Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-10
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-10 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 400mm 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
- Stroke400 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-10
The AirTAC SAIJ125X400-10 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 390-400 mm usable travel window, allowing you to dial back the 400 mm nominal stroke by up to 10 mm during commissioning. Delivering 6136 N of push force at 0.5 MPa, it is built for heavy-duty positioning tasks.
This bore uses a robust 32 mm carbon steel rod with an M27x2 thread, paired with 40 mm variable air cushions at both ends to manage kinetic energy. The extruded aluminum barrel includes sensor grooves on both sides for adding CMSE or DMSE switches later, and the mounting interface covers Basic, FA, LB, TC, FTC, TCM1, and TCM2 options.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-10 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-10 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 400 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 SAIJ125X400-10
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×400 | 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 SAIJ125X400-10 Is Used
Machine Changeover
Fine-tune the 390-400 mm travel endpoint during product size transitions on automated packaging lines without physically swapping hardware.
Variable End-Stop Positioning
Dial in the exact rejection distance for varying package lengths on a conveyor system using the 10 mm rear adjustment screw.
Heavy-Duty Press Fitting
Leverage the 6136 N of thrust at 0.5 MPa to seat components, using the adjustable stop to set precise compression depth limits.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-10 the Right Cylinder?
Choose this 125 mm bore when 6136 N of push thrust at 0.5 MPa is required, or step down to the 100 mm bore (3927 N) for lighter loads. The adjustable stroke is ideal for product changeovers where the exact end-of-travel position needs micro-tuning without swapping the cylinder or adding external stops. Because the rear adjuster acts only as a travel stop and the air cushions manage deceleration, neither will hold a load without live air pressure; for fail-safe load holding, select a SAIL or BSAI series cylinder instead.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 400 mm stroke, 10 mm adjustment range, PT tapered G1/2 port, and mounting footprint. Since the 400 mm stroke is relatively long for this bore size, an external guide rail is recommended to prevent rod side-loading and premature seal wear.
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 SAIJ125X400-10 FAQ
The rear adjuster screw lets you shorten the 400 mm nominal stroke by up to 10 mm, creating a 390-400 mm travel window. It acts as a mechanical stop to fine-tune the end position and does not lock the load without live air.
At 0.5 MPa, the 125 mm bore provides 6136 N of push force and 5734 N of pull force. The operating speed range is 30-500 mm/s, supported by 40 mm air cushions at both ends.
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Standard models usually ship in 3-4 days.
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