Airtac SAIJ40 Adjustable Cylinder SAIJ40BX375-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX375-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 375mm 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
- Stroke375 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX375-20S
The AirTAC SAIJ40X375-20-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that trims the effective travel, creating a usable window of 355-375mm for precise end-position tuning. It delivers 879N of push force and 738N of pull force at 0.7MPa, making it well-suited for moderate-thrust actuation. Equipped with a SUS304 stainless steel rod, it provides enhanced corrosion resistance for demanding environments.
This model includes a magnetic piston for position sensing, working seamlessly with AirTAC CMSE reed and DMSE electronic switches housed in the dual-side sensor grooves. It uses PT tapered G1/4 ports and relies on a 16mm rod with an M12x1.25 thread. The rear adjustment mechanism acts strictly as a mechanical stop to fine-tune the retract position without swapping cylinders, but it does not function as a lock or brake to hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX375-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX375-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 375 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 SAIJ40BX375-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×375 | 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 SAIJ40BX375-20S Is Used
Variable End-Stop Tuning
Dial in the exact retract distance within the 355-375mm window during machine commissioning without replacing the entire cylinder or adding external shims.
Product Size Changeover
Quickly adapt automated lines to new product lengths by turning the rear screw to shift the end-position, minimizing downtime between production runs.
Corrosive Environment Actuation
Leverage the SUS304 stainless steel rod for reliable thrust in washdown or mildly corrosive settings where standard carbon steel rods would degrade.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX375-20S the Right Cylinder?
Choose this 40mm bore when a 32mm bore (563N push at 0.5MPa) lacks sufficient thrust, but a 63mm bore (2182N push at 0.5MPa) is physically oversized. The adjustable stroke is ideal for machine setups requiring variable end-stops or product-size changeovers, eliminating the need to bolt on external stops. For load-holding without continuous air pressure, this cylinder is insufficient; the rear adjuster only sets the travel end, so you should explore an AirTAC SAIL pneumatic lock, BSAI clamp-lock, or an external pilot-operated check valve.
Because the 375mm stroke is relatively long, the 16mm rod will experience greater deflection under high side loads; an external guide rail is recommended to prevent premature seal wear. To replace an ISO 15552 cylinder, match the 40mm bore, 375mm stroke, 20mm adjustment, PT G1/4 port, and the -S magnet option. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR brackets.
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 SAIJ40BX375-20S FAQ
At 0.7MPa it provides 879N of push force and 738N of pull force. The operational speed range is 30-800mm/s, driven by filtered air through its G1/4 PT ports.
The rear adjuster acts as a mechanical stop that shortens the 375mm nominal stroke by up to 20mm, yielding a 355-375mm travel window. It only sets the end position and does not lock the load without live air pressure.
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