Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-40
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 185mm 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
- Stroke185 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-40
The AirTAC SAIJ40X185-40 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 185 mm stroke that can be dialed back by up to 40 mm, yielding a precise 145-185 mm usable travel window for commissioning flexibility. Delivering 628 N of push force at 0.5 MPa, it bridges the gap between compact 32 mm bores and heavier 50 mm units.
This configuration features a SUS304 stainless steel rod for superior corrosion resistance and utilizes PT tapered port threads with a G1/4 connection. The extruded aluminum barrel includes sensor grooves on both sides, allowing you to drop in CMSE or DMSE switches if a magnet is added later.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-40 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 185 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 SAIJ40BX185-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×185 | 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 SAIJ40BX185-40 Is Used
Machine Changeover
Dial in the 145-185 mm travel window during product size changes to set new retract endpoints without swapping hardware.
End-Position Tuning
Fine-tune the final retract position at commissioning to absorb mechanical tolerances and achieve exact placement.
Assembly Line Stops
Provide a variable physical stop for varying part sizes on a conveyor without repositioning the cylinder mount.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-40 the Right Cylinder?
Select this 40 mm bore when an application demands 628 N push force at 0.5 MPa but does not warrant the 982 N capacity of a 50 mm unit. The adjustable stroke is chosen over a fixed SAI cylinder when you need to fine-tune the retract end position during product changeovers without adding external stops. For exact ISO 15552 replacement matching, verify the 185 mm stroke, 40 mm adjustment range, PT port thread, and required mounting style.
Since the stroke is under 300 mm, side-load stress is moderate, but always guide the load to prevent rod binding. Remember that the rear adjuster acts only as a travel stop and does not hold the load without live air; for fail-safe load holding, consider an external rod lock or a SAIL pneumatic lock cylinder.
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 SAIJ40BX185-40 FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At a maximum 0.9 MPa, the push force increases to 1130 N.
The rear adjuster screw allows you to shorten the effective stroke by up to 40 mm. This creates a 145-185 mm adjustable travel window, letting you set the exact retract end position without changing the cylinder.
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