Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-100
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-100 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 SAIJ125AX155-100
The AirTAC SAIJ125X155-100 is a double-acting ISO 15552 profile cylinder featuring a rear mechanical adjuster that allows you to trim the effective stroke back by up to 100 mm. This yields a usable travel window of 55 to 155 mm, enabling precise end-position tuning at commissioning without adding external stops. It delivers a robust 6136 N push force and 5734 N pull force at 0.5 MPa, making it suitable for heavy-duty positioning tasks.
This variant features a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance compared to standard carbon steel. The extruded aluminum barrel includes sensor grooves on both sides, ready for CMSE reed or DMSE electronic solid-state switches if a magnet is added later. It supports PT tapered port threading and operates at speeds between 30 and 500 mm/s.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-100 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-100 |
|---|---|
| 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 SAIJ125AX155-100
| 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 SAIJ125AX155-100 Is Used
Variable End-Stop Positioning
Dial in the exact clamping distance on heavy fixtures by adjusting the rear stopper from 55 to 155 mm without swapping out the entire actuator.
Product Size Changeover
Quickly adapt automated lines to different part lengths by fine-tuning the retract end position during shift changeovers.
Machine Setup Commissioning
Trim the stroke during initial commissioning to prevent mechanical interference and achieve precise end-of-travel kinematics.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-100 the Right Cylinder?
Select this 125 mm bore when an application requires high force combined with variable end-stops, such as 6136 N of thrust at 0.5 MPa. If you need slightly less force, stepping down to an 80 mm bore provides 2513 N of push force at 0.5 MPa. The adjustable stroke is ideal for machine setups that require frequent product-size changeovers, whereas a fixed SAI cylinder is better for set-and-forget operations.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 155 mm nominal stroke, 100 mm adjustment range, PT port thread, and your required mounting style. SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, omitting FB, CA, CB, and CR options. Because the nominal stroke is under 300 mm, side-load risks are moderate, but the 32 mm rod and M27x2 rod thread handle higher stresses well. Note that the rear adjuster acts only as a travel stop and does not hold the load without live air; for load-holding without pressure, consider an SAIL or BSAI cylinder.
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 SAIJ125AX155-100 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum pressure of 1.0 MPa, it can deliver up to 1251 kgf.
The rear adjuster screw allows you to mechanically shorten the 155 mm nominal stroke by up to 100 mm, creating a usable travel window of 55 to 155 mm. This stopper only limits the travel end and does not lock the load without live air pressure.
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