Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-40S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-40S 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 SAIJ40BX400-40S
The AirTAC SAIJ40X400-40-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 628N of push force at 0.5 MPa and features a 400mm nominal stroke that can be fine-tuned down by up to 40mm, giving you a precise 360-400mm usable travel window during commissioning. This adjuster acts purely as a mechanical stop for end-position tuning and does not hold the load without live air pressure.
Built with a SUS304 stainless steel rod and a PT tapered port, this 40mm bore unit integrates seamlessly into existing setups. The extruded aluminum barrel includes sensor grooves on both sides, and because this SKU includes a magnet (-S), it directly supports AirTAC CMSE reed and DMSE electronic solid-state switches for exact position feedback.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-40S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-40S |
|---|---|
| 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 SAIJ40BX400-40S
| 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 SAIJ40BX400-40S Is Used
Product Changeover
Dial in the 360-400mm travel window during format size changes on packaging lines without adding external mechanical stops.
End-Position Tuning
Fine-tune the retract end-of-stroke at machine commissioning to perfect the resting position of critical actuators.
Variable End Stops
Adjust the stroke on the fly for diverter gates that must handle varying package lengths on a single conveyor.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-40S the Right Cylinder?
Select this 40mm bore cylinder when an application requires 628N push or 528N pull force at 0.5 MPa, but demands final end-position tuning without swapping hardware. If your setup needs less force, step down to the 32mm bore (402N push); if you require significantly more thrust, step up to the 50mm bore (982N push). Choose this adjustable-stroke SAIJ model over a fixed SAI when you anticipate product changeovers or need to dial in a precise 360-400mm stroke window on the machine.
Because the nominal stroke is 400mm, the M12x1.25 rod should be adequately supported by an external guide to prevent excessive side-loading and premature seal wear. For dimensionally interchangeable per ISO 15552 mounting-interface replacements, match the 40mm bore, 400mm stroke, 40mm adjustment, PT port, and -S magnet. Remember that the rear adjuster is a travel stop, not a lock; for load-holding without live air pressure, consider an AirTAC SAIL or BSAI cylinder. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ40BX400-40S FAQ
At 0.5 MPa operating pressure, this 40mm bore cylinder provides 628N of push force and 528N of pull force. It can reach up to 1130N push force at 0.9 MPa.
The rear adjuster screw allows you to shorten the 400mm nominal stroke by up to 40mm, creating a 360-400mm usable travel window. It acts as a mechanical stop to fine-tune the end position and does not lock the load without continuous air pressure.
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