Airtac PTBR Single Acting Square Head Compact Cylinder PTBR12X50SR
The AirTAC Airtac PTBR Single Acting Square Head Compact Cylinder PTBR12X50SR 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, 50mm stroke; the return spring resets the rod when air is released.
- BoreØ12 mm
- Stroke50 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 PTBR12X50SR
The AirTAC PTBR12X50SR is a JIS pen-size single-acting pull cylinder with a 12mm bore and 50mm 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 delivers 33.1N net pull at 0.5 MPa and 51.8N at 0.7 MPa. The SUS316L stainless barrel keeps the slim body corrosion-resistant for tight jigs.
This variant includes a built-in piston magnet for reed or electronic switches and an R axial-inlet back cover. You bolt it directly to a fixture via the front-cover M5x0.8 thread. A fixed TPU bumper cushions the end strokes, and the thin Ø5mm rod is designed purely for coaxial thrust.
Airtac PTBR Single Acting Square Head Compact Cylinder PTBR12X50SR Technical Specifications
| Model | Airtac PTBR Single Acting Square Head Compact Cylinder PTBR12X50SR |
|---|---|
| Series | PTBR JIS pen-size front-mount cylinder |
| Bore size | Ø12 mm |
| Rod diameter | Ø5 mm |
| Stroke | 50 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 PTBR12X50SR
| PTBR | JIS pen-size front-mount single acting, pull type (spring extend) series. |
|---|---|
| 12 | Bore size in mm. |
| ×50 | 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 PTBR12X50SR Is Used
Fail-Safe Hold-Down Clamp
Uses spring extension to maintain downward clamping pressure on a part automatically if compressed air drops, ensuring the workpiece stays secured.
Retract-to-Open Gate
Air pulls the 50mm stroke back to open a small diverter gate on a conveyor line, with the spring automatically closing the gate when air is removed.
Light Tensioning Arm
Maintains steady tension on a light wire or film web, pulling back to a home position whenever the pneumatic signal is released.
Is the Airtac PTBR Single Acting Square Head Compact Cylinder PTBR12X50SR the Right Cylinder?
This 12mm bore provides 33.1N net pull at 0.5 MPa. Stepping down to the Ø10 bore drops usable pull to 23.5N, while stepping up to the Ø16 bore raises it to 65.0N. Plan for a safe working load of about 20N (roughly 60% of the 0.5 MPa rating) to account for seal friction. For vertical lifts, expect to pull or hold around 1.7kg with a sane 2:1 safety margin.
Because the spring holds the rod extended during air loss, it is ideal for hold-down clamping. The direct M5x0.8 front-cover mount simplifies tooling integration. Confirm your solenoid plumbing and note that the thin Ø5mm rod requires an external guide if subjected to 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 PTBR12X50SR FAQ
It provides a net pull of 33.1N at 0.5 MPa and 51.8N at 0.7 MPa (maximum pressure). Because it is spring-extended, a minimum pressure of 0.2 MPa is required to overcome the spring and retract the rod.
It mounts directly via the front-cover M5x0.8 thread. The S denotes a built-in piston magnet, which is compatible with both AirTAC reed and electronic solid-state switches for position sensing.
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Standard models usually ship in 3-4 days.
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Related AirTAC PTBR Pen-Size Cylinders
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