Airtac SAIJ125 Adjustable Cylinder SAIJ125AX750-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX750-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 750mm 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
- Stroke750 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX750-40S
The AirTAC SAIJ125X750-40-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 710 to 750 mm usable travel window, allowing you to dial back the end position by up to 40 mm during commissioning without adding external stops. It delivers 6136 N of push force at 0.5 MPa, making it suitable for heavy-duty positioning tasks.
This unit includes a SUS420J2 stainless steel rod and a magnet for CMSE and DMSE sensors. Because the 750 mm stroke is long, the 32 mm rod should be guided externally to prevent side-load damage. The rear adjuster acts only as a travel stop, not a load lock, so maintain live air to hold position.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX750-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX750-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 750 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 SAIJ125AX750-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×750 | 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 SAIJ125AX750-40S Is Used
Heavy Assembly Presses
Fine-tune the 710-750 mm travel end during setup to accommodate varying part heights without swapping out the entire cylinder.
Pallet Positioning Stops
Adjust the rear stopper by up to 40 mm to handle different pallet sizes on the line, ensuring precise end-positioning.
Variable End-Stop Machining
Dial in the exact clamping distance during machine changeover, leveraging the 6136 N of thrust for rigid holding.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX750-40S the Right Cylinder?
Choose this 125 mm bore when you need 6136 N of thrust at 0.5 MPa (8590 N at 0.7 MPa). If your application requires less force, stepping down to the 100 mm bore yields 3927 N at 0.5 MPa. The adjustable stroke is ideal for product changeovers on a line, whereas a fixed SAI cylinder locks you into a single end-stop.
For an exact ISO 15552 replacement, match the 125 mm bore, 750 mm stroke, 40 mm adjustment, PT port thread, and -S magnet. Note that SAIJ uses a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and omits FB, CA, CB, and CR brackets. If you need fail-safe load holding without live air, look to the SAIL or BSAI series instead.
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 SAIJ125AX750-40S FAQ
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.
A rear screw stopper lets you trim the 750 mm nominal stroke back by up to 40 mm, creating a 710 to 750 mm usable travel window for fine-tuning end positions.
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