Airtac SAIJ40 Adjustable Cylinder SAIJ40BX20-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX20-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 20mm 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
- Stroke20 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX20-20S
The AirTAC SAIJ40X20-20-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 0 to 20 mm, allowing you to dial in the exact end position during machine commissioning without adding external stops. Built with a SUS304 stainless steel rod, it yields 628N of push force and 528N of pull force at 0.5 MPa.
This model includes a magnet for position sensing, compatible with AirTAC CMSE reed and DMSE electronic switches fitted into the dual-side sensor grooves. It uses PT tapered ports sized G1/4 and relies on a 30 mm variable air cushion at both ends to decelerate the load. The adjuster acts purely as a travel stop and will not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX20-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX20-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 20 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 SAIJ40BX20-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×20 | 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 SAIJ40BX20-20S Is Used
Machine Setup Tuning
Perfect for dialing in the exact clamping distance during initial equipment commissioning, allowing operators to fine-tune the 0-20mm travel window on the fly.
Product Changeover
Ideal for packaging lines that run multiple product sizes, letting operators quickly adjust the retract stop to accommodate varying package dimensions.
Variable End Stops
Provides a reliable physical stop for light-duty positioning tasks where the exact extension distance needs to be tweaked without swapping out the entire actuator.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX20-20S the Right Cylinder?
Choose this adjustable-stroke cylinder when your application requires precise end-position tuning on a short-stroke setup, rather than relying on a fixed-stroke SAI cylinder. If your project requires higher force, stepping up to the 50mm bore provides 982N of push force at 0.5 MPa. Conversely, compact assemblies with lower force needs can step down to the 32mm bore, offering 402N.
To match this ISO 15552 interchangeable profile, specify a 40mm bore, 20mm nominal stroke, 20mm adjustment range, PT G1/4 ports, and the -S magnet option. The mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2. Because the rear screw acts only as a stop, load-holding without live air requires a SAIL or BSAI cylinder.
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 SAIJ40BX20-20S FAQ
At a 0.5 MPa operating pressure, this 40mm bore cylinder generates 628N of push force and 528N of pull force. It can reach up to 1130N of push force at 0.7 MPa.
The rear adjuster screw lets you shorten the effective travel from its 20mm nominal stroke down to 0mm. This creates a 0-20mm adjustable window for fine-tuning the end position without replacing the cylinder.
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