Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-75S 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 SAIJ125AX270-75S
The AirTAC SAIJ125X270-75-S is a double-acting ISO 15552 profile cylinder engineered for high-force applications requiring flexible end-positioning. It delivers a robust 6136N push force and 5734N pull force at 0.5 MPa, utilizing a 32mm PT port for optimal air flow. By integrating a rear-mounted stroke adjuster, this model provides a usable travel window of 195 to 270mm, enabling precise tuning without swapping components.
Equipped with a -S magnet, the cylinder supports AirTAC CMSE reed and DMSE electronic sensors housed within the dual-side extruded aluminum barrel grooves. The piston rod is constructed from SUS420J2 stainless steel (material code A) for superior corrosion resistance, and the mounting interface supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 brackets.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-75S |
|---|---|
| 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 SAIJ125AX270-75S
| 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 SAIJ125AX270-75S Is Used
Product Changeover
Dial in the 195-270mm travel window instantly on the production line when switching between varying package sizes, eliminating the need for physical spacer changes.
High-Force Clamping
Leverage the 6136N push force at 0.5 MPa to securely clamp heavy workpieces, using the rear stopper to fine-tune the exact clamping position without over-travel.
Machine Setup
Achieve precise end-position calibration during initial commissioning, allowing engineers to set optimal retract distances safely before locking down the cycle.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-75S the Right Cylinder?
Selecting this 125mm bore cylinder is ideal when an application demands high thrust alongside variable product changeovers, stepping up from a 100mm bore that yields 3927N push force at 0.5 MPa. The 75mm adjustment range allows operators to dial in the exact retract stop during commissioning, avoiding the need to bolt on external stops or replace a fixed-stroke SAI cylinder. Because the 270mm stroke exceeds 300mm is not applicable here, but for any extended travel, always ensure external guiding to protect the rod from side-load wear.
When specifying a replacement, verify the 125mm bore, 270mm nominal stroke, 75mm adjustment code, PT tapered port threads, and the -S magnet requirement. Remember that the rear adjuster functions strictly as a travel stop to set deceleration alongside the air cushion, not as a locking device. If the machine requires true load-holding without live air pressure, utilize an AirTAC SAIL pneumatic lock, a BSAI clamp-lock cylinder, or an external pilot-operated check valve.
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 SAIJ125AX270-75S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides a push force of 6136N and a pull force of 5734N. At 0.9 MPa, the push force increases to 11045N.
The rear adjuster acts as a mechanical stop that allows you to shorten the effective stroke from its 270mm nominal length down to 195mm. It only sets the travel end and does not lock the load without live air pressure.
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