Airtac SAIJ125 Adjustable Cylinder SAIJ125AX190-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX190-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 190mm 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
- Stroke190 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX190-50S
The AirTAC SAIJ125X190-50-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. The integrated -50 adjustment code allows you to trim the effective travel back by up to 50 mm, creating a precise 140-190 mm usable window. This eliminates the need to swap hardware during product changeovers. A -S magnet is built in for position detection.
This unit features a SUS420J2 stainless steel rod (option A) for enhanced corrosion resistance and uses PT tapered port threads (G1/2). The extruded aluminum barrel includes sensor grooves on both sides, compatible with AirTAC CMSE reed and DMSE electronic solid-state switches. The rear screw acts purely as a travel stop to fine-tune the end position, meaning it will not hold the load without continuous live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX190-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX190-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 190 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 SAIJ125AX190-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×190 | 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 SAIJ125AX190-50S Is Used
Variable End-Stop Tuning
Dial in the exact 140-190 mm end position during machine commissioning to accommodate different product lengths without machining new hard stops.
Production Line Changeover
Quickly retract the stroke by up to 50 mm when switching manufacturing lines to a new product size, minimizing downtime and mechanical adjustments.
High-Force Positioning
Leverage the 6136N thrust capacity to move heavy fixtures into their final adjusted position, relying on the rear stopper for precise depth control.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX190-50S the Right Cylinder?
Choose this 125 mm bore when an 80 mm cylinder (providing 2513N push at 0.5 MPa) lacks the thrust for your application, but you need to avoid the bulk of a 160 mm bore. The adjustable 140-190 mm window is ideal for machines requiring variable end-stops or frequent setup changes without installing external physical stops. For load-holding without air pressure, you must use an external rod lock or select a SAIL or BSAI cylinder, as the SAIJ adjuster is not a locking mechanism.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 190 mm nominal stroke, 50 mm adjustment range, PT G1/2 port, and -S magnet. Mounting options are limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2. Because the 190 mm stroke is below the 300 mm threshold, side-load stress is moderate, but you should still ensure proper alignment to protect the M27x2 rod thread.
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 SAIJ125AX190-50S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster screw allows you to shorten the 190 mm nominal stroke by up to 50 mm, providing an effective travel window of 140 to 190 mm. This stopper sets the end position but does not lock the load without live air pressure.
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