Airtac SAIJ40 Adjustable Cylinder SAIJ40BX700-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX700-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 700mm 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
- Stroke700 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX700-20S
The AirTAC SAIJ40X700-20-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 680-700 mm usable travel window, letting you fine-tune the end position by up to 20 mm during commissioning without adding external stops. It delivers 628 N of push force and 528 N of pull force at 0.5 MPa.
This SKU uses a SUS304 stainless steel rod for corrosion resistance and includes a magnet for CMSE reed and DMSE electronic sensors. The extruded aluminum barrel offers sensor grooves on both sides. It features a G1/4 port and M12x1.25 rod thread, operating at speeds from 30-800 mm/s.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX700-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX700-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 700 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 SAIJ40BX700-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×700 | 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 SAIJ40BX700-20S Is Used
Machine Setup Tuning
Dial in the exact 680-700 mm end position during initial commissioning to perfect a press fit without machining hard stops.
Product Size Changeover
Quickly adapt the stroke length on a packaging line when product dimensions change by adjusting the rear screw.
Variable End Stops
Provide a precise mechanical stop for varying material lengths while maintaining the standard ISO 15552 mounting footprint.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX700-20S the Right Cylinder?
Choose this 40 mm bore if you need 628 N push force at 0.5 MPa, stepping down from a 63 mm bore (1559 N) for a lighter payload, or up from a 32 mm bore (402 N) for higher thrust. The adjustable stroke is ideal for product changeovers where the exact end-stop varies by up to 20 mm, eliminating the need to physically swap a fixed-stroke SAI cylinder.
Because the 700 mm stroke is long, the M12x1.25 rod requires an external guide to prevent excessive side-loading. For load-holding without live air, note the rear adjuster is a travel stop, not a lock; you would need an SAIL or BSAI cylinder instead. This configuration uses PT tapered ports, SUS304 rod, and a magnet.
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 SAIJ40BX700-20S FAQ
At an operating pressure of 0.5 MPa, this 40 mm bore cylinder generates 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N.
The rear adjuster acts as a mechanical stop that lets you shorten the 700 mm nominal stroke by up to 20 mm, creating a 680-700 mm travel window. It is a travel stop for end-position tuning, not a lock, and will not hold the load without live air pressure.
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