Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-40S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 70mm 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
- Stroke70 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-40S
The AirTAC SAIJ40X70-40-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the 70 mm nominal travel by up to 40 mm. This yields a highly versatile 30-70 mm usable window for fine-tuning end positions at commissioning. It delivers 628 N of push force at 0.5 MPa and features a SUS304 stainless steel rod for superior corrosion resistance.
Fitted with a magnet (-S), this unit supports AirTAC CMSE reed and DMSE electronic sensors housed within the dual-side extruded barrel grooves. The PT-tapered G1/4 port and M12x1.25 rod thread provide robust connectivity, while the rear adjuster acts purely as a travel stop for deceleration rather than a load-holding lock.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-40S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 70 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 SAIJ40BX70-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×70 | 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 SAIJ40BX70-40S Is Used
Machine Changeovers
Rapidly reconfigure end-stops for different product sizes on a packaging line without disassembling the cylinder mount.
Sensor Positioning
Leverage the built-in magnet with DMSE electronic sensors to confirm the exact adjusted end-of-travel position.
Corrosive Environments
Utilize the SUS304 stainless steel rod in light chemical or washdown areas where carbon steel would degrade.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-40S the Right Cylinder?
Choose this 40 mm bore when an application requires precise mechanical end-stop tuning without swapping cylinders; if you need less force, the 32 mm bore offers 402 N at 0.5 MPa. The wide 30-70 mm adjustable window is ideal for product changeovers on packaging lines. For exact ISO 15552 replacement matching, verify the 70 mm stroke, 40 mm adjustment, PT port, and -S magnet.
Because the stroke is under 300 mm, side-load stress on the M12x1.25 rod is minimal, though external guiding remains good practice for heavy lateral loads. Remember that the rear adjuster only sets the travel end; to hold a load securely without live air pressure, you must use an external rod lock or pilot-operated check valve.
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 SAIJ40BX70-40S FAQ
At a 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. It can reach up to 1130 N of push force at 0.9 MPa.
The rear adjuster screw allows you to shorten the 70 mm nominal stroke by up to 40 mm, creating a usable travel window of 30 to 70 mm. This stopper only sets the end position and does not lock the load without air pressure.
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