Airtac SAIJ50 Adjustable Cylinder SAIJ50BX400-40
The AirTAC Airtac SAIJ50 Adjustable Cylinder SAIJ50BX400-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø50mm 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.
- BoreØ50 mm
- Stroke400 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- CushionAdjustable, 30 mm
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAIJ50 Adjustable Cylinder SAIJ50BX400-40
The AirTAC SAIJ50X400-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel within a 360-400 mm window. Delivering 982 N of push force at 0.5 MPa, it is built with a SUS304 stainless steel rod for superior corrosion resistance and uses PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement.
Because the rear screw acts as a travel stop rather than a lock, the cylinder requires live air to maintain its position during operation. You can fine-tune the end position at commissioning without swapping the cylinder or bolting on external stops. The standard air cushion at both ends handles deceleration, while the 20 mm rod thread provides robust mounting for moderate side loads.
Airtac SAIJ50 Adjustable Cylinder SAIJ50BX400-40 Technical Specifications
| Model | Airtac SAIJ50 Adjustable Cylinder SAIJ50BX400-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø50 mm |
| Stroke | 400 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| 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 (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ50 Adjustable Cylinder SAIJ50BX400-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 50 | 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 SAIJ50 Adjustable Cylinder SAIJ50BX400-40 Is Used
Product Size Changeover
Dial in the 360-400 mm travel window during line changeovers to accommodate different product lengths without replacing the actuator.
End-Position Calibration
Fine-tune the retract stop during machine commissioning to achieve exact positioning without adding external mechanical stops.
Variable Stop Diverter
Adjust the stroke on the fly for sorting or diverting items of varying dimensions on a conveyor system.
Is the Airtac SAIJ50 Adjustable Cylinder SAIJ50BX400-40 the Right Cylinder?
Choose this 50 mm bore when you need 982 N push force at 0.5 MPa, stepping up from a 40 mm bore (628 N) or down from a 63 mm bore (1559 N). An adjustable stroke is ideal for machine setups requiring variable end-stops or product-size changeovers, giving you precise control that a fixed-stroke SAI cylinder cannot provide. For a direct ISO 15552 replacement match, verify the 400 mm stroke, 40 mm adjustment, PT port threads, and required mounting style.
With a 400 mm stroke, the unsupported rod extension increases the risk of side-loading; ensure you use an external guide to prevent premature seal wear. Remember that the rear adjuster only sets the travel end and does not hold the load without continuous air pressure. If your application requires true load-holding without live air, consider an AirTAC SAIL or BSAI cylinder instead. This model supports a speed range of 30-800 mm/s.
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 SAIJ50 Adjustable Cylinder SAIJ50BX400-40 FAQ
At 0.5 MPa, this 50 mm bore cylinder provides 982 N of push force and 825 N of pull force. At 0.7 MPa, the push force increases to 1374 N.
The rear adjuster screw allows you to shorten the 400 mm nominal stroke by up to 40 mm, providing a usable travel window of 360-400 mm. It functions as a mechanical stop and does not lock the load without live air pressure.
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Covers non-human-caused product damage.
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Standard models are processed and dispatched in 3-5 business days.
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