Airtac PTBR Single Acting Square Head Compact Cylinder PTBR12X25R
The AirTAC Airtac PTBR Single Acting Square Head Compact Cylinder PTBR12X25R is a single acting, pull type (spring extend) pen-size mini cylinder with direct front-cover mounting (M5×0.8 thread). A single air port drives the pull stroke on a Ø12mm bore, 25mm stroke; the return spring resets the rod when air is released.
- BoreØ12 mm
- Stroke25 mm
- Port sizeM5×0.8
- Front-mount threadM5×0.8
- Acting typePull, single acting
- ReturnSpring
About the Airtac PTBR Single Acting Square Head Compact Cylinder PTBR12X25R
The AirTAC PTBR12X25R is a JIS pen-size single-acting pull cylinder with a 12mm bore and 25mm stroke. Air entering the M5x0.8 port retracts the rod, while an internal spring pushes it back out, ensuring fail-safe extension on air loss. It provides 33.1N net pull at 0.5MPa and 51.8N at 0.7MPa.
You mount it directly via the front-cover M5x0.8 thread, saving space in tight jigs. The SUS316L stainless barrel and fixed TPU bumper ensure durable, compact performance. Because pull acts on the rod-side area, this force is lower than a matching push cylinder.
Airtac PTBR Single Acting Square Head Compact Cylinder PTBR12X25R Technical Specifications
| Model | Airtac PTBR Single Acting Square Head Compact Cylinder PTBR12X25R |
|---|---|
| Series | PTBR JIS pen-size front-mount cylinder |
| Bore size | Ø12 mm |
| Rod diameter | Ø5 mm |
| Stroke | 25 mm |
| Acting type | Single acting, pull type (spring extend) |
| Front-mount thread | M5×0.8 |
| 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 (pull by air) |
| Max standard stroke | Up to 75 mm |
The spring holds the rod extended; applying air retracts it, and removing air lets the spring push the rod back out. Front cover carries the mounting thread (M5×0.8); barrel is SUS316L. Forces below are NET spring-deducted values. Confirm against the product label.
Net Pull Force (Ø12mm)
| Pressure | Net pull force |
|---|---|
| 0.5 MPa | 33.1 N |
| 0.7 MPa (max) | 51.8 N |
These are usable pull 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 PTBR Single Acting Square Head Compact Cylinder PTBR12X25R
| PTBR | JIS pen-size front-mount single acting, pull type (spring extend) series. |
|---|---|
| 12 | Bore size in mm. |
| ×25 | Stroke length in mm. |
| S | Built-in magnet for magnetic-switch position sensing (omit = no magnet). |
| R | Back cover: R axial inlet (bore-dependent). |
Mounting: direct front-cover thread (M5×0.8). Related PBR-family variants: PBR (double acting), PSBR (single-acting push).
Where the Airtac PTBR Single Acting Square Head Compact Cylinder PTBR12X25R Is Used
Hold-Down Clamping
Uses spring pressure to keep a workpiece extended safely, retracting only when air is applied to release the part.
Retract-To-Open Gate
Failsafe spring tension holds the gate closed during air loss, pulling it open on command via the front-mount thread.
Web Tensioner
Maintains steady outward tension on a filament or belt, snapping back to the home position if the air supply drops.
Is the Airtac PTBR Single Acting Square Head Compact Cylinder PTBR12X25R the Right Cylinder?
This 12mm bore yields 33.1N net pull at 0.5MPa. Stepping down to a 10mm bore gives 23.5N, while a 16mm bore provides 65.0N. Plan for a safe working load of about 20N (roughly 60% of the rated figure) to account for seal friction. For vertical lifts, expect to hold or pull about 1.7kg with a 2:1 safety margin.
The spring requires a 0.2-0.7MPa supply before motion begins. The direct M5x0.8 front-mount thread bolts straight to your fixture, and the R axial inlet keeps plumbing in line. The 5mm rod is for coaxial thrust, so add an external guide for off-axis loads.
Quick checklist
- ✓ Net pull force at your working pressure
- ✓ Bolt directly through the front cover (M5×0.8)
- ✓ Only one air line / solenoid needed
- ✓ Fail-safe extend on air loss
- ✓ Magnet (S) for sensors?
- ✓ Stroke ≤ 75 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 PTBR Single Acting Square Head Compact Cylinder PTBR12X25R FAQ
It delivers 33.1N net pull at 0.5MPa and 51.8N at 0.7MPa. Because it is spring-extended, a minimum 0.2MPa is required to overcome the spring and retract the rod. The rod fails safe to the extended position on air loss.
It bolts directly to a fixture using the M5x0.8 front-cover thread. The back cover features an R axial air inlet for in-line plumbing. It uses a SUS316L stainless barrel and lacks a sensor magnet.
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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 PTBR Pen-Size Cylinders
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