Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 275mm 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
- Stroke275 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-75
The AirTAC SAIJ125X275-75 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. Its integrated external stopper allows you to dial back the 275mm nominal stroke by up to 75mm, creating a 200-275mm usable travel window. This fine-tuning capability is ideal for adapting end positions during commissioning or product changeovers without swapping the entire actuator.
Built with a carbon steel piston rod and a robust M27x2 rod thread, this 125mm bore unit handles substantial side loads, though long unsupported strokes still require external guiding. It features PT tapered port threads and operates at speeds of 30-500mm/s. The extruded aluminum barrel includes sensor grooves on both sides, supporting CMSE reed and DMSE electronic switches when a magnet is specified.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 275 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 SAIJ125X275-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×275 | 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 SAIJ125X275-75 Is Used
Product Changeovers
Quickly modify the effective stroke from 200 to 275mm on packaging lines to accommodate different carton or product sizes without changing hardware.
End-Position Tuning
Fine-tune the retract end-stop during initial machine commissioning to achieve precise mechanical alignment without adding external stops.
Variable Forming Stops
Adjust the travel limit on the fly for heavy-duty forming or pressing applications that require different material compression depths.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-75 the Right Cylinder?
Selecting this adjustable-stroke model over a fixed SAI cylinder makes sense when your application requires variable end-stops or frequent machine setup adjustments across a 200-275mm range. If your thrust requirements are lower, stepping down to a 100mm bore yields 3927N at 0.5MPa, whereas stepping up to a 160mm bore provides 10053N. Because the stroke exceeds 300mm is not the case here, but at 275mm you should still ensure adequate external guiding to prevent rod binding.
For a true ISO 15552 replacement match, verify the 125mm bore, 275mm stroke, PT port threads, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that the rear adjuster acts only as a travel stop and does not hold the load without live air; for fail-safe load holding, consider the SAIL or BSAI series 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 SAIJ125X275-75 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At its maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster acts as an external mechanical stop that lets you shorten the 275mm nominal stroke by up to 75mm, providing a usable travel window of 200-275mm. It only sets the end position and does not lock the load without continuous air pressure.
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