Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-10S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-10S 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 SAIJ125AX270-10S
The AirTAC SAIJ125X270-10-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a 260-270 mm usable travel window, allowing you to trim the effective stroke by up to 10 mm during commissioning without swapping the cylinder. Featuring a 125 mm bore, it delivers 6136 N of push force at 0.5 MPa, making it suitable for heavy-duty positioning tasks.
This variant includes a SUS420J2 stainless steel rod (code A) for improved corrosion resistance and features a built-in magnet (-S) for use with CMSE reed and DMSE electronic sensors. The extruded aluminum barrel incorporates sensor grooves on both sides, and the rear adjuster functions strictly as a travel stop for end-position tuning, not as a load-holding lock.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-10S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-10S |
|---|---|
| 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 SAIJ125AX270-10S
| 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 SAIJ125AX270-10S Is Used
Heavy-Duty Positioning
Ideal for moving substantial loads requiring a 260-270 mm travel window, allowing exact end-position tuning during machine assembly.
Product Changeover
Quickly dial in the 10 mm stroke adjustment on packaging lines when handling different product sizes without changing the cylinder.
Automated Pressing
Delivers 6136 N of thrust at 0.5 MPa for pressing applications, with variable air cushions at both ends to decelerate heavy masses.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-10S the Right Cylinder?
Select this 125 mm bore cylinder when an application requires substantial force—6136 N push at 0.5 MPa—and precise end-position tuning. If you need less force, stepping down to a 100 mm bore yields 3927 N; if you need more, a 160 mm bore provides 10053 N. The adjustable 260-270 mm window is ideal for machine setups requiring variable end-stops or product changeovers, offering more flexibility than a fixed-stroke SAI cylinder.
Because this is a 270 mm stroke, ensure adequate external guidance to prevent excessive side-loading on the rod. The rear adjuster only sets the travel end and relies on live air; it will not hold the load pneumatically. For load-holding without air pressure, consider an SAIL locking cylinder or an external rod lock. This model uses PT tapered ports and supports mountings Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125AX270-10S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 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, allowing you to shorten the 270 mm nominal stroke by up to 10 mm, creating a 260-270 mm usable travel window. It is designed for end-position tuning and does not lock the load without live air pressure.
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