Airtac SAIJ40 Adjustable Cylinder SAIJ40BX40-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX40-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 40mm 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
- Stroke40 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX40-20S
The AirTAC SAIJ40X40-20-S is a double-acting ISO 15552 profile cylinder with a rear stroke adjuster, letting you dial back the 40mm nominal stroke by up to 20mm to achieve a precise 20-40mm usable travel window. Delivering 628N of push force at 0.5MPa, it suits light-to-medium automation. The integrated magnet works with CMSE reed and DMSE electronic sensors for exact end-position detection.
This SKU features a SUS304 stainless steel rod for corrosion resistance and PT tapered ports. Unlike fixed-stroke SAI models, the external rear stopper allows fine end-position tuning at commissioning without swapping cylinders. The adjuster acts purely as a travel stop and does not hold the load without live air pressure. Mounting options cover Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX40-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX40-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 40 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 SAIJ40BX40-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×40 | 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 SAIJ40BX40-20S Is Used
Machine Changeover
Dial in the exact 20-40mm end-stop during product size changes without adding external stops.
Light Assembly
Provides 628N push force at 0.5MPa for precise pressing and joining tasks requiring fine positioning.
Sensor Integration
The -S magnet pairs with DMSE electronic and CMSE reed switches in the dual sensor grooves.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX40-20S the Right Cylinder?
Choose this 40mm bore if 628N of push force at 0.5MPa is sufficient, or step down to the 32mm bore (402N push) for lighter loads. The adjustable 20-40mm travel window is ideal for product changeovers where exact end-stops vary. For load-holding without live air, select the SAIL lock or BSAI clamp-lock cylinder instead, as the SAIJ rear screw is a stop, not a brake. This model is dimensionally interchangeable per ISO 15552 with a PT port thread and -S magnet.
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 SAIJ40BX40-20S FAQ
The rear adjuster screw lets you shorten the effective stroke by up to 20mm, creating a 20-40mm usable travel window. This allows precise end-position tuning at commissioning without replacing the cylinder.
At 0.5MPa operating pressure, the 40mm bore provides 628N of push force and 528N of pull force. It can reach up to 1130N push force at 0.9MPa.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Request a Quote for Airtac SAIJ40 Adjustable Cylinder SAIJ40BX40-20S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.