Airtac SAIJ40 Adjustable Cylinder SAIJ40BX55-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX55-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 55mm 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
- Stroke55 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX55-20
The AirTAC SAIJ40X55-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 55 mm stroke by up to 20 mm for a usable travel window of 35-55 mm. It delivers 879 N of push force at 0.7 MPa and features a 16 mm SUS304 stainless steel rod with an M12x1.25 thread. The PT tapered port threads provide a tight, reliable pneumatic connection.
This configuration uses a stainless steel rod for enhanced corrosion resistance, making it suitable for environments where carbon steel might degrade. The extruded aluminum barrel includes sensor grooves on both sides for mounting CMSE or DMSE switches. Remember that the rear adjuster acts as a mechanical stop to set the end position, not a lock; the cylinder cannot hold a load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX55-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX55-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 55 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 SAIJ40BX55-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×55 | 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 SAIJ40BX55-20 Is Used
End-Position Tuning
Dial in the exact retract distance between 35 and 55 mm during commissioning without installing external physical stops.
Machine Changeover
Quickly adapt the cylinder's travel window when switching product sizes on a packaging or assembly line.
Corrosion-Resistant Actuation
Leverage the SUS304 stainless steel rod for reliable performance in environments requiring higher corrosion resistance.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX55-20 the Right Cylinder?
Choose this 40 mm bore if your application requires 879 N of push force at 0.7 MPa, or step down to a 32 mm bore providing 563 N if your load is lighter. The adjustable 35-55 mm travel window is ideal for machine setup and product changeover, letting you fine-tune the retract end position without swapping the cylinder or adding external stops. For load-holding without continuous air pressure, consider the SAIL or BSAI series instead of relying on the adjuster.
To match this ISO 15552 cylinder for a replacement, confirm the 40 mm bore, 55 mm stroke, 20 mm adjustment range, PT port threads, and the SUS304 rod material. Since the stroke is under 300 mm, side-load concerns are minimal, but the 16 mm rod still handles moderate bending stress well.
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 SAIJ40BX55-20 FAQ
It features a rear adjusting screw that lets you mechanically shorten the effective stroke by up to 20 mm. This creates a usable travel window of 35-55 mm, allowing you to fine-tune the retract end position during setup without replacing the cylinder.
At 0.7 MPa, this 40 mm bore cylinder provides 879 N of push force. The rear adjuster is a travel stop, not a locking mechanism; it cannot hold a load without continuous air pressure. For true load-holding, use a SAIL or BSAI series cylinder.
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