Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-20S 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 SAIJ40BX70-20S
The AirTAC SAIJ40X70-20-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster that allows you to fine-tune the effective travel window down to 50-70 mm from its 70 mm nominal length. Delivering 628N of push force at 0.5 MPa, it bridges the gap between smaller 32mm bores and larger 50mm units. The integrated adjustment screw lets you dial in the retract end position at commissioning without swapping hardware.
This specific SKU is built with a SUS304 stainless steel rod (code B) for superior corrosion resistance in washdown or humid settings. It includes a magnetic piston (-S) for direct compatibility with AirTAC CMSE reed and DMSE electronic sensors. Unlike fixed-stroke SAI cylinders, this adjustable variant omits FB, CA, CB, and CR mounts, retaining a focused set of Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounting interfaces.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-20S |
|---|---|
| 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 SAIJ40BX70-20S
| 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 SAIJ40BX70-20S Is Used
Machine Setup Tuning
Dial in the exact 50 to 70mm travel needed for new jigs during machine changeover without adding external stopper blocks.
Variable Product Diverter
Adjust the retract distance on the fly to handle varying package widths on a packaging line without changing the cylinder.
Corrosion-Resistant Clamping
Leverage the SUS304 stainless steel rod to clamp parts reliably in humid or lightly corrosive manufacturing environments.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-20S the Right Cylinder?
Select this 40mm bore when an application demands precise end-stop tuning during product changeovers, providing 879N of thrust at 0.7 MPa. If your process requires less force, stepping down to a 32mm bore yields 402N; stepping up to a 50mm bore provides 982N. The PT tapered port threads ensure a tight, leak-free pneumatic connection.
Because the rear adjuster acts strictly as a mechanical stop and the air cushions handle deceleration, this cylinder cannot hold a load without live air pressure. For fail-safe load holding on vertical strokes, consider an AirTAC SAIL pneumatic lock, a BSAI clamp-lock cylinder, or an external 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 SAIJ40BX70-20S FAQ
At 0.5 MPa operating pressure, this 40mm bore cylinder provides 628N of push force and 528N of pull force. If operated at 0.7 MPa, the push force increases to 879N.
The rear adjuster screw allows you to shorten the 70mm nominal stroke by up to 20mm, creating a usable travel window of 50-70mm. This stopper sets the end position but does not lock the load without air pressure.
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