Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-75 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 SAIJ125AX155-75
The AirTAC SAIJ125X155-75 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a robust 6136N push force at 0.5 MPa, making it suitable for heavy-duty handling tasks. By featuring a PT tapered port thread and a SUS420J2 stainless steel rod, it provides reliable corrosion resistance for demanding environments.
This model features a 155mm nominal stroke that can be fine-tuned backward by up to 75mm, yielding a usable travel window of 80-155mm. This wide adjustment band allows operators to dial in exact end positions during commissioning or product changeovers without swapping the cylinder. The extruded aluminum barrel includes sensor grooves on both sides, ready to accept CMSE reed or DMSE electronic sensors if a magnet is specified later.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-75 |
|---|---|
| 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 SAIJ125AX155-75
| 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 SAIJ125AX155-75 Is Used
Variable End-Stop Tuning
Dial in the exact retract position within the 80-155mm window during machine setup, providing precise end-position tuning without adding external stoppers.
Product Size Changeover
Quickly adapt automated lines to different product sizes by rotating the rear adjuster screw, reducing downtime between production runs.
Machine Commissioning
Fine-tune the travel end during initial commissioning to perfect timing and positioning, avoiding the need to physically swap out cylinders for minor length corrections.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-75 the Right Cylinder?
Choose this 125mm bore when an 80mm cylinder's 2513N push force at 0.5 MPa is insufficient for your load, but you want to avoid stepping up to a 160mm bore. The defining benefit of this SAIJ model over a fixed SAI is the 75mm adjustment range, allowing you to set variable end-stops on the fly. To match this ISO 15552 footprint for a direct replacement, verify the 155mm stroke, 75mm adjustment, PT port thread, and the required mounting style. Note that the SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR options.
Because the 155mm stroke is below the 300mm threshold, external side-load guides are less critical here, though the 32mm rod diameter still handles high mechanical stress well. Remember that the rear adjuster acts only as a travel stop to set deceleration, not as a lock; the cylinder cannot hold a load without live air. For true load-holding without pressure, consider an external rod lock, a pilot-operated check valve, or AirTAC SAIL and BSAI series cylinders.
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 SAIJ125AX155-75 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides a push force of 6136N and a pull force of 5734N. At 0.9 MPa, the push force increases to 11045N.
The rear adjuster acts as a mechanical stop that lets you trim the 155mm nominal stroke back by up to 75mm. This creates a usable travel window of 80-155mm, allowing you to set the exact retract position without changing the cylinder.
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