Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-20 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 SAIJ125AX400-20
The AirTAC SAIJ125X400-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to fine-tune the end position by up to 20 mm. This creates a usable travel window of 380-400 mm, providing exact end-position tuning at commissioning without the need to swap the cylinder or bolt on external stops. It delivers a robust 6136 N pull force at 0.5 MPa, making it suitable for heavy-duty positioning tasks.
This variant features a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance and utilizes PT tapered port threads with a G1/2 connection. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting. Operating at speeds of 30-500 mm/s, it relies on adjustable air cushions at both ends to decelerate the load smoothly.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-20 |
|---|---|
| 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 SAIJ125AX400-20
| 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 SAIJ125AX400-20 Is Used
Product Size Changeovers
Dial in the 380-400 mm travel window during production line changeovers to accommodate different package lengths without changing the cylinder.
Heavy-Duty Positioning
Leverage the 6136 N pull force to move heavy pallets or fixtures into exact alignment, using the rear screw for final millimeter adjustments.
Machine Setup Tuning
Fine-tune the retract end-position during initial commissioning to prevent mechanical crashes, avoiding the need to machine external stopper blocks.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-20 the Right Cylinder?
Select this 125 mm bore cylinder when a machine requires substantial thrust—such as the 6136 N pull at 0.5 MPa—combined with variable end-stops for product size changeovers. If your application needs less force, stepping down to an 80 mm bore provides 2268 N of pull force, whereas moving up to a 160 mm bore yields 9425 N. The adjustable stroke is chosen over a fixed SAI cylinder when you need on-the-fly end-position tuning during setup or line changeovers.
Because this model features a 400 mm stroke, the 32 mm rod diameter should be paired with an external guide to prevent excessive side-loading on the piston. The rear adjuster acts strictly as a travel stop and does not hold the load without live air; for load-holding without pneumatic pressure, consider an AirTAC SAIL or BSAI cylinder. As a dimensionally interchangeable ISO 15552 profile cylinder, it uses a reduced mounting set of 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 SAIJ125AX400-20 FAQ
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder provides 6136 N of pull force and 8590 N of push force. At 0.9 MPa, the push force increases to 11045 N.
The rear adjuster screw allows you to shorten the effective travel from the nominal 400 mm down to 380 mm. This creates a 20 mm tuning window to set the exact retract end-position without replacing the cylinder.
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