Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-30S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 300mm 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
- Stroke300 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-30S
The AirTAC SAIJ40X300-30-S is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 270-300 mm usable travel window, allowing you to dial back the 300 mm nominal stroke by up to 30 mm during commissioning. Delivering 628 N of push force at 0.5 MPa, it is built with a SUS304 stainless steel rod for superior corrosion resistance and includes a magnet for CMSE or DMSE sensors.
This model uses a PT tapered port (G1/4) and offers variable air cushions at both ends to manage impact deceleration. The rear adjuster acts strictly as a mechanical stop to fine-tune the retract position without adding external stops; it is not a locking device and cannot hold a load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-30S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 300 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 SAIJ40BX300-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×300 | 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 SAIJ40BX300-30S Is Used
Machine Changeover
Dial in the exact retract distance within the 270-300 mm window when switching between product sizes on a shared fixture.
End-Stop Calibration
Fine-tune the final resting position during commissioning without swapping out the entire cylinder or adding external mechanical stops.
Variable Diverter
Adjust the stroke length on a sorting diverter arm to accommodate different package widths on the fly.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-30S the Right Cylinder?
Choose this adjustable-stroke model when you need on-the-fly end-position tuning for product changeovers rather than a fixed-stroke SAI cylinder. If your application requires less force, the 32 mm bore offers 402 N at 0.5 MPa; if you need higher thrust, stepping up to the 50 mm bore yields 982 N. For load-holding without continuous air pressure, consider the SAIL or BSAI series instead of relying on the adjuster.
Because the 300 mm stroke is relatively long, the 16 mm rod and M12x1.25 thread can only handle limited side loads; an external guide rail is recommended for unsupported loads. This SAIJ configuration uses the reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and omits FB, CA, CB, and CR brackets.
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 SAIJ40BX300-30S FAQ
At 0.5 MPa, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At the maximum operating pressure of 1.0 MPa, it delivers up to 128 kgf.
The rear adjuster screw lets you shorten the 300 mm nominal stroke by up to 30 mm, providing a usable travel window of 270-300 mm. It functions as a mechanical stop for end-position tuning, not as a load-holding lock.
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