Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-40 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 SAIJ125AX400-40
The AirTAC SAIJ125X400-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a substantial 6136N push force at 0.5MPa and a 360-400mm usable travel window, allowing you to dial back the nominal 400mm stroke by up to 40mm. This eliminates the need to swap cylinders or bolt on external stops during machine setup.
This unit is configured with an SUS420J2 stainless steel rod for enhanced durability and uses PT tapered port threads. It includes variable air cushions at both ends to manage kinetic energy. The rear adjuster acts purely as a travel stop for end-position tuning; it does not lock the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-40 |
|---|---|
| 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 SAIJ125AX400-40
| 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 SAIJ125AX400-40 Is Used
Variable End-Stop Setup
Dial in the exact 360-400mm travel window during commissioning to fine-tune end positions without machining custom spacers.
Product Changeover
Quickly adapt a heavy-duty production line for different product sizes by adjusting the rear stopper screw rather than replacing the entire cylinder.
Heavy Clamping Force
Leverage the 6136N push force at 0.5MPa for secure, high-load clamping tasks where the exact final position varies slightly per batch.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-40 the Right Cylinder?
Select this 125mm bore cylinder when an application requires heavy thrust (up to 6136N at 0.5MPa) alongside precise end-position tuning. If you need less force, stepping down to an 80mm bore yields 2513N. The adjustable-stroke design is ideal for product-size changeovers on a line, whereas a fixed-stroke SAI cylinder requires mechanical spacers for variations.
Because the 400mm stroke is substantial, an external guide is recommended to prevent excessive side-loading on the 32mm rod. For position holding without continuous air pressure, choose a SAIL locking cylinder or a BSAI clamp-lock variant, as the SAIJ adjuster is only a stop. This ISO 15552 profile cylinder supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts.
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 SAIJ125AX400-40 FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder provides a push force of 6136N and a pull force of 5734N. It can reach a maximum push force of 11045N at 0.9MPa.
The rear adjuster screw lets you shorten the 400mm nominal stroke by up to 40mm, creating a 360-400mm usable travel window. This stopper only sets the end position and does not hold the load without live air pressure.
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