Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-50S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 50mm 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
- Stroke50 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-50S
The AirTAC SAIJ40X50-50-S is a double-acting, adjustable-stroke ISO 15552 profile cylinder featuring a 40mm bore and a 50mm nominal stroke. Equipped with a rear stopper screw, it allows you to dial back the travel by up to 50mm, creating a highly versatile 0-50mm usable window for exact end-position tuning during commissioning. This model delivers 628N of push force at 0.5 MPa and includes a SUS304 stainless steel rod for superior corrosion resistance.
Unlike fixed-stroke actuators, this rear adjuster lets you refine the retract position on the fly without adding external stops. The extruded aluminum barrel provides sensor grooves on both sides for CMSE reed and DMSE electronic switches. It uses a PT tapered port thread and omits the FB, CA, CB, and CR mounting options, utilizing a precise subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-50S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 50 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 SAIJ40BX50-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×50 | 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 SAIJ40BX50-50S Is Used
Product Changeovers
Dial in the exact retract distance from 0 to 50mm on packaging lines handling varying container sizes without swapping the cylinder.
Machine Setup
Fine-tune the end-of-stroke position during initial commissioning to perfect timing and avoid mechanical interference.
Variable End Stops
Use the rear stopper screw to establish precise, repeatable retracted positions for delicate assembly operations.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-50S the Right Cylinder?
Selecting the SAIJ40X50-50-S is ideal when a machine requires frequent product changeovers, as the 50mm adjustment range on a 50mm stroke allows the end-stop to be set anywhere from 0 to 50mm. If your application requires less force, stepping down to a 32mm bore yields 402N at 0.5MPa, while moving up to a 50mm bore provides 982N. Remember that the rear adjuster acts only as a travel stop and does not hold the load without live air; for true fail-safe load holding, consider the SAIL or BSAI series. To match this ISO 15552 footprint, ensure your setup specifies a 40mm bore, 50mm stroke, 50mm adjustment, PT ports, and the -S magnet option.
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 SAIJ40BX50-50S FAQ
The rear adjuster is a stopper screw that mechanically limits the piston's retract travel. On this 50mm nominal stroke model, you can trim the effective travel back by up to 50mm, providing a usable stroke window of 0 to 50mm.
At a 0.5 MPa operating pressure, the SAIJ40X50-50-S provides 628N of push force and 528N of pull force. At the maximum 1.0 MPa pressure, it delivers up to 1130N of push force.
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