Airtac SAIJ40 Adjustable Cylinder SAIJ40BX350-50
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX350-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 350mm 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
- Stroke350 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX350-50
The AirTAC SAIJ40X350-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the travel window between 300 and 350 mm without adding external stops. Built with a SUS304 stainless steel rod and PT tapered ports, it delivers 628N of push force at 0.5 MPa, making it a solid choice for mid-range actuation. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE or DMSE switches.
Because the nominal 350 mm stroke is relatively long, the 16 mm rod diameter should be paired with an external guide to prevent excessive side loading. The rear adjuster acts purely as a travel stop for end-position deceleration; it is not a lock, so the cylinder will not hold a load without live air pressure. For load-holding applications, consider an external pilot-operated check valve or the SAIL series.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX350-50 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX350-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 350 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 SAIJ40BX350-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×350 | 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 SAIJ40BX350-50 Is Used
Product Size Changeovers
Quickly adapt a packaging line to different carton lengths by dialing back the stroke up to 50 mm, avoiding physical cylinder swaps during product transitions.
End-Stop Calibration
Fine-tune the final retract position during machine commissioning to achieve exact seating of components without machining custom spacers.
Variable Diverter Travel
Adjust the pusher stroke window between 300 and 350 mm on a conveyor to handle varying package widths without repositioning the entire actuator assembly.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX350-50 the Right Cylinder?
Select this 40 mm bore model when your setup requires precise end-position calibration during commissioning or product changeovers, stepping up from a 32 mm bore that provides only 402N of push force at 0.5 MPa. The 50 mm adjustment range lets you dial in the exact travel needed for varying product sizes on a single line. If your force requirements are higher, moving to a 50 mm bore increases the push force to 982N at 0.5 MPa.
When replacing an ISO 15552 cylinder, match the 40 mm bore, 350 mm stroke, 50 mm adjustment, PT G1/4 port, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that this adjustable variant omits the FB, CA, CB, and CR mounts. Given the 350 mm stroke, always support the load with an external guide to manage side loads on the rod thread.
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 SAIJ40BX350-50 FAQ
The rear adjuster screw acts as an external stopper, allowing you to shorten the effective travel from the nominal 350 mm down to 300 mm. It decelerates the end position but does not lock the load without live air pressure.
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628N of push force and 528N of pull force. It can reach up to 1130N of push force at 0.9 MPa.
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