Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-20S 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 SAIJ40BX300-20S
The AirTAC SAIJ40X300-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 280 to 300 mm. Delivering 628 N of push force at 0.5 MPa, it features a robust 16 mm SUS304 stainless steel rod and PT tapered port threading. The extruded aluminum barrel includes sensor grooves on both sides, and the integrated -S magnet pairs directly with AirTAC CMSE reed and DMSE electronic solid-state switches for precise end-position detection.
This adjustable-stroke design lets you fine-tune the retract end-position at commissioning without swapping the cylinder or bolting on external stops. Because the stroke is 300 mm, the 16 mm rod will carry side loads better than a smaller bore, but an external guide is still recommended for unsupported lengths to prevent binding. The rear adjuster acts purely as a travel stop and deceleration setter, so it does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-20S |
|---|---|
| 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 SAIJ40BX300-20S
| 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 SAIJ40BX300-20S Is Used
Product Changeover
Dial in the 280-300 mm travel window during format changes without disassembling tooling or adding external mechanical stops.
End-Position Tuning
Fine-tune the retract stroke at commissioning to absorb mechanical tolerances and hit exact positioning targets.
Long-Stroke Transfer
Move parts across a 300 mm stroke path while using the rear adjuster to shorten travel slightly for varied part sizes.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-20S the Right Cylinder?
Choose this SAIJ40X300-20-S when your machine setup requires variable end-stops or product-size changeovers on a 300 mm stroke line. If you need less force, stepping down to a 32 mm bore yields 402 N of push force at 0.5 MPa. If your application requires higher thrust, stepping up to a 50 mm bore provides 982 N. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR brackets. For load-holding without live pressure, select the SAIL or BSAI series instead, as the SAIJ adjuster is not a lock.
This model is dimensionally interchangeable per ISO 15552. Configuration details include a 40 mm bore, 300 mm nominal stroke, up to 20 mm adjustment, PT ports, and a -S magnet. The variable air cushions at both ends work alongside the rear mechanical stopper to absorb kinetic energy across the 30 to 800 mm/s speed range.
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 SAIJ40BX300-20S 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 the maximum 1.0 MPa pressure, it can deliver up to 128 kgf.
The rear external screw acts as a stopper that lets you shorten the effective travel from the 300 mm nominal stroke down to 280 mm. This allows you to fine-tune the end position during setup without replacing the cylinder or adding external stops.
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