Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-100
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-100 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 425mm 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
- Stroke425 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-100
The AirTAC SAIJ40X425-100 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 879 Newtons of push force at 0.7 MPa and features a generous 425 mm nominal stroke that can be fine-tuned down by up to 100 mm, creating a precise 325-425 mm usable travel window. This built-in adjustability allows operators to dial in the exact end position during commissioning without adding external stops.
This specific configuration incorporates a SUS304 stainless steel piston rod for superior corrosion resistance, making it well-suited for environments where standard carbon steel rods might degrade. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE or DMSE switches, though this particular SKU is supplied without a magnet. It operates efficiently at speeds between 30 and 800 mm/s and uses a G1/4 port.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-100 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-100 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 425 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 SAIJ40BX425-100
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×425 | 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 SAIJ40BX425-100 Is Used
Machine Changeover
Quickly adapt a packaging line to different carton depths by dialing the rear adjuster back within the 325-425 mm window, eliminating the need to physically swap out cylinders.
End-Position Tuning
Fine-tune the retract stroke during initial commissioning to achieve perfect alignment of tooling without fabricating custom external stopper blocks.
Corrosive Assembly Lines
Leverage the SUS304 stainless steel rod for pushing or lifting tasks in washdown or mildly corrosive industrial environments where carbon steel would fail.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-100 the Right Cylinder?
Select this 40 mm bore cylinder when an application requires a variable end-stop within a 325 to 425 mm travel range. If your setup needs less force, stepping down to a 32 mm bore yields 563 N of push force at 0.7 MPa; conversely, stepping up to a 50 mm bore provides 1374 N. Because this model features a 425 mm stroke, the 16 mm diameter rod and M12x1.25 rod thread provide structural rigidity, but an external guide is still recommended to prevent excessive side-loading on long unsupported travels.
The rear adjuster acts strictly as a travel stop to decelerate the piston alongside the standard air cushions, not as a locking device. This SAIJ cylinder will not hold a load without continuous live air pressure, so applications requiring true load-holding should utilize an external rod lock or explore the AirTAC SAIL or BSAI series. For a direct ISO 15552 replacement match, ensure you specify the 40 mm bore, 425 mm stroke, 100 mm adjustment, PT tapered port threads, SUS304 rod material, and the correct mounting bracket from the available Basic, FA, LB, TC, FTC, TCM1, or TCM2 set.
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 SAIJ40BX425-100 FAQ
At a standard operating pressure of 0.5 MPa, 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 allows you to shorten the 425 mm nominal stroke by up to 100 mm, providing a usable travel window of 325 to 425 mm. The adjuster acts as a mechanical stop to set the end position and does not lock the load without live air pressure.
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