Airtac SAIJ125 Adjustable Cylinder SAIJ125X20-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X20-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 20mm 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
- Stroke20 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X20-20S
The AirTAC SAIJ125X20-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force at 0.5 MPa and features a carbon steel rod with PT tapered port threads. Because the nominal 20 mm stroke can be dialed back by up to 20 mm, this SKU provides a 0-20 mm usable travel window for exact end-position tuning at commissioning.
The rear adjuster acts purely as a mechanical stop to set the retract end position, meaning it will not hold the load without live air pressure. For load-holding applications without continuous pressure, consider the SAIL or BSAI series. This -S variant includes a magnet for position sensing and works seamlessly with AirTAC CMSE reed and DMSE electronic switches mounted in the dual-side sensor grooves.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X20-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X20-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 20 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 SAIJ125X20-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×20 | 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 SAIJ125X20-20S Is Used
Precision Changeovers
Dial in the 0-20 mm travel window during product size transitions without swapping out the entire cylinder or adding external stops.
High-Force End Stops
Leverage the 6136N thrust capacity at 0.5 MPa for heavy pressing or clamping tasks that require exact, adjustable end-position control.
Machine Setup Calibration
Fine-tune the retract end position during initial machine commissioning using the rear screw, ensuring perfect alignment before production runs.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X20-20S the Right Cylinder?
Choose this 125 mm bore cylinder when you need to trim the travel window down to zero for high-force product changeovers, rather than using a fixed-stroke SAI cylinder. If your application requires less force, stepping down to an 80 mm bore yields 2513N at 0.5 MPa. To replace an ISO 15552 cylinder, match the 125 mm bore, 20 mm stroke, 20 mm adjustment, PT port, and the -S magnet requirement. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR.
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 SAIJ125X20-20S FAQ
At 0.5 MPa operating pressure, this 125 mm 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 20 mm. With a 20 mm nominal stroke, this creates a 0-20 mm usable travel window for precise end-position tuning without changing the cylinder.
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