Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-20S 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 SAIJ125AX270-20S
The AirTAC SAIJ125X270-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to fine-tune the end position during commissioning. Based on a 270 mm nominal stroke, the external stopper provides a usable travel window of 250-270 mm, letting you dial in the exact retract distance without adding external stops. It delivers 6136 N of push force at 0.5 MPa and features a PT tapered port thread.
This unit includes a SUS420J2 stainless steel rod (code A) for superior corrosion resistance and carries the -S magnet option for seamless integration with AirTAC CMSE reed and DMSE electronic sensors. The extruded aluminum barrel includes sensor grooves on both sides, and the mounting interface supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 attachments.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-20S |
|---|---|
| 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 SAIJ125AX270-20S
| 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 SAIJ125AX270-20S Is Used
Product Changeovers
Dial in the 250-270 mm travel window during format size changes on packaging lines without physically swapping cylinders or adding mechanical shims.
End-Stop Tuning
Fine-tune the retract position at machine commissioning to achieve precise mating of heavy components, utilizing the 6136 N thrust capacity.
Heavy Assembly Stations
Leverage the robust SUS420J2 stainless rod and adjustable end-position to securely press and locate heavy industrial parts during automated assembly.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-20S the Right Cylinder?
Choose this 125 mm bore when an 80 mm bore (providing 2513 N push at 0.5 MPa) cannot meet your thrust requirements, but you want to avoid stepping up to a 160 mm bore. The adjustable stroke is ideal for product-size changeovers on a line, offering variable end-stops without swapping the entire cylinder. If you need to hold a load without live air pressure, note that the rear adjuster acts only as a travel stop, not a lock; you should explore an AirTAC SAIL or BSAI cylinder instead.
For an exact ISO 15552 replacement match, verify the 125 mm bore, 270 mm stroke, 20 mm adjustment range, PT port thread, and the -S magnet. Because the 270 mm stroke exceeds 300 mm is false here, but any long unsupported stroke still requires external guide rails to prevent side-loading damage to the 32 mm rod.
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 SAIJ125AX270-20S 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 shortens the effective travel. For this SAIJ125X270-20-S, the 20 mm adjustment range creates a usable travel window of 250-270 mm from the 270 mm nominal stroke, allowing precise end-position tuning without replacing the cylinder.
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