Airtac SAIJ40 Adjustable Cylinder SAIJ40BX45-40S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX45-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 45mm 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
- Stroke45 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX45-40S
The AirTAC SAIJ40X45-40-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the nominal 45 mm travel back by up to 40 mm. This creates a highly versatile 5 to 45 mm usable travel window, letting you dial in the exact end-of-stroke position at commissioning without swapping hardware. It delivers 628 N of push force at 0.5 MPa and uses a SUS304 stainless steel rod for superior corrosion resistance.
Equipped with a built-in magnet (-S), this unit supports AirTAC CMSE reed and DMSE electronic sensors housed neatly in the dual-side sensor grooves. The rear stopper mechanism acts solely as a travel end-deceleration device alongside the variable air cushions, meaning it will not hold a load safely without live air pressure. For any load-holding requirements, a dedicated SAIL pneumatic lock or external pilot-operated check valve is required.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX45-40S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX45-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 45 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 SAIJ40BX45-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×45 | 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 SAIJ40BX45-40S Is Used
Product Changeover
Dial in the 5 to 45 mm travel window instantly when switching product sizes on a packaging line, avoiding mechanical teardown.
End-Stop Calibration
Fine-tune the final retract position during machine commissioning using the rear adjuster rather than adding external stopper blocks.
Sensor Trigger Setup
Leverage the integrated magnet and DMSE electronic sensors to confirm the adjusted position profile during automated sequencing.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX45-40S the Right Cylinder?
Choose this 40 mm bore when you need precise 5 to 45 mm travel tuning on a machine changeover, rather than machining custom spacers or buying a fixed-stroke SAI cylinder. If your process requires less than 5 mm of total travel, stepping down to a 32 mm bore (offering 402 N push force at 0.5 MPa) might provide a more compact footprint, but the 40 mm bore's M12x1.25 rod thread handles greater side loads. To match this ISO 15552 footprint exactly, specify the 40 mm bore, 45 mm stroke, 40 mm adjustment, PT tapered port, and the -S magnet. Mounting options are 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 SAIJ40BX45-40S FAQ
At a standard 0.5 MPa operating pressure, this 40 mm bore cylinder generates 628 N of push force and 528 N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 128 kgf.
The cylinder has a 45 mm nominal stroke with a 40 mm rear adjustment mechanism. This allows the effective travel to be fine-tuned anywhere within a 5 to 45 mm window without changing the cylinder.
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