This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX1000, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SI50 Standard Cylinder SI50BX1000
The AirTAC Airtac SI50 Standard Cylinder SI50BX1000 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 1000mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50BX1000, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke1000 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50BX1000
- 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 SI50 Standard Cylinder SI50BX1000
The AirTAC SI50BX1000 is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore, 1000 mm stroke, and a SUS304 stainless steel rod. It delivers 982 N push force at 0.5 MPa. Because this legacy unit is end-of-life, you should order the direct replacement: the SAI50BX1000. It shares the same ISO 15552 mounting interface, bore, stroke, output force, G1/4 port, and accessories, fitting directly into existing fixtures.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. This SI50BX1000 variant lacks a magnet (-S) and cannot accept a position sensor.
Airtac SI50 Standard Cylinder SI50BX1000 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX1000 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX1000 |
| Bore size | Ø50 mm |
| Stroke | 1000 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 standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI50BX1000 carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / 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 | |
The SAI50BX1000 produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI50 Standard Cylinder SI50BX1000
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×1000 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SI50 Standard Cylinder SI50BX1000 Is Used
Long-Stroke Diversion
Executes 1000 mm routing strokes on packaging conveyors, using the SUS304 rod for washdown durability.
Actuator Extension
Deploys large machine guards or doors across a wide 1000 mm span, relying on external guides to prevent rod bending.
Replacing the Airtac SI50 Standard Cylinder SI50BX1000 with the SAI50BX1000
To replace the discontinued SI50BX1000, order the SAI50BX1000. Confirm the ISO 15552 mounting interface, 50 mm bore, 1000 mm stroke, G1/4 port, and M16x1.5 rod thread. This SKU has no magnet, so it cannot support legacy CS1-B/DS1-B switches; if sensing is needed, select an SAI50X1000S and current AirTAC switches. Because the 1000 mm stroke is long, use external guides to prevent rod bending and side-load damage. If you need more force, the 63 mm bore offers 1559 N push at 0.5 MPa; if less is acceptable, the 40 mm bore provides 628 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX1000
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI50 Standard Cylinder SI50BX1000 FAQ
Yes, the SI50BX1000 is discontinued. The direct replacement is the SAI50BX1000. It is dimensionally interchangeable per ISO 15552, retaining the same 50 mm bore, 1000 mm stroke, force, G1/4 port, and mounting interface.
The bore has a G1/4 air port. Force ratings are: 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, 1767 N push at 0.9 MPa, and a theoretical maximum of 200 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX1000
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX1000 replacement — usually within 7-8 hours.