Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-100
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-100 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 SAIJ125AX250-100
The AirTAC SAIJ125X250-100 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that trims the retract travel by up to 100 mm, creating a precise 150-250 mm usable end-position window. Built with a SUS420J2 stainless steel rod (code A) and PT tapered ports, it delivers 6136 N of push force at 0.5 MPa and operates within a 30-500 mm/s speed range. The extruded aluminum barrel includes dual-side sensor grooves for flexible switch mounting.
This adjustable model lets you fine-tune the end-of-stroke at commissioning or during product changeovers without swapping out the entire cylinder or fabricating external stops. It supports a specific mounting subset including Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR options. The rear adjuster acts strictly as a travel stop to set deceleration, not as a lock to hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-100 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-100 |
|---|---|
| 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 SAIJ125AX250-100
| 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 SAIJ125AX250-100 Is Used
Variable End-Stop Configuration
Dial in the exact retract distance within the 150-250 mm window during machine commissioning to accommodate different material thicknesses without changing hardware.
Product Line Changeover
Quickly adjust the rear stopper by up to 100 mm when switching the production line to a new product size, minimizing downtime and avoiding external stop fabrication.
High-Force Positioning
Leverage the 6136 N push force at 0.5 MPa to move heavy pallets or fixtures into a precise adjustable end position on an automated assembly line.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-100 the Right Cylinder?
Choose this 125 mm bore when your application requires substantial thrust—stepping down to an 80 mm bore drops the 0.5 MPa push force to 2513 N, while this model provides 6136 N. The 100 mm adjustment range is ideal for machinery requiring significant travel flexibility during setup or when accommodating varying product sizes on the same line. Because the 250 mm stroke exceeds 300 mm is not the case here, but for any extended travel, always pair the cylinder with an external guide to handle side loads, as the 32 mm rod and M27x2 thread handle mounting loads but do not eliminate structural leverage forces.
For load-holding requirements without continuous live air, note that this plain SAIJ cylinder does not function as a lock; consider the AirTAC SAIL or BSAI series instead. To match this ISO 15552 interchangeable cylinder, specify: 125 mm bore, 250 mm nominal stroke, 100 mm adjustment range, PT tapered ports, and the desired mounting set. Position sensing requires adding a magnet (-S) to work with AirTAC CMSE reed or DMSE solid-state switches.
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 SAIJ125AX250-100 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. If operating at 0.7 MPa, the push force increases to 8590 N.
The rear adjuster screw acts as an external stop that shortens the effective stroke by up to 100 mm. For this 250 mm nominal stroke model, it provides a usable travel window of 150 to 250 mm, allowing fine-tuning of the retract position without replacing the cylinder.
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