Airtac PTB Single Acting Pen-Type Cylinder PTB16X25R
The AirTAC Airtac PTB Single Acting Pen-Type Cylinder PTB16X25R is a single acting, pull type (spring extend) pen-size mini cylinder with a Ø16mm bore and 25mm stroke. A single air port drives the pull stroke; the built-in return spring resets the rod when air is released, so only one solenoid line is needed.
- BoreØ16 mm
- Stroke25 mm
- Port sizeM5×0.8
- Acting typePull, single acting
- Rod threadM10×1.0
- ReturnSpring
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac PTB Single Acting Pen-Type Cylinder PTB16X25R
The AirTAC PTB16X25R is a JIS pen-size single-acting pull cylinder where air entering one M5x0.8 port retracts the rod, and an internal spring pushes it back out. It provides 65 N of net pull at 0.5 MPa and 101.2 N at the 0.7 MPa maximum. Because the return spring constantly opposes the air stroke, these figures already reflect the usable force after spring deduction.
This bore uses a slim SUS304 stainless body with a fixed TPU bumper at each end to soften end-of-stroke impacts. The R back cover provides an axial inline air connection. If air pressure drops, the spring forces the rod into the extended position, creating a fail-safe out state for hold-down or tensioning tasks. 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.
Airtac PTB Single Acting Pen-Type Cylinder PTB16X25R Technical Specifications
| Model | Airtac PTB Single Acting Pen-Type Cylinder PTB16X25R |
|---|---|
| Series | PTB JIS pen-size mini cylinder |
| Bore size | Ø16 mm |
| Rod diameter | Ø5 mm |
| Stroke | 25 mm |
| Acting type | Single acting, pull type (spring extend) |
| Port size | M5×0.8 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| 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 60 mm |
The spring holds the rod extended; applying air retracts it, and removing air lets the spring push the rod back out. Forces below are the NET spring-deducted values from the AirTAC thrust table. Confirm against the product label before installation.
Net Pull Force (Ø16mm)
| Pressure | Net pull force |
|---|---|
| 0.5 MPa | 65.0 N |
| 0.7 MPa (max) | 101.2 N |
These are the usable pull forces after the return spring is subtracted, taken directly 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 PTB Single Acting Pen-Type Cylinder PTB16X25R
| PTB | JIS pen-size single acting, pull type (spring extend) mini-cylinder series. |
|---|---|
| 16 | Bore size in mm. |
| ×25 | 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 accessories: LB, FA, CJ. Related PB-family variants: PB (double acting), PSB (single-acting push), PBD (double rod), PBR (front-mount).
Where the Airtac PTB Single Acting Pen-Type Cylinder PTB16X25R Is Used
Hold-Down Clamping
Uses the spring-extended rod to maintain clamping pressure by default, retracting only when air is applied to release the part.
Wire Belt Tensioner
Pulls back to tension a belt or wire during operation, with the internal spring automatically relaxing the pull on air loss.
Retract-To-Open Gate
Keeps a material diverter gate closed via spring force, using the 65 N pull to draw the gate open and redirect flow.
Is the Airtac PTB Single Acting Pen-Type Cylinder PTB16X25R the Right Cylinder?
Selecting this 16 mm bore with a 25 mm stroke gives substantial pull force in a compact footprint. If your task requires less power, dropping to the 12 mm bore yields 33.1 N net pull at 0.5 MPa. Since 16 mm is the largest standard PTB option, moving up requires switching to a double-acting PB series for higher output. The internal spring sets a 0.2 MPa minimum pressure before motion begins.
The R suffix specifies the axial inline inlet for streamlined plumbing. Keep in mind the Ø5 mm piston rod is designed for coaxial thrust; over this 25 mm stroke, add an external linear bearing if the application involves any off-axis load. The fixed TPU bumper only decelerates the last few millimeters, so meter-out the exhaust or add an external shock absorber when cycling real tooling mass at higher speeds.
Quick checklist
- ✓ Net pull force at your working pressure
- ✓ Only one air line / solenoid needed
- ✓ Fail-safe extend on air loss
- ✓ Magnet (S) for sensors?
- ✓ Stroke ≤ 60 mm (single-acting limit)
- ✓ Keep the load coaxial — avoid side load
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 Do not add an external return mechanism.
- check Keep the load coaxial; avoid side load on the thin rod.
- check Do not dismantle the front or back cover.
Airtac PTB Single Acting Pen-Type Cylinder PTB16X25R FAQ
It delivers 65 N net pull at 0.5 MPa and 101.2 N at the 0.7 MPa maximum. The internal spring requires a minimum of 0.2 MPa before the rod moves. Without live air, the spring holds the rod in the fail-safe extended position.
This model has a fixed TPU bumper at each end that decelerates the rod over the last few millimeters, but it is not adjustable. At higher speeds with heavy tooling, meter-out the exhaust or use an external shock absorber. This unit does not include a sensor magnet.
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Related AirTAC PTB Pen-Size Cylinders
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