This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X208TC, 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 SI50X208TC
The AirTAC SI50 Standard Cylinder SI50X208TC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 208mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X208TC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke208 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X208TC
- 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 SI50X208TC
The AirTAC SI50X208TC is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 208mm stroke. Delivering 982N push force at 0.5MPa via a G1/4 port, it is replaced by the SAI50X208TC. This direct successor shares the exact TC trunnion mount, interface, and output force.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. Note this SKU lacks a magnet (-S) so it cannot take a sensor.
Airtac SI50 Standard Cylinder SI50X208TC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X208TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X208TC |
| Bore size | Ø50 mm |
| Stroke | 208 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 SAI50X208TC 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 SAI50X208TC 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 SI50X208TC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×208 | 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 SI50X208TC Is Used
Package Diverting
Actuates routing gates on packaging lines using the TC trunnion to handle 50kg class loads smoothly.
Clamp Actuation
Drives mid-force clamping fixtures in assembly cells, benefiting from the 30mm adjustable end cushions.
Replacing the Airtac SI50 Standard Cylinder SI50X208TC with the SAI50X208TC
To replace the SI50X208TC, order the SAI50X208TC. Confirm the ISO 15552 TC trunnion interface, 50mm bore, 208mm stroke, G1/4 port, and thread type (PT/G/NPT). This 208mm stroke is nonstandard (exceeds standard increments but is under the 1200mm max), so ensure rod-bending limits are acceptable for your side loads. Sizing both ways: a 63mm bore yields 1559N push at 0.5MPa, while a 40mm bore yields 628N. The plain cylinder drifts on air loss; for load holding use an external pilot check valve or the SAIL/BSAI lock variants. Without a magnet, this SKU cannot accept CS1-B/DS1-B sensors.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X208TC
- ✓ 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 SI50X208TC FAQ
Yes, the SI50X208TC is discontinued. The direct replacement is the SAI50X208TC. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 208mm stroke, G1/4 port, TC mount, and force ratings.
This double-acting cylinder has a G1/4 port. It provides 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N at 0.9MPa, and a theoretical max of 200kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X208TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X208TC replacement — usually within 7-8 hours.