Airtac PTBR Single Acting Square Head Compact Cylinder PTBR12X40R
The AirTAC Airtac PTBR Single Acting Square Head Compact Cylinder PTBR12X40R 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, 40mm stroke; the return spring resets the rod when air is released.
- BoreØ12 mm
- Stroke40 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 PTBR12X40R
The AirTAC PTBR12X40R is a JIS pen-size single-acting pull cylinder with a 12mm bore and 40mm stroke. Air entering the M5x0.8 port retracts the rod, while loss of air pressure lets the spring push it back out, providing fail-safe extension for hold-down or tensioning tasks. It delivers 33.1 N of net pull at 0.5 MPa and 51.8 N at 0.7 MPa.
You mount this unit directly via its front-cover M5x0.8 thread, eliminating extra brackets to save space on tight jigs. The SUS316L stainless barrel resists corrosion, and a fixed TPU bumper cushions the end of travel. Because pull acts on the smaller rod-side area, this usable force is lower than a matching push-type cylinder.
Airtac PTBR Single Acting Square Head Compact Cylinder PTBR12X40R Technical Specifications
| Model | Airtac PTBR Single Acting Square Head Compact Cylinder PTBR12X40R |
|---|---|
| Series | PTBR JIS pen-size front-mount cylinder |
| Bore size | Ø12 mm |
| Rod diameter | Ø5 mm |
| Stroke | 40 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 PTBR12X40R
| PTBR | JIS pen-size front-mount single acting, pull type (spring extend) series. |
|---|---|
| 12 | Bore size in mm. |
| ×40 | 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 PTBR12X40R Is Used
Hold-Down Clamping
Uses spring pressure to keep a workpiece extended, then applies air to pull the clamp open and clear for part loading.
Tensioning Jig
Maintains constant pulling tension on a belt or wire via the spring, releasing the load only when compressed air is applied.
Retract-to-Open Gate
Holds a diverting gate closed by default and pulls it open pneumatically to route parts, ensuring a blocked path on air loss.
Is the Airtac PTBR Single Acting Square Head Compact Cylinder PTBR12X40R the Right Cylinder?
This 12mm bore provides 33.1 N net pull at 0.5 MPa. Stepping down to a 10mm bore yields 23.5 N, while moving up to a 16mm bore offers 65.0 N, letting you match the exact holding requirement. Plan for a safe working load of about 20 N (roughly 60% of the 0.5 MPa rating) to account for seal friction.
The fail-safe extended design ensures the rod stays out during air loss, and the direct front-cover thread simplifies fixture attachment. Confirm your plumbing uses the R axial inlet back cover and note the cylinder requires a minimum 0.2 MPa to overcome the spring.
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 PTBR12X40R FAQ
It provides 33.1 N net pull 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 and retract the rod. The rod fails safe to the extended position on air loss.
It mounts directly via an M5x0.8 front-cover thread and uses an R axial inlet back cover for inline plumbing. The body features a SUS316L stainless barrel and a fixed TPU bumper. This specific model has no sensor magnet.
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Covers non-human-caused product damage.
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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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