This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X370, 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 SI50X370
The AirTAC Airtac SI50 Standard Cylinder SI50X370 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 370mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X370, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke370 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X370
- 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 SI50X370
The AirTAC SI50X370 is a discontinued double-acting ISO 15552 profile cylinder delivering 982 N push force at 0.5 MPa through a 50 mm bore and 370 mm stroke. AirTAC replaced it with the SAI50X370, a direct upgrade retaining the exact ISO 15552 mounting interface, G1/4 port, and 200 kgf maximum output. Because this specific SKU lacks the -S magnet suffix, it cannot accept a position sensor.
The SAI replacement introduces an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and extended life. If high-temperature operation is needed, Viton H seals raise the limit to 150 C, while the legacy SI sensor groove accommodates CS1-B or DS1-B switches on magnet-equipped variants.
Airtac SI50 Standard Cylinder SI50X370 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X370 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X370 |
| Bore size | Ø50 mm |
| Stroke | 370 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 SAI50X370 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 SAI50X370 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 SI50X370
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×370 | 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 SI50X370 Is Used
Carton Diverting
Pushes packages at 30-800 mm/s on packaging lines, using the 982 N thrust to redirect heavier cardboard cartons smoothly.
Pallet Handling
Acts as a stopper or alignment gate for inbound pallets, where the 50 kg vertical lift capacity and 370 mm reach clear standard pallet bases.
Light Pressing
Provides consistent downward pressure for assembling small components, relying on adjustable air cushions to decelerate at stroke end.
Replacing the Airtac SI50 Standard Cylinder SI50X370 with the SAI50X370
To replace the discontinued SI50X370, order the SAI50X370. Verify your ISO 15552 mounting accessory (LB, FA, TC, etc.), the 370 mm stroke, and the G1/4 port. Because this unit has no -S magnet, it cannot support sensing; if switches are required, select an SAI50X370S and use current AirTAC sensors. For sizing, the 50 mm bore yields 982 N push at 0.5 MPa; if less force is acceptable, a 40 mm bore provides 628 N. Note that a plain cylinder drifts without live air; for load holding, consider the SAIL lock or BSAI clamp-lock variant, or an external pilot check valve. Finally, at 370 mm, prevent rod bending by guiding the load externally to avoid side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X370
- ✓ 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 SI50X370 FAQ
Yes, the SI50X370 is discontinued. The direct replacement is the SAI50X370. It shares the same ISO 15552 mounting interface, 50 mm bore, 370 mm stroke, G1/4 port, and output force, fitting existing fixtures perfectly.
The 50 mm bore features a G1/4 port and M16x1.5 rod thread. It delivers 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. Operating speed is 30-800 mm/s.
Request a Quote for the SAI50X370
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X370 replacement — usually within 7-8 hours.