Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-40 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 SAIJ125AX140-40
The AirTAC SAIJ125X140-40 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 100 to 140 mm, allowing you to dial back the 140 mm nominal stroke by up to 40 mm during machine commissioning. This bore size delivers 6136 N of push force at 0.5 MPa, making it suited for heavy positioning tasks. The extruded aluminum barrel includes sensor grooves on both sides, though this specific configuration lacks the -S magnet needed for CMSE or DMSE switches.
This unit features a SUS420J2 stainless steel rod (material code A) for improved corrosion resistance compared to standard carbon steel. The 32 mm rod diameter and M27x2 thread provide a robust interface that handles high side loads well. It uses PT tapered port threads and operates at speeds between 30 and 500 mm/s. The rear adjuster acts purely as a mechanical stop to set the end position; it does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-40 |
|---|---|
| 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 SAIJ125AX140-40
| 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 SAIJ125AX140-40 Is Used
Product Size Changeovers
Dial in the 100-140 mm stroke window on the fly to accommodate varying package lengths on a packaging line without changing out the cylinder.
Heavy Press Positioning
Leverage the 6136 N push force at 0.5 MPa to firmly seat heavy components, using the rear stopper to fine-tune the exact pressing depth.
Machine Setup Tuning
Use the 40 mm adjustment screw during initial commissioning to perfectly set the retract end-position, eliminating the need for custom spacer shims.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-40 the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (offering 3927 N push at 0.5 MPa) lacks sufficient thrust, but a 160 mm bore (10053 N at 0.5 MPa) would be physically oversized. The 40 mm adjustment range is selected when a process requires significant end-position variability, such as accommodating multiple product sizes on a single line without swapping cylinders or adding external mechanical stops. For load-holding without continuous air pressure, this cylinder is insufficient; an external pilot-operated check valve, or an AirTAC SAIL or BSAI model, would be required.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 140 mm nominal stroke, 40 mm adjustment range, PT port threads, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Because the total stroke is 140 mm, side-load risks are moderate, but relying on the 32 mm rod and proper mounting brackets ensures stable linear motion without bowing.
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 SAIJ125AX140-40 FAQ
At 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. If higher pressure is available, it can deliver up to 11045 N of push force at 0.9 MPa.
The rear adjuster screw lets you mechanically shorten the stroke from its 140 mm nominal length down to 100 mm. It functions as a travel stop to set end positions, but it is not a lock and will not hold the load without live air pressure.
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