Airtac SAIJ40 Adjustable Cylinder SAIJ40BX55-30S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX55-30S 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 SAIJ40BX55-30S
The AirTAC SAIJ40X55-30-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a usable travel window of 25 to 55 mm. It delivers 628N of push force and 528N of pull force at 0.5 MPa, fitting medium-duty automation needs. The barrel is extruded aluminum, integrating sensor grooves on both sides for straightforward position detection.
This specific SKU includes a SUS304 stainless steel rod for superior corrosion resistance and a magnet for use with AirTAC CMSE reed and DMSE electronic sensors. It uses a PT tapered port thread and provides variable air cushions at both ends to manage impact deceleration across its 30-800 mm/s speed range.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX55-30S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX55-30S |
|---|---|
| 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 SAIJ40BX55-30S
| 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 SAIJ40BX55-30S Is Used
Machine Changeover
Dial in the exact 25 to 55 mm end-stop during product size changes without physically replacing the cylinder or adding external stopper blocks.
End-Position Tuning
Fine-tune the retract position at commissioning to absorb mechanical tolerances and ensure precise placement of parts.
Washdown Automation
Leverage the SUS304 stainless steel rod for corrosion resistance in food packaging or light washdown assembly lines.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX55-30S the Right Cylinder?
Choose this 40mm bore unit when a 32mm bore (providing 402N push at 0.5 MPa) lacks sufficient thrust, but you want to avoid stepping up to a 63mm cylinder that demands 1559N and more space. The 30mm rear adjuster is ideal for product changeovers, allowing you to dial in the exact end-stop without swapping hardware or adding external stops. Remember the adjuster is a travel stop, not a lock; for load-holding without live air pressure, consider an external rod lock or the SAIL/BSAI series.
To match this ISO 15552 interchangeable cylinder for a retrofit, specify: 40mm bore, 55mm stroke, 30mm adjustment, PT port thread, Basic/FA/LB/TC/FTC/TCM1/TCM2 mountings, and the -S magnet option. Because the stroke is short, side-load risks are minimal, but always ensure the M12x1.25 rod thread is aligned with the load.
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 SAIJ40BX55-30S FAQ
At 0.5 MPa, this 40mm bore cylinder provides 628N of push force and 528N of pull force. If operated at 0.7 MPa, the push force increases to 879N.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the 55mm nominal stroke by up to 30mm, yielding a usable travel window of 25 to 55mm. It only sets the end position and does not lock the load without live air.
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