Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-50S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-50S 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 SAIJ40BX185-50S
The AirTAC SAIJ40X185-50-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the 185 mm nominal stroke by up to 50 mm for a usable travel window of 135-185 mm. It delivers 628 N of push force and 528 N of pull force at 0.5 MPa. Featuring a SUS304 stainless steel rod and a PT tapered port, it is built for demanding environments.
This adjustable model lets you fine-tune the retract end position at commissioning without swapping the cylinder or adding external stops. The rear adjuster acts purely as a travel stop and works alongside the standard air cushions to decelerate the load; it does not hold the load without live air. For load-holding without pressure, consider the SAIL or BSAI series. An -S magnet is included for use with CMSE reed and DMSE electronic sensors.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-50S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-50S |
|---|---|
| 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 SAIJ40BX185-50S
| 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 SAIJ40BX185-50S Is Used
Product Changeovers
Quickly adjust the retract distance by up to 50 mm when switching product sizes on a packaging line, avoiding mechanical rebuilds.
End-Stop Calibration
Fine-tune the exact end position during machine commissioning to perfect pick-and-place alignment without external shims.
Sensor-Ready Positioning
Leverage the built-in magnet with DMSE electronic sensors to confirm the adjusted end position in automated assembly routines.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-50S the Right Cylinder?
Choose this 40 mm bore when an application requires precise end-position tuning across a 135-185 mm travel window. If you need more force, stepping up to the 50 mm bore yields 982 N push force at 0.5 MPa; stepping down to the 32 mm bore provides 402 N. The adjustable stroke is ideal for product changeovers on a line, whereas a fixed SAI cylinder suits static end stops. This SKU uses a SUS304 rod for corrosion resistance and PT tapered ports. Mounting options are limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. Because the stroke is under 300 mm, side-load stress is manageable, but external guides are still recommended for heavy lateral loads.
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 SAIJ40BX185-50S 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 0.7 MPa, the push force increases to 879 N.
The rear adjuster screw allows you to shorten the 185 mm nominal stroke by up to 50 mm, creating a usable travel window of 135-185 mm. The adjuster is a mechanical stop that sets the end position and does not lock the load without live air pressure.
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