Airtac SAIJ40 Adjustable Cylinder SAIJ40BX350-40S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX350-40S 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 SAIJ40BX350-40S
The AirTAC SAIJ40X350-40-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 879N of push force at 0.7 MPa. It features a SUS304 stainless steel rod and a PT tapered port. By turning the rear screw, you achieve a usable travel window of 310 to 350 mm, enabling precise end-position tuning without swapping out the entire actuator.
Because the nominal 350 mm stroke is relatively long, the 16 mm rod and M12x1.25 thread provide robust support, though an external guide is still recommended for heavy lateral loads. This -S variant includes a magnet for CMSE reed and DMSE electronic sensors, which seat neatly into the dual-side extruded barrel grooves. The adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX350-40S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX350-40S |
|---|---|
| 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 SAIJ40BX350-40S
| 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 SAIJ40BX350-40S Is Used
Product Size Changeovers
Dial in the exact 310 to 350 mm end-stop during format size changes on a packaging line, avoiding the need to physically swap cylinders for different carton widths.
Commissioning Fine-Tuning
Trim the retract position by up to 40 mm during machine setup to perfectly align a gripper jaw, compensating for mechanical tolerance stack-up without external shims.
Adjustable Diverting
Act as a variable diverter gate on a conveyor, where the 40 mm stroke adjustment allows operators to quickly reconfigure the travel distance for varying package lengths.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX350-40S the Right Cylinder?
Choose this 40 mm bore when a 32 mm bore (providing 563N push at 0.7 MPa) lacks the necessary thrust, but a 63 mm bore (2182N) would be physically oversized. The 40 mm adjustment code is selected when a machine requires a 310 to 350 mm stroke window to accommodate multiple product sizes on a single line. Instead of machining custom spacers or buying a fixed SAI cylinder for every format, this adjustable-stroke unit allows on-the-fly changeovers.
For a drop-in ISO 15552 replacement, match the 40 mm bore, 350 mm nominal stroke, 40 mm adjustment, PT port thread, and the -S magnet option. Note that SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, omitting FB, CA, CB, and CR. Since the stroke is 350 mm, ensure external guiding to prevent excessive side loading on the rod. If your process requires the load to be held mechanically without continuous air pressure, select a SAIL lock or BSAI clamp-lock cylinder instead, as this adjuster is not a brake.
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 SAIJ40BX350-40S FAQ
At 0.5 MPa it provides 628N push and 528N pull force. At 0.7 MPa the push force is 879N, and it reaches 1130N at 0.9 MPa.
A rear screw stopper lets you mechanically shorten the effective travel from the 350 mm nominal stroke down to 310 mm. This creates a 310-350 mm adjustable window for fine-tuning the end position at commissioning, without acting as a load-holding lock.
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