This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX950, 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 SI50BX950
The AirTAC Airtac SI50 Standard Cylinder SI50BX950 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 SAI50BX950, 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 → SAI50BX950
- 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 SI50BX950
The AirTAC SI50BX950 is a discontinued double-acting ISO 15552 profile cylinder featuring a 50mm bore, 950mm stroke, and a SUS304 stainless piston rod for corrosion resistance. It delivers 982 N push force at 0.5 MPa via a G1/4 port. AirTAC replaced this EOL unit with the SAI50BX950, a direct upgrade sharing the exact ISO 15552 mounting interface, bore, stroke, and force ratings.
The SAI successor introduces an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. Note this non-magnet SKU cannot accept position sensors, and its 950mm length requires external guides to prevent rod bending under side loads.
Airtac SI50 Standard Cylinder SI50BX950 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX950 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX950 |
| 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 SAI50BX950 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 SAI50BX950 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 SI50BX950
| 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 SI50BX950 Is Used
Long-Stroke Diversion
Drives large package pushers across wide conveyor belts, utilizing the 950mm stroke and 982 N force at 0.5 MPa to redirect heavy goods reliably.
Corrosive Environment Actuation
Actuates heavy doors or process gates in washdown areas, leveraging the stainless steel rod and robust ISO 15552 profile barrel over extended distances.
Replacing the Airtac SI50 Standard Cylinder SI50BX950 with the SAI50BX950
To replace the SI50BX950, order the SAI50BX950, confirming the ISO 15552 interface, 50mm bore, 950mm stroke, G1/4 port, and SUS304 rod. Because this 950mm stroke lacks a magnet (-S), it cannot support CS1-B/DS1-B switches; add an S suffix if sensing is needed. For sizing alternatives, a 40mm bore yields 628 N push at 0.5 MPa, while a 63mm bore provides 1559 N. This cylinder does not hold load without live air; the cushion only decelerates. For load holding, use an external pilot check valve, rod lock, or the SAIL/BSAI lock variants. At 950mm, external guides are critical to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX950
- ✓ 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 SI50BX950 FAQ
Yes, the AirTAC SI50BX950 is discontinued. The direct replacement is the SAI50BX950. It shares the same ISO 15552 mounting interface, 50mm bore, 950mm stroke, G1/4 port, and force ratings, fitting existing fixtures perfectly.
It features a 50mm bore, 950mm stroke, G1/4 port, and a SUS304 rod. Operating pressure is 0.15-1.0 MPa. Force output is 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical max of 200 kgf at 1.0 MPa. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX950
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX950 replacement — usually within 7-8 hours.