Airtac SAIJ125 Adjustable Cylinder SAIJ125AX150-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX150-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 150mm 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
- Stroke150 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX150-50S
The AirTAC SAIJ125X150-50-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the 150 mm nominal travel by up to 50 mm for a precise 100-150 mm usable window. It features a SUS420J2 stainless steel rod and an integrated magnet for position sensing. In the 125 mm bore class, it delivers 6136 N of push force at 0.5 MPa and up to 11045 N at 0.9 MPa, making it well-suited for heavy-duty positioning tasks.
Because the adjuster acts purely as a mechanical stop at the retract end, it fine-tunes end positions during commissioning without requiring a cylinder swap or external stops. It is important to note that this stopper does not hold the load dynamically without live air pressure; for true load-holding, you would need an SAIL or BSAI variant. This model includes a PT tapered port (G1/2) and supports AirTAC CMSE reed and DMSE electronic sensors mounted into the dual-side sensor grooves.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX150-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX150-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 150 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 SAIJ125AX150-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×150 | 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 SAIJ125AX150-50S Is Used
Variable End-Stop Positioning
Dial in the exact retract distance between 100 and 150 mm during product changeovers on heavy fixtures without machining new spacer blocks.
Machine Setup Commissioning
Use the rear adjuster to fine-tune the end-of-stroke position precisely during initial commissioning, avoiding the need to swap out the entire cylinder.
Heavy-Duty Forming Press
Leverage the 125 mm bore to deliver up to 11045 N of push force at 0.9 MPa for pressing operations, while setting the exact travel limit via the stopper.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX150-50S the Right Cylinder?
Select this 125 mm bore cylinder when an application requires substantial thrust—such as 8590 N at 0.7 MPa—and a variable end-stop for product changeovers. If your force requirements are lower, stepping down to an 80 mm bore yields 3518 N at 0.7 MPa, whereas stepping up to a 160 mm bore provides 14074 N at 0.7 MPa. The adjustable stroke is chosen over a fixed SAI cylinder when you need on-the-fly end-position tuning during machine setup rather than relying on a fixed dead stop.
When matching ISO 15552 dimensions for a replacement, verify the 125 mm bore, 150 mm stroke, 50 mm adjustment range, PT G1/2 port, and the -S magnet option. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. Since the 150 mm stroke is below the 300 mm threshold, side-load concerns are minimal, but the robust 32 mm rod and M27x2 thread handle higher structural stresses effectively.
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 SAIJ125AX150-50S FAQ
At 0.5 MPa, it provides 6136 N of push force and 5734 N of pull force. At 0.9 MPa, the push force increases to 11045 N.
The rear adjuster screw acts as a mechanical stop that lets you shorten the 150 mm nominal stroke by up to 50 mm, creating a usable travel window of 100 to 150 mm. It only sets the travel end and does not lock the load without live air pressure.
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