This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X302S, 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 SI50X302S
The AirTAC SI50 Standard Cylinder SI50X302S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 302mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X302S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke302 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X302S
- 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 SI50X302S
The AirTAC SI50X302S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 302mm stroke. It delivers 982 N push and 825 N pull at 0.5 MPa through a G1/4 port. The direct replacement is the SAI50X302S, sharing identical mounting, force, and stroke specifications.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This -S model includes a piston magnet for CS1-B/DS1-B switches, and seal options include high-temp Viton H.
Airtac SI50 Standard Cylinder SI50X302S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X302S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X302S |
| Bore size | Ø50 mm |
| Stroke | 302 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 SAI50X302S 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 SAI50X302S 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 SI50X302S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×302 | 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 SI50X302S Is Used
Package Diversion
Drives sorting arms on packaging lines where the 982 N push force easily deflects standard cartons over a 302 mm travel distance.
Pallet Stops
Acts as a pneumatic stop gate for lightweight pallets, using the 825 N pull force to retract the barrier out of the conveyor path.
Vertical Lowering
Lowers light fixtures up to 50 kg safely, relying on the adjustable 30 mm air cushions to decelerate the load near the end of the 302 mm stroke.
Replacing the Airtac SI50 Standard Cylinder SI50X302S with the SAI50X302S
To replace the SI50X302S, order the SAI50X302S. Verify your ISO 15552 mounting interface (LB, FA, TC, etc.), the G1/4 port thread, and the M16x1.5 rod end. Because this is a 302mm stroke, use external guides to prevent rod bending and side-load wear. If you need more force, the 63mm bore offers 1559 N at 0.5 MPa; if less is needed, the 40mm bore provides 628 N. Note that a standard cylinder drifts on air loss; for load holding, use the SAIL lock, BSAI clamp-lock, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X302S
- ✓ 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 SI50X302S FAQ
Yes, the SI50X302S is discontinued. The direct replacement is the SAI50X302S. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 302mm stroke, G1/4 port, and mounting fixtures.
The 50mm bore features a G1/4 air port. It generates 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical maximum of 200 kgf at 1.0 MPa. Speed range is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X302S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X302S replacement — usually within 7-8 hours.