Airtac PSBR Single Acting Square Head Compact Cylinder PSBR8X40U
The AirTAC Airtac PSBR Single Acting Square Head Compact Cylinder PSBR8X40U 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, 40mm stroke; the return spring resets the rod when air is released.
- BoreØ8 mm
- Stroke40 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 PSBR8X40U
The AirTAC PSBR8X40U is a single-acting push, spring-return pen-size mini cylinder. It provides 18.7 N of net push at 0.5 MPa, extending when air enters the M5x0.8 port. A built-in spring retracts the rod upon air release, ensuring fail-safe retraction.
The direct M4x0.7 front-cover thread mounts straight to your fixture, eliminating brackets. The SUS316L stainless barrel suits damp environments. A fixed TPU bumper cushions the stroke ends.
Airtac PSBR Single Acting Square Head Compact Cylinder PSBR8X40U Technical Specifications
| Model | Airtac PSBR Single Acting Square Head Compact Cylinder PSBR8X40U |
|---|---|
| Series | PSBR JIS pen-size front-mount cylinder |
| Bore size | Ø8 mm |
| Rod diameter | Ø4 mm |
| Stroke | 40 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 PSBR8X40U
| PSBR | JIS pen-size front-mount single acting, push type (spring return) series. |
|---|---|
| 8 | Bore size in mm. |
| ×40 | 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 PSBR8X40U Is Used
Panel Pusher
Uses the spring-return push to press a light panel into a slot. The direct M4x0.7 front mount keeps the jig compact.
Part Ejector
Sheds small parts off a belt. The fail-safe retract ensures the ejector clears the line when air drops.
Clamp Release
Extends to free a small workpiece. The U side inlet allows tidy hose routing in tight spaces.
Is the Airtac PSBR Single Acting Square Head Compact Cylinder PSBR8X40U the Right Cylinder?
This 8 mm bore with a 40 mm stroke yields 18.7 N net push at 0.5 MPa and 28.7 N at 0.7 MPa. If you need less force, the 6 mm bore offers 10.6 N at 0.5 MPa. For heavier tasks, the 10 mm bore provides 29.8 N. The spring sets a 0.2 MPa minimum pressure before motion begins.
The U suffix provides a 90-degree side inlet for flat plumbing. The direct M4x0.7 front thread bolts directly to your tool. The thin Ø4 mm rod handles coaxial thrust; add an external guide for off-axis loads. No magnet is installed.
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 PSBR8X40U FAQ
It delivers 18.7 N net push at 0.5 MPa and 28.7 N at 0.7 MPa. The internal return spring requires a minimum 0.2 MPa to extend the rod. It fails safe to the retracted position on air loss.
It mounts directly via an M4x0.7 thread on the front cover, requiring no bracket. The barrel is SUS316L stainless steel. This specific model lacks a sensor magnet.
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
Request a Quote for Airtac PSBR Single Acting Square Head Compact Cylinder PSBR8X40U
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.