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
- 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 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.
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.
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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