Airtac PSBR Single Acting Square Head Compact Cylinder PSBR8X20U
The AirTAC Airtac PSBR Single Acting Square Head Compact Cylinder PSBR8X20U is a single acting, push type (spring return) pen-size mini cylinder with direct front-cover mounting (M4×0.7 thread). A single air port drives the push stroke on a Ø8mm bore, 20mm stroke; the return spring resets the rod when air is released.
- BoreØ8 mm
- Stroke20 mm
- Port sizeM5×0.8
- Front-mount threadM4×0.7
- Acting typePush, single acting
- ReturnSpring
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac PSBR Single Acting Square Head Compact Cylinder PSBR8X20U
The AirTAC PSBR8X20U is a JIS pen-size single-acting push cylinder with a 20mm stroke and 8mm bore. Air entering the M5x0.8 port extends the rod, while an internal spring retracts it on air loss for fail-safe closed operation. It supplies 18.7N of net push at 0.5 MPa and 28.7N at 0.7 MPa.
The slim SUS316L stainless body bolts directly to a fixture via the front-cover M4x0.7 thread, eliminating extra brackets. A fixed TPU bumper cushions the stroke ends.
Airtac PSBR Single Acting Square Head Compact Cylinder PSBR8X20U Technical Specifications
| Model | Airtac PSBR Single Acting Square Head Compact Cylinder PSBR8X20U |
|---|---|
| Series | PSBR JIS pen-size front-mount cylinder |
| Bore size | Ø8 mm |
| Rod diameter | Ø4 mm |
| Stroke | 20 mm |
| Acting type | Single acting, push type (spring return) |
| Front-mount thread | M4×0.7 |
| Port size | M5×0.8 |
|---|---|
| Operating pressure | 0.2 – 0.7 MPa |
| Proof pressure | 1.2 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 50 – 800 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. Front cover carries the mounting thread (M4×0.7); barrel is SUS316L. Forces below are NET spring-deducted values. Confirm against the product label.
Net Push Force (Ø8mm)
| Pressure | Net push force |
|---|---|
| 0.5 MPa | 18.7 N |
| 0.7 MPa (max) | 28.7 N |
These are usable push forces after the return spring is subtracted, 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 PSBR Single Acting Square Head Compact Cylinder PSBR8X20U
| PSBR | JIS pen-size front-mount single acting, push type (spring return) series. |
|---|---|
| 8 | Bore size in mm. |
| ×20 | Stroke length in mm. |
| S | Built-in magnet for magnetic-switch position sensing (omit = no magnet). |
| U / R | Back cover: U 90° side inlet or R axial inlet (bore-dependent). |
Mounting: direct front-cover thread (M4×0.7). Related PBR-family variants: PBR (double acting), PTBR (single-acting pull).
Where the Airtac PSBR Single Acting Square Head Compact Cylinder PSBR8X20U Is Used
Panel Pusher
Extends to push a lightweight panel into a test fixture, with the internal spring safely retracting the rod if compressed air drops.
Part Ejector
Uses the direct M4x0.7 front mount to bolt straight over a belt, ejecting small parts using 18.7N of net push at 0.5MPa.
Clamp Release
Overcomes a holding mechanism to release a part, relying on the 90-degree side inlet for tight clearance installations.
Is the Airtac PSBR Single Acting Square Head Compact Cylinder PSBR8X20U the Right Cylinder?
This 8mm bore provides 18.7N net push at 0.5MPa. Stepping down to the 6mm bore yields 10.6N, while moving up to the 10mm bore offers 29.8N. Size based on your actual load and the 0.2-0.7MPa operating range. The return spring sets a minimum pressure before motion begins.
The direct M4x0.7 front-mount thread secures the cylinder without a separate bracket, and the U designation provides a 90-degree side air inlet for flat plumbing. The thin Ø4mm rod is built for coaxial thrust; over the 20mm stroke, avoid side loads or add an external linear bearing.
Quick checklist
- ✓ Net push force at your working pressure
- ✓ Bolt directly through the front cover (M4×0.7)
- ✓ Only one air line / solenoid needed
- ✓ Fail-safe retract on air loss
- ✓ Magnet (S) for sensors?
- ✓ Stroke ≤ 60 mm (single-acting limit)
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.2 – 0.7 MPa operating pressure.
- check Allow for spring force in the stroke direction.
- check Match bolt size and engagement to the front thread.
- check Do not add an external return mechanism.
- check Keep the load coaxial; avoid side load on the thin rod.
Airtac PSBR Single Acting Square Head Compact Cylinder PSBR8X20U FAQ
It delivers 18.7N net push at 0.5MPa and 28.7N at 0.7MPa. Because it is spring-return, the internal spring sets a minimum pressure of 0.2MPa before the rod can move, and the cylinder fails safely retracted on air loss.
It mounts directly via the front-cover M4x0.7 thread, saving space without extra brackets. The barrel is SUS316L stainless steel, and the air inlet port is M5x0.8.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC PSBR Pen-Size Cylinders
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