The AirTAC Airtac PTBR Single Acting Square Head Compact Cylinder PTBR16X50SR 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.
The AirTAC PTBR16X50SR is a JIS pen-size single-acting pull cylinder with a 16 mm bore and 50 mm stroke. Air entering the M5x0.8 port retracts the rod, while an internal spring pushes it back out. This provides 65 N of net pull force at 0.5 MPa, increasing to 101.2 N at the 0.7 MPa maximum. Because pulling acts on the smaller rod-side annular area, this force is lower than a matching push-type cylinder.
It features a SUS316L stainless barrel and a built-in piston magnet for position sensing. You bolt directly via the M5x0.8 front-cover thread, saving space in tight jigs. The fixed TPU bumper decelerates the stroke ends, and the spring ensures the rod stays extended upon air loss. Plan for a safe working load of about 39 N, which is roughly 60 percent of the rated 0.5 MPa force.
| Model | Airtac PTBR Single Acting Square Head Compact Cylinder PTBR16X50SR |
|---|---|
| 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.
| 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.
| 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).
Uses spring pressure to keep a workpiece extended safely, applying 65 N of pull at 0.5 MPa to retract and release the part when air is applied.
Holds a diverter gate closed via spring force on air loss, opening the path only when the solenoid signals the cylinder to pull back.
Maintains steady tension on a filament or wire spool, pulling back to take up slack and extending automatically if the line goes slack.
Selecting this 16 mm bore requires checking your force needs both ways. If 65 N of net pull at 0.5 MPa is excessive, stepping down to a 12 mm bore yields 33.1 N. If you need more power, you are at the top standard size for this pen series. The direct M5x0.8 front-mount thread allows straight fixture attachment, while the R axial back cover keeps plumbing in line.
Remember the fail-safe extend behavior: dropping air pressure pushes the rod out. The internal spring demands a minimum 0.2 MPa operating pressure to overcome friction and initiate motion. Confirm your ordering code includes the S for the magnet and R for the axial inlet.
Quick checklist
It provides a net pull of 65 N at 0.5 MPa and 101.2 N at the 0.7 MPa maximum. A minimum pressure of 0.2 MPa is required before the rod can move. Upon air loss, the spring forces the rod to fail-safe extended.
Mounting is direct via the M5x0.8 front-cover thread. The -S suffix denotes a built-in piston magnet compatible with AirTAC reed or electronic solid-state switches. The SUS316L stainless barrel houses the assembly.
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