Airtac SAIJ125 Adjustable Cylinder SAIJ125BX140-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125BX140-20 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
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125BX140-20
The AirTAC SAIJ125X140-20 is a double-acting ISO 15552 profile cylinder equipped with a rear mechanical stroke adjuster. It delivers a 120 to 140 mm usable travel window, allowing you to dial back the 140 mm nominal stroke by up to 20 mm during machine commissioning or product changeover without swapping out the unit.
Featuring a robust 125 mm bore, it generates 8590 N of push force at 0.7 MPa. This SKU utilizes a SUS304 stainless steel rod for superior corrosion resistance, PT tapered ports, and dual-sided sensor grooves. The rear adjuster acts strictly as an end-position stop, not a load-holding lock.
Airtac SAIJ125 Adjustable Cylinder SAIJ125BX140-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125BX140-20 |
|---|---|
| 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 SAIJ125BX140-20
| 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 SAIJ125BX140-20 Is Used
Machine Setup & Changeover
Dial in the exact 120 to 140 mm end-position during product family changeovers without machining new hard stops or replacing the cylinder.
Variable End-Stop Positioning
Fine-tune the retract stroke on heavy assembly presses to accommodate multi-stage tooling heights within the 20 mm adjustment window.
Product Size Transitions
Adjust the effective travel on packaging lines to handle varying carton lengths on the fly, ensuring precise push-off placement.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125BX140-20 the Right Cylinder?
Choose this 125 mm bore when your application requires substantial thrust, such as the 6136 N produced at 0.5 MPa. If your force requirements are lower, stepping down to a 100 mm bore yields 5497 N at 0.7 MPa, while moving up to a 160 mm bore provides 14074 N at the same pressure. The adjustable-stroke design is selected over a fixed-stroke SAI when you need precise end-position tuning at setup without adding external stops.
For dimensionally interchangeable ISO 15552 replacements, match the 125 mm bore, 140 mm stroke, 20 mm adjustment, PT port thread, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Because the nominal stroke is 140 mm, an external guide is not strictly mandated, but the 32 mm rod diameter handles side loads well. Note that a plain SAIJ cannot hold a load without live air; for fail-safe holding, consider the SAIL or BSAI series.
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 SAIJ125BX140-20 FAQ
The rear adjuster screw allows you to mechanically shorten the effective stroke by up to 20 mm. This creates a 120 to 140 mm usable travel window, enabling fine-tuning of the end position at commissioning without adding external stops. The adjuster functions as a travel stop and does not lock the load without live air pressure.
At an operating pressure of 0.7 MPa, the SAIJ125X140-20 generates 8590 N of push force and 5734 N of pull force. The maximum allowable operating pressure is 1.0 MPa, and the cylinder operates at speeds between 30 and 500 mm/s.
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