Airtac PB Pen-type Cylinder PB12X85CB
The AirTAC Airtac PB Pen-type Cylinder PB12X85CB is a double-acting pen-size (mini) air cylinder with a Ø12mm bore and 85mm stroke. Its slim round barrel and back cover are stainless steel, the M5×0.8 ports keep plumbing compact, and the fast, low-friction piston suits high-cycle small-part handling.
- BoreØ12 mm
- Stroke85 mm
- Port sizeM5×0.8
- Acting typeDouble acting
- Rod threadM10×1.0
- CushionElastic bumper (both ends)
About the Airtac PB Pen-type Cylinder PB12X85CB
The AirTAC PB12X85CB is a JIS pen-size mini cylinder engineered for double-acting operation, delivering a theoretical push of 56.5 N and a pull of 46.7 N at 0.5 MPa. Its slim SUS304 stainless round barrel and screwed-in covers keep weight down for end-of-arm tooling, while the M5x0.8 port ensures reliable pneumatic supply. The CB suffix indicates a double clevis back cover, designed specifically to accommodate pivoting loads.
This 12 mm bore unit features an 85 mm stroke and a Ø5 mm piston rod with an M10x1.0 rod-end thread. It relies on a fixed TPU bumper at each end to decelerate motion over the final few millimeters. Because the bumper is not adjustable, high-speed cycles with real tooling mass require metering out the exhaust or adding an external shock absorber. Plan for a safe working load of roughly 34 N, which is about 60 percent of the 0.5 MPa push rating, to account for seal friction.
Airtac PB Pen-type Cylinder PB12X85CB Technical Specifications
| Model | Airtac PB Pen-type Cylinder PB12X85CB |
|---|---|
| Series | PB JIS pen-size mini cylinder |
| Bore size | Ø12 mm |
| Rod diameter | Ø5 mm |
| Stroke | 85 mm |
| Acting type | Double acting |
| Port size | M5×0.8 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 0.7 MPa |
| Proof pressure | 1.2 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 50 – 800 mm/s |
| Cushion | Elastic bumper (both ends) |
| Max standard stroke | Up to 300 mm |
Specifications follow the official AirTAC PB pen-size datasheet. Piston rod and barrel are stainless steel. Confirm bore, stroke and back-cover option against the product label before installation.
Theoretical Output Force (Ø12mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 56.5 N | 46.7 N |
| 0.7 MPa (max) | 79.1 N | 65.4 N |
Values are taken from the AirTAC PB thrust table. Because pull acts on the rod-side annular area, pull force is always lower than push. Actual usable force is reduced by friction — size with a margin.
Model Code: Airtac PB Pen-type Cylinder PB12X85CB
| PB | JIS pen-size double-acting mini-cylinder series. |
|---|---|
| 12 | Bore size in mm. |
| ×85 | Stroke length in mm. |
| S | Built-in magnet for magnetic-switch position sensing (omit = no magnet). |
| CB / U / R | Back cover: CB double clevis, U 90° side inlet, R axial inlet (bore-dependent). |
Mounting accessories: LB, FA, CJ. Related PB-family variants: PSB (single-acting push), PTB (single-acting pull), PBD (double rod), PBJ (adjustable stroke), PBR (front-mount).
Where the Airtac PB Pen-type Cylinder PB12X85CB Is Used
Gripper Jaw Actuation
Drives the moving fingers on robotic grippers handling small electronic connectors, where the 2.9 kg vertical lift capacity easily manages lightweight part transfer.
Package Diverter Arm
Pivots a deflector plate on a packaging line via the CB double clevis to sort small cartons, utilizing the 56.5 N push force to overcome side friction.
Textile Yarn Guide
Shifts thread guides back and forth on a weaving loom, benefiting from the slim 12 mm profile to fit within densely packed machinery frames.
Is the Airtac PB Pen-type Cylinder PB12X85CB the Right Cylinder?
When sizing this actuator, consider stepping down to the 10 mm bore if your application requires less force, as it provides 39.3 N of push at 0.5 MPa. If your mechanism demands more power, the 16 mm bore offers 100.5 N at the same pressure. For the PB12X85CB specifically, verify your ordering essentials: 12 mm bore, 85 mm stroke, M5x0.8 port, no sensor magnet, and the CB double clevis mount.
Keep in mind that a standard pen-type body does not hold its position if air pressure drops or the valve is centered; the piston will drift. If your pivoting mechanism must freeze in place during an air loss event, integrate an external stop or a dedicated rod lock.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Slim pen body vs. a standard round cylinder
- ✓ Back cover: CB / U / R inlet direction
- ✓ Magnet (S) for sensors?
- ✓ Mounting: LB / FA / CJ or front thread
- ✓ Keep the load coaxial — avoid side load
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 0.7 MPa operating pressure.
- check Keep the load coaxial; avoid side load on the thin rod.
- check Do not dismantle the front or back cover.
- check Fit dust caps to ports during long-term storage.
- check Installation by qualified personnel per AirTAC docs.
Airtac PB Pen-type Cylinder PB12X85CB FAQ
At 0.5 MPa, the push force is 56.5 N and the pull force is 46.7 N. At the maximum operating pressure of 0.7 MPa, the push is 79.1 N and the pull is 65.4 N. The cylinder operates between 0.15 and 0.7 MPa, runs at speeds of 50-800 mm/s, and has a proof pressure of 1.2 MPa.
The CB suffix denotes a double clevis back cover that allows the cylinder to pivot smoothly during extension and retraction. Impact at the stroke ends is managed by a fixed TPU bumper that decelerates the piston over the last few millimeters; it is not adjustable, so high-energy cycles may require metering out the exhaust or adding an external shock absorber.
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