Airtac SAIJ125 Adjustable Cylinder SAIJ125AX40-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX40-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 40mm 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
- Stroke40 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX40-40S
The AirTAC SAIJ125X40-40-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers 6136N of push force at 0.5 MPa and provides a usable travel window of 0-40mm, allowing you to dial in the exact end position without swapping hardware. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting.
This specific configuration uses a SUS420J2 stainless steel rod (code A) for enhanced corrosion resistance and includes a magnet (-S) for position detection. It operates at speeds of 30-500mm/s and uses a PT G1/2 tapered port. The rear adjuster acts purely as a mechanical stop to fine-tune deceleration and end-position; it does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX40-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX40-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 40 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 SAIJ125AX40-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×40 | 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 SAIJ125AX40-40S Is Used
Product Changeovers
Quickly reconfigure the 0-40mm stroke end-stop on packaging lines to accommodate different carton or product sizes without changing the cylinder.
Short-Stroke Forming
Apply up to 6136N of push force at 0.5 MPa for precise pressing or clamping tasks, using the adjuster to set the exact depth.
Machine Setup
Fine-tune the retracted position during commissioning to perfectly align heavy mechanical stops without adding external spacers.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX40-40S the Right Cylinder?
Choose this 125mm bore when you need substantial thrust, such as stepping up from an 80mm bore that provides 2513N at 0.5 MPa. The adjustable 0-40mm window is perfect for short-stroke applications requiring frequent product-size changeovers, eliminating the need to bolt on external stops or buy multiple fixed-stroke SAI cylinders. For any load-holding requirements without continuous air pressure, this cylinder is insufficient; you should integrate an external pilot-operated check valve or select an AirTAC SAIL or BSAI locking cylinder.
When replacing an ISO 15552 cylinder, verify the 125mm bore, 40mm nominal stroke, 40mm adjustment range, PT G1/2 port, and the required -S magnet. Mounting options for this series are limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR brackets. Position sensing is handled by AirTAC CMSE reed or DMSE electronic switches.
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 SAIJ125AX40-40S FAQ
The rear adjuster allows you to mechanically shorten the effective stroke within a 0-40mm window. It acts as a physical stop to tune the end position at commissioning, but it is not a lock and will not hold the load without live air pressure.
At 0.5 MPa operating pressure, it provides 6136N of push force and 5734N of pull force. The maximum thrust is 1251 kgf at 1.0 MPa.
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