Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 300mm 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
- Stroke300 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-20
The AirTAC SAIJ40X300-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 280-300 mm usable travel window. It delivers 628 N of push force and 528 N of pull force at 0.5 MPa, utilizing a 16 mm piston rod with an M12x1.25 thread.
This configuration uses a SUS304 stainless steel rod for enhanced corrosion resistance and features PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, ready to accept CMSE reed or DMSE electronic switches if a magnet is added later. The rear adjuster acts purely as a mechanical stop for end-position tuning and does not lock the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 300 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 SAIJ40BX300-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×300 | 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 SAIJ40BX300-20 Is Used
Product Changeovers
Dial in the exact end-stop between 280 and 300 mm during product size changes without disassembling the machine or adding shims.
Sorting Diverter Setup
Fine-tune the retract position on a sorting arm to accommodate varying package dimensions on the fly.
Commissioning Calibration
Precisely set the travel limit during initial machine commissioning to prevent over-travel and ensure repeatable positioning.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-20 the Right Cylinder?
Choose this 40 mm bore cylinder when an application requires 628 N push force at 0.5 MPa, stepping up from a 32 mm bore (402 N) if marginally higher thrust is needed, or down from a 50 mm bore (982 N) to save space and air volume. The 20 mm adjustment range is ideal for product changeovers, allowing you to dial back the 300 mm nominal stroke to a 280 mm minimum without swapping the cylinder or adding external stops.
Because the 300 mm stroke is relatively long, the 16 mm rod should be guided externally to prevent sagging and side-load damage. Remember that the rear adjuster and air cushions only decelerate the travel end; for true load-holding without live air, select a SAIL pneumatic lock or BSAI clamp-lock cylinder instead. This unit is dimensionally interchangeable per ISO 15552 and uses a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and 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 SAIJ40BX300-20 FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At the maximum pressure of 1.0 MPa, it can deliver up to 128 kgf.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the effective stroke from its nominal 300 mm down to 280 mm. This creates a 280-300 mm travel window for fine-tuning end positions without replacing the cylinder.
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