Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 55mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ125 mm
- Stroke55 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-30S
The AirTAC SAIJ125X55-30-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 25 to 55 mm. Built with a carbon steel piston rod and a PT tapered port, it delivers 6136 N of pull force at 0.5 MPa, making it well-suited for heavy-duty positioning tasks.
Because this is an adjustable-stroke variant rather than a fixed-stroke SAI model, you can fine-tune the end position during commissioning without adding external stops. The included magnet supports CMSE reed and DMSE electronic sensors, which seat directly into the dual-side barrel grooves for straightforward switching.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 55 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max stroke | Up to 1500 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×55 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-30S Is Used
Machine Changeover
Dial in the 25-55 mm retract position during product size transitions without physically swapping out the entire actuator.
Heavy Clamping
Leverage the 6136 N pull force at 0.5 MPa to secure heavy workpieces while precisely tuning the clamping depth via the rear stopper.
Assembly Line Indexing
Use the integrated magnet with DMSE electronic sensors to confirm end-of-stroke positions on automated assembly conveyors.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-30S the Right Cylinder?
Select this 125 mm bore when an application demands higher thrust than an 80 mm bore (which provides 2268 N pull at 0.5 MPa) but does not require the full capacity of a 160 mm bore. The 30 mm adjustment range is ideal for product-size changeovers on a line, letting operators dial in the exact retract distance on the fly.
For any new build, confirm the ISO 15552 mounting interface matches your old cylinder's footprint exactly, including the PT port thread and the SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that the rear adjuster acts as a travel stop and does not hold the load without live air; for fail-safe load holding, consider an SAIL or BSAI series cylinder instead.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-30S FAQ
The nominal stroke is 55 mm, but the rear adjuster allows you to shorten the effective travel by up to 30 mm, creating a usable stroke window of 25 to 55 mm.
At 0.5 MPa operating pressure, it generates 6136 N of pull force and 8590 N of push force, operating efficiently within the 30-500 mm/s speed range.
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Standard models usually ship in 3-4 days.
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