Ø2 mm rod suited for coaxial thrust.
Is the Airtac PSB Single Acting Compact Cylinder PSB4X20 the Right Cylinder?
When sizing this Ø4 model, consider the next bore up: the Ø6 version provides 10.6 N of net push at 0.5 MPa if your application requires more force. If you need force in both directions without spring deduction, the PB double-acting series is the correct choice. Plan for a safe working load of about 2 N, which is roughly 60 percent of the 4.1 N rated figure, to account for seal friction.
The spring ensures the rod stays safely retracted on air loss, but it also sets the 0.3 MPa minimum pressure threshold. Confirm your ordering essentials: 4 mm bore, 20 mm stroke, and the M3x0.5 tube port. This specific configuration ships without a sensor magnet.
Quick checklist
- ✓ Net push force at your working pressure
- ✓ Only one air line / solenoid needed
- ✓ Fail-safe retract on air loss
- ✓ Magnet (S) for sensors?
- ✓ Stroke ≤ 60 mm (single-acting limit)
- ✓ Keep the load coaxial — avoid side load
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.3 – 0.7 MPa operating pressure.
- check Allow for spring force in the stroke direction.
- check Do not add an external return mechanism.
- check Keep the load coaxial; avoid side load on the thin rod.
- check Do not dismantle the front or back cover.
Airtac PSB Single Acting Compact Cylinder PSB4X20 FAQ
It provides 4.1 N of net push at 0.5 MPa and 6.6 N at the 0.7 MPa maximum. Because the internal spring opposes motion, a minimum pressure of 0.3 MPa is required before the rod extends.
The Ø4 bore has no cushion or bumper, so external deceleration may be needed for fast cycles. This specific model also lacks a sensor magnet, meaning position detection is not supported.
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Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
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Most inquiries answered within 7-8 hours.
Related AirTAC PSB Pen-Size Cylinders
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