Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-30S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 50mm 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
- Stroke50 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-30S
The AirTAC SAIJ40X50-30-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 628 N of push force at 0.5 MPa and features a 50 mm nominal stroke that can be fine-tuned down by up to 30 mm, creating a precise 20-50 mm usable travel window. This built-in adjustability allows you to dial in the exact end position during commissioning without adding external stops.
This specific configuration includes a SUS304 stainless steel rod (code B) for superior corrosion resistance and a magnet (-S) for position sensing. The extruded aluminum barrel includes sensor grooves on both sides, supporting AirTAC CMSE reed and DMSE electronic solid-state switches. It uses a PT tapered G1/4 port and offers adjustable air cushions at both ends to decelerate the load smoothly.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-30S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 50 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 SAIJ40BX50-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×50 | 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 SAIJ40BX50-30S Is Used
Machine Setup & Changeover
Fine-tune the 20-50 mm travel window during product changeovers to accommodate different part sizes without physically swapping the cylinder.
Variable End-Stop Positioning
Dial in the exact retract position during commissioning using the rear stopper, ensuring precise placement without external mechanical stops.
Corrosive Environment Actuation
Leverage the SUS304 stainless steel rod for light-duty pushing and pulling tasks in environments where standard carbon steel rods would corrode.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-30S the Right Cylinder?
Choose this 40 mm bore cylinder when an application requires a variable end-stop within a compact 20-50 mm travel window. If you need less force, stepping down to a 32 mm bore yields 402 N at 0.5 MPa, while stepping up to a 50 mm bore provides 982 N. An adjustable stroke is ideal for product-size changeovers on a line, whereas a fixed-stroke SAI is sufficient for repetitive single-purpose tasks.
When specifying a replacement, match the 40 mm bore, 50 mm stroke, 30 mm adjustment range, PT port, and -S magnet. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. Remember that the rear adjuster acts only as a travel stop to set deceleration; it does not hold the load without live air. For true load-holding without pressure, use an external rod lock or a SAIL/BSAI cylinder.
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 SAIJ40BX50-30S FAQ
At 0.5 MPa, 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 lets you trim the 50 mm nominal stroke back by up to 30 mm, providing a usable travel window of 20-50 mm. It acts as a mechanical stop to set the end position and does not lock the load without live air pressure.
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