Airtac PSBR Single Acting Square Head Compact Cylinder PSBR8X20SU
The AirTAC Airtac PSBR Single Acting Square Head Compact Cylinder PSBR8X20SU 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
About the Airtac PSBR Single Acting Square Head Compact Cylinder PSBR8X20SU
The AirTAC PSBR8X20SU is a JIS pen-size single-acting push cylinder with a 20 mm stroke. Air entering the M5x0.8 port extends the 4 mm rod, while an internal spring retracts it. This fail-safe design ensures the rod pulls home on air loss, needing only one solenoid line. It delivers 18.7 N of net push at 0.5 MPa.
The slim SUS316L stainless body bolts directly to your fixture via the front-cover M4x0.7 thread, saving space. The U suffix adds a 90-degree side inlet for flat plumbing. A fixed TPU bumper decelerates the stroke ends, and the built-in magnet (-S) works with reed or electronic switches.
Airtac PSBR Single Acting Square Head Compact Cylinder PSBR8X20SU Technical Specifications
| Model | Airtac PSBR Single Acting Square Head Compact Cylinder PSBR8X20SU |
|---|---|
| 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 PSBR8X20SU
| 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 PSBR8X20SU Is Used
Panel Pusher
Extends to nudge lightweight electrical panels into a test fixture, relying on the spring retract to clear the area on air loss.
Part Ejector
Pushes small molded parts off a conveyor belt; the direct M4x0.7 front mount threads straight into the machine frame.
Clamp Release
Single-acting push action opens a small holding clamp, saving wiring complexity with one solenoid line.
Is the Airtac PSBR Single Acting Square Head Compact Cylinder PSBR8X20SU the Right Cylinder?
This 8 mm bore provides 18.7 N net push at 0.5 MPa and 28.7 N at 0.7 MPa. Sizing both ways: a 6 mm bore yields 10.6 N, while a 10 mm bore offers 29.8 N at 0.5 MPa. Plan for a safe working load of roughly 11 N (about 60 percent of the 0.5 MPa figure) to account for seal friction. This equates to lifting about 1 kg vertically with a 2:1 margin.
The return spring sets a 0.2 MPa minimum pressure before motion. The direct M4x0.7 front mount eliminates brackets, and the fail-safe retract secures the rod home. Confirm the M5x0.8 air port and 90-degree side inlet fit your manifold layout.
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 PSBR8X20SU FAQ
It provides 18.7 N net push at 0.5 MPa and 28.7 N at 0.7 MPa maximum. The internal return spring requires a minimum 0.2 MPa air pressure to overcome the spring and extend the rod.
It mounts directly via an M4x0.7 thread on the front cover, eliminating separate brackets. The barrel is made of SUS316L stainless steel for durability in tight jigs.
Authorized Export Seller
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.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC PSBR Pen-Size Cylinders
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