Airtac SAIJ50 Adjustable Cylinder SAIJ50BX400-20S
The AirTAC Airtac SAIJ50 Adjustable Cylinder SAIJ50BX400-20S 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 SAIJ50BX400-20S
The AirTAC SAIJ50X400-20-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the end position without adding external stops. It provides a usable travel window of 380 to 400 mm, enabling precise machine setup directly at commissioning. Equipped with a 20 mm diameter piston rod and M16x1.5 rod thread, it delivers 982 N of push force at 0.5 MPa and 1374 N at 0.7 MPa.
This variant includes a SUS304 stainless steel rod for corrosion resistance and a built-in magnet for position sensing. The extruded aluminum barrel features sensor grooves on both sides, supporting AirTAC CMSE reed and DMSE electronic solid-state switches. It uses PT tapered ports sized G1/4, operates at speeds from 30 to 800 mm/s, and includes adjustable air cushions at both ends to manage deceleration.
Airtac SAIJ50 Adjustable Cylinder SAIJ50BX400-20S Technical Specifications
| Model | Airtac SAIJ50 Adjustable Cylinder SAIJ50BX400-20S |
|---|---|
| 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 SAIJ50BX400-20S
| 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 SAIJ50BX400-20S Is Used
Variable End-Stop Setup
Dial in the exact retract position within the 380 to 400 mm window during machine commissioning without swapping out the entire cylinder.
Product Size Changeover
Quickly adapt the stroke end position on a packaging line when processing different product lengths, using the rear screw for fine adjustments.
Long-Stroke Positioning
Leverage the 400 mm travel with a 20 mm adjustment buffer to precisely set tooling endpoints on extended-stroke assembly machinery.
Is the Airtac SAIJ50 Adjustable Cylinder SAIJ50BX400-20S the Right Cylinder?
Choose this 50 mm bore when an application requires around 982 N of push force at 0.5 MPa, stepping up from a 40 mm bore that provides 628 N, or down from a 63 mm bore yielding 1559 N. The adjustable stroke is ideal for product changeovers on a line where the exact end-of-stroke varies by up to 20 mm, replacing fixed-stroke SAI cylinders when external stoppers are impractical. Because the nominal stroke is 400 mm, an external guide is recommended to prevent excessive side loading on the long unsupported rod.
The rear adjuster acts solely as a travel stop to set the retract position and does not hold the load without live air pressure. For fail-safe load holding, select the SAIL air-released lock or BSAI clamp-lock series instead. This SAIJ model is dimensionally interchangeable per ISO 15552 and supports a mounting set including 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 SAIJ50 Adjustable Cylinder SAIJ50BX400-20S FAQ
At 0.5 MPa it 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 acts as a mechanical stop, allowing you to shorten the nominal 400 mm stroke by up to 20 mm, which creates a usable travel window of 380 to 400 mm. It is a travel stop, not a lock, and does not hold the load without live air.
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