Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-20
The AirTAC SAIJ125 Adjustable Cylinder SAIJ125X120-20 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 interchangeable with other ISO 15552 cylinders at the mounting interface.
- BoreØ125 mm
- Stroke120 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-20
The AirTAC SAIJ125X120-20 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. The integrated rear stopper allows you to trim the effective travel down by up to 20mm, creating a precise 100-120mm usable window for end-position tuning.
Unlike fixed-stroke actuators, this model allows you to fine-tune the retract position at commissioning or during product changeovers without swapping the cylinder or adding external stops. It features a PT tapered G1/2 port, dual-sided sensor grooves for mounting CMSE or DMSE switches, and variable air cushions at both ends to decelerate heavy 125mm bore loads. The rear adjuster acts purely as a mechanical stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-20 |
|---|---|
| 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 | 5734 N | 5734 N |
| 0.7 MPa | 8027 N | — |
| Max (@1.0 MPa) | 1169 kgf | |
Double-rod model: the rod passes through the rear cover, so both piston faces lose rod area and push is shown at the annular-area value. Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-20
| 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 SAIJ125X120-20 Is Used
Machine Changeover
Dial in the exact 100-120mm retract position during product size changes without disassembling tooling or installing external mechanical stops.
Assembly Stations
Provides reliable double-acting motion with variable air cushions to decelerate heavy payloads at the end of every stroke.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-20 the Right Cylinder?
The adjustable 100-120mm travel window is ideal for variable product sizes on a line, replacing the need for fixed SAI cylinders when exact end positions fluctuate.
This profile cylinder supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR configurations. It operates at speeds of 30-500mm/s. For applications requiring true load-holding without live air pressure, note that the rear adjuster is a stop, not a lock; you should consider an external rod lock, a pilot-operated check valve, or AirTAC SAIL and BSAI clamp-lock cylinders.
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 SAIJ125X120-20 FAQ
A rear-mounted adjusting screw acts as a mechanical stopper, allowing you to shorten the nominal 120mm stroke by up to 20mm. This creates a 100-120mm adjustable travel window for fine-tuning the end position at commissioning without changing the cylinder.
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Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
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Most inquiries answered within 7-8 hours.
Related AirTAC SAI Cylinders
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