Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-40S 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 SAIJ125AX400-40S
The AirTAC SAIJ125X400-40-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 11045N of push force at 0.9 MPa. It features a SUS420J2 stainless steel rod and a PT tapered port thread. The -40 adjustment code allows you to dial back the 400mm nominal stroke, providing a precise 360-400mm usable travel window for product changeovers without swapping the cylinder.
This adjustable stopper acts solely as a travel end deceleration mechanism, not a lock, meaning it cannot hold a load without live air. For load-holding requirements, consider the SAIL or BSAI variants. The extruded aluminum barrel includes sensor grooves on both sides, and the integrated magnet supports CMSE reed and DMSE solid-state switches for exact position feedback.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-40S |
|---|---|
| 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 SAIJ125AX400-40S
| 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 SAIJ125AX400-40S Is Used
Variable End-Stop Machining
Dial in the 360-400mm travel window during machine setup to accommodate multiple part lengths on a single fixture without adding external stops.
Product Size Changeover
Quickly fine-tune the rear stroke position on packaging lines during format changes, ensuring precise end-of-stroke positioning for varying package dimensions.
Heavy-Duty Clamping
Leverage the 11045N push force for secure clamping of large workpieces, adjusting the travel limit to adapt to different material thicknesses on the fly.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-40S the Right Cylinder?
When sizing this model, compare its 11045N push force at 0.9 MPa against the smaller bore 100 (7068N) or the larger bore 160 (18095N) to match your exact load requirements. Choose this adjustable-stroke version over a fixed SAI when your machine setup requires fine end-position tuning at commissioning or variable end-stops for different product sizes.
Because this is a 400mm stroke, the 32mm rod diameter and M27x2 thread provide robust support, but long unsupported strokes still require an external guide to prevent side-load damage. To replace an ISO 15552 cylinder, match the 125mm bore, 400mm stroke, 40mm adjustment, PT G1/2 port, and -S magnet. SAIJ uses a reduced mounting set: Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR.
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 SAIJ125AX400-40S FAQ
The rear adjusting screw acts as a mechanical stopper that lets you shorten the effective stroke by up to 40mm, creating a 360-400mm usable travel window. It is a travel stop, not a lock, so it cannot hold the load without continuous air pressure.
At an operating pressure of 0.9 MPa, the SAIJ125X400-40-S generates a push force of 11045N and a pull force of 5734N. It operates at a speed range of 30-500 mm/s.
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Standard models usually ship in 3-4 days.
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