Airtac PTB Single Acting Pen-Type Cylinder PTB12X45SR
The AirTAC Airtac PTB Single Acting Pen-Type Cylinder PTB12X45SR is a single acting, pull type (spring extend) pen-size mini cylinder with a Ø12mm bore and 45mm 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.
- BoreØ12 mm
- Stroke45 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 PTB12X45SR
The AirTAC PTB12X45SR is a JIS pen-size single-acting pull cylinder where air retracts the rod and an internal spring pushes it back out. It provides 33.1 N of net pull at 0.5 MPa and 51.8 N at 0.7 MPa, acting on the smaller rod-side area. This slim SUS304 stainless body includes a built-in piston magnet for position sensing.
Plumbing is simplified to one M5x0.8 port and one solenoid line. A fixed TPU bumper cushions the stroke ends. For practical sizing, plan for about 20 N of real work (roughly 60% of the 0.5 MPa rating) to account for seal friction. The fail-safe extended state is ideal for holding parts when air pressure drops.
Airtac PTB Single Acting Pen-Type Cylinder PTB12X45SR Technical Specifications
| Model | Airtac PTB Single Acting Pen-Type Cylinder PTB12X45SR |
|---|---|
| Series | PTB JIS pen-size mini cylinder |
| Bore size | Ø12 mm |
| Rod diameter | Ø5 mm |
| Stroke | 45 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 (Ø12mm)
| Pressure | Net pull force |
|---|---|
| 0.5 MPa | 33.1 N |
| 0.7 MPa (max) | 51.8 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 PTB12X45SR
| PTB | JIS pen-size single acting, pull type (spring extend) mini-cylinder series. |
|---|---|
| 12 | Bore size in mm. |
| ×45 | 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 PTB12X45SR Is Used
Hold-Down Clamp
Keeps a workpiece clamped under spring pressure. Air retracts the pin to release the part, ensuring a safe extended hold if air fails.
Belt Tensioner
Applies steady pull tension on a moving belt. The single-acting design uses one air line to modulate the retraction force.
Retract-to-Open Gate
Pulls a lightweight diverter gate closed on actuation. The spring automatically opens the gate to a safe home position on exhaust.
Is the Airtac PTB Single Acting Pen-Type Cylinder PTB12X45SR the Right Cylinder?
This 12 mm bore generates 33.1 N net pull at 0.5 MPa. If your task needs less force, the 10 mm bore offers 23.5 N; stepping up to the 16 mm bore yields 65.0 N. The internal return spring requires a minimum 0.2 MPa pressure to overcome its resistance before retraction motion begins.
The 45 mm stroke sits well within the 60 mm single-acting limit. The axial R back cover allows inline tubing. Because the Ø5 mm rod is slender over this length, add an external linear bearing for any off-axis loads. The -S suffix enables reed or electronic switch mounting.
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 PTB12X45SR FAQ
The net pull force is 33.1 N at 0.5 MPa and 51.8 N at 0.7 MPa. Because the internal spring opposes motion, a minimum pressure of 0.2 MPa is required before the rod begins to retract.
It uses a fixed TPU bumper at each end to decelerate the last few millimeters of travel; for high tooling mass, add an external shock absorber. The -S suffix means a built-in magnet for reed or electronic switches.
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Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
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Most inquiries answered within 7-8 hours.
Related AirTAC PTB Pen-Size Cylinders
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