Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-20S 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 SAIJ40BX650-20S
The AirTAC SAIJ40X650-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 628N of push force and 528N of pull force at 0.5 MPa, utilizing a G1/4 port and a 16mm piston rod. Because this specific SKU carries the -S magnet option, it is fully compatible with AirTAC CMSE reed and DMSE electronic solid-state sensors mounted along the dual sensor grooves.
The -20 adjustment code provides a 630 to 650 mm usable travel window, allowing you to fine-tune the retract end position during commissioning without adding external stops. This configuration features a SUS304 stainless steel rod (code B) for superior corrosion resistance. Note that the rear adjuster functions strictly as a travel stop to set deceleration alongside the standard air cushions; it does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-20S |
|---|---|
| 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 SAIJ40BX650-20S
| 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 SAIJ40BX650-20S Is Used
Variable End-Stop Tuning
Dial in the exact 630-650mm retract position during machine commissioning to accommodate varying material thicknesses without machining new hard stops.
Product Size Changeover
Quickly adjust the stroke end-point on automated packaging lines when switching between different package dimensions, minimizing production downtime.
Extended Reach Positioning
Utilize the 650mm travel to push products across wider conveyor belts, using the SUS304 rod to withstand washdown environments in food processing.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-20S the Right Cylinder?
Choose this 40mm bore when an application requires more force than a 32mm cylinder (which provides 402N push at 0.5 MPa) but lacks the space or air volume for a 50mm unit (982N push). The adjustable 630-650mm stroke is ideal for machine setups requiring variable end-stops or product changeovers, negating the need to swap out a fixed-stroke SAI cylinder. To match this ISO 15552 footprint exactly, specify a 40mm bore, 650mm stroke, 20mm adjustment, PT tapered port threads, and the -S magnet.
Because the 650mm stroke is relatively long, the 16mm rod requires external guidance to prevent excessive side-loading and premature seal wear. Furthermore, if your process demands true load-holding without continuous air pressure, a plain SAIJ cylinder will not suffice; you should instead specify an AirTAC SAIL pneumatic lock or an external rod lock.
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 SAIJ40BX650-20S FAQ
At a standard operating pressure of 0.5 MPa, this 40mm bore cylinder generates 628N of push force and 528N of pull force. At its maximum rated pressure of 1.0 MPa, it can deliver up to 128 kgf.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the effective stroke by up to 20mm. This creates a usable travel window of 630 to 650mm, enabling fine-tuning of the end position at commissioning without replacing the cylinder.
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