Airtac PTBR Single Acting Square Head Compact Cylinder PTBR16X50R
The AirTAC Airtac PTBR Single Acting Square Head Compact Cylinder PTBR16X50R 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 Ø16mm bore, 50mm stroke; the return spring resets the rod when air is released.
- BoreØ16 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 PTBR16X50R
The AirTAC PTBR16X50R is a JIS pen-size single-acting pull cylinder with a 16mm bore and 50mm stroke. A spring holds the rod extended, while supplying air to the M5x0.8 port retracts it. Because the pull acts on the smaller rod-side area, the usable force is lower than a matching push type, yielding 65 N net pull at 0.5 MPa and 101.2 N at 0.7 MPa. The spring deduction is already included in these figures.
This model mounts directly via its front-cover M5x0.8 thread and uses an R axial back cover for in-line plumbing. The SUS316L stainless barrel provides corrosion resistance in tight jigs. A fixed TPU bumper decelerates the stroke ends. Plan for a safe working load of about 39 N, which is roughly 60 percent of the 0.5 MPa rating, to account for seal friction and smooth travel.
Airtac PTBR Single Acting Square Head Compact Cylinder PTBR16X50R Technical Specifications
| Model | Airtac PTBR Single Acting Square Head Compact Cylinder PTBR16X50R |
|---|---|
| Series | PTBR JIS pen-size front-mount cylinder |
| Bore size | Ø16 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 100 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 (Ø16mm)
| Pressure | Net pull force |
|---|---|
| 0.5 MPa | 65.0 N |
| 0.7 MPa (max) | 101.2 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 PTBR16X50R
| PTBR | JIS pen-size front-mount single acting, pull type (spring extend) series. |
|---|---|
| 16 | 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 PTBR16X50R Is Used
Hold-Down Clamping
Uses spring pressure to keep a workpiece clamped. Air retracts the rod to release the part, ensuring a safe hold if air pressure drops.
Retract-to-Open Gate
Blocks items on a line with the rod extended. Supplying air pulls the gate open, and the spring closes it automatically on air loss.
Web Tensioner
Maintains steady tension on a film or wire strip. The spring-extended rod pulls back consistently, with air retracting it to release tension.
Is the Airtac PTBR Single Acting Square Head Compact Cylinder PTBR16X50R the Right Cylinder?
For sizing, the PTBR16X50R offers 65 N net pull at 0.5 MPa. If your load requires less force, the neighboring 12mm bore provides 33.1 N at 0.5 MPa. Since 16mm is the largest available bore in this series, applications needing more than 101.2 N at 0.7 MPa require a different cylinder family. Remember the fail-safe extend behavior: on air loss, the spring pushes the rod out. The direct front-cover M5x0.8 thread bolts straight to your fixture, and the R axial inlet handles the air plumbing. Confirm your mounting thread engagement before ordering.
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 ≤ 100 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 PTBR16X50R FAQ
The net pull force is 65 N at 0.5 MPa and 101.2 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 move the rod. If air is lost, the spring fails safe to the extended position.
It mounts directly via an M5x0.8 thread on the front cover, eliminating the need for a separate bracket. The barrel is made of SUS316L stainless steel for corrosion resistance. This specific model does not include a sensor magnet.
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