This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X510STC, 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 SI50X510STC
The AirTAC SI50 Standard Cylinder SI50X510STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 510mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X510STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke510 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X510STC
- 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 SI50X510STC
The AirTAC SI50X510STC is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 510mm stroke. It delivers 982N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI50X510STC, matching the bore, stroke, force, port and TC trunnion mount exactly.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family adds SAIL, SAIF and BSAI lock variants. The original -S magnet works with CS1-B/DS1-B sensors, while SAI uses current AirTAC switches.
Airtac SI50 Standard Cylinder SI50X510STC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X510STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X510STC |
| Bore size | Ø50 mm |
| Stroke | 510 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 SAI50X510STC 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 SAI50X510STC 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 SI50X510STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×510 | 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 SI50X510STC Is Used
Long-Stroke Diversion
Pushes packages across a 510mm lane span on a sorting line, utilizing the 982N thrust to actuate routing flaps reliably.
Pallet Stopper
Extends 510mm to halt pallets at a TC-mounted trunnion checkpoint, handling the impact via the ISO 15552 profile barrel.
Replacing the Airtac SI50 Standard Cylinder SI50X510STC with the SAI50X510STC
To replace the SI50X510STC, order the SAI50X510STC. Verify the ISO 15552 interface, 50mm bore, 510mm stroke, G1/4 port, M16x1.5 rod thread, TC trunnion mount and the -S magnet. At 0.5MPa it yields 982N push and 825N pull; if undersized, the 63mm bore offers 1559N. Because stroke is 510mm, use an external guide to prevent rod bending and side-load wear. A plain cylinder drifts on air loss; for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X510STC
- ✓ 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 SI50X510STC FAQ
Yes, the SI50X510STC is discontinued. The direct replacement is the SAI50X510STC. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 510mm stroke, 982N force, G1/4 port and TC mounting interface.
The bore is 50mm with a G1/4 air port. At 0.5MPa it provides 982N push and 825N pull force. At 0.7MPa push is 1374N, and at 0.9MPa it is 1767N. The theoretical maximum force is 200kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X510STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X510STC replacement — usually within 7-8 hours.