This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX1000S, 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 SI50BX1000S
The AirTAC Airtac SI50 Standard Cylinder SI50BX1000S 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 SAI50BX1000S, 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 → SAI50BX1000S
- 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 SI50BX1000S
The AirTAC SI50BX1000S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore, 1000mm stroke, SUS304 stainless rod (-B) and piston magnet (-S). Delivering 982N push force at 0.5MPa via a G1/4 port, it is replaced by the direct replacement SAI50BX1000S. This successor matches the exact ISO 15552 mounting interface, bore, stroke, force and accessories.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also adds SAIL, SAIF and BSAI lock variants the SI lacked. The original -S magnet supports legacy CS1-B/DS1-B sensors, while SAI uses current AirTAC switches.
Airtac SI50 Standard Cylinder SI50BX1000S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX1000S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX1000S |
| 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 SAI50BX1000S 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 SAI50BX1000S 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 SI50BX1000S
| 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 SI50BX1000S Is Used
Long-Stroke Material Transfer
Drives goods across a 1-meter conveyor gap. The SUS304 rod resists moisture, while the external guide handles the extended 1000mm stroke to prevent rod bending.
Vertical Lift Gate Actuation
Use a pilot check valve or SAIL lock variant to hold the gate securely if air pressure drops.
Pneumatic Divertor Mechanism
Shifts a sorting flap 1000mm to reroute packages. The built-in magnet enables CS1-B/DS1-B position sensing to confirm end-of-stroke arrival.
Replacing the Airtac SI50 Standard Cylinder SI50BX1000S with the SAI50BX1000S
To replace this SI50BX1000S, order the SAI50BX1000S. Confirm the ISO 15552 mounting interface, the 50mm bore, 1000mm stroke, G1/4 port (PT/G/NPT thread options) and your mounting accessory (LB, FA, TC, etc.). The -B rod is SUS304 stainless and the -S magnet works with CS1-B/DS1-B switches. For sizing, a 40mm bore yields 628N push at 0.5MPa, while a 63mm bore yields 1559N. Note: a plain cylinder drifts on air loss as cushions only decelerate; use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for load holding. At 1000mm stroke, prevent rod bending by guiding the load externally to minimize side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX1000S
- ✓ 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 SI50BX1000S FAQ
Yes, the SI50BX1000S is discontinued. The direct replacement is the SAI50BX1000S. It shares the identical ISO 15552 mounting interface, 50mm bore, 1000mm stroke, output force, G1/4 port and mounting accessories, fitting directly into existing fixtures.
It has a G1/4 air port. The force ratings are: 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a theoretical max of 200kgf at 1.0MPa. The speed range is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX1000S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX1000S replacement — usually within 7-8 hours.