Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-10
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-10 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 270mm 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
- Stroke270 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-10
The AirTAC SAIJ125X270-10 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. It features a 32mm SUS420J2 stainless steel rod and PT tapered port threads. By integrating an external adjusting screw, this model provides a usable travel window of 260-270mm, allowing you to fine-tune the retract end position by up to 10mm without swapping out the entire unit.
This adjustable-stop design is perfect for machine setups requiring precise end-position tuning during commissioning or product changeovers. The extruded aluminum barrel includes sensor grooves on both sides, ready for CMSE reed or DMSE electronic switches if a magnet is added later. Remember that the rear adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-10 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-10 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 270 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 SAIJ125AX270-10
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×270 | 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 SAIJ125AX270-10 Is Used
Product Size Changeovers
Quickly dial in the 10mm stroke adjustment during line format changes, shifting the 260-270mm travel window to accommodate varying product lengths without changing hardware.
End-Position Tuning
Fine-tune the retract stop during machine commissioning to achieve exact mechanical positioning, leveraging the 6136N thrust for heavy-duty forming or clamping.
High-Force Positioning
Utilize the robust 125mm bore and 32mm SUS420J2 stainless rod to move heavy payloads reliably, making precise end-stop adjustments directly at the cylinder.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-10 the Right Cylinder?
Select this 125mm bore cylinder when an application demands high thrust (6136N push at 0.5 MPa) alongside precise end-stop tuning, stepping up from a 100mm bore that yields 3927N. The 10mm adjustment window is ideal for dialing in exact positions during product size changeovers, offering more flexibility than a fixed-stroke SAI cylinder. For an exact ISO 15552 replacement, match the 125mm bore, 270mm stroke, PT port threads, and SUS420J2 rod material.
Because the stroke is 270mm, ensure adequate external guidance to prevent excessive side-loading on the 32mm rod. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting FB, CA, CB, and CR. If your process requires true load-holding without continuous air pressure, consider the SAIL or BSAI series instead, as the SAIJ adjuster is not a locking mechanism.
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 SAIJ125AX270-10 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjusting screw acts as a mechanical stopper, allowing you to shorten the effective stroke from its 270mm nominal length down to 260mm. This creates a 260-270mm travel window for fine-tuning the end position without needing external stops.
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