Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-20 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 SAIJ125X270-20
The AirTAC SAIJ125X270-20 is a double-acting ISO 15552 profile cylinder engineered to deliver substantial thrust, providing 6136N push force at 0.5 MPa. It features a 125mm bore, a 270mm nominal stroke, and a PT tapered port thread. By incorporating a rear adjusting screw, this unit allows you to fine-tune the retract end position, creating a usable travel window between 250 and 270mm without adding external stops.
The carbon steel rod and M27x2 thread provide a robust interface for heavy loads, while the extruded aluminum barrel includes sensor grooves on both sides. You can install switches directly without brackets, though this base configuration omits the magnet, requiring a -S suffix if CMSE reed or DMSE electronic sensors are needed. The rear stopper sets the travel limit but does not lock the load; use a SAIL or BSAI cylinder for pilot-operated load holding without live air.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-20 |
|---|---|
| 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 SAIJ125X270-20
| 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 SAIJ125X270-20 Is Used
Heavy Machinery Changeover
Dial in the 250-270mm travel window during product size changes on large equipment, avoiding the need to physically swap out cylinders for different stroke requirements.
Press Positioning
Fine-tune the retract end-stop during commissioning to achieve exact material contact points, utilizing the 6136N force output for heavy pressing and forming tasks.
Guided Load Handling
Move substantial payloads along a 270mm path with external guides, relying on the robust 32mm carbon steel rod to maintain structural integrity under demanding conditions.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X270-20 the Right Cylinder?
Select this 125mm bore when an 80mm cylinder (delivering 2513N push at 0.5 MPa) is undersized, but a 160mm unit is physically too large. The 20mm adjustment range is ideal for product changeovers on heavy machinery, letting you dial in the exact end-of-stroke position at commissioning rather than swapping a fixed-stroke SAI cylinder. As a true profile cylinder, it is dimensionally interchangeable with ISO 15552 mounting interfaces.
For this 270mm stroke, ensure adequate external guiding to prevent excessive side loading on the rod. The available mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR. Operating speed is rated for 30-500 mm/s, supported by 40mm variable air cushions at both ends to decelerate the heavy moving mass smoothly.
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 SAIJ125X270-20 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective stroke by up to 20mm, providing a usable travel window of 250 to 270mm. This stopper only sets the end position and does not hold the load without continuous air pressure.
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