Airtac SAIJ40 Adjustable Cylinder SAIJ40BX55-50
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX55-50 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 SAIJ40BX55-50
The AirTAC SAIJ40X55-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the nominal 55mm stroke back by up to 50mm, creating a precise 5-55mm usable travel window for exact end-position tuning. Delivering 628N of push force and 528N of pull force at 0.5MPa, it fits perfectly into medium-duty setups requiring on-the-fly position changes. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting.
This SKU features a SUS304 stainless steel rod for superior corrosion resistance and utilizes a PT tapered port thread for a tight, reliable seal. The rear adjuster acts purely as a mechanical stop to set the retract position and relies on the variable air cushions at both ends for end-of-stroke deceleration; it does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX55-50 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX55-50 |
|---|---|
| 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 SAIJ40BX55-50
| 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 SAIJ40BX55-50 Is Used
Machine Setup Tuning
Dial in the exact retract position within the 5-55mm window during initial commissioning without machining external stopper blocks.
Product Changeover
Quickly adjust the end-stop to accommodate varying package sizes or material lengths on a shared conveyor line.
Precision End-Positioning
Use the fine rear screw adjustment to set precise lower-end stops for delicate assembly operations requiring repeatable travel.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX55-50 the Right Cylinder?
Choose this 40mm bore over the smaller 32mm version (which provides 402N push force at 0.5MPa) when your application requires more thrust, or step up to the 50mm bore (982N push force) if your load demands greater power. The adjustable stroke is ideal for machine setups requiring frequent product changeovers, allowing you to fine-tune the end stop during commissioning without swapping the entire cylinder or adding external stops. When matching an ISO 15552 replacement, verify your 55mm stroke, 50mm adjustment range, PT port, and mounting choice (Basic, FA, LB, TC, FTC, TCM1, or TCM2).
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 SAIJ40BX55-50 FAQ
At 0.5MPa operating pressure, this 40mm bore cylinder provides 628N of push force and 528N of pull force. It can deliver up to 1130N of push force at 0.9MPa.
The rear adjuster screw lets you shorten the 55mm nominal stroke by up to 50mm, providing a usable travel window of 5 to 55mm. This allows you to set the exact retract end-position without replacing the cylinder.
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