Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-30S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 650mm 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
- Stroke650 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-30S
The AirTAC SAIJ40X650-30-S is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear stroke adjuster. It delivers 879N of push force at 0.7 MPa and provides a usable travel window of 620 to 650 mm, letting you trim up to 30 mm of stroke during machine commissioning. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE reed or DMSE electronic switches.
This unit is built with a SUS304 stainless steel rod for superior corrosion resistance and uses PT tapered port threads. It carries adjustable air cushions at both ends to decelerate the load smoothly. Remember that the rear adjuster functions strictly as a travel stop, not a lock, so it cannot hold a load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-30S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 650 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 SAIJ40BX650-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×650 | 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 SAIJ40BX650-30S Is Used
Product Changeover
Dial in the 620-650 mm travel window on packaging lines when switching to a different carton size, avoiding the need to physically swap cylinders.
End-Position Tuning
Fine-tune the retract stop during machine setup to perfectly align a tooling head, absorbing mechanical tolerances without external shims.
Variable End Stops
Adjust the stroke dynamically on diverter gates to handle varying package lengths on a single conveyor line.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-30S the Right Cylinder?
Select this 40 mm bore cylinder when an application requires exact end-position tuning without swapping components or adding external stops. If your process needs less force, stepping down to a 32 mm bore yields 563N at 0.7 MPa; if you need more power, a 50 mm bore provides 1374N. For load-holding requirements without continuous air pressure, consider the SAIL or BSAI series instead, as the SAIJ adjuster only restricts travel.
Because the 650 mm stroke is relatively long, the 16 mm rod diameter will still require an external guide to prevent excessive side-loading on the piston. This SAIJ model is dimensionally interchangeable per ISO 15552 and supports a mounting subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2. Operating speed ranges from 30-800 mm/s.
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 SAIJ40BX650-30S FAQ
It features a rear adjusting screw that allows you to shorten the effective stroke by up to 30 mm. This creates a usable travel window of 620 to 650 mm, enabling fine-tuning of the end position at commissioning without changing the cylinder.
At 0.7 MPa operating pressure, the push force is 879N and the pull force is 528N. At the maximum pressure of 1.0 MPa, it can deliver up to 128 kgf of push force.
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