Airtac SAIJ40 Adjustable Cylinder SAIJ40BX180-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX180-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 180mm 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
- Stroke180 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX180-20S
The AirTAC SAIJ40X180-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 180 mm travel by up to 20 mm. This creates a precise 160-180 mm usable stroke window, perfect for fine-tuning end positions during commissioning without swapping out the entire unit. It delivers 628 N of push force at 0.5 MPa and features a SUS304 stainless steel rod for superior corrosion resistance.
This model includes a magnet (-S) for use with AirTAC CMSE reed and DMSE electronic sensors, which seat neatly into the sensor grooves on both sides of the extruded aluminum barrel. The PT tapered port threads match the standard G1/4 porting for this bore size. Remember that the rear adjuster acts only as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX180-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX180-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 180 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 SAIJ40BX180-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×180 | 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 SAIJ40BX180-20S Is Used
Commissioning Fine-Tuning
Dial in the exact 160-180 mm end position during machine setup to perfect the seating force of a pressing assembly without adding external stops.
Product Changeover
Quickly adjust the retract stop by up to 20 mm on a packaging line when switching between different product sizes, minimizing downtime.
Variable End-Stop Machining
Use the rear adjuster to set precise retract limits on a multi-tool machining station where tool lengths vary slightly between jobs.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX180-20S the Right Cylinder?
Choose this 40 mm bore when you need 628 N push force at 0.5 MPa, stepping up from a 32 mm bore (402 N) or down from a 63 mm bore (1559 N). An adjustable stroke is ideal for machine setups requiring variable end-stops or frequent product changeovers, saving the cost of stocking multiple fixed-stroke SAI cylinders. To match this ISO 15552 interchangeable cylinder, specify bore 40, stroke 180, adjust 20, PT ports, and the -S magnet.
Since the stroke is 180 mm, side-load stress is moderate, but the 16 mm rod and M12x1.25 rod thread handle it well; for longer unsupported strokes, always use an external guide. If your application requires true load-holding without continuous air pressure, the SAIJ adjuster will not suffice—consider an external rod lock or the AirTAC SAIL lock cylinder instead.
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 SAIJ40BX180-20S 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 0.7 MPa, the push force increases to 879 N.
The rear adjuster screw allows you to shorten the 180 mm nominal stroke by up to 20 mm, creating a usable travel window of 160 to 180 mm. It functions as a mechanical stop and does not lock the load without live air pressure.
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