Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-50
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 240mm 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
- Stroke240 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-50
The AirTAC SAIJ40X240-50 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster that allows you to trim the effective travel back by up to 50 mm. This creates a highly flexible 190-240 mm usable stroke window, letting you dial in the exact end position during commissioning without adding bulky external stops. Built with a SUS304 stainless steel piston rod, it provides excellent moisture and corrosion resistance for demanding environments.
Delivering 628 N of push force at 0.5 MPa and 879 N at 0.7 MPa, this 40 mm bore cylinder is designed for a 30-800 mm/s speed range. It features PT tapered port threads (G1/4) and utilizes an extruded aluminum barrel with sensor grooves on both sides. Mounting options include the SAIJ subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR styles found on other variants.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-50 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 240 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 SAIJ40BX240-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×240 | 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 SAIJ40BX240-50 Is Used
Variable End-Stop Tuning
Dial in the precise retract position within the 190-240 mm window during machine commissioning, eliminating the need to machine custom spacer collars or swap cylinders for minor length adjustments.
Product Size Changeover
Quickly adapt automated clamping or positioning fixtures to new product lengths on a production line by rotating the rear adjuster screw to shift the end-stop without changing tooling.
Sensor & Switch Placement
Utilize the dual-sided sensor grooves on the extruded aluminum barrel to mount electronic DMSE or reed CMSE switches exactly where needed along the adjustable travel path.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-50 the Right Cylinder?
Choose this 40 mm bore adjustable-stroke unit when your setup requires precise end-position tuning across a 190-240 mm travel window, rather than relying on a fixed-stroke SAI cylinder. If your application requires less force, stepping down to a 32 mm bore yields 402 N at 0.5 MPa; conversely, stepping up to a 50 mm bore provides 982 N.
Because the stroke is 240 mm, ensure adequate external guiding to prevent rod side-loading and premature seal wear. The rear adjuster acts purely as a travel stop to fine-tune deceleration, not as a locking device; this cylinder cannot hold a load without live air pressure. For load-holding requirements, consider an external rod lock, a pilot-operated check valve, or AirTAC SAIL and BSAI series cylinders. To replace an ISO 15552 cylinder, match the 40 mm bore, 240 mm stroke, 50 mm adjustment, PT G1/4 port, and mounting style.
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 SAIJ40BX240-50 FAQ
The rear-mounted adjuster acts as an external mechanical stop, allowing you to shorten the nominal 240 mm stroke by up to 50 mm. This provides a usable travel window of 190 to 240 mm, which can be fine-tuned during commissioning without replacing the cylinder.
At a standard 0.5 MPa operating pressure, this 40 mm bore double-acting cylinder provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N.
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