Airtac PTBR Single Acting Square Head Compact Cylinder PTBR12X50R
The AirTAC Airtac PTBR Single Acting Square Head Compact Cylinder PTBR12X50R 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 PTBR12X50R
The AirTAC PTBR12X50R 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. Because it fails safe in the extended position, a loss of air pressure keeps the rod safely out. This unit provides a usable 33.1 N net pull at 0.5 MPa.
It bolts directly to a fixture via the M5x0.8 front-cover thread, eliminating extra brackets. The SUS316L stainless barrel resists corrosion in tight spaces. A fixed TPU bumper cushions the end of travel, though with heavy tooling mass at higher speeds you should meter-out the exhaust or add an external shock absorber. The R back cover provides an axial inline air inlet.
Airtac PTBR Single Acting Square Head Compact Cylinder PTBR12X50R Technical Specifications
| Model | Airtac PTBR Single Acting Square Head Compact Cylinder PTBR12X50R |
|---|---|
| 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 PTBR12X50R
| 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 PTBR12X50R Is Used
Hold-Down Clamping
Uses spring pressure to keep a workpiece extended and clamped, retracting only when air is applied to release the part.
Tensioning Mechanism
Maintains constant pulling tension on a belt or filament via spring force, using air to slacken the line on demand.
Retract-To-Open Gate
Holds a lightweight access gate closed by default with the rod out, pulling it open safely upon pneumatic actuation.
Is the Airtac PTBR Single Acting Square Head Compact Cylinder PTBR12X50R the Right Cylinder?
This 12mm bore generates 33.1 N net pull at 0.5 MPa and 51.8 N at 0.7 MPa. If you need less force, the 10mm bore offers 23.5 N at 0.5 MPa; for heavier loads, the 16mm bore provides 65.0 N. Plan for a safe working load of about 20 N, which is roughly 60 percent of the 0.5 MPa rating, to account for seal friction. In a vertical lift scenario, it holds or pulls about 1.7 kg with a sane 2:1 safety margin.
Remember the internal spring requires a minimum 0.2 MPa to overcome before motion begins. The direct M5x0.8 front-mount thread handles mounting, and the R axial inlet manages plumbing. The 50mm stroke is well within the 75mm 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 PTBR12X50R FAQ
It provides a net pull of 33.1 N at 0.5 MPa and 51.8 N at 0.7 MPa. Because it is spring-extended, a minimum of 0.2 MPa is required to overcome the spring before the rod retracts. It fails safe in the extended position.
It mounts directly via the M5x0.8 front-cover thread. The air supply connects to the M5x0.8 port on the R axial inlet back cover. The SUS316L stainless barrel ensures durability in compact spaces.
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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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