Airtac SAIJ125 Adjustable Cylinder SAIJ125X145-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X145-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 145mm 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
- Stroke145 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X145-40
The AirTAC SAIJ125X145-40 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers substantial thrust, providing 6136N of pull force and 8590N of push force at 0.7 MPa. By turning the external adjustment screw, you can shorten the effective travel from its 145mm nominal length, creating a 105-145mm usable stroke window. This allows for precise end-position tuning during commissioning without swapping out the entire cylinder.
This model features a 32mm carbon steel piston rod with an M27x2 thread, designed to handle significant side loads, though long unsupported strokes still require an external guide. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE reed or DMSE electronic sensors. Additionally, the SAIJ series utilizes a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR options found on other variants.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X145-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X145-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 145 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 SAIJ125X145-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×145 | 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 SAIJ125X145-40 Is Used
Machine Setup Calibration
Fine-tune the 105-145mm travel window during initial commissioning to dial in exact end positions without machining external stop blocks.
Product Size Changeovers
Quickly adjust the retract end-position by up to 40mm when a production line switches to a different sized pallet or workpiece.
Heavy Clamping Fixtures
Leverage the 6136N pull force to securely hold heavy components, using the adjustable stop to set the exact clamping depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X145-40 the Right Cylinder?
Choose this 125mm bore cylinder when your application requires heavy force in the 6000N range and on-the-fly stroke adjustments. If you need slightly less force, stepping down to an 80mm bore yields 2268N of pull force at 0.5 MPa, whereas stepping up to a 160mm bore provides 9425N of pull force. The adjustable stroke is perfect for product changeovers on a line, acting as a variable end-stop. However, note that the rear adjuster is a travel stop and not a lock; this cylinder will not hold its load without live air. For true load-holding without pressure, consider the SAIL or BSAI series.
To replace this ISO 15552 cylinder, match the 125mm bore, 145mm stroke, 40mm adjustment range, PT tapered port thread, and the appropriate mounting accessory. Because the 145mm stroke is relatively short for this bore, side-load concerns are minimal, but always ensure the M27x2 rod thread is properly secured. No magnet is specified for this configuration, so position sensing via CMSE or DMSE switches is not supported without adding the -S option.
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 SAIJ125X145-40 FAQ
It features a rear adjusting screw that acts as a mechanical stopper, allowing you to trim the effective stroke back by up to 40mm. This creates a usable travel window of 105-145mm, which can be fine-tuned during commissioning without changing the cylinder.
At an operating pressure of 0.5 MPa, it provides 6136N of pull force and 8590N of push force. At the maximum operating pressure of 1.0 MPa, it can deliver up to 1251 kgf of force.
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