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
- 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 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.
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.
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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