Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 140mm 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
- Stroke140 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-30S
The AirTAC SAIJ125X140-30-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N push and 5734N pull thrust at 0.5 MPa. It features a carbon steel rod and a PT tapered G1/2 port. The integrated -S magnet enables position sensing with AirTAC CMSE reed or DMSE electronic solid-state switches.
This model uses a 140 mm nominal stroke with a 30 mm rear adjustment screw, creating a usable travel window of 110-140 mm. This lets you fine-tune the retract end-position at commissioning without adding external stops. The extruded aluminum barrel includes sensor grooves on both sides, and the SAIJ mounting set omits FB, CA, CB, and CR brackets, utilizing Basic, FA, LB, TC, FTC, TCM1, and TCM2 interfaces.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 140 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 SAIJ125X140-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×140 | 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 SAIJ125X140-30S Is Used
Variable End-Stop Tuning
Dial the retract position back by up to 30 mm during machine setup to perfectly align stops for new product dimensions without swapping cylinders.
Heavy Product Changeover
Leverage 6136N of push force at 0.5 MPa to move heavy pallets, adjusting the 110-140 mm travel window on the fly as package sizes vary.
Commissioning Fine-Tune
Trim the effective stroke from 140 mm down to 110 mm to absorb mechanical tolerances and achieve precise end-of-stroke positioning at initial setup.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-30S the Right Cylinder?
Choose this 125 mm bore when 80 mm (2513N push at 0.5 MPa) lacks the force for heavy product changeovers, but stepping up to 160 mm (10053N) is unnecessary. The 30 mm adjustment window is ideal for dialing in exact retract stops on varying product sizes. For strokes of 140 mm, side-load is minimal, but long unsupported travel still needs an external guide. To replace an ISO 15552 cylinder, match the 125 mm bore, 140 mm stroke, PT G1/2 port, and -S magnet. Note that the rear adjuster is a travel stop, not a lock; for load-holding without live air, use an AirTAC SAIL or BSAI cylinder.
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 SAIJ125X140-30S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster screw allows you to shorten the 140 mm nominal stroke by up to 30 mm, providing a usable travel window of 110-140 mm. It acts as a mechanical stop to decelerate the load, but it does not hold the load without live air pressure.
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