Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-30S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-30S 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 SAIJ40BX70-30S
The AirTAC SAIJ40X70-30-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 30 mm. This creates a highly versatile 40-70 mm usable stroke window, letting you dial in the exact end position during commissioning without swapping out the entire actuator. It delivers a robust 628 N of push force at 0.5 MPa, making it well suited for moderate load positioning tasks.
Equipped with a SUS304 stainless steel rod (option B) and a PT tapered port thread, this unit provides excellent moisture and corrosion resistance. The integrated magnet (-S) supports position sensing via AirTAC CMSE reed or DMSE electronic solid-state switches mounted in the dual sensor grooves. It utilizes the standard SAIJ mounting subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR brackets.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-30S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-30S |
|---|---|
| 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 SAIJ40BX70-30S
| 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 SAIJ40BX70-30S Is Used
Product Changeovers
Quickly adjust the 40-70 mm travel window to accommodate varying package sizes on a packaging line without changing the cylinder.
Machine Commissioning
Fine-tune the exact retract end-stop during initial setup to perfect tooling alignment without machining new spacer blocks.
Variable End Stops
Use the rear stopper screw to set precise positioning limits for light-duty assembly tasks requiring repeatable depth control.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-30S the Right Cylinder?
Choose this 40 mm bore actuator when you need the 628 N push force at 0.5 MPa and on-the-fly end-position tuning; if your application requires less force, stepping down to a 32 mm bore yields 402 N, while moving up to a 50 mm bore provides 982 N. The adjustable stroke is perfect for machines handling multiple product sizes, as the rear screw acts as a hard stop to fine-tune the retract distance without adding external stops. For a direct ISO 15552 replacement, match the 40 mm bore, 70 mm nominal stroke, 30 mm adjustment, PT port, and -S magnet.
Because the nominal stroke is 70 mm, side-load risks are minimal, but always ensure the load is guided to prevent rod binding. Remember that the rear adjuster and the variable air cushions only decelerate the stroke; they do not hold the load. If your process requires true load-holding without live air pressure, you must use an external rod lock, a pilot-operated check valve, or switch to an AirTAC SAIL or BSAI locking cylinder.
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 SAIJ40BX70-30S FAQ
The rear adjuster screw allows you to shorten the 70 mm nominal stroke by up to 30 mm, providing a usable travel window of 40 to 70 mm. This lets you set the exact retract end position during commissioning without adding external stops.
At a standard 0.5 MPa operating pressure, the SAIJ40X70-30-S generates 628 N of push force and 528 N of pull force. At its maximum 1.0 MPa pressure, it can deliver up to 1130 N of push force.
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