Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-10S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-10S 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 SAIJ125X40-10S
The AirTAC SAIJ125X40-10-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a nominal 40mm stroke that can be dialed back by up to 10mm, giving operators a precise 30-40mm usable travel window for product changeovers without swapping the cylinder. In the 125mm bore class, it delivers 6136N of push force at 0.5 MPa and 8590N at 0.7 MPa.
This unit includes a magnet for position sensing with AirTAC CMSE reed and DMSE electronic switches. The extruded aluminum barrel features sensor grooves on both sides, and the carbon steel rod uses an M27x2 thread. It supports a speed range of 30-500mm/s and uses PT tapered port threading. The rear adjuster acts purely as a travel stop for end-position tuning, not a load lock.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-10S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-10S |
|---|---|
| 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 SAIJ125X40-10S
| 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 SAIJ125X40-10S Is Used
Variable End-Stop Tuning
Dial in the exact 30-40mm travel window during machine setup to accommodate slight variations in incoming product dimensions without changing the cylinder.
Product Changeover
Quickly adjust the retract position on packaging lines when switching between different package sizes, reducing downtime and eliminating external stop hardware.
Robust Actuation
Leverage the 6136N push force at 0.5 MPa and heavy-duty M27x2 rod thread for pressing, lifting, or holding heavy assemblies securely in place.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-10S the Right Cylinder?
Choose this adjustable model over a fixed-stroke SAI when you need to fine-tune the retract end-position at commissioning or accommodate slight product size variations on a line. If your application requires less force, stepping down to the 100mm bore yields 3927N at 0.5 MPa. For load-holding without live air pressure, this cylinder is insufficient since the rear adjuster is only a stop; consider an AirTAC SAIL pneumatic lock or BSAI clamp-lock cylinder instead.
To replace this ISO 15552 cylinder, match the 125mm bore, 40mm nominal stroke, 10mm adjustment range, PT G1/2 port, and the -S magnet option. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR styles. Because the 32mm rod and M27x2 thread carry high side-load capacity, this profile cylinder handles robust actuation, though long unsupported strokes still need an external guide.
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 SAIJ125X40-10S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster screw acts as a mechanical stop that allows you to shorten the 40mm nominal stroke by up to 10mm. This creates a 30-40mm usable travel window for fine-tuning the end position without replacing the cylinder.
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