Airtac SAIJ40 Adjustable Cylinder SAIJ40BX65-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX65-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 65mm 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
- Stroke65 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX65-20
The AirTAC SAIJ40X65-20 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster that allows you to fine-tune the effective travel down to a 45-65 mm window. Delivering 628 N of push force at 0.5 MPa, it bridges the gap between compact 32 mm units and heavier 50 mm models. The extruded aluminum barrel includes sensor grooves on both sides for straightforward detection integration.
This specific configuration utilizes a SUS304 stainless steel rod for superior corrosion resistance and ships with PT tapered port threads. Because the rear stopper only trims the retract end position, it functions as a travel deceleration point rather than a load-holding lock; for dead-air positioning, a SAIL or BSAI variant is required.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX65-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX65-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 65 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 SAIJ40BX65-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×65 | 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 SAIJ40BX65-20 Is Used
Product Changeover
Dial in the 45-65 mm travel window rapidly on packaging lines when switching between different container sizes, avoiding mechanical teardown.
End-Stop Calibration
Fine-tune the final retract position during machine commissioning to achieve precise alignment without adding external shims.
Corrosive Assembly
Leverage the SUS304 stainless steel rod for pushing or clamping tasks in environments where moisture or mild chemicals are present.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX65-20 the Right Cylinder?
Selecting this 40 mm bore makes sense when a 32 mm cylinder (providing 402 N push at 0.5 MPa) lacks thrust, but a 50 mm unit (982 N) is physically excessive. The 20 mm adjustment range is highly beneficial during machine commissioning or product changeovers, enabling precise end-stop tuning without machining external spacers or replacing a fixed-stroke SAI cylinder. To match this exact SKU in a replacement scenario, verify the 65 mm stroke, 20 mm adjuster, PT porting, SUS304 rod, and the standard mounting set (Basic, FA, LB, TC, FTC, TCM1, 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 SAIJ40BX65-20 FAQ
At a standard 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. If your application requires higher thrust, stepping up to a 50 mm bore increases the push force to 982 N at the same pressure.
The rear adjusting screw acts as an external stopper that shortens the 65 mm nominal stroke, creating a usable travel window of 45 to 65 mm. It trims the end position and relies on the air cushion for deceleration, but it does not lock or hold the load without continuous air pressure.
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