Airtac SAIJ50 Adjustable Cylinder SAIJ50BX400-20
The AirTAC Airtac SAIJ50 Adjustable Cylinder SAIJ50BX400-20 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 SAIJ50BX400-20
The AirTAC SAIJ50X400-20 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 380-400 mm usable travel window, allowing you to trim the effective stroke by up to 20 mm during commissioning without external stops. Built with an extruded aluminum barrel, it delivers 982 N of push force at 0.5 MPa and operates at speeds between 30-800 mm/s.
This SKU features a SUS304 stainless steel rod for superior corrosion resistance and utilizes PT tapered port threads with a G1/4 connection. The rear adjuster acts purely as a mechanical stop to fine-tune the end position; it does not lock the load, meaning live air is required to maintain position. For load-holding without air pressure, consider the SAIL or BSAI series.
Airtac SAIJ50 Adjustable Cylinder SAIJ50BX400-20 Technical Specifications
| Model | Airtac SAIJ50 Adjustable Cylinder SAIJ50BX400-20 |
|---|---|
| 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 SAIJ50BX400-20
| 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 SAIJ50BX400-20 Is Used
Product Changeovers
Quickly dial in the 380-400 mm end-stop during format size changes on a packaging line without replacing the cylinder or adding shims.
Variable End Stops
Fine-tune the retraction point on a diverter arm to accommodate different package lengths on the fly.
Machine Setup
Trim the rear travel by up to 20 mm during commissioning to perfectly time a press operation without mechanical rework.
Is the Airtac SAIJ50 Adjustable Cylinder SAIJ50BX400-20 the Right Cylinder?
Choose this 50 mm bore when an application requires roughly 982 N of push force at 0.5 MPa, stepping up from a 40 mm bore that provides 628 N. The adjustable stroke is ideal for product changeovers on a line, letting you dial in the exact 380-400 mm end-stop without swapping the cylinder. When replacing an ISO 15552 cylinder, match the 50 mm bore, 400 mm stroke, PT port, and mounting style.
Because this model has a 400 mm stroke, the 20 mm rod diameter and M16x1.5 rod thread will experience leverage forces if the load is unsupported. An external guide mechanism is recommended to prevent excessive side-loading and premature seal wear. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting FB, CA, CB, and CR.
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 SAIJ50BX400-20 FAQ
At 0.5 MPa operating pressure, 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 20 mm, providing a usable travel window of 380-400 mm. It functions as a mechanical stop and does not hold 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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