Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-10S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-10S 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 SAIJ40BX70-10S
The AirTAC SAIJ40X70-10-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, enabling you to dial back the 70 mm nominal stroke by up to 10 mm for a precise 60 to 70 mm usable travel window. Delivering 628 N of push force at 0.5 MPa, it handles lighter positioning tasks with ease. The extruded aluminum barrel features sensor grooves on both sides, and because this variant includes a magnet (-S), it works seamlessly with AirTAC CMSE reed and DMSE electronic solid-state switches.
This model features a SUS304 stainless steel rod (code B) for superior corrosion resistance and carries a PT tapered port thread. The rear adjuster acts purely as a mechanical stop to fine-tune the end position during commissioning; it does not lock the load. For applications requiring true load-holding without live air pressure, consider the SAIL or BSAI series instead.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-10S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-10S |
|---|---|
| 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 SAIJ40BX70-10S
| 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 SAIJ40BX70-10S Is Used
Machine Changeover
Dial in the 60-70 mm travel window during product size transitions on a packaging line without replacing the cylinder.
End-Position Tuning
Fine-tune the retract stop during commissioning to achieve exact placement of lightweight 628 N thrust components.
Variable End Stops
Adjust the rear mechanical stop on the fly for assembly stations handling multiple part lengths within the 10 mm range.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-10S the Right Cylinder?
Select this 40 mm bore when a 32 mm bore (402 N push at 0.5 MPa) lacks the necessary thrust, but a 50 mm bore (982 N push) would be excessive overkill. An adjustable stroke is chosen over a fixed SAI cylinder when you need variable end-stops for product changeovers or fine-tuning at machine setup without swapping hardware. Because this is a 70 mm stroke, side-loading is minimal, but always ensure the M12x1.25 rod thread is properly aligned to prevent binding.
To match this ISO 15552 replacement exactly, specify: 40 mm bore, 70 mm stroke, 10 mm adjustment range, PT tapered G1/4 port, and the -S magnet option. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, intentionally omitting FB, CA, CB, and CR to focus on standard profile mounting interfaces.
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 SAIJ40BX70-10S FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 1130 N of push force.
The rear adjuster screw lets you shorten the 70 mm nominal stroke by up to 10 mm, creating a 60-70 mm usable travel window. This mechanical stop fine-tunes the end position but does not hold the load without live air pressure.
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