Airtac SAIJ125 Adjustable Cylinder SAIJ125AX750-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX750-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 750mm 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
- Stroke750 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX750-50S
The AirTAC SAIJ125X750-50-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 700 to 750 mm. Delivering 6136 N of push force at 0.5 MPa, it is built for heavy-duty positioning. The barrel features sensor grooves on both sides, and this -S variant includes a magnet for direct compatibility with AirTAC CMSE reed and DMSE electronic solid-state switches.
This model utilizes a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance and features PT tapered port threads. The rear adjuster acts purely as a mechanical stop to decelerate the travel end, meaning it does not hold the load without live air pressure. For load-holding requirements without continuous air, an external rod lock or the related SAIL pneumatic-lock cylinder is required.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX750-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX750-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 750 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 SAIJ125AX750-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×750 | 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 SAIJ125AX750-50S Is Used
Variable End-Stop Tuning
Dial in the exact retract position within a 700-750 mm window during commissioning without machining new hard stops or changing the cylinder.
Product Size Changeover
Quickly adjust the stroke length by up to 50 mm to accommodate different product sizes running on the same heavy-duty production line.
Heavy-Duty Positioning
Leverage 6136 N of thrust at 0.5 MPa to move substantial masses while relying on the rear screw for precise final placement.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX750-50S the Right Cylinder?
Choose this 125 mm bore when a 100 mm cylinder (providing 3927 N push at 0.5 MPa) lacks the necessary thrust, but stepping up to a 160 mm bore (10053 N) would be excessive. The 50 mm adjustment range is ideal for fine-tuning the end position during machine setup or product changeovers, eliminating the need to physically swap cylinders or add external stopper blocks. When replacing an ISO 15552 cylinder, match the 750 mm stroke, 50 mm adjuster, PT port threads, and the -S magnet requirement.
Because this cylinder features a 750 mm stroke, the 32 mm diameter rod and M27x2 rod thread will experience significant leverage under side loading. An external guide rail must be used to support the load and prevent premature seal wear. The available mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR options.
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 SAIJ125AX750-50S 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 delivers a maximum push force of 1251 kgf.
The rear adjuster screw allows you to shorten the effective stroke by up to 50 mm, creating a usable travel window of 700 to 750 mm from the nominal 750 mm stroke. It functions as a mechanical stop to set the end position and does not lock the load without live air pressure.
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