Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-30 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 SAIJ125AX275-30
The AirTAC SAIJ125X275-30 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 245-275 mm usable travel window, allowing you to trim the nominal 275 mm stroke by up to 30 mm during commissioning. Built with a SUS420J2 stainless steel rod, it delivers 6136 N of push force at 0.5 MPa, making it suitable for heavy-duty positioning tasks.
This model uses PT tapered ports and omits the FB, CA, CB, and CR mounting styles found on some standard cylinders, utilizing a focused set of ISO 15552 mounts (Basic, FA, LB, TC, FTC, TCM1, TCM2). The rear adjuster acts purely as a travel stop for end-position tuning, meaning it will not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-30 |
|---|---|
| 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 SAIJ125AX275-30
| 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 SAIJ125AX275-30 Is Used
Product Changeovers
Dial in the 245-275 mm travel window on the fly to accommodate different product lengths without changing the cylinder.
Heavy Positioning
Leverage the 6136 N push force at 0.5 MPa to move heavy pallets or fixtures into their exact final position.
Machine Setup
Fine-tune the end-stop during initial commissioning to perfect the stroke distance without machining new spacers.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-30 the Right Cylinder?
Choose this 125 mm bore when a 100 mm cylinder (providing 3927 N push at 0.5 MPa) lacks the necessary thrust, but a 160 mm bore (10053 N) would be excessive. The adjustable 245-275 mm window is ideal for product-size changeovers on a line, eliminating the need to physically swap cylinders or add external stopper blocks. For load-holding without continuous air pressure, consider the SAIL or BSAI series instead of relying on this adjuster.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 275 mm stroke, PT port thread, and mounting hardware. Although this 275 mm stroke is within standard limits, always ensure adequate external guiding to handle side loads, as the 32 mm rod diameter requires proper support to prevent binding.
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 SAIJ125AX275-30 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster acts as a mechanical stop that lets you shorten the effective travel from 275 mm down to 245 mm. It is designed for end-position tuning and does not lock the load without live air pressure.
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