Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-100S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-100S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 240mm 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
- Stroke240 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-100S
The AirTAC SAIJ125X240-100-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 140 to 240 mm, allowing you to dial back the nominal stroke by up to 100 mm during machine commissioning or product changeovers without swapping the cylinder. It delivers a robust 6136 N pull force at 0.5 MPa, making it suitable for heavy-duty positioning tasks.
This -S variant includes a magnet for use with AirTAC CMSE reed and DMSE solid-state sensors, fitting into the dual-side extruded aluminum barrel grooves. It uses a PT tapered G1/2 port and a 32 mm carbon steel rod with an M27x2 thread, providing a rigid interface that handles high side loads well. The mounting set covers Basic, FA, LB, TC, FTC, TCM1, and TCM2 options.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-100S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-100S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 240 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 SAIJ125X240-100S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×240 | 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 SAIJ125X240-100S Is Used
Product Size Changeovers
Dial in the exact end-position for different package lengths on a single conveyor line using the 100 mm adjustment window, eliminating the need to physically swap out cylinders during production runs.
Heavy-Duty Positioning
Leverage the 6136 N pull force at 0.5 MPa to push large pallets or heavy fixtures into a precise machining stop, fine-tuning the final resting position during initial machine setup.
Variable End-Stop Assembly
Use the rear stopper screw to set intermediate travel distances between 140 and 240 mm for multi-stage assembly presses without installing external mechanical stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-100S the Right Cylinder?
Select this 125 mm bore cylinder when your application requires substantial force, stepping up from an 80 mm bore that provides 2268 N pull at 0.5 MPa. The 100 mm adjustment range is ideal for lines running multiple product sizes, as it acts as a variable end-stop. Remember that the rear adjuster is a travel stop, not a lock; it will not hold the load without live air pressure. For true fail-safe load holding, consider the SAIL or BSAI series instead.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 240 mm stroke, 100 mm adjuster, PT G1/2 port, and the -S magnet requirement. Because the usable stroke extends up to 240 mm, ensure your mounting configuration supports the rod adequately to prevent deflection over long distances.
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 SAIJ125X240-100S FAQ
The rear adjuster screw acts as a mechanical stop that limits the piston's retraction. For this model, you can shorten the effective stroke by up to 100 mm, giving you an adjustable travel window between 140 mm and 240 mm without changing the cylinder itself.
At a standard operating pressure of 0.5 MPa, this double-acting cylinder provides 6136 N of pull force and 8590 N of push force. It can deliver a maximum of 1251 kgf at 1.0 MPa.
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