Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-100
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-100 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 SAIJ125AX270-100
The AirTAC SAIJ125X270-100 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It delivers 6136N of push force at 0.5MPa, scaling up to 11045N at 0.9MPa. This unit features a SUS420J2 stainless steel rod (option A) and PT tapered port threads, providing robust corrosion resistance for demanding environments.
Equipped with a 100mm adjustment mechanism, the nominal 270mm stroke can be fine-tuned down to 170mm. This creates a 170-270mm usable travel window, allowing you to dial in exact end positions during commissioning without adding external stops. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE reed or DMSE electronic switches.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-100 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-100 |
|---|---|
| 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 SAIJ125AX270-100
| 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 SAIJ125AX270-100 Is Used
Product Changeovers
Dial in the 170-270mm travel window during format changes on packaging lines, avoiding the need to physically swap out cylinders for different carton sizes.
Commissioning Calibration
Fine-tune the retract end-position during machine setup, using the rear stopper to absorb minor mechanical variances without reprogramming fixed stops.
Heavy-Duty Forming
Leverage the 11045N output force at 0.9MPa for pressing and clamping tasks, utilizing the SUS420J2 stainless rod for resistance against harsh industrial fluids.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-100 the Right Cylinder?
Choose this 125mm bore when an 80mm cylinder (providing 2513N push at 0.5MPa) lacks the necessary thrust, but a 160mm bore (10053N) is physically oversized. The 100mm adjustment range is ideal for machines handling frequent product-size changeovers, replacing fixed-stroke SAI cylinders when a variable end-stop is required. Note that the rear adjuster acts only as a travel stop; it will not hold a load without live air pressure. For fail-safe load holding, consider the SAIL or BSAI series.
When matching ISO 15552 dimensions for a retrofit, verify the 125mm bore, 270mm stroke, 100mm adjuster, PT port threads, and your required mounting style. SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts. Because the stroke is 270mm, ensure an external guide is used to prevent excessive side-loading on the 32mm 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 SAIJ125AX270-100 FAQ
At 0.5MPa, it provides 6136N of push force and 5734N of pull force. At 0.9MPa, the push force increases to 11045N and the pull force to 8590N.
The rear adjuster allows you to shorten the effective travel from the nominal 270mm down to 170mm, creating a 170-270mm window. It acts as a mechanical stop to tune the end position, but it is not a lock and will not hold the load without air pressure.
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