Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 120mm 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
- Stroke120 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-40
The AirTAC SAIJ125X120-40 is a double-acting ISO 15552 profile cylinder featuring a rear mechanical adjuster that permits up to 40mm of stroke trimming. This creates a usable travel window between 80mm and 120mm, allowing you to dial in the exact retract position during commissioning without bolting on external stops or swapping the unit.
Delivering 6136N of push force and 5734N of pull force at 0.5MPa, this bore size handles heavy loads. It features a SUS420J2 stainless steel rod for enhanced corrosion resistance and operates at 30-500mm/s. The rear screw acts purely as a travel stop to set deceleration, not as a lock; maintaining position without live air requires a SAIL or BSAI variant.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 120 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 SAIJ125AX120-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×120 | 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 SAIJ125AX120-40 Is Used
Machine Changeover
Dial in the 80-120mm travel window during format changeovers to accommodate different product lengths without replacing hardware.
End-Stop Tuning
Fine-tune the final retract position during commissioning to achieve precise mechanical alignment of heavy tooling.
Variable Positioning
Adjust the effective stroke on heavy machinery to set exact deceleration points for varying process requirements.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-40 the Right Cylinder?
Select this 125mm bore when 80mm bore output (2513N at 0.5MPa) is insufficient for your payload, but you need to fine-tune the retract end-point on the fly. The integrated 40mm adjustment window is ideal for product size changeovers on a packaging line. Because it is dimensionally interchangeable per ISO 15552, it replaces standard ISO 15552 cylinders using the same Basic, FA, LB, TC, FTC, TCM1, or TCM2 mounting interfaces.
Configuration specifics for this SKU include PT tapered port threads (G1/2), a 32mm rod with M27x2 threading, and no internal magnet. For load-holding without continuous air pressure, pair this cylinder with an external pilot-operated check valve or switch to an AirTAC SAIL lock variant, as the adjuster cannot hold the load.
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 SAIJ125AX120-40 FAQ
A rear external screw stopper lets you shorten the 120mm nominal stroke by up to 40mm, providing an adjustable travel window of 80-120mm. It sets the travel end and deceleration point, but does not lock the load without continuous air pressure.
At 0.5MPa it provides 6136N of push force and 5734N of pull force. At 0.9MPa, the push force increases to 11045N.
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