Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-100S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-100S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 120mm 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
- Stroke120 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-100S
The AirTAC SAIJ125X120-100-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a highly flexible usable travel window of 20 to 120 mm. Delivering 6136 N of push force at 0.5 MPa, this 125 mm bore unit is built for heavy-duty tasks. The PT tapered port threads and carbon steel rod come standard, while the integrated magnet (-S) enables seamless position detection.
Unlike a fixed-stroke SAI cylinder, this model allows you to dial in the exact retract end-position during commissioning without adding external stops. The rear adjuster acts purely as a travel stop and does not hold the load without live air. For load-holding requirements, consider the SAIL or BSAI series. The extruded aluminum barrel features sensor grooves on both sides, compatible with AirTAC CMSE reed and DMSE electronic switches.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-100S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-100S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 120 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 SAIJ125X120-100S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×120 | 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 SAIJ125X120-100S Is Used
Variable End-Stop Positioning
Dial in the retract position from 20 to 120 mm during commissioning to perfectly match sensor targets without machining new hard stops.
Product Size Changeovers
Quickly adapt a production line for different part lengths by adjusting the rear stopper screw, minimizing downtime between product runs.
Heavy-Duty Forming
Leverage the 6136 N push force at 0.5 MPa for pressing or holding applications where the exact end-position needs frequent fine-tuning.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-100S the Right Cylinder?
Choose this 125 mm bore cylinder when an application demands high force alongside extreme stroke variability, as the 100 mm adjustment range on a 120 mm nominal stroke offers unmatched setup flexibility. If the 6136 N push force at 0.5 MPa exceeds your requirements, stepping down to a 100 mm bore yields 3927 N, whereas a 160 mm bore provides 10053 N for heavier loads. Because the nominal stroke is 120 mm, no external guide is strictly required, but the robust 32 mm carbon steel rod helps manage inherent side loads.
This adjustable-stroke design is perfect for machines processing varying product sizes, allowing rapid changeover by simply turning the rear screw. It is dimensionally interchangeable per ISO 15552 and utilizes a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2. To replace an ISO 15552 cylinder, match the 125 mm bore, 120 mm stroke, 100 mm adjustment, PT port thread, and -S magnet specification.
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 SAIJ125X120-100S 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 peak push force of 1251 kgf.
The rear adjuster screw allows you to trim the effective travel down from the 120 mm nominal stroke, creating a usable window of 20 to 120 mm. This stopper sets the end position but does not lock the load without continuous air pressure.
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