This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X235S, 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 SI50X235S
The AirTAC Airtac SI50 Standard Cylinder SI50X235S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 235mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X235S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke235 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X235S
- 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 SI50X235S
The AirTAC SI50X235S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 235mm stroke. It delivers 982N push and 825N pull at 0.5MPa through a G1/4 port. The direct replacement is the SAI50X235S, matching the exact interface, force, and mounting.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. The SI50X235S includes a magnet for CS1-B/DS1-B switches. For load holding, use the SAIL lock or BSAI clamp-lock variants, as cushions only decelerate.
Airtac SI50 Standard Cylinder SI50X235S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X235S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X235S |
| Bore size | Ø50 mm |
| Stroke | 235 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 SAI50X235S 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 SAI50X235S 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 SI50X235S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×235 | 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 SI50X235S Is Used
Pallet Stop Gate
Acts as a pneumatic stop for incoming pallets, absorbing kinetic energy via the 30mm adjustable air cushions at both ends.
Component Clamping
Holds aluminium castings for machining, providing 825N pull force at 0.5MPa while the -S magnet confirms clamp position.
Replacing the Airtac SI50 Standard Cylinder SI50X235S with the SAI50X235S
To replace the SI50X235S, order the SAI50X235S. Verify the ISO 15552 mounting interface, 50mm bore, 235mm stroke, G1/4 port (PT/G/NPT), and the -S magnet for position sensing. If you need more force, the 63mm bore yields 1559N push at 0.5MPa; if less is required, the 40mm bore provides 628N. For stroke lengths over 200mm, use a guide to prevent rod bending and side-load wear. A plain cylinder drifts on air loss; for held loads, specify the SAIL or BSAI lock variant, or add an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X235S
- ✓ 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 SI50X235S FAQ
Yes, the SI50X235S is discontinued. The direct replacement is the SAI50X235S. It shares the same ISO 15552 mounting interface, 50mm bore, 235mm stroke, 982N force, G1/4 port, and magnet, fitting existing fixtures perfectly.
The 50mm bore uses a G1/4 air port and M16x1.5 rod thread. It generates 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, and a theoretical maximum of 200kgf at 1.0MPa. Operating speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X235S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X235S replacement — usually within 7-8 hours.