Airtac SAIJ40 Adjustable Cylinder SAIJ40BX25-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX25-20 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 SAIJ40BX25-20
The AirTAC SAIJ40X25-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the end position during commissioning. With a 25 mm nominal stroke and a 20 mm adjustment screw, it provides a usable travel window of 5 to 25 mm without needing external stops. In the 40 mm bore class, it delivers 628 N of push force and 528 N of pull force at 0.5 MPa, making it well-suited for compact, lower-force tasks.
This variant is built with a SUS304 stainless steel rod (code B) for superior corrosion resistance and features PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE reed or DMSE electronic sensors. It supports a speed range of 30-800 mm/s and uses the standard SAIJ mounting set, which includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX25-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX25-20 |
|---|---|
| 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 SAIJ40BX25-20
| 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 SAIJ40BX25-20 Is Used
Machine Setup Tuning
Dial in the exact 5 to 25 mm travel limit during initial commissioning to perfectly time the stroke without swapping out physical components.
Product Changeover
Quickly adjust the end-stop position on a packaging line when handling a slightly shorter product variant, minimizing downtime.
Lower-Force Positioning
Leverage the 628 N push force at 0.5 MPa for compact assembly tasks where a fixed stroke would otherwise require custom external spacers.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX25-20 the Right Cylinder?
Choose this 40 mm bore cylinder when an application requires precise mechanical end-position tuning at setup or during a product changeover, rather than relying on a fixed-stroke SAI cylinder. If you need slightly less force, stepping down to a 32 mm bore yields 402 N of push force at 0.5 MPa. For heavier demands, stepping up to a 50 mm bore provides 982 N.
Remember that the rear adjuster acts strictly as a travel stop to set deceleration, not as a lock; it will not hold a load without live air pressure. For position-holding requirements, consider an AirTAC SAIL or BSAI cylinder. To replace an ISO 15552 unit, match the 40 mm bore, 25 mm stroke, 20 mm adjustment, PT G1/4 port, and your required mounting hardware.
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 SAIJ40BX25-20 FAQ
At an operating pressure of 0.5 MPa, the 40 mm bore 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 lets you mechanically shorten the 25 mm nominal stroke by up to 20 mm. This creates a usable travel window of 5 to 25 mm, allowing you to set the exact retract position without adding external stops.
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