Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-20 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 SAIJ125AX375-20
The AirTAC SAIJ125X375-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel to a 355-375 mm window. It delivers 6136 N of pull force at 0.5 MPa, making it well-suited for heavy-duty positioning tasks. The extruded aluminum barrel includes sensor grooves on both sides, and this specific configuration uses a SUS420J2 stainless steel rod (code A) for enhanced corrosion resistance.
Instead of relying on external stops, the integrated 20 mm adjustment screw lets you dial in the exact retract end-position during commissioning or product changeovers. Operating at speeds of 30-500 mm/s, this cylinder utilizes PT tapered port threads (G1/2) and supports a mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-20 |
|---|---|
| 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 SAIJ125AX375-20
| 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 SAIJ125AX375-20 Is Used
Machine Changeover
Dial in the 355-375 mm retract position precisely when switching a production line to a new product size, avoiding the need to physically swap cylinders.
Heavy-Duty Positioning
Leverage the 6136 N pull force at 0.5 MPa to move heavy jigs or fixtures into their final working position with a fine-tuned end stop.
Commissioning Calibration
Use the 20 mm rear adjuster screw during initial machine setup to perfectly synchronize multiple actuators without adding external stopper blocks.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-20 the Right Cylinder?
Select this 125 mm bore when your application requires substantial force—stepping down to an 80 mm bore drops your pull force to 2268 N at 0.5 MPa, whereas this model provides 6136 N. Choose the SAIJ adjustable-stroke variant over a fixed SAI cylinder when you need precise end-position tuning without swapping out physical components. For load-holding without continuous air pressure, note that the rear adjuster acts only as a travel stop; you would need an SAIL or BSAI lock cylinder instead.
Because the 375 mm stroke is relatively long, the 32 mm rod diameter should be paired with an external guide to prevent excessive side-loading on the piston. This SKU is dimensionally interchangeable per ISO 15552 and is configured with PT ports, no sensor magnet, and a SUS420J2 stainless steel rod.
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 SAIJ125AX375-20 FAQ
It features a rear stopper screw that allows you to shorten the nominal 375 mm stroke by up to 20 mm, providing an effective travel window of 355-375 mm. This allows you to fine-tune the end position at commissioning without adding external stops.
At an operating pressure of 0.5 MPa, the SAIJ125X375-20 provides 6136 N of pull force and 8590 N of push force. It can deliver up to 11045 N of push force at 0.7 MPa.
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