Airtac SAIJ40 Adjustable Cylinder SAIJ40BX25-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX25-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 25mm 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
- Stroke25 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX25-20S
The AirTAC SAIJ40X25-20-S is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a nominal 25mm stroke that can be fine-tuned backward by up to 20mm, creating a highly versatile 5-25mm usable travel window. Delivering 628N of push force at 0.5 MPa, it is built with a SUS304 stainless steel rod for superior corrosion resistance.
This configuration includes a piston magnet for position detection using CMSE reed or DMSE electronic solid-state sensors. The extruded aluminum barrel features sensor grooves on both sides for flexible switch mounting. Unlike a fixed-stroke SAI cylinder, this model allows you to dial in the exact end-position at commissioning without swapping the hardware or adding bulky external stops.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX25-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX25-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 25 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 SAIJ40BX25-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×25 | 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 SAIJ40BX25-20S Is Used
Micro-Clamping Setup
Dial in the exact 5-25mm clamping travel during machine commissioning to accommodate varying raw material thicknesses without changing hardware.
Product Changeover
Rapidly adjust the end-stop position on a packaging line when switching between different product sizes, utilizing the 20mm adjustment range.
Lab Test Fixtures
Leverage the SUS304 stainless steel rod and precise stroke tuning for sensitive testing environments requiring exact positional endpoints.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX25-20S the Right Cylinder?
Select this 40mm bore cylinder when an application requires 628N of push force at 0.5 MPa (or 879N at 0.7 MPa) within a very tight physical envelope. If you need less force, the 32mm bore offers 402N; if you need more, the 50mm bore provides 982N. The PT tapered port threads ensure a robust, sealed pneumatic connection.
The rear adjuster acts purely as a mechanical travel stop to set the retract end-position and deceleration; it is not a locking device. This SAIJ cylinder will not hold a load without live air pressure. For true load-holding requirements without continuous air, consider the SAIL (air-released lock) or BSAI (clamp-lock) series. For ISO 15552 replacement matching, specify the 40mm bore, 25mm stroke, 20mm adjustment, PT port thread, Basic/LB/TC mounting, and the -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 SAIJ40BX25-20S FAQ
It features a rear adjusting screw that allows you to shorten the effective stroke by up to 20mm. This turns the 25mm nominal stroke into a 5-25mm adjustable travel window, letting you fine-tune the end position without adding external stops.
At 0.5 MPa operating pressure, the SAIJ40X25-20-S provides 628N of push force and 528N of pull force. At 0.7 MPa, the push force increases to 879N.
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