Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-10
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-10 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 SAIJ125AX400-10
The AirTAC SAIJ125X400-10 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the effective travel within a 390-400 mm window. Delivering 6136 N of push force at 0.5 MPa, it handles heavy loads while allowing precise end-position tuning during commissioning. The extruded aluminum barrel includes sensor grooves on both sides, and this specific configuration uses a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance.
The integrated rear stopper lets you dial in the exact retract position on product changeovers without swapping the cylinder or adding external stops. It operates at speeds of 30-500 mm/s and features PT tapered port threads. Remember that the adjuster acts only as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-10 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-10 |
|---|---|
| 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 SAIJ125AX400-10
| 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 SAIJ125AX400-10 Is Used
Heavy Press Tuning
Fine-tune the 390-400 mm retract position on heavy pressing tools to compensate for material thickness variations without machining new stopper blocks.
Pallet Changeover
Adjust the end-of-stroke position slightly during product size changeovers to accommodate different pallet widths on a high-thrust transfer line.
Fixture Alignment
Dial in the exact clamping endpoint during machine setup, utilizing the 6136 N thrust to secure heavy cast components while avoiding hard mechanical crashes.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-10 the Right Cylinder?
Choose this 125 mm bore when an 80 mm bore (providing 2513 N push at 0.5 MPa) lacks the thrust for your heavy fixtures, but a 160 mm bore is physically too large. The 10 mm adjustment range is ideal for applications needing slight end-position corrections rather than massive travel changes. Because this is a 400 mm stroke, the 32 mm rod diameter needs external guiding to prevent excessive side-loading and premature seal wear.
For an exact ISO 15552 replacement, match the 125 mm bore, 400 mm stroke, PT port thread, and mounting choice (Basic, FA, LB, TC, FTC, TCM1, or TCM2). If your process requires the cylinder to hold its position without continuous air pressure, select a SAIL pneumatic lock or BSAI clamp-lock cylinder instead, as the SAIJ adjuster is not a braking device.
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 SAIJ125AX400-10 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf of thrust.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the nominal 400 mm stroke by up to 10 mm, creating a 390-400 mm usable travel window. It only sets the end position and does not lock the load without live air pressure.
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