Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-50S 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 SAIJ125AX155-50S
The AirTAC SAIJ125X155-50-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 105-155 mm usable travel window, letting you dial back the nominal 155 mm stroke by up to 50 mm during commissioning without adding external stops. It delivers a robust 6136 N pull force at 0.5 MPa.
This specific SKU includes a SUS420J2 stainless steel rod (code A) for enhanced corrosion resistance and a magnet (-S) for use with AirTAC CMSE reed or DMSE electronic sensors. The extruded aluminum barrel incorporates sensor grooves on both sides, and the rear adjuster acts purely as a travel stop, meaning it will not hold a load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-50S |
|---|---|
| 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 SAIJ125AX155-50S
| 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 SAIJ125AX155-50S Is Used
Product Changeovers
Quickly shift the end-stop by up to 50 mm to accommodate varying package lengths on a packaging line without physically swapping the actuator.
Machine Setup
Fine-tune the final retract position during initial commissioning to perfectly align a 6136 N press operation without machining new spacer blocks.
Variable End Stops
Dial in the exact 105 to 155 mm travel distance required for diverting different product sizes on a conveyor sorting system.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-50S the Right Cylinder?
Selecting this 125 mm bore cylinder makes sense when your application requires the 6136 N pull force at 0.5 MPa and demands frequent product-size changeovers. If your thrust requirements are lower, stepping down to an 80 mm bore yields 2268 N pull force. Because the standard SAIJ rear adjuster and air cushions only decelerate the travel end, you must use an external rod lock, SAIL, or BSAI cylinder if the machine needs to hold a vertical load without continuous air pressure.
To match this ISO 15552 interchangeable cylinder exactly, confirm the 125 mm bore, 155 mm nominal stroke, 50 mm adjustment range, PT tapered port thread, and the -S magnet option. Since the 155 mm stroke is relatively long for this bore size, ensure your setup includes an external guide rail to prevent excessive side-loading on the 32 mm rod.
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 SAIJ125AX155-50S FAQ
The rear adjuster allows you to shorten the effective stroke by up to 50 mm, creating a usable travel window of 105 to 155 mm. It functions as a mechanical stop to set the end position and does not lock the load without live air pressure.
At 0.5 MPa operating pressure, it provides 6136 N of push force and 5734 N of pull force. It can reach a maximum push force of 11045 N at 0.9 MPa.
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Standard models usually ship in 3-4 days.
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