Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 250mm 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
- Stroke250 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-75
The AirTAC SAIJ125X250-75 is a double-acting ISO 15552 profile cylinder with a rear stroke adjuster, delivering a robust 6136N push force at 0.5 MPa. It features a SUS420J2 stainless steel rod (code A) for enhanced corrosion resistance and PT tapered port threads. The built-in rear stopper allows you to dial back the nominal 250 mm stroke, providing a usable travel window of 175 to 250 mm without adding external stops.
This adjustable-stroke design is ideal for fine end-position tuning during commissioning or product changeovers. The rear adjuster acts purely as a mechanical stop to set the travel end alongside the variable air cushions; it is not a lock and cannot hold the load without live air. For load-holding without pressure, consider the SAIL or BSAI series instead. The extruded aluminum barrel includes sensor grooves on both sides, ready for CMSE reed or DMSE electronic sensors if a magnet is specified later.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 250 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 SAIJ125AX250-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×250 | 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 SAIJ125AX250-75 Is Used
Product Changeover
Dial in the 175 to 250 mm travel window during line changeovers to accommodate different material lengths without swapping the cylinder.
Variable End Stops
Use the rear mechanical stopper to fine-tune the exact retraction position during machine setup, avoiding the need for external shims.
Heavy Assembly Press
Leverage the 6136N thrust at 0.5 MPa for pressing operations while retaining the flexibility to adjust the stroke end for various jig heights.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-75 the Right Cylinder?
Choose this 125 mm bore when you need heavy thrust (6136N push at 0.5 MPa) and on-the-fly end-position adjustments. If your application requires less force, stepping down to a 100 mm bore yields 3927N at 0.5 MPa. Conversely, upgrading to a 160 mm bore provides 10053N. The SAIJ125X250-75 is selected over a fixed-stroke SAI cylinder when a 175 to 250 mm adjustable travel window is required to accommodate varying product sizes on a single line.
When replacing an ISO 15552 cylinder, verify the 125 mm bore, 250 mm stroke, 75 mm adjustment range, PT G1/2 port, and mounting style. SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, omitting FB, CA, CB, and CR. Because the stroke is 250 mm, ensure adequate external guiding to handle side loads, as the 32 mm rod and M27x2 thread carry limits on unsupported loads.
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 SAIJ125AX250-75 FAQ
The rear adjuster acts as a mechanical stop that shortens the effective travel. For this model, you can trim the 250 mm nominal stroke back by up to 75 mm, creating a usable travel window of 175 to 250 mm.
At 0.5 MPa operating pressure, the 125 mm bore generates a push force of 6136N and a pull force of 5734N. It operates at a speed range of 30-500 mm/s.
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