Airtac SAIJ40 Adjustable Cylinder SAIJ40BX80-40S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX80-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 80mm 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
- Stroke80 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX80-40S
The AirTAC SAIJ40X80-40-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 80 mm stroke that can be dialed back by up to 40 mm, giving you a precise 40-80 mm usable travel window for commissioning or product changeovers without swapping out the unit. It delivers 628 N of push force and 528 N of pull force at 0.5 MPa.
This variant features a SUS304 stainless steel rod for superior corrosion resistance and includes a magnet (-S) for electronic or reed sensing. It uses PT tapered ports and offers variable air cushions at both ends. The extruded aluminum barrel includes sensor grooves on both sides, and the rear adjustment screw acts purely as a travel stop—it does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX80-40S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX80-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 80 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 SAIJ40BX80-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×80 | 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 SAIJ40BX80-40S Is Used
Variable Product Changeover
Dial in the stroke from 40 to 80 mm on the fly to accommodate different package sizes or part lengths on a single conveyor line without changing cylinders.
Exact End-Stop Calibration
Fine-tune the retract end-position during machine commissioning to achieve perfect alignment without adding external mechanical stops.
Corrosive Environment Actuation
Leverage the SUS304 stainless steel rod for clamping and positioning tasks in wash-down or mildly corrosive industrial environments.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX80-40S the Right Cylinder?
Choose this 40 mm bore when your application requires up to 628 N of push force at 0.5 MPa, stepping up from a 32 mm bore (402 N push) for heavier clamping or lifting, but without needing the 982 N thrust of a 50 mm bore. The 40 mm adjustment range on an 80 mm stroke is exceptionally wide, allowing you to cut the effective travel in half for highly variable product sizes. Since the stroke is 80 mm, side-loading is minimal, but always ensure the load is guided to prevent binding.
An adjustable-stroke SAIJ is selected over a fixed-stroke SAI when you need on-the-fly end-position tuning at machine setup. For load-holding without continuous air pressure, this cylinder is not suitable; the rear adjuster is a stop, not a lock. You would need an AirTAC SAIL or BSAI series instead. As a true ISO 15552 profile cylinder, it is dimensionally interchangeable with other ISO 15552 cylinders, utilizing PT ports and mounting options limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ40BX80-40S 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 operating pressure of 1.0 MPa, it can deliver up to 1130 N of push force.
The SAIJ40X80-40-S has a nominal 80 mm stroke, but the rear adjuster screw allows you to trim the effective travel back by up to 40 mm. This creates a usable travel window of 40-80 mm. The adjuster acts as a mechanical stop for the retract end-position and does not lock the load without live air pressure.
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