Airtac SAIJ125 Adjustable Cylinder SAIJ125AX40-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX40-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 40mm 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
- Stroke40 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX40-30
The AirTAC SAIJ125X40-30 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. By integrating a 30mm adjustment mechanism onto a 40mm nominal stroke, it yields a highly versatile 10-40mm usable travel window. This allows operators to dial in exact retract end-positions during commissioning without swapping out the physical cylinder.
Built with a SUS420J2 stainless steel piston rod (material code A), it provides enhanced corrosion resistance compared to standard carbon steel. The bore dictates a G1/2 port size with PT tapered threading, while the variable air cushions at both ends manage deceleration. Remember that the rear adjuster acts only as a travel stop, not a load-holding lock; maintaining position requires continuous live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX40-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX40-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 40 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 SAIJ125AX40-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×40 | 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 SAIJ125AX40-30 Is Used
Machine Changeover
Dial in the exact retract distance within the 10-40mm window when switching between product sizes on a shared production line.
End-Stop Calibration
Fine-tune the final resting position during machine commissioning without machining custom external spacers or stopper blocks.
High-Force Positioning
Leverage the 6136N push force at 0.5 MPa to move heavy jigs into a precisely adjusted retracted end-point.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX40-30 the Right Cylinder?
Select this 125mm bore model when an application demands substantial thrust—stepping down to an 80mm bore drops the 0.5 MPa push force to 2513N, whereas this SAIJ provides 6136N. The adjustable 10-40mm travel window is perfect for product changeovers on a line where exact end-stops vary slightly between parts, eliminating the need to physically fabricate external stops or buy multiple fixed-stroke SAI cylinders.
When matching ISO 15552 dimensions for a replacement, verify the 40mm stroke, 30mm adjustment range, PT port thread, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2—omitting FB, CA, CB, CR). Because this model lacks the -S magnet suffix, it cannot host CMSE reed or DMSE electronic sensors directly. If the machine requires true fail-safe load holding without air pressure, consider the SAIL or BSAI series instead.
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 SAIJ125AX40-30 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder generates 6136N of push force and 5734N of pull force. It can reach up to 11045N push force at 0.9 MPa.
The rear adjuster screw lets you trim the effective travel by up to 30mm from the 40mm nominal stroke, creating a 10-40mm usable window. The adjuster sets the retract end-position but does not lock the load without live air pressure.
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