Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 400mm 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
- Stroke400 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-20
The AirTAC SAIJ40X400-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that trims the effective travel. With a 400mm nominal stroke and a 20mm adjustment range, it provides a usable travel window of 380-400mm for precise end-position tuning. It delivers 628N of push force and 528N of pull force at 0.5MPa, fitting medium-duty applications. This unit uses a SUS304 stainless steel rod for corrosion resistance and features PT tapered port threads.
The rear adjuster acts as a mechanical stop to fine-tune the retract position without adding external stops. It is not a locking device, so live air is required to hold the load. The extruded aluminum barrel includes sensor grooves on both sides, ready for CMSE reed or DMSE electronic switches if a magnet is added later. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 400 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 SAIJ40BX400-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×400 | 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 SAIJ40BX400-20 Is Used
Machine Changeover
Dial in the 380-400mm travel window during product size transitions without replacing the entire cylinder assembly.
End-Position Tuning
Fine-tune the retract stop during commissioning to perfect positioning accuracy on automated equipment.
Corrosion-Resistant Actuation
The SUS304 stainless steel rod provides reliable performance in environments where moisture or mild chemicals are present.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-20 the Right Cylinder?
Choose this 40mm bore when you need more force than the 32mm version (402N push at 0.5MPa) but want a smaller footprint than the 63mm class. The 20mm adjustable stroke is ideal for machine changeovers, letting you dial in the exact end-stop without swapping the cylinder. Because the 400mm stroke is relatively long, the 16mm rod and M12x1.25 thread still require an external guide to prevent excessive side-loading. For load-holding without air pressure, select the SAIL or BSAI series instead of relying on the adjuster. As a dimensionally interchangeable ISO 15552 cylinder, it matches standard bore, stroke, and port mounting interfaces.
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 SAIJ40BX400-20 FAQ
At 0.5MPa operating pressure, it provides 628N push force and 528N pull force. The operational speed range is 30-800mm/s.
The rear adjuster acts as a mechanical stop that shortens the 400mm nominal stroke by up to 20mm, creating a 380-400mm usable travel window. It only sets the end position and does not lock the load.
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