Airtac PTBR Single Acting Square Head Compact Cylinder PTBR12X20SR
The AirTAC Airtac PTBR Single Acting Square Head Compact Cylinder PTBR12X20SR 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 PTBR12X20SR
The AirTAC PTBR12X20SR is a JIS pen-size single-acting pull cylinder with a 12mm bore and 20mm stroke. A spring holds the rod extended, while air entering the M5x0.8 port retracts it. Releasing air pressure lets the spring push the rod back out, providing a fail-safe extended state on air loss. It yields 33.1N net pull at 0.5 MPa and 51.8N at 0.7 MPa.
You mount it directly via the front-cover M5x0.8 thread, eliminating extra brackets for compact jigs. The SUS316L stainless barrel resists corrosion, and a fixed TPU bumper cushions the stroke ends. The built-in magnet (-S) supports reed or electronic switches, and the R axial inlet keeps plumbing in line.
Airtac PTBR Single Acting Square Head Compact Cylinder PTBR12X20SR Technical Specifications
| Model | Airtac PTBR Single Acting Square Head Compact Cylinder PTBR12X20SR |
|---|---|
| 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 PTBR12X20SR
| 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 PTBR12X20SR Is Used
Fail-Safe Hold-Down Clamp
Clamps a part under spring pressure; air retracts the rod to release. If air drops, the clamp stays safely engaged.
Retract-to-Open Gate
Holds a guide gate open via spring force. Applying air pulls the gate closed to divert items on the line.
Web Tensioner
Maintains steady tension on a film strip using the spring-extended rod. Air retracts the dancer arm to slacken the web.
Is the Airtac PTBR Single Acting Square Head Compact Cylinder PTBR12X20SR the Right Cylinder?
This 12mm bore provides 33.1N net pull at 0.5 MPa. If you need less force, the 10mm bore offers 23.5N; for heavier pulling, the 16mm bore provides 65.0N. Because pull acts on the smaller rod-side area, these figures are lower than matching push cylinders.
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 hold or pull about 1.7 kg with a 2:1 safety margin. The 0.2-0.7 MPa operating range requires minimum pressure to overcome the spring. Confirm your front M5x0.8 bolt engagement and add an external guide for off-axis loads on the 5mm rod.
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 PTBR12X20SR FAQ
The net pull force is 33.1N at 0.5 MPa and 51.8N at 0.7 MPa (maximum pressure). Because it is single-acting pull, a minimum of 0.2 MPa is required to overcome the spring and move the rod; upon air loss, the spring forces the rod to fail-safe extended.
It mounts directly via the front-cover M5x0.8 thread. The -S suffix indicates a built-in piston magnet compatible with reed or electronic solid-state switches. The SUS316L stainless barrel provides corrosion resistance.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC PTBR Pen-Size Cylinders
Request a Quote for Airtac PTBR Single Acting Square Head Compact Cylinder PTBR12X20SR
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.