Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-75S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-75S 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 SAIJ40BX185-75S
The AirTAC SAIJ40X185-75-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It features a 185 mm nominal stroke that can be dialed back by up to 75 mm, yielding a usable travel window of 110-185 mm. This allows precise end-position tuning at commissioning without swapping the cylinder or adding external stops. In the 40 mm bore class, it delivers 628 N of push force and 528 N of pull force at 0.5 MPa.
This variant includes a SUS304 stainless steel rod (code B) for superior corrosion resistance and uses PT tapered port threads with a G1/4 connection. The extruded aluminum barrel integrates sensor grooves on both sides, and because this SKU includes a magnet (-S), it supports AirTAC CMSE reed and DMSE electronic solid-state switches. The rear adjuster acts strictly as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-75S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-75S |
|---|---|
| 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 SAIJ40BX185-75S
| 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 SAIJ40BX185-75S Is Used
Machine Changeover
Dial in the 110-185 mm travel window during format changes, allowing rapid product size adjustments on packaging lines without replacing the actuator.
Variable End-Stop Setup
Use the rear adjusting screw to fine-tune the retract position at commissioning, perfect for dialing in exact sensor triggers and seating depths.
Corrosion-Resistant Positioning
Leverage the SUS304 stainless steel rod for precise clamping or pushing tasks in light manufacturing where moisture or minor corrosive elements are present.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-75S the Right Cylinder?
Choose this 40 mm bore cylinder when an application requires fine-tuning the retract end-position across a 110-185 mm window during product changeovers. If your setup needs less force, stepping down to a 32 mm bore yields 402 N of push force at 0.5 MPa; stepping up to a 50 mm bore provides 982 N. An adjustable stroke is preferred over a fixed SAI cylinder when machine setups demand variable end-stops without mechanical rework.
Because the nominal stroke is 185 mm, side-load risks are moderate, but always ensure external guiding for the load. Remember that neither the rear adjuster nor the adjustable air cushions function as a lock; for load-holding without live air, select an AirTAC SAIL or BSAI cylinder. To match this ISO 15552 dimensionally interchangeable cylinder, specify: 40 mm bore, 185 mm stroke, 75 mm adjustment, PT ports, Basic/FA/LB/TC/FTC/TCM1/TCM2 mountings, and a -S magnet.
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 SAIJ40BX185-75S 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 allows you to shorten the 185 mm nominal stroke by up to 75 mm, creating an effective travel window of 110-185 mm. The adjuster acts as a mechanical stop and does not lock the load without continuous air pressure.
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