Airtac PTBR Single Acting Square Head Compact Cylinder PTBR12X20R
The AirTAC Airtac PTBR Single Acting Square Head Compact Cylinder PTBR12X20R 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, 20mm stroke; the return spring resets the rod when air is released.
- BoreØ12 mm
- Stroke20 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 PTBR12X20R
The AirTAC PTBR12X20R is a JIS pen-size single-acting pull cylinder. Air entering the M5x0.8 port retracts the rod, while an internal spring pushes it back out. This provides 33.1 N of net pull force at 0.5 MPa and 51.8 N at 0.7 MPa. The spring holds the rod extended, ensuring a fail-safe out state during air loss.
It bolts directly to a fixture via the M5x0.8 front-cover thread. The SUS316L stainless barrel resists corrosion in tight spaces. Because pulling acts on the rod-side area, this output is lower than a matching push cylinder. Plan for a safe working load of about 20 N, which is roughly 60 percent of the rated force, to account for seal friction.
Airtac PTBR Single Acting Square Head Compact Cylinder PTBR12X20R Technical Specifications
| Model | Airtac PTBR Single Acting Square Head Compact Cylinder PTBR12X20R |
|---|---|
| Series | PTBR JIS pen-size front-mount cylinder |
| Bore size | Ø12 mm |
| Rod diameter | Ø5 mm |
| Stroke | 20 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 PTBR12X20R
| PTBR | JIS pen-size front-mount single acting, pull type (spring extend) series. |
|---|---|
| 12 | Bore size in mm. |
| ×20 | 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 PTBR12X20R Is Used
Hold-Down Clamp
Pulls a clamp arm down to secure a workpiece, with the spring automatically releasing it upward when air is removed.
Retract-to-Open Gate
Holds a sorting gate closed via spring pressure, opening the lane only when compressed air pulls the rod back.
Wire Tensioner
Maintains steady pulling tension on a filament or wire spool, defaulting to a safe extended position if pneumatic pressure drops.
Is the Airtac PTBR Single Acting Square Head Compact Cylinder PTBR12X20R the Right Cylinder?
This 12 mm bore provides 33.1 N of usable pull at 0.5 MPa. Stepping down to a 10 mm bore yields 23.5 N, while moving up to a 16 mm bore offers 65.0 N. Choose this size if your fixture requires moderate tensioning. The direct front mount simplifies installation, and the fail-safe extend behavior keeps tooling open without air.
Confirm your plumbing uses the R axial inlet back cover. The fixed TPU bumper only decelerates the last few millimeters of travel, so meter-out the exhaust if moving heavy tooling. The 20 mm stroke is well within the 75 mm limit for this bore.
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 PTBR12X20R FAQ
It delivers 33.1 N of net pull at 0.5 MPa and 51.8 N at 0.7 MPa. Because it is spring-extended, a minimum operating pressure of 0.2 MPa is required to overcome the spring and retract the rod.
It mounts directly via the M5x0.8 thread on the front cover. Air connects to the R axial inlet on the back cover, keeping plumbing in line with the SUS316L barrel for compact setups.
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Related AirTAC PTBR Pen-Size Cylinders
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