Airtac SAIJ40 Adjustable Cylinder SAIJ40BX20-10S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX20-10S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 20mm 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
- Stroke20 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX20-10S
The AirTAC SAIJ40X20-10-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, enabling you to dial back the nominal 20 mm stroke by up to 10 mm. This yields a highly precise 10-20 mm usable travel window, perfect for applications requiring exact end-position tuning without adding external stops. It delivers a robust 879 N push force at 0.7 MPa.
This specific configuration features a SUS304 stainless steel piston rod for superior corrosion resistance and includes a magnet for switch sensing. The barrel is an extruded aluminum profile with sensor grooves on both sides, supporting AirTAC CMSE reed and DMSE electronic sensors. It uses PT tapered ports sized G1/4, and the rod thread is M12x1.25.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX20-10S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX20-10S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 20 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 SAIJ40BX20-10S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×20 | 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 SAIJ40BX20-10S Is Used
Changeover Tuning
Dial in the 10-20 mm stroke window during product size changes on a packaging line, ensuring precise end-positioning without physically replacing the cylinder.
Clamp Positioning
Fine-tune the clamping travel on a machining fixture, using the rear stopper to set the exact 10-20 mm travel distance for delicate workholding.
Sensor Calibration
Leverage the dual sensor grooves and integrated magnet to mount CMSE or DMSE switches, easily adjusting the stroke end-point to trigger sensors accurately.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX20-10S the Right Cylinder?
Choose this 40 mm bore cylinder when you need 879 N of push force at 0.7 MPa, which sits neatly between the 50 mm bore (1374 N) and the 32 mm bore (563 N) options. The adjustable stroke is ideal for machine setup and product changeover, allowing you to fine-tune the end stop on the fly instead of swapping to a fixed-stroke SAI cylinder.
When selecting, remember the rear adjuster functions purely as a travel stop, not a lock; it cannot hold a load without live air pressure. For load-holding requirements, consider the SAIL or BSAI series. This SAIJ model uses the reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and is dimensionally interchangeable per ISO 15552.
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 SAIJ40BX20-10S FAQ
It features a rear adjusting screw that acts as a mechanical stopper, allowing you to shorten the 20 mm nominal stroke by up to 10 mm. This creates a 10-20 mm usable travel window that can be fine-tuned during commissioning without swapping the cylinder.
At a 0.7 MPa operating pressure, the SAIJ40X20-10-S provides a push force of 879 N and a pull force of 528 N. It can deliver up to 1130 N push force at 0.9 MPa.
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