Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 325mm 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
- Stroke325 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-75
The AirTAC SAIJ125X325-75 is a double-acting, single-rod ISO 15552 profile cylinder engineered for heavy-duty applications requiring exact end-position tuning. It delivers a robust 6136N push force at 0.5 MPa and features a 325mm nominal stroke that can be precisely dialed back by up to 75mm, yielding a flexible 250-325mm usable travel window. This rear adjuster allows you to trim the retract distance during commissioning without swapping out the entire cylinder.
Built with a carbon steel rod and a G1/2 port, this extruded aluminum profile cylinder integrates variable air cushions at both ends to decelerate massive loads smoothly. The rear stopper mechanism acts purely as a travel end setter, not a load-holding lock, so live air pressure is always required to maintain position. It supports a narrower set of ISO 15552 mounting options—Basic, FA, LB, TC, FTC, TCM1, and TCM2—omitting the FB, CA, CB, and CR variants.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 325 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 SAIJ125X325-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×325 | 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 SAIJ125X325-75 Is Used
Variable End-Stop Machining
Dial in the exact 250-325mm retract distance for multi-stage machining operations without physically changing out cylinder hardware.
Product-Size Changeover
Quickly adapt a heavy-duty conveyor diverter or pusher to handle different package lengths by simply turning the rear adjustment screw.
Heavy Assembly Commissioning
Fine-tune the final seating position of large components during machine setup to prevent crushing forces and ensure perfect alignment.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-75 the Right Cylinder?
Select this 125mm bore when a 100mm bore (providing 3927N push at 0.5 MPa) lacks the necessary thrust, but you want to avoid the added mass of a 160mm unit. The 75mm adjustment range is ideal for production lines running mixed product sizes, enabling rapid changeover by shifting the retract end-stop rather than mechanically repositioning the entire fixture. For holding loads safely without continuous air pressure, you must integrate an external pilot-operated check valve or choose a dedicated locking cylinder like the AirTAC SAIL or BSAI.
Because the 325mm stroke creates a long lever arm on the 32mm rod, external guide rails are strongly recommended to prevent excessive side-loading and premature seal wear. To match this exact ISO 15552 replacement, specify: 125mm bore, 325mm stroke, 75mm adjustment, PT tapered port thread, carbon steel rod, no magnet, and a supported mounting style from the SAIJ subset.
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 SAIJ125X325-75 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. It can reach a maximum push force of 11045N at 0.9 MPa.
The rear adjuster screw lets you shorten the effective stroke by up to 75mm from the 325mm nominal length, creating a 250-325mm travel window. This stopper only sets the end position and does not lock the load without live air pressure.
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