Airtac PSBR Single Acting Square Head Compact Cylinder PSBR8X50SR
The AirTAC Airtac PSBR Single Acting Square Head Compact Cylinder PSBR8X50SR 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, 50mm stroke; the return spring resets the rod when air is released.
- BoreØ8 mm
- Stroke50 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 PSBR8X50SR
The AirTAC PSBR8X50SR is a single-acting push pen cylinder that extends via one M5x0.8 air port and retracts via an internal spring, ensuring a fail-safe home position on air loss. It supplies 18.7 N of net push at 0.5 MPa and 28.7 N at the 0.7 MPa maximum. The SUS316L stainless barrel shrinks footprint for tight jigs.
A direct M4x0.7 front-cover thread mounts the body straight to your fixture without extra brackets. The R axial inlet keeps plumbing in-line. A fixed TPU bumper decelerates the rod near stroke ends. The built-in S magnet supports reed or electronic switches for position sensing.
Airtac PSBR Single Acting Square Head Compact Cylinder PSBR8X50SR Technical Specifications
| Model | Airtac PSBR Single Acting Square Head Compact Cylinder PSBR8X50SR |
|---|---|
| Series | PSBR JIS pen-size front-mount cylinder |
| Bore size | Ø8 mm |
| Rod diameter | Ø4 mm |
| Stroke | 50 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 PSBR8X50SR
| PSBR | JIS pen-size front-mount single acting, push type (spring return) series. |
|---|---|
| 8 | Bore size in mm. |
| ×50 | 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 PSBR8X50SR Is Used
Panel Pusher
Shoves lightweight panels forward on a conveyor using the direct front thread, with the spring pulling the rod back to clear the workspace.
Part Ejector
Kicks small machined parts out of a chuck using 18.7 N net push, relying on the fail-safe retract to avoid blocking the spindle.
Clamp Release
Overcomes a holding spring to unclamp delicate workpieces, letting the internal cylinder spring secure the retracted state during downtime.
Is the Airtac PSBR Single Acting Square Head Compact Cylinder PSBR8X50SR the Right Cylinder?
This 8 mm bore generates 18.7 N net push at 0.5 MPa. Stepping down to the 6 mm bore yields 10.6 N, while the 10 mm bore provides 29.8 N. Plan for a safe working load of roughly 11 N, which is about 60 percent of the 0.5 MPa figure to account for seal friction. This equates to lifting about 1 kg vertically with a sane 2:1 margin.
The 50 mm stroke sits near the 60 mm limit for this bore, so the thin Ø4 mm piston rod requires an external guide or linear bearing to prevent side-load deflection. Confirm the direct M4x0.7 front-mount thread engagement and the single solenoid line for the spring-return function.
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 PSBR8X50SR FAQ
It delivers 18.7 N net push at 0.5 MPa and 28.7 N at the 0.7 MPa maximum. The internal return spring sets a 0.2 MPa minimum pressure before the rod moves, and the cylinder fails safe to the retracted position on air loss.
It bolts directly to a fixture via the M4x0.7 front-cover thread. The S suffix indicates a built-in piston magnet compatible with reed or electronic switches, while the SUS316L barrel handles damp environments.
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
Request a Quote for Airtac PSBR Single Acting Square Head Compact Cylinder PSBR8X50SR
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.