Airtac SAIJ125 Adjustable Cylinder SAIJ125AX55-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX55-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 55mm 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
- Stroke55 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX55-40S
The AirTAC SAIJ125X55-40-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force at 0.5 MPa and features a 15-55mm usable travel window, letting you dial in the exact end position without swapping hardware. The SUS420J2 stainless steel rod (code A) provides excellent corrosion resistance, while the integrated magnet (-S) supports CMSE reed and DMSE electronic sensors.
Because the rear screw acts as a mechanical stop rather than a lock, live air pressure is required to hold the load. The extruded aluminum barrel includes sensor grooves on both sides, and mounting options are limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX55-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX55-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 55 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 SAIJ125AX55-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×55 | 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 SAIJ125AX55-40S Is Used
Product Changeovers
Fine-tune the 15-55mm travel window during format size changes on packaging lines without replacing the cylinder.
Variable End Stops
Dial in the exact retraction point for machining or clamping stations that handle parts of varying heights.
Machine Setup
Simplify commissioning by adjusting the rear stopper to perfect the stroke end position during initial machine build.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX55-40S the Right Cylinder?
Choose this 125mm bore when a smaller 100mm unit (providing 3927N push at 0.5 MPa) lacks the necessary thrust, but before stepping up to a 160mm bore (10053N). The 40mm adjustment window is perfect for product-size changeovers on a line, allowing rapid end-stop tuning without adding external stops. For load-holding without continuous air pressure, consider an AirTAC SAIL or BSAI cylinder instead.
To match this ISO 15552 cylinder, confirm the 125mm bore, 55mm nominal stroke, 40mm adjustment range, PT tapered port threads, and the -S magnet. Operating speed is 30-500mm/s, and the M27x2 rod thread handles high side loads, though long unsupported strokes still require an external guide.
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 SAIJ125AX55-40S FAQ
The rear adjuster acts as a mechanical stop, allowing you to trim the 55mm nominal stroke back by up to 40mm. This creates a 15-55mm usable travel window for fine-tuning end positions at commissioning.
At 0.5 MPa, it provides 6136N of push force and 5734N of pull force. It can reach up to 1251 kgf at its maximum 1.0 MPa operating pressure.
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Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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