Airtac SAIJ125 Adjustable Cylinder SAIJ125X700-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X700-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 700mm 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
- Stroke700 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X700-40
The AirTAC SAIJ125X700-40 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a robust 6136N of push force at 0.5 MPa and features a 700mm nominal stroke that can be fine-tuned down by up to 40mm, yielding a usable travel window of 660-700mm. This built-in adjustability allows operators to dial in exact retract end positions during commissioning without adding external stopper blocks.
Featuring a carbon steel piston rod and a PT tapered port thread, this 125mm bore unit relies on a 40mm variable air cushion at both ends to decelerate the load. The rear screw acts purely as a travel stop for position tuning, not as a locking device, so load holding without live air requires a separate SAIL or BSAI cylinder. The extruded aluminum barrel includes dual sensor grooves for adding CMSE or DMSE switches if needed.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X700-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X700-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 700 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 SAIJ125X700-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×700 | 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 SAIJ125X700-40 Is Used
Machine Changeover
Rapidly adjust the 660-700mm retract end-position when switching between product sizes on a packaging line, avoiding mechanical rebuilds.
Precision End-Stop Tuning
Fine-tune the final resting position of heavy actuators during commissioning to achieve exact alignment without swapping the cylinder.
Heavy Material Handling
Move substantial loads using the 6136N push force, relying on the 40mm cushion to safely decelerate the 700mm stroke.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X700-40 the Right Cylinder?
Selecting this 125mm bore cylinder makes sense when your application requires the 6136N push force at 0.5 MPa and a highly variable retract end-point within the 660-700mm range. If your setup only needs the 2805N push force of a 63mm bore, stepping down saves space and air consumption; however, if you need to trim the stroke on the fly during product changeovers rather than machining custom stops, the SAIJ adjustable series is superior to a fixed-stroke SAI model. Because the 700mm stroke is relatively long, an external guide is strongly recommended to prevent excessive side-loading on the rod.
To match this ISO 15552 dimensionally interchangeable cylinder for a replacement, confirm the 125mm bore, 700mm stroke, 40mm adjustment range, PT port thread, and carbon steel rod. The mounting hardware is limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting the FB, CA, CB, and CR styles. Note that this SKU does not include a magnet (-S), so position sensing via CMSE or DMSE switches is not supported out of the box.
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 SAIJ125X700-40 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. It can reach a maximum push force of 11045N at 0.9 MPa.
The rear adjuster screw allows you to shorten the effective stroke by up to 40mm, creating a usable travel window between 660mm and 700mm. This stopper sets the end position but does not lock the load without live air pressure.
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