Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-50 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 SAIJ125AX270-50
The AirTAC SAIJ125X270-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a usable travel window of 220 to 270 mm. It delivers 6136 N of push force and 5734 N of pull force at 0.5 MPa, making it suitable for heavy-duty positioning tasks.
This variant uses an SUS420J2 stainless steel rod (code A) for improved corrosion resistance compared to standard carbon steel. The rear stopper screw allows precise end-position tuning during commissioning without adding external stops, though it acts only as a travel limit and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-50 |
|---|---|
| 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 SAIJ125AX270-50
| 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 SAIJ125AX270-50 Is Used
Product Changeovers
Dial in the 220 to 270 mm travel window during format changes on packaging lines without physically replacing the cylinder.
Heavy Fixture Positioning
Leverage 6136 N of thrust at 0.5 MPa to move heavy machining fixtures, using the rear stopper to fine-tune the clamping endpoint.
Commissioning Calibration
Trim up to 50 mm of stroke during initial machine setup to perfectly align mechanical stops without machining external spacers.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-50 the Right Cylinder?
Choose this 125 mm bore when a 100 mm cylinder (providing 3927 N push at 0.5 MPa) lacks the thrust for moving heavy fixtures, but a 160 mm bore is physically too large. The 50 mm adjustment range is ideal for product changeovers, letting you dial in the exact end-of-stroke position on the fly instead of swapping out a fixed-stroke SAI cylinder.
When ordering, confirm the PT tapered port thread, your required mounting set (Basic, FA, LB, TC, FTC, TCM1, or TCM2), and note that this SAIJ model ships without a magnet. Because the nominal stroke is 270 mm, ensure adequate external guiding to prevent excessive side-loading on the rod. For applications requiring the load to be held without continuous air pressure, select a SAIL or BSAI locking cylinder 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 SAIJ125AX270-50 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 screw acts as a mechanical stop, allowing you to shorten the effective stroke from the nominal 270 mm down to 220 mm. It sets the travel end position but does not lock or hold the load without continuous air pressure.
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Standard models usually ship in 3-4 days.
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