Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 900mm 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
- Stroke900 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-75S
The AirTAC SAIJ125X900-75-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 825 to 900 mm. Delivering 6136 N of push force at 0.5 MPa, it handles heavy-duty positioning with precision. The extruded aluminum barrel includes sensor grooves on both sides, and this -S variant includes a magnet for CMSE reed and DMSE electronic switches.
This model features a SUS420J2 stainless steel rod (code A) for enhanced corrosion resistance and uses PT tapered port threads. The rear adjuster acts strictly as a travel stop to fine-tune the retract position during commissioning; it does not lock the load without live air pressure. For load-holding requirements, an external pilot-operated check valve or a SAIL locking cylinder is required.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 900 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 SAIJ125AX900-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×900 | 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 SAIJ125AX900-75S Is Used
Product Changeover
Dial in the 825-900 mm retract end-stop during format size changes without bolting on external physical stops or replacing the actuator.
Heavy Press Positioning
Leverage 6136 N of thrust at 0.5 MPa to move heavy tooling heads, using the fine adjustment to perfect the final resting position.
Long-Stroke Assembly Lines
Utilize the 900 mm travel for pushing large components down an assembly line, tuning the exact end-of-stroke location during machine commissioning.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-75S the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (providing 3927 N push at 0.5 MPa) lacks the necessary thrust, but a 160 mm bore (10053 N) is physically oversized. The 75 mm adjustment range is ideal for product-size changeovers on a line, allowing you to dial back the 900 mm stroke without swapping the cylinder or adding external stops. When replacing an ISO 15552 cylinder, match the 125 mm bore, 900 mm stroke, PT port threads, and -S magnet.
Because the stroke is 900 mm, the 32 mm diameter rod and M27x2 thread still require external guidance to prevent excessive side-loading on the front cap. Operating speed for this bore is 30-500 mm/s. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR brackets.
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 SAIJ125AX900-75S FAQ
The rear adjuster screw lets you shorten the effective stroke by up to 75 mm, creating an 825 to 900 mm travel window. It acts as a mechanical stop to fine-tune the retract position and is not a lock.
At 0.5 MPa it provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
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