Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 375mm 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
- Stroke375 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-30S
The AirTAC SAIJ125X375-30-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 375 mm travel by up to 30 mm. This yields a usable end-position window of 345-375 mm, perfect for fine-tuning machinery setups during commissioning without swapping hardware. It delivers substantial thrust, pushing 6136 N and pulling 5734 N at 0.5 MPa.
Featuring a standard carbon steel piston rod and a PT tapered port, this unit includes a magnet for position sensing. The extruded aluminum barrel carries sensor grooves on both sides, supporting AirTAC CMSE reed and DMSE electronic switches. The variable air cushions at both ends manage deceleration, while the external rear stopper acts strictly as a travel limit, not a load-holding lock.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 375 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 SAIJ125X375-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×375 | 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 SAIJ125X375-30S Is Used
Variable End-Stop Setup
Dial in the exact 345-375 mm retract position during machine commissioning to accommodate varying product lengths without replacing the cylinder.
Heavy Assembly Pressing
Leverage the 6136 N push force at 0.5 MPa to seat heavy components, using the rear stopper to fine-tune the final pressing depth.
Automated Line Changeover
Quickly adjust the travel end for different packaging sizes on a production line, utilizing the PT port and standard ISO 15552 mounting footprint.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-30S the Right Cylinder?
Select this 125 mm bore actuator when your application requires heavy push forces up to 8590 N at 0.7 MPa and a variable end-stop. The 30 mm adjustment range is ideal for product changeovers on a line, replacing fixed-stroke SAI cylinders when you need on-the-fly position tuning. If your system requires holding a load without continuous air pressure, the SAIJ adjuster will not suffice; you must integrate an external pilot-operated check valve or switch to an AirTAC SAIL or BSAI locking cylinder.
Because the 375 mm stroke is substantial, the 32 mm diameter carbon steel rod will experience amplified side-load leverage if the load is unsupported. Always guide the load externally to prevent rod binding. For ISO 15552 replacement matching, specify a 125 mm bore, 375 mm stroke, 30 mm adjuster, PT G1/2 port, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2), omitting FB, CA, CB, and CR brackets.
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 SAIJ125X375-30S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides a push force of 6136 N and a pull force of 5734 N. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the 375 mm nominal stroke by up to 30 mm, creating a usable travel window of 345-375 mm. This stopper only limits travel; it does not lock or hold the load without live air pressure.
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