Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-30S 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 SAIJ125AX155-30S
The AirTAC SAIJ125X155-30-S is a double-acting ISO 15552 profile cylinder engineered with a rear mechanical stopper, allowing you to dial back the nominal 155 mm stroke by up to 30 mm. This creates a highly versatile 125-155 mm usable travel window, perfect for fine-tuning end positions during commissioning without swapping out the entire actuator. Delivering a robust 6136 N push force at 0.5 MPa, it is built to handle demanding industrial loads.
This specific SKU features a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance and pairs with PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, and because this model carries the -S magnet option, it is fully compatible with AirTAC CMSE reed and DMSE electronic solid-state switches for precise position feedback.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-30S |
|---|---|
| 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 SAIJ125AX155-30S
| 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 SAIJ125AX155-30S Is Used
Machine Changeover
Rapidly adjust the 125-155 mm travel window during product size changeovers on a packaging line, using the rear stopper to set new end positions without adding external physical stops.
End-Position Tuning
Fine-tune the exact retracted position during machine commissioning to align heavy 6000 N clamping forces perfectly, dialing in the final 30 mm of travel mechanically.
Variable Assembly Stops
Accommodate multiple part lengths on a single conveyor station by adjusting the cylinder's effective stroke on the fly, maximizing flexibility without changing the actuator.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-30S the Right Cylinder?
Choose this 125 mm bore when your application requires substantial thrust—stepping down to a 100 mm bore drops the 0.5 MPa push force to 3927 N, while moving up to a 160 mm bore increases it to 10053 N. The adjustable stroke is ideal for product changeovers or variable end-stop requirements, whereas a fixed-stroke SAI cylinder is sufficient for repetitive single-purpose tasks. Mounting options are restricted to a specific subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR). To replace an ISO 15552 cylinder, match the 125 mm bore, 155 mm stroke, 30 mm adjuster, PT G1/2 port, and -S magnet.
Because the 155 mm stroke is relatively short, side-load risks are minimal, but the 32 mm rod diameter still requires external guiding if subjected to heavy lateral forces. Remember that the rear adjuster acts only as a travel stop and the air cushions handle deceleration; neither will hold the load without live air pressure. For true load-holding, integrate an external rod lock or 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 SAIJ125AX155-30S FAQ
At a 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. If you increase the pressure to 0.7 MPa, the push force rises to 8590 N.
The rear adjusting screw acts as a mechanical stopper that allows you to shorten the 155 mm nominal stroke by up to 30 mm, creating a 125-155 mm usable travel window. The adjuster only sets the end position and does not lock or hold the load without continuous air pressure.
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