This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X910S, 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 SI50X910S
The AirTAC Airtac SI50 Standard Cylinder SI50X910S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 910mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X910S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke910 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X910S
- 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 SI50X910S
The AirTAC SI50X910S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 910mm stroke. It delivers 982 N push and 825 N pull at 0.5 MPa through a G1/4 port. The direct replacement is the SAI50X910S, matching the interface, force, and mounting.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. It also adds SAIL, SAIF, and BSAI variants the SI lacked. This -S model uses CS1-B/DS1-B sensors; SAI uses current switches.
Airtac SI50 Standard Cylinder SI50X910S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X910S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X910S |
| Bore size | Ø50 mm |
| Stroke | 910 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 SAI50X910S 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 SAI50X910S 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 SI50X910S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×910 | 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 SI50X910S Is Used
Vertical Material Lift
Raises a 50 kg tote to an overhead conveyor, benefiting from the 982 N push force at 0.5 MPa.
Automated Door Actuation
Opens large machine guard doors over a 900mm span, requiring external guides to prevent rod bending.
Replacing the Airtac SI50 Standard Cylinder SI50X910S with the SAI50X910S
To replace the SI50X910S, order the SAI50X910S. Confirm the ISO 15552 mounting interface, 50mm bore, 910mm stroke, G1/4 port, and M16x1.5 rod thread. The -S magnet enables CS1-B/DS1-B sensors. For sizing, a 40mm bore gives 628 N push, while a 63mm bore gives 1559 N at 0.5 MPa. At 910mm, prevent rod bending by using external guides to manage side loads. A plain cylinder drifts without air; for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X910S
- ✓ 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 SI50X910S FAQ
Yes, the SI50X910S is discontinued. The direct replacement is the SAI50X910S. It is dimensionally interchangeable per ISO 15552, keeping the same 50mm bore, 910mm stroke, 982 N force, G1/4 port, and mounting fixtures.
The 50mm bore uses a G1/4 port. Force ratings are 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 SAI50X910S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X910S replacement — usually within 7-8 hours.