Airtac SAIJ125 Adjustable Cylinder SAIJ125X65-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X65-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 65mm 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
- Stroke65 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X65-20S
The AirTAC SAIJ125X65-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a robust 6136N push force at 0.5 MPa, making it suitable for heavy-duty operations. The integrated magnet enables position sensing with CMSE reed and DMSE electronic switches. By turning the rear adjusting screw, you can fine-tune the effective travel down from the 65mm nominal stroke, creating a precise 45-65mm usable window without adding external stops.
This model features a 32mm carbon steel piston rod with an M27x2 thread, providing high structural rigidity. It includes adjustable air cushions at both ends to manage kinetic energy. The mounting interface covers Basic, FA, LB, TC, FTC, TCM1, and TCM2 configurations, intentionally omitting FB, CA, CB, and CR brackets to streamline setup.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X65-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X65-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 65 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 SAIJ125X65-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×65 | 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 SAIJ125X65-20S Is Used
Variable End Stops
Dial in the exact clamping distance during machine commissioning, trimming the 65mm stroke back by up to 20mm to accommodate varying part dimensions without hardware swaps.
Product Changeover
Quickly adapt a heavy-duty conveyor diverter or gate mechanism to new package sizes by adjusting the rear stopper, reducing downtime between production runs.
Heavy Assembly Press
Leverage the 6136N push force at 0.5 MPa for pressing components, using the adjustable travel window to set precise engagement depths for delicate sub-assemblies.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X65-20S the Right Cylinder?
Select this 125mm bore when an application requires high thrust combined with variable end-position tuning. If you need less force, stepping down to a 100mm bore yields 3927N at 0.5 MPa, whereas moving up to a 160mm bore provides 10053N. The SAIJ125X65-20-S is chosen over a fixed-stroke SAI cylinder when a machine requires a 45-65mm travel window to accommodate product changeovers. The rear screw acts solely as a mechanical travel stop; it does not hold the load without live air pressure. For fail-safe load holding, use an SAIL pneumatic lock or a BSAI clamp-lock cylinder. To match this ISO 15552 replacement, specify PT tapered ports, a 65mm stroke, 20mm adjustment, and the -S magnet option.
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 SAIJ125X65-20S FAQ
A rear stopper screw allows you to shorten the 65mm nominal stroke by up to 20mm, creating a usable travel window of 45-65mm. This mechanical stop fine-tunes the end position during commissioning but does not lock the load without live air pressure.
At 0.5 MPa, it provides 6136N of push force and 5734N of pull force. If operating at 0.7 MPa, the push force increases to 8590N, and at 0.9 MPa, it reaches 11045N.
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