Airtac PTBR Single Acting Square Head Compact Cylinder PTBR12X40SR
The AirTAC Airtac PTBR Single Acting Square Head Compact Cylinder PTBR12X40SR 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 PTBR12X40SR
The AirTAC PTBR12X40SR is a JIS pen-size single-acting pull cylinder. Air entering the M5x0.8 port retracts the rod, while a spring extends it out. This provides 33.1 N of net pull at 0.5 MPa, acting on the smaller rod-side area for reliable tensioning.
It bolts directly to a fixture via the M5x0.8 front-cover thread, saving space. The SUS316L stainless barrel resists corrosion, and the -S suffix indicates a built-in piston magnet for reed or electronic switches. A fixed TPU bumper cushions the stroke ends.
Airtac PTBR Single Acting Square Head Compact Cylinder PTBR12X40SR Technical Specifications
| Model | Airtac PTBR Single Acting Square Head Compact Cylinder PTBR12X40SR |
|---|---|
| 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 PTBR12X40SR
| 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 PTBR12X40SR Is Used
Hold-Down Clamp
Uses spring extension to keep a clamp open safely. Air pulls the rod back to grip parts, ideal for automated machining fixtures.
Tensioner Unit
Maintains steady tension on a belt or wire. The cylinder pulls with 33.1 N force at 0.5 MPa and releases automatically on air loss.
Retract-to-Open Gate
Spring force holds a conveyor guide gate open by default. Applying air retracts the rod to close the lane for sorting operations.
Is the Airtac PTBR Single Acting Square Head Compact Cylinder PTBR12X40SR the Right Cylinder?
This 12 mm bore provides 33.1 N net pull at 0.5 MPa (51.8 N at 0.7 MPa). If you need less force, the 10 mm bore yields 23.5 N; for heavier pulls, the 16 mm bore offers 65.0 N. Plan for a safe working load of about 20 N, which is roughly 60 percent of the 0.5 MPa rating.
The spring ensures fail-safe extension on air loss. The direct M5x0.8 front-mount thread simplifies installation, and the R axial back cover provides inline plumbing. Confirm your stroke needs against 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 PTBR12X40SR FAQ
The net pull force is 33.1 N at 0.5 MPa and 51.8 N at 0.7 MPa. Because it is single-acting pull, a minimum pressure of 0.2 MPa is required to overcome the spring, and the rod fails-safe extended upon air loss.
It mounts directly via the M5x0.8 front-cover thread. The SUS316L stainless barrel houses a built-in magnet for position detection, compatible with either reed or electronic switches.
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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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Related AirTAC PTBR Pen-Size Cylinders
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