Airtac PTBR Single Acting Square Head Compact Cylinder PTBR8X15SR
The AirTAC Airtac PTBR Single Acting Square Head Compact Cylinder PTBR8X15SR is a single acting, pull type (spring extend) pen-size mini cylinder with direct front-cover mounting (M4×0.7 thread). A single air port drives the pull stroke on a Ø8mm bore, 15mm stroke; the return spring resets the rod when air is released.
- BoreØ8 mm
- Stroke15 mm
- Port sizeM5×0.8
- Front-mount threadM4×0.7
- Acting typePull, single acting
- 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 PTBR Single Acting Square Head Compact Cylinder PTBR8X15SR
The AirTAC PTBR8X15SR is a JIS pen-size single-acting pull cylinder with a 15 mm stroke. Air entering the M5x0.8 port retracts the Ø4 mm rod, while a spring pushes it back out. This provides 12.4 N of net pull at 0.5 MPa. The fail-safe extended design ensures the rod stays out on air loss, making it ideal for tensioning or hold-open tasks.
It bolts directly to a fixture via the front-cover M4x0.7 thread, saving space without extra brackets. The SUS316L stainless barrel resists corrosion, and a fixed TPU bumper cushions the end of travel. Because pull acts on the rod-side area, this force is lower than a matching push cylinder. The built-in magnet (-S) supports reed or electronic switches for position sensing.
Airtac PTBR Single Acting Square Head Compact Cylinder PTBR8X15SR Technical Specifications
| Model | Airtac PTBR Single Acting Square Head Compact Cylinder PTBR8X15SR |
|---|---|
| Series | PTBR JIS pen-size front-mount cylinder |
| Bore size | Ø8 mm |
| Rod diameter | Ø4 mm |
| Stroke | 15 mm |
| Acting type | Single acting, pull type (spring extend) |
| Front-mount thread | M4×0.7 |
| 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 60 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 (M4×0.7); barrel is SUS316L. Forces below are NET spring-deducted values. Confirm against the product label.
Net Pull Force (Ø8mm)
| Pressure | Net pull force |
|---|---|
| 0.5 MPa | 12.4 N |
| 0.7 MPa (max) | 19.9 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 PTBR8X15SR
| PTBR | JIS pen-size front-mount single acting, pull type (spring extend) series. |
|---|---|
| 8 | Bore size in mm. |
| ×15 | 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 (M4×0.7). Related PBR-family variants: PBR (double acting), PSBR (single-acting push).
Where the Airtac PTBR Single Acting Square Head Compact Cylinder PTBR8X15SR Is Used
Hold-Down Clamp
Uses spring pressure to keep a clamp open safely. Air pulls the rod back to grip parts, returning to the extended state if air drops.
Tensioning Jig
Maintains steady tension on a belt or wire. The direct M4x0.7 mount bolts straight to the frame for a compact setup.
Retract-to-Open Gate
Holds a diverting gate open by default. A pneumatic signal pulls the gate closed, with fail-safe extension if pressure is lost.
Is the Airtac PTBR Single Acting Square Head Compact Cylinder PTBR8X15SR the Right Cylinder?
This 8 mm bore provides 12.4 N net pull at 0.5 MPa and 19.9 N at 0.7 MPa. Stepping down to a 6 mm bore yields 7.1 N, while a 10 mm bore offers 23.5 N at 0.5 MPa. Plan for a safe working load of roughly 7 N (about 60% of the 0.5 MPa rating) to account for seal friction. For vertical lifts, expect to hold or pull about 0.6 kg with a 2:1 safety margin.
The direct M4x0.7 front mount simplifies installation, and the spring ensures fail-safe extension. The thin Ø4 mm rod handles coaxial thrust well, but add an external guide for any off-axis loads. Confirm your need for the R axial inlet and position switches when ordering.
Quick checklist
- ✓ Net pull force at your working pressure
- ✓ Bolt directly through the front cover (M4×0.7)
- ✓ Only one air line / solenoid needed
- ✓ Fail-safe extend on air loss
- ✓ Magnet (S) for sensors?
- ✓ Stroke ≤ 60 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 PTBR8X15SR FAQ
It delivers 12.4 N net pull at 0.5 MPa and 19.9 N at 0.7 MPa. Because it is spring-extended, a minimum operating pressure of 0.2 MPa is required to overcome the spring and retract the rod.
It mounts directly via the front-cover M4x0.7 thread. The -S suffix indicates a built-in piston magnet compatible with reed or electronic switches, and the SUS316L stainless barrel handles demanding environments.
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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 PTBR Pen-Size Cylinders
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