Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-50S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-50S 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 SAIJ40BX650-50S
The AirTAC SAIJ40X650-50-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that permits precise end-position tuning. It provides a usable travel window of 600 to 650 mm, allowing you to dial back the nominal stroke by up to 50 mm during commissioning without adding external stops. Delivering 879 N of push force at 0.7 MPa, it is built with a SUS304 stainless steel rod and includes a magnet for CMSE reed and DMSE electronic sensors.
This model uses a G1/4 port and operates at speeds of 30-800 mm/s. The integrated rear adjuster acts purely as a travel stop to decelerate the piston, meaning it will not hold a load without live air pressure. For applications requiring true load-holding, consider the SAIL or BSAI series instead. The extruded aluminum barrel includes sensor grooves on both sides, and the mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-50S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-50S |
|---|---|
| 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 SAIJ40BX650-50S
| 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 SAIJ40BX650-50S Is Used
Machine Changeover
Quickly adapt the extend end-position by up to 50 mm when switching production lines to handle a different product size.
Commissioning Tuning
Fine-tune the exact 600-650 mm travel window during initial setup without physically swapping out the entire cylinder.
Variable End Stops
Adjust the retract stop point on the fly to accommodate varying package dimensions on a sorting line.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-50S the Right Cylinder?
Choose this 40 mm bore when you need more force than the 32 mm bore (563 N at 0.7 MPa) but want to avoid the bulk of the 50 mm option (1374 N). The adjustable stroke is ideal for machine setups requiring variable end stops or frequent product-size changeovers, whereas a fixed SAI cylinder is better for static, unchanging end positions. Because this cylinder lacks a lock, it cannot hold position without continuous air; use a SAIL or BSAI cylinder for load-holding needs.
For this 650 mm stroke, the M12x1.25 rod thread provides good structural support, but long unsupported strokes still require an external guide to prevent excessive side-loading and premature seal wear. This SAIJ40X650-50-S configuration includes PT tapered ports and a -S magnet for sensor integration.
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 SAIJ40BX650-50S FAQ
The rear adjuster screw lets you shorten the effective stroke by up to 50 mm, creating a usable travel window of 600 to 650 mm. It functions as a mechanical stop and does not lock the load without live air.
It delivers 628 N push and 528 N pull force at 0.5 MPa, and 879 N push force at 0.7 MPa.
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