Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-10
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-10 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 SAIJ125AX120-10
The AirTAC SAIJ125X120-10 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 110-120 mm usable travel window, letting you dial back the nominal 120 mm stroke by up to 10 mm during commissioning without adding external stops. It delivers 6136 N push force at 0.5 MPa, making it suited to heavy-duty positioning.
This variant uses a SUS420J2 stainless steel rod (option A) for corrosion resistance and has PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides. Note that the rear adjuster is a travel stop, not a lock; it will not hold the load without live air.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-10 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-10 |
|---|---|
| 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 SAIJ125AX120-10
| 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 SAIJ125AX120-10 Is Used
Machine Setup Tuning
Fine-tune the 110-120 mm retract end-stop during initial machine commissioning to dial in exact positioning without swapping cylinders.
Product Changeover
Quickly adapt the stroke end-position on automated lines when product sizes change, using the 10 mm rear adjustment screw.
Heavy Clamping Stops
Leverage the 6136 N push force to secure heavy workpieces, adjusting the clamping depth precisely via the rear stopper.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-10 the Right Cylinder?
Choose this 125 mm bore when 80 mm (2513 N at 0.5 MPa) is insufficient, or step down if an 80 mm bore offers enough thrust. An adjustable stroke is ideal for fine-tuning the retract end on product changeovers. For load-holding without live air, use an SAIL or BSAI cylinder instead.
For a true ISO 15552 replacement, match the 125 mm bore, 120 mm stroke, 10 mm adjuster, PT port, and mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). At 120 mm stroke, side-load is minimal, but always guide the load for long unsupported travels.
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 SAIJ125AX120-10 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 120 mm nominal stroke by up to 10 mm. This creates a 110-120 mm usable travel window for exact end-position tuning without adding external stops.
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