Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 125mm stroke, G1/4 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ40 mm
- Stroke125 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-20S
The AirTAC SAIJ40X125-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a 105-125mm usable travel window, allowing you to dial back the 125mm nominal stroke by up to 20mm during commissioning. Delivering 879N of push force at 0.7MPa, it handles mid-range actuation tasks with ease.
This variant features a SUS304 stainless steel rod for superior corrosion resistance and includes a magnet for CMSE or DMSE sensors. The extruded aluminum barrel includes sensor grooves on both sides, and the PT tapered port ensures a reliable pneumatic connection.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 125 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 30 mm |
| Max stroke | Up to 1200 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×125 | 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 SAIJ40 Adjustable Cylinder SAIJ40BX125-20S Is Used
Machine Setup Changeover
Fine-tune the 105-125mm travel window during product size changes on a packaging line without physically swapping the cylinder.
Variable End-Stop Positioning
Dial in the exact retract position for machining or clamping operations where a fixed 125mm stroke would overshoot the target.
Adjustable Diverting Arm
Adjust the stroke length on a conveyor sorting arm to accommodate different package widths on the fly.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-20S the Right Cylinder?
Select this 40mm bore cylinder when you need 879N of push force at 0.7MPa, stepping up from a 32mm bore (563N) for heavier payloads, or down from a 50mm bore (1374N) to save space. The adjustable stroke is ideal for product changeovers, letting you fine-tune the end position without adding external stops or swapping a fixed-stroke SAI cylinder. The rear adjuster acts only as a travel stop and does not hold the load without live air; for load-holding without pressure, consider an external rod lock or the SAIL series.
When replacing an ISO 15552 cylinder, match the 40mm bore, 125mm stroke, 20mm adjustment, PT port, and the -S magnet requirement. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2. Because the stroke is under 300mm, side-load stress is minimal, but ensure the 16mm rod and M12x1.25 thread are aligned 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 SAIJ40 Adjustable Cylinder SAIJ40BX125-20S FAQ
At 0.7MPa operating pressure, this 40mm bore cylinder provides 879N of push force and 528N of pull force. At 0.5MPa, it delivers 628N push and 528N pull.
The rear adjuster screw allows you to shorten the 125mm nominal stroke by up to 20mm, creating a 105-125mm usable travel window. The adjuster acts as a mechanical stop for end-position tuning and does not function as a lock.
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