Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-50S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-50S 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 SAIJ40BX400-50S
The AirTAC SAIJ40X400-50-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It delivers 628 Newtons of push force at 0.5 MPa and provides a usable travel window of 350 to 400 mm, letting you dial back the nominal stroke by up to 50 mm during commissioning. This cylinder includes a SUS304 stainless steel rod and a PT tapered port.
Because the 400 mm stroke is relatively long for a 40 mm bore, an external guide is recommended to manage side loads. The extruded aluminum barrel includes sensor grooves on both sides, and the integrated -S magnet works directly with AirTAC CMSE reed and DMSE electronic sensors. The rear adjuster acts purely as a travel stop to fine-tune end positions without adding external stops.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-50S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-50S |
|---|---|
| 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 SAIJ40BX400-50S
| 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 SAIJ40BX400-50S Is Used
Variable End-Stop Tuning
Dial in the exact 350 to 400 mm travel distance during machine commissioning to accommodate varying material thicknesses without adding external physical stops.
Product Size Changeover
Quickly adjust the retract end-position on a packaging line when switching between different product sizes, minimizing downtime and avoiding cylinder swaps.
Long-Stroke Assembly
Leverage the 400 mm stroke for extended reach operations while using the 50 mm adjustment window to softly limit travel and prevent over-travel.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-50S the Right Cylinder?
Choose this adjustable-stroke model when you need precise end-position tuning during product changeovers without swapping the cylinder. If your application requires less force, stepping down to a 32 mm bore yields 402 N of push force at 0.5 MPa. If you need more power, a 50 mm bore provides 982 N.
The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. Remember that the rear adjuster is a stop, not a lock; the SAIJ cannot hold a load without live air. For load-holding without pressure, select an SAIL or BSAI cylinder. To replace an ISO 15552 cylinder, match the 40 mm bore, 400 mm stroke, 50 mm adjustment, PT port, and -S magnet.
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 SAIJ40BX400-50S FAQ
The rear adjuster screw lets you shorten the effective travel from the nominal 400 mm down to 350 mm. This creates a 50 mm adjustable window, allowing you to fine-tune the end position at commissioning. The adjuster acts as a mechanical stop and does not lock the load without live air pressure.
The SAIJ40X400-50-S generates 628 Newtons of push force and 528 Newtons of pull force at 0.5 MPa. At the maximum operating pressure of 1.0 MPa, it delivers up to 128 kgf of thrust.
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