Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-30S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 125mm 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
- Stroke125 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-30S
The AirTAC SAIJ40X125-30-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 95 to 125 mm, allowing you to dial back the end-of-stroke position by up to 30 mm during commissioning without adding external stops. In the 40 mm bore class, it generates 879 N of push force and 528 N of pull force at 0.7 MPa.
This specific configuration includes a SUS304 stainless steel rod for superior corrosion resistance and a PT tapered port thread. It is equipped with a magnet for position sensing, supporting AirTAC CMSE reed and DMSE electronic solid-state switches mounted in the dual-side sensor grooves. The extruded aluminum barrel design omits tie-rods, and the SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-30S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 125 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 SAIJ40BX125-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×125 | 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 SAIJ40BX125-30S Is Used
Commissioning Fine-Tuning
Dial in the exact end position within a 95-125 mm window during machine setup without swapping cylinders or bolting on external stoppers.
Product Size Changeover
Quickly adapt the retract end-stop on packaging lines when switching between different product sizes, saving valuable changeover time.
Corrosive Assembly Pressing
Apply up to 879 N of push force at 0.7 MPa using the SUS304 stainless steel rod for reliable pressing in environments requiring corrosion resistance.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-30S the Right Cylinder?
Choose this 40 mm bore when your application requires up to 879 N of thrust at 0.7 MPa; step down to a 32 mm bore if you only need 563 N, or up to a 50 mm bore for 1374 N. An adjustable stroke is ideal for machine setups requiring a variable end-stop or fine-tuning during product changeovers, whereas a fixed SAI cylinder is better for rigid, unchanging travel limits. Remember that the rear adjuster acts as a travel stop, not a lock; this plain SAIJ will not hold a load without live air pressure. For drop-in replacement, verify the 125 mm stroke, 30 mm adjustment, G1/4 port, PT thread, and the -S magnet requirement. At 125 mm stroke, side loads are minimal, but always ensure proper guiding for heavy loads.
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 SAIJ40BX125-30S FAQ
At 0.7 MPa operating pressure, this 40 mm bore double-acting cylinder provides 879 N of push force and 528 N of pull force. It can deliver up to 1130 N of push force at 0.9 MPa.
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective stroke from 125 mm down to 95 mm. It is a travel stop for end-position tuning, not a lock, so the cylinder will not hold its load without live air pressure.
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