Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-30
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-30 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 SAIJ40BX650-30
The AirTAC SAIJ40X650-30 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 620 to 650 mm usable travel window. Delivering 628 N of push force at 0.5 MPa, it provides robust linear motion while allowing you to fine-tune the retract end position during commissioning. This eliminates the need to swap physical cylinders or bolt on external stops when dialing in a machine.
This SKU is configured with a SUS304 stainless steel rod for superior corrosion resistance and includes a PT tapered port thread. It features a 16 mm piston rod and M12x1.25 rod thread, which handles moderate side loads well, though the 650 mm stroke length still necessitates an external guide to prevent rod binding. The extruded aluminum barrel includes sensor grooves on both sides, ready for future position feedback.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-30 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-30 |
|---|---|
| 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 SAIJ40BX650-30
| 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 SAIJ40BX650-30 Is Used
Machine Changeover
Dial in the retract position up to 30 mm during product size changes without swapping the cylinder or reworking external hard stops.
Variable End Stops
Set precise ejection or positioning distances on a moving line, using the 620 to 650 mm travel window to accommodate varying package dimensions.
Commissioning Fine-Tune
Adjust the rear screw during initial setup to perfectly time the machine cycle and absorb mechanical tolerances without adding spacer shims.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-30 the Right Cylinder?
Choose this 40 mm bore cylinder when an application requires precise end-position tuning without mechanical teardown. If your setup needs less force, stepping down to a 32 mm bore yields 402 N of push at 0.5 MPa; if you need more power, a 50 mm bore provides 982 N. Because the stroke is 650 mm, an external guide is highly recommended to manage side loads and prevent premature seal wear.
The rear adjuster acts strictly as a travel stop and does not hold the load without live air pressure. For applications requiring true load-holding without continuous air, select the SAIL (air-released lock) or BSAI (clamp-lock) series instead. As a dimensionally interchangeable ISO 15552 cylinder, replacement matching requires a 40 mm bore, 650 mm stroke, 30 mm adjustment, PT port, and standard mounting options including 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 SAIJ40BX650-30 FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. It can reach up to 1130 N of push force at 0.9 MPa.
The rear adjuster screw lets you shorten the nominal 650 mm stroke by up to 30 mm, creating a usable travel window of 620 to 650 mm. The adjuster acts as a mechanical stop and does not lock the load without live air pressure.
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