Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-50S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-50S 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 SAIJ40BX70-50S
The AirTAC SAIJ40X70-50-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the effective travel down by up to 50 mm. This creates a highly versatile 20-70 mm usable stroke window, letting you fine-tune the end position during commissioning without swapping out the hardware. It delivers 628 N of push force at 0.5 MPa and operates at speeds between 30-800 mm/s.
This specific configuration includes a SUS304 stainless steel rod for superior corrosion resistance and a built-in magnet (-S) compatible with AirTAC CMSE reed and DMSE electronic sensors. The extruded aluminum barrel features sensor grooves on both sides, and fluid is supplied via PT threaded G1/4 ports. The rear screw acts purely as a travel stop for deceleration, so live air is required to hold the load.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-50S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-50S |
|---|---|
| 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 SAIJ40BX70-50S
| 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 SAIJ40BX70-50S Is Used
Changeover Calibration
Dial in the exact 20-70 mm end-stop during product size changeovers on a packaging line without changing the cylinder.
Variable End Positioning
Fine-tune the retract stroke during machine commissioning to perfectly seat parts without adding external mechanical stops.
Corrosive Assembly Tasks
Leverage the SUS304 stainless steel rod for light assembly tasks in environments requiring high corrosion resistance.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-50S the Right Cylinder?
Choose this 40 mm bore when you need more force than a 32 mm cylinder (which provides 402 N at 0.5 MPa) but want a more compact footprint than the 50 mm option (982 N). The adjustable 20-70 mm window is ideal for machine setups requiring variable end-stops or frequent product-size changeovers, eliminating the need to bolt on external stops. For a fixed end position, a standard SAI cylinder would suffice, but the SAIJ variant provides vital flexibility during setup.
When matching this for an ISO 15552 replacement, verify the 70 mm nominal stroke, 50 mm adjustment range, PT G1/4 port, and the -S magnet requirement. Because the stroke is under 300 mm, side-load stress is minimal, though the robust 16 mm rod and M12x1.25 thread handle standard loads well. If your process requires holding a load without continuous air pressure, the SAIJ adjuster will not act as a lock; consider an AirTAC SAIL or BSAI cylinder instead.
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 SAIJ40BX70-50S 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 screw lets you shorten the 70 mm nominal stroke by up to 50 mm, providing an adjustable travel window of 20 to 70 mm. The screw functions as a mechanical stop to set the end position and does not lock the load without live air.
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