Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 500mm 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
- Stroke500 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-75S
The AirTAC SAIJ125X500-75-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, enabling a usable travel window of 425 to 500 mm. Delivering 6136 N of push force and 5734 N of pull force at 0.5 MPa, it is built for heavy-duty positioning. The extruded aluminum barrel features sensor grooves on both sides, and this unit includes a magnet for CMSE reed and DMSE electronic switches.
The integrated rear stopper allows precise end-position tuning during commissioning or product changeovers without adding external stops. Operating at 30-500 mm/s, this model uses a PT tapered G1/2 port and a 32 mm carbon steel rod. The rear adjuster acts strictly as a travel stop to set deceleration, not a lock, so live air is required to hold the load.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 500 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 SAIJ125X500-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×500 | 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 SAIJ125X500-75S Is Used
Variable End-Stop Setup
Dial in the exact 425 to 500 mm travel distance during machine commissioning without physically swapping out the entire cylinder body.
Product Size Changeover
Quickly adapt the rear stopper on packaging lines when switching to different carton lengths, ensuring precise positioning on the fly.
Heavy-Duty Positioning
Leverage the 6136 N push force at 0.5 MPa to move heavy jigs into place while fine-tuning the final deceleration point.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-75S the Right Cylinder?
Choose this 125 mm bore when the 80 mm bore's 2513 N push force at 0.5 MPa is insufficient for your tooling, or step down if the 100 mm bore provides adequate force. The adjustable stroke is ideal for variable end-stops and machine setup, whereas a fixed SAI cylinder lacks this flexibility. For load-holding without continuous air pressure, select a SAIL or BSAI cylinder instead of relying on the adjuster.
When replacing an ISO 15552 cylinder, match the 500 mm stroke, 75 mm adjustment range, G1/2 PT port, and the -S magnet. Because the stroke is 500 mm, the 32 mm rod needs an external guide to prevent side-load damage on the seals. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125X500-75S FAQ
At 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum operating pressure of 1.0 MPa, it delivers up to 1251 kgf.
The rear adjusting screw lets you shorten the nominal 500 mm stroke by up to 75 mm, creating a usable travel window of 425 to 500 mm. The adjuster sets the travel end and deceleration, but it does not lock the load without live air pressure.
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