Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-75 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 SAIJ125X140-75
The AirTAC SAIJ125X140-75 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel down to a 65-140 mm window from its 140 mm nominal stroke. Delivering 6136 N of push force at 0.5 MPa, it is built for heavy-duty positioning. The extruded aluminum barrel incorporates sensor grooves on both sides, allowing you to easily mount position switches if needed.
This model utilizes a carbon steel piston rod with an M27x2 thread, paired with a G1/2 PT tapered port. The rear adjustment screw acts purely as a mechanical stop to trim the retract end-position during commissioning or product changeovers. It is not a locking device; the cylinder relies on live air pressure to maintain its load, so an external rod lock or pilot-operated check valve is required for fail-safe holding.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-75 |
|---|---|
| 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 SAIJ125X140-75
| 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 SAIJ125X140-75 Is Used
Variable End-Stop Positioning
Dial in the exact retract distance between 65 and 140 mm during machine commissioning to perfectly align heavy workpieces without adding external spacers.
Multi-Product Line Changeover
Rapidly switch the stroke end-position on a packaging or assembly line to accommodate different carton or product sizes using the rear adjustment screw.
Heavy-Duty Forming End-Stop
Leverage the 6136 N push force and precise stopper to set rigid, repeatable bottoming positions for pressing or forming stations.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-75 the Right Cylinder?
Choose this 125 mm bore when an 80 mm cylinder (providing 2513 N push at 0.5 MPa) is insufficient for moving heavy jigs, and a 160 mm bore is physically oversized. The 75 mm adjustment range is exceptionally wide, making this specific SKU ideal for machines processing multiple product sizes on a single line, where you need variable end-stops without swapping out the physical cylinder. It provides a simpler setup than machining custom external spacers.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 140 mm stroke, 75 mm adjustment, G1/2 port, and mounting style. SAIJ supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR brackets. Although the stroke is under 300 mm, the substantial 6136 N output means you should still verify rod side-loading capacities and guide heavy loads externally to prevent premature seal wear.
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 SAIJ125X140-75 FAQ
The rear of the cylinder features an external adjusting screw that mechanically stops the piston. For this model, you can trim the effective stroke back by up to 75 mm, creating a usable travel window of 65 to 140 mm. The adjuster only sets the end position; it does not lock or hold the load without live air pressure.
At 0.5 MPa operating pressure, it provides 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa, the push force reaches 1251 kgf. The operational speed range for this 125 mm bore is 30-500 mm/s.
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