Airtac PSBR Single Acting Square Head Compact Cylinder PSBR8X20R
The AirTAC Airtac PSBR Single Acting Square Head Compact Cylinder PSBR8X20R 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 PSBR8X20R
The AirTAC PSBR8X20R is a JIS pen-size single-acting push cylinder with a spring-return mechanism. Feeding air to the single M5x0.8 port extends the rod, while the internal spring ensures a fail-safe retraction upon air loss. It supplies 18.7 N of net push at 0.5 MPa, reaching 28.7 N at the 0.7 MPa maximum. The R suffix indicates an axial back-cover inlet for in-line plumbing.
This compact actuator features a SUS316L stainless barrel and a slim body that bolts directly to your fixture via the front-cover M4x0.7 thread, eliminating extra brackets. A fixed TPU bumper decelerates the stroke near the ends. For practical sizing, plan for a safe working load of about 11 N (roughly 60 percent of the 0.5 MPa rating) to account for seal friction. This equates to lifting about 1 kg vertically with a sane 2:1 margin.
Airtac PSBR Single Acting Square Head Compact Cylinder PSBR8X20R Technical Specifications
| Model | Airtac PSBR Single Acting Square Head Compact Cylinder PSBR8X20R |
|---|---|
| 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 PSBR8X20R
| 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 PSBR8X20R Is Used
Panel Pusher
Uses the direct M4x0.7 front mount to bolt directly into a tight jig, pushing light panels forward before the spring retracts the rod on air release.
Part Ejector
Deploys the 18.7 N push force at 0.5 MPa to kick small machined parts off a conveyor belt, relying on the fail-safe retract to clear the path.
Clamp Release
Applies axial thrust to release a small secondary clamp, with the SUS316L barrel offering durability in compact automated assembly modules.
Is the Airtac PSBR Single Acting Square Head Compact Cylinder PSBR8X20R the Right Cylinder?
This 8 mm bore with a 20 mm stroke provides 18.7 N net push at 0.5 MPa. If you need less force, the 6 mm bore offers 10.6 N at the same pressure; stepping up to the 10 mm bore yields 29.8 N. The internal spring sets a 0.2 MPa minimum pressure before motion begins and holds the rod safely retracted if air drops. The direct M4x0.7 front-mount thread secures the body straight into your tooling.
Because the rod is a slender 4 mm diameter, it is built for coaxial thrust rather than side loading; over this 20 mm stroke, add an external linear bearing if the load is off-axis. The fixed TPU bumper only cushions the last few millimeters, so at high cycling speeds with real tooling mass, meter-out the exhaust or add an external shock absorber. This specific configuration includes the R axial inlet and no sensor magnet.
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 PSBR8X20R FAQ
The net usable push force is 18.7 N at 0.5 MPa and 28.7 N at the 0.7 MPa maximum. The internal return spring requires a minimum pressure of 0.2 MPa before the rod begins to move, and it holds the rod retracted on air loss.
It mounts directly via a front-cover M4x0.7 thread, separate from the M5x0.8 air port, saving space without extra brackets. The barrel is constructed from SUS316L stainless steel for durability in slim pen-size applications.
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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 PSBR Pen-Size Cylinders
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