Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 155mm 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
- Stroke155 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-40
The AirTAC SAIJ125X155-40 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 115 to 155 mm, allowing you to dial back the nominal 155 mm stroke by up to 40 mm during commissioning without adding external stops. In the 125 mm bore class, it generates 6136 N of push force and 5734 N of pull force at 0.5 MPa.
This variant is configured with a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance. The extruded aluminum barrel includes sensor grooves on both sides, and the speed range for this bore is 30-500 mm/s. The rear adjuster acts as a travel stop to set the end position, but it does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 155 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 SAIJ125AX155-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×155 | 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 SAIJ125AX155-40 Is Used
Machine Changeover
Dial in the 115-155 mm travel window during product family swaps without physically replacing the cylinder or bolting on external stoppers.
Variable End-Stop Positioning
Set precise retract end-positions for diverter arms on packaging lines, using the rear screw to trim the stroke exactly to the carton size.
Heavy-Duty Clamping
Leverage the 6136 N push force at 0.5 MPa to hold workpieces, relying on the external stopper to tune the clamp depth perfectly.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-40 the Right Cylinder?
Choose this 125 mm bore when an 80 mm cylinder (providing 2513 N push at 0.5 MPa) is insufficient, but a 160 mm bore (10053 N at 0.5 MPa) would be excessive. The 40 mm adjustment window is ideal for product-size changeovers on a line, letting you fine-tune the retract end-position on the fly instead of swapping to a fixed-stroke SAI cylinder. For load-holding without continuous air pressure, this plain SAIJ is insufficient—use a SAIL pneumatic lock, BSAI clamp-lock, or an external rod lock instead.
To replace an existing ISO 15552 cylinder, match the 125 mm bore, 155 mm nominal stroke, 40 mm adjustment range, PT tapered port thread, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Because the 155 mm stroke is under 300 mm, side-load stress is moderate, but the 32 mm rod and M27x2 thread still require an external guide for heavy radial loads.
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 SAIJ125AX155-40 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 the maximum 1.0 MPa pressure, it delivers up to 1251 kgf.
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective stroke from 155 mm down to 115 mm. It sets the travel end-position but does not lock or hold the load without live air pressure.
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