Airtac PSBR Single Acting Square Head Compact Cylinder PSBR8X20SR
The AirTAC Airtac PSBR Single Acting Square Head Compact Cylinder PSBR8X20SR 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 PSBR8X20SR
The AirTAC PSBR8X20SR is a single-acting push pen cylinder featuring a direct M4x0.7 front-cover mounting thread. Air entering the M5x0.8 port extends the rod, while an internal spring retracts it on air release, ensuring a fail-safe retracted position. It supplies about 18.7 N of net push at 0.5 MPa.
Built with a SUS316L stainless barrel and a slim mini body, it saves space in tight jigs. The fixed TPU bumper decelerates the rod at stroke ends. The built-in magnet supports reed or electronic switches. Plan for a safe working load of roughly 11 N, which lifts about 1 kg vertically with a 2:1 margin.
Airtac PSBR Single Acting Square Head Compact Cylinder PSBR8X20SR Technical Specifications
| Model | Airtac PSBR Single Acting Square Head Compact Cylinder PSBR8X20SR |
|---|---|
| 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 PSBR8X20SR
| 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 PSBR8X20SR Is Used
Part Ejection
Uses the spring-return push to eject small machined components from a fixture, ensuring the arm retracts safely if air pressure drops.
Panel Pusher
Extends to nudge lightweight electronic panels into a testing slot, relying on the 18.7 N net push and direct front mount for compact placement.
Clamp Release
Pushes a lightweight lever to release a secondary clamp, with the internal spring automatically pulling back to clear the workspace.
Is the Airtac PSBR Single Acting Square Head Compact Cylinder PSBR8X20SR 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. Stepping down to a 6 mm bore yields 10.6 N, while stepping up to a 10 mm bore provides 29.8 N at 0.5 MPa. The internal spring sets a 0.2 MPa minimum pressure before motion begins.
The direct M4x0.7 front-mount thread bolts straight to your fixture, and the R axial inlet simplifies in-line plumbing. The thin Ø4 mm rod is built for coaxial thrust, so add an external guide for off-axis loads. Confirm your stroke needs; this 20 mm stroke sits well below the 60 mm limit.
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 PSBR8X20SR FAQ
It delivers 18.7 N of net push at 0.5 MPa and 28.7 N at 0.7 MPa. Because it is spring-return, a minimum pressure of 0.2 MPa is required before the rod moves, and it fails safe to the retracted position on air loss.
The -S suffix indicates a built-in piston magnet compatible with reed or electronic switches. It mounts directly via the M4x0.7 front-cover thread, while air connects to the M5x0.8 port with an R axial inlet.
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1-Year Warranty
Covers non-human-caused product damage.
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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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