Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-100
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-100 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 SAIJ40BX185-100
The AirTAC SAIJ40X185-100 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the effective travel back by up to 100 mm. This yields a usable stroke window of 85-185 mm, letting you dial in the exact retract end-position during commissioning without adding external stops. The 16 mm carbon steel piston rod pairs with an M12x1.25 thread, while the barrel is extruded aluminum with sensor grooves on both sides.
This specific configuration uses a SUS304 stainless steel rod for superior corrosion resistance and includes a PT tapered port thread. Operating at a 0.15-1.0 MPa pressure range, it delivers 628 N of push force at 0.5 MPa. The rear adjuster acts purely as a mechanical stop to set the travel end and works alongside the standard variable air cushions at both ends.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-100 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-100 |
|---|---|
| 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 SAIJ40BX185-100
| 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 SAIJ40BX185-100 Is Used
Machine Changeover
Dial in the retract position from 85 to 185 mm on the fly when switching product sizes on a packaging line, avoiding mechanical rebuilds.
End-Position Tuning
Fine-tune the exact stopping point during commissioning to compensate for mechanical tolerances without installing external bumpers.
Corrosive Environments
Leverage the SUS304 stainless steel rod and adjustable stroke for reliable operation in washdown or mildly corrosive industrial settings.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-100 the Right Cylinder?
Choose this 40 mm bore when your application requires 628 N of push force at 0.5 MPa, stepping up from a 32 mm bore (402 N) for higher thrust, or down from a 50 mm bore (982 N) to save space. An adjustable stroke is ideal for product changeovers on a line where the retract distance varies, replacing the need to swap out a fixed-stroke SAI cylinder.
For ISO 15552 replacement matching, ensure you specify the 40 mm bore, 185 mm nominal stroke, 100 mm adjustment range, PT port thread, and the SUS304 (B) rod material. Note that the SAIJ mounting set is limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR options. Because the rear adjuster only stops travel and does not lock the load, use a SAIL or BSAI cylinder if you need position holding without live air pressure.
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 SAIJ40BX185-100 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 a standard speed range of 30-800 mm/s.
A rear external stopper screw lets you shorten the nominal 185 mm stroke by up to 100 mm, creating a usable travel window of 85-185 mm. The adjuster acts as a travel stop, not a load lock, so live air is still required to hold position.
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