Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-50
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-50 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 SAIJ40BX185-50
The AirTAC SAIJ40X185-50 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to trim the effective travel down by up to 50 mm. This yields a precise usable stroke window of 135 to 185 mm, enabling fine end-position tuning at commissioning without swapping the cylinder or adding external stops. It delivers 879 N of push force at 0.7 MPa and features a SUS304 stainless steel rod for superior corrosion resistance.
This extruded aluminum profile cylinder includes sensor grooves on both sides, though a magnet is not specified for this configuration. The rod end thread is M12x1.25, and the pneumatic supply connects via a PT G1/4 port. The rear screw acts purely as a travel stop for deceleration setup and does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-50 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-50 |
|---|---|
| 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 SAIJ40BX185-50
| 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 SAIJ40BX185-50 Is Used
Product Changeover
Quickly dial in the 135-185 mm stroke window during format changes on a packaging line, using the rear adjuster instead of swapping hard stops.
End-Position Tuning
Fine-tune the exact retract position during machine commissioning to perfect part seating without replacing the entire cylinder.
Variable Stops
Provide an adjustable physical stop for diverter arms on a conveyor, allowing operators to modify the travel end based on package size.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-50 the Right Cylinder?
Choose this 40 mm bore when you need 879 N of push force at 0.7 MPa, stepping up from a 32 mm bore (563 N) for heavier fixtures, or dropping down from a 50 mm bore (1374 N) to save space and air volume. The 50 mm adjustment range is ideal for product-size changeovers on a line, allowing you to dial in the exact 135 to 185 mm end-stop without machining new hard stops. For load-holding without live pressure, you must use an external rod lock or pilot-operated check valve, as the SAIJ adjuster is not a brake.
To match this ISO 15552 replacement cylinder exactly, verify the 40 mm bore, 185 mm nominal stroke, 50 mm adjustment code, PT G1/4 port, and SUS304 (B) rod material. Since the nominal stroke is 185 mm, side loads are minimal, but ensure the M12x1.25 rod thread is aligned to avoid binding. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting FB, CA, CB, and CR.
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 SAIJ40BX185-50 FAQ
At 0.5 MPa, it provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N, and at 0.9 MPa it reaches 1130 N.
The rear adjuster screw lets you shorten the 185 mm nominal stroke by up to 50 mm, creating a usable travel window of 135 to 185 mm. This stopper sets the travel end for deceleration but does not lock the load without live air.
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