Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-40S 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 SAIJ125AX140-40S
The AirTAC SAIJ125X140-40-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force at 0.5MPa and features a 100-140mm usable travel window, letting you dial back the 140mm nominal stroke by up to 40mm. The SUS420J2 stainless steel rod provides corrosion resistance, while the PT G1/2 port handles high flow.
This model includes a magnet for CMSE reed and DMSE electronic sensors, fitting into the extruded aluminum barrel grooves. The rear adjustment screw acts as a mechanical stop to fine-tune end positions at commissioning, but it does not hold the load without live air. For load-holding, use a SAIL or BSAI cylinder.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-40S |
|---|---|
| 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 SAIJ125AX140-40S
| 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 SAIJ125AX140-40S Is Used
Variable End-Stop Machining
Dial in the 100-140mm travel window during machine setup to accommodate different part lengths without replacing the entire cylinder.
Product Changeover Lines
Quickly adjust the retract position by up to 40mm during packaging format changes, ensuring precise positioning for varying product sizes.
Heavy Assembly Stations
Leverage the 6136N push force at 0.5MPa for pressing operations, using the rear screw to fine-tune the final assembly depth accurately.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-40S the Right Cylinder?
Choose this 125mm bore when 80mm (2513N push at 0.5MPa) is too weak, but a 160mm bore is excessive. The 40mm adjustment range is ideal for product changeovers, allowing variable end-stops without swapping cylinders. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
To match this ISO 15552 cylinder, confirm the 125mm bore, 140mm stroke, 40mm adjust, PT G1/2 port, and the -S magnet. The 32mm rod and M27x2 thread handle high side loads, but for the 140mm stroke, ensure external guides support heavy loads. The rear stopper decelerates travel but is not a lock.
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 SAIJ125AX140-40S FAQ
At 0.5MPa, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.9MPa, the push force increases to 11045N.
The nominal stroke is 140mm, but the rear adjuster allows you to shorten the effective travel by up to 40mm, creating a 100-140mm usable window. This mechanical stop fine-tunes the end position but does not lock the load without live air.
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