Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-20S 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 SAIJ40BX185-20S
The AirTAC SAIJ40X185-20-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the travel window down to 165-185 mm without adding external stops. It delivers a robust 628 N push force at 0.5 MPa, making it well-suited for moderate-thrust industrial tasks. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting.
This specific SKU ships with a SUS304 stainless steel rod (option B) for superior corrosion resistance and includes a built-in magnet (-S) for position sensing. It is fully compatible with AirTAC CMSE reed switches and DMSE solid-state sensors. The rear adjuster acts purely as a mechanical stop to set the end position; it does not lock the load, so live air pressure must be maintained to hold position.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-20S |
|---|---|
| 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 SAIJ40BX185-20S
| 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 SAIJ40BX185-20S Is Used
Machine Changeover
Dial in the 165-185 mm travel window on the fly to accommodate new product sizes without physically swapping out the cylinder or adding external mechanical stops.
End-Position Tuning
Use the rear adjusting screw during initial commissioning to perfectly set the retraction point, compensating for mechanical tolerances in the fixture.
Corrosive Environments
The SUS304 stainless steel rod option B provides excellent resistance to moisture and harsh washdown environments while delivering reliable 628 N thrust.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-20S the Right Cylinder?
Choose this 40 mm bore when your application requires precise end-position tuning during commissioning or product changeovers, stepping up from a 32 mm bore (402 N push at 0.5 MPa) for higher thrust demands. The adjustable stroke is ideal when a fixed-stroke SAI cylinder cannot accommodate slight variations in end-stop requirements.
For ISO 15552 interchangeability, match the 40 mm bore, 185 mm stroke, 20 mm adjustment, PT tapered port threads, and the -S magnet. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting FB, CA, CB, and CR. If your machine requires true load-holding without continuous air pressure, consider the SAIL (air-released lock) or BSAI (clamp-lock) cylinders instead of relying on the rear stopper.
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 SAIJ40BX185-20S FAQ
The rear adjusting screw acts as a mechanical stopper, allowing you to shorten the effective stroke by up to 20 mm. This creates a usable travel window of 165-185 mm, letting you fine-tune the end position without replacing the cylinder.
At an operating pressure of 0.5 MPa, the SAIJ40X185-20-S provides a push force of 628 N and a pull force of 528 N. At the maximum pressure of 1.0 MPa, it can deliver up to 128 kgf.
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