Airtac SAIJ125 Adjustable Cylinder SAIJ125AX290-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX290-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 290mm 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
- Stroke290 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX290-50S
The AirTAC SAIJ125X290-50-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 240-290 mm usable travel window from its 290 mm nominal stroke. It delivers 8590 N of push force at 0.7 MPa, making it suited for heavy-duty positioning tasks. The -S magnet enables position sensing with AirTAC CMSE reed or DMSE electronic solid-state switches in the dual sensor grooves.
This variant uses a SUS420J2 stainless steel rod (material code A) for superior corrosion resistance. The rear adjuster acts purely as a mechanical stop to fine-tune the retract end position during commissioning without adding external stops; it does not hold the load without live air pressure. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX290-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX290-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 290 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 SAIJ125AX290-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×290 | 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 SAIJ125AX290-50S Is Used
Machine Changeover
Dial in the retract end position within the 240-290 mm window during product size transitions without physically swapping cylinders.
Heavy Pressing
Leverage 8590 N of push force at 0.7 MPa for heavy pressing or holding operations, with fine-tuning to prevent overtravel.
End-Stop Tuning
Use the rear stopper screw to precisely set the final position during machine commissioning, eliminating the need for external stop blocks.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX290-50S the Right Cylinder?
Choose this 125 mm bore cylinder when an application requires substantial thrust, stepping up from a 100 mm bore (5497 N at 0.7 MPa) while avoiding the bulk of a 160 mm bore (14074 N). The 50 mm adjustable window is perfect for product changeovers, allowing operators to dial in the exact end position without swapping the cylinder. For any load-holding requirements without continuous air pressure, select a SAIL or BSAI model instead, as this adjuster is not a lock.
To replace an ISO 15552 cylinder, match the 125 mm bore, 290 mm stroke, 50 mm adjustment, PT tapered G1/2 port, and the -S magnet. Because the 290 mm stroke is substantial, long unsupported travel requires an external guide to prevent side-loading damage to the rod and seals.
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 SAIJ125AX290-50S FAQ
At a 0.7 MPa operating pressure, this 125 mm bore cylinder provides 8590 N of push force and 5734 N of pull force. It can reach a maximum push force of 11045 N at 0.9 MPa.
The rear adjuster screw allows you to shorten the effective stroke by up to 50 mm, providing a usable travel window of 240-290 mm. It acts as a mechanical stop to fine-tune the end position and does not lock the load without live air pressure.
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