Airtac SAIJ125 Adjustable Cylinder SAIJ125X800-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X800-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 800mm 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
- Stroke800 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X800-40S
The AirTAC SAIJ125X800-40-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. It features a carbon steel piston rod and a built-in magnet (-S) for position sensing. With an 800 mm nominal stroke and a 40 mm adjustment range, you can fine-tune the effective travel anywhere between 760 and 800 mm without adding external stops.
This adjustable window is ideal for product changeovers on long-stroke lines. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE reed or DMSE electronic switches. While the rear screw sets the travel end and the variable air cushions decelerate the load, neither acts as a lock; use a SAIL or BSAI cylinder if you need to hold position without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X800-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X800-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 800 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 SAIJ125X800-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×800 | 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 SAIJ125X800-40S Is Used
Long-Stroke Press Feeding
Dial in the exact 760 to 800 mm material push distance during setup to accommodate different blank widths without changing tooling.
Pallet Positioning Stops
Adjust the retract end-stop by up to 40 mm on the fly to handle varying pallet depths on a heavy-duty transfer line.
Heavy Assembly Line Changeover
Quickly retune the 800 mm travel endpoint for new product variants, leveraging 6136N of thrust to move bulky components.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X800-40S the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (providing 3927N push at 0.5 MPa) lacks the thrust for heavy actuation, but a 160 mm bore is physically oversized. The 40 mm adjustment screw allows precise end-position tuning at commissioning, which is far more efficient than machining custom spacers or swapping a fixed-stroke SAI cylinder. To match this ISO 15552 replacement exactly, specify the PT tapered port thread, the -S magnet option, and a mounting bracket from the SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, or TCM2.
Because the 800 mm stroke is substantial, the 32 mm rod and M27x2 thread will still experience deflection under high side loads. Always guide the load externally to prevent rod binding. The operating speed is 30-500 mm/s, suitable for controlled heavy movements.
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 SAIJ125X800-40S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the effective stroke by up to 40 mm. This creates a usable travel window of 760 to 800 mm, enabling fine-tuning of the end position without replacing the cylinder.
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