This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X500TC, 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 SI50X500TC
The AirTAC SI50 Standard Cylinder SI50X500TC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 500mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X500TC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke500 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X500TC
- 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 SI50X500TC
The AirTAC SI50X500TC is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 500 mm stroke. It delivers a thrust of 982 N at 0.5 MPa and features a G1/4 air port with a TC trunnion mount. Because this legacy unit is end-of-life, you should order the direct replacement: the SAI50X500TC. It matches the original bore, stroke, force, port, and ISO 15552 mounting interface, dropping directly into existing TC fixtures.
The SAI upgrade introduces a refined piston seal using two Y-shaped one-way elements for lower start-up pressure and extended life. Since this specific SI SKU lacks the -S magnet suffix, it cannot accept a CS1-B or DS1-B sensor. For high-temperature environments up to 150 C, you can specify the Viton H seal option.
Airtac SI50 Standard Cylinder SI50X500TC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X500TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X500TC |
| Bore size | Ø50 mm |
| Stroke | 500 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 SAI50X500TC 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 SAI50X500TC 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 SI50X500TC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×500 | 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 SI50X500TC Is Used
Pallet Diversion
Actuates TC-mounted routing gates on packaging lines, using the 982 N thrust to push loaded pallets onto secondary conveyors.
Material Lowering
Lowers lightweight fixtures over a 500 mm travel distance; ensure external guides are used to prevent rod bending during descent.
Assembly Press
Drives small press operations requiring a 50 kg vertical lift capacity, relying on adjustable 30 mm cushions to absorb end-of-stroke impact.
Replacing the Airtac SI50 Standard Cylinder SI50X500TC with the SAI50X500TC
To replace the discontinued SI50X500TC, order the SAI50X500TC, confirming the ISO 15552 TC trunnion mounting, 50 mm bore, 500 mm stroke, and G1/4 port (available in PT, G, or NPT threads). When sizing, evaluate neighboring bores: a 40 mm bore yields 628 N push at 0.5 MPa, while a 63 mm bore provides 1559 N. If you need load holding, note that a plain cylinder drifts on air loss—the cushion only decelerates near stroke end—so use an external pilot check valve, rod lock, or the SAIL/BSAI lock variants. Because the 500 mm stroke is long, add external guides to prevent rod bending and side-load wear. This non-magnetic SKU cannot support switches.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X500TC
- ✓ 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 SI50X500TC FAQ
Yes, the SI50X500TC is discontinued. The direct replacement is the SAI50X500TC. It shares the identical ISO 15552 TC mounting interface, 50 mm bore, 500 mm stroke, G1/4 port, and output force, fitting existing fixtures without modification.
This 50 mm bore cylinder features a G1/4 air port and a M16x1.5 rod thread. It delivers a push force of 982 N and a pull force of 825 N at 0.5 MPa. At 0.7 MPa the push force is 1374 N, and the theoretical maximum is 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X500TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X500TC replacement — usually within 7-8 hours.