Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-10
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-10 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 SAIJ40BX185-10
The AirTAC SAIJ40X185-10 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel within a 175-185 mm window. Delivering 628 N of push force at 0.5 MPa, it is built with a SUS304 stainless steel rod for superior corrosion resistance and a PT tapered port thread for a reliable seal.
Because the adjuster acts purely as a mechanical stop at the retract end, it decelerates the piston alongside the standard air cushions but does not lock the load without live air. The extruded aluminum barrel includes sensor grooves on both sides, ready for CMSE or DMSE switches if you add a magnet later, and the mounting set covers Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-10 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-10 |
|---|---|
| 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 SAIJ40BX185-10
| 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 SAIJ40BX185-10 Is Used
Machine Changeovers
Dial in the 175-185 mm travel window during product size transitions to set precise retract positions without repositioning the entire fixture.
End-Position Tuning
Use the 10 mm rear stopper to fine-tune the final retract point at commissioning, compensating for mechanical tolerance stack-ups in the assembly.
Corrosive Assembly Lines
Leverage the SUS304 stainless steel rod in light manufacturing environments where moisture or minor chemical exposure would degrade standard carbon steel.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-10 the Right Cylinder?
Choose this 40 mm bore when you need more thrust than the 32 mm version (402 N at 0.5 MPa) but want to avoid the larger footprint of a 50 mm cylinder. The 10 mm rear adjustment screw is ideal for product changeovers, letting you dial in the exact end position without swapping cylinders or adding external stops. For load-holding without continuous air pressure, consider the SAIL or BSAI series instead, as the SAIJ adjuster is not a brake.
When replacing an ISO 15552 cylinder, match the 40 mm bore, 185 mm stroke, PT ports, and the specific 10 mm adjustment range. Since the 185 mm stroke is under the 300 mm threshold, side-load concerns are minimal, but always ensure the 16 mm rod and M12x1.25 thread are properly aligned to prevent premature seal wear.
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 SAIJ40BX185-10 FAQ
At 0.5 MPa, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. It operates at speeds between 30 and 800 mm/s.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the nominal 185 mm stroke by up to 10 mm, creating a 175-185 mm usable travel window. It sets the end position but does not hold the load without live air pressure.
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