This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX950S, 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 SI50BX950S
The AirTAC Airtac SI50 Standard Cylinder SI50BX950S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 950mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50BX950S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke950 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50BX950S
- 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 SI50BX950S
The AirTAC SI50BX950S is a discontinued double-acting ISO 15552 profile cylinder featuring a SUS304 stainless piston rod, a built-in magnet for CS1-B/DS1-B switches, and a 950 mm stroke. Delivering 982 N push force at 0.5 MPa through a G1/4 port, it is replaced by the SAI50BX950S. This direct SAI upgrade retains the exact ISO 15552 mounting interface, bore, and stroke, while introducing an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life.
The SAI family also introduces the SAIL air-released lock, SAIF built-in valve, and BSAI clamp-lock variants that the legacy SI line lacked. Note that a plain cylinder drifts on air loss; the cushion only decelerates, so use an external rod lock or pilot check valve for load holding.
Airtac SI50 Standard Cylinder SI50BX950S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX950S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX950S |
| Bore size | Ø50 mm |
| Stroke | 950 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 SAI50BX950S 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 SAI50BX950S 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 SI50BX950S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×950 | 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 SI50BX950S Is Used
Long-Stroke Diverters
Ideal for pushing or diverting packages across wide conveyor belts where the 950 mm travel and 982 N force at 0.5 MPa are required.
Automated Assembly Transfer
Moves pallets or fixtures between stations over a long distance, relying on external guides to manage the 950 mm stroke side loads.
Replacing the Airtac SI50 Standard Cylinder SI50BX950S with the SAI50BX950S
To replace the discontinued SI50BX950S, order the SAI50BX950S, which is dimensionally interchangeable per ISO 15552. Confirm the G1/4 port, M16x1.5 rod thread, 30 mm cushions, and your mounting accessory (LB, FA, CA, TC, etc.). The -S magnet and -B SUS304 rod must be specified on the new order. For a 950 mm stroke, external guides are strongly recommended to prevent rod bending and side-load damage. If sizing up or down, neighboring bores (40 mm or 63 mm) offer different force classes. Because standard cylinders do not hold loads without live air, consider the SAIL or BSAI lock variants if drift is unacceptable.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX950S
- ✓ 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 SI50BX950S FAQ
Yes, the SI50BX950S is discontinued. The direct replacement is the SAI50BX950S. It shares the same ISO 15552 mounting interface, 50 mm bore, 950 mm stroke, G1/4 port, and force output, but features an upgraded two Y-shaped element piston seal for lower start-up pressure.
The bore is 50 mm with a G1/4 air port. Theoretical forces 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 maximum force of 200 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX950S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX950S replacement — usually within 7-8 hours.