This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X300TC, 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 SI50X300TC
The AirTAC SI50 Standard Cylinder SI50X300TC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 300mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X300TC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke300 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X300TC
- 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 SI50X300TC
The AirTAC SI50X300TC is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 300mm stroke. It delivers 982 N push force at 0.5 MPa via a G1/4 port. AirTAC replaced this unit with the SAI50X300TC, a direct sharing the exact TC trunnion mount, bore, stroke and output force.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. It also adds SAIL, SAIF and BSAI variants the SI lacked. Note: this no-S SKU lacks a magnet and cannot take a sensor.
Airtac SI50 Standard Cylinder SI50X300TC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X300TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X300TC |
| Bore size | Ø50 mm |
| Stroke | 300 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 SAI50X300TC 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 SAI50X300TC 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 SI50X300TC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×300 | 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 SI50X300TC Is Used
Trunnion-Mounted Diverter
Uses the ISO 15552 TC trunnion mount to pivot and push packages across a conveyor belt, absorbing the 982 N thrust over the 300mm travel.
Long-Stroke Part Ejector
Ejects machined parts from a fixture over 300mm, requiring external guide rails to prevent rod bending during the extended push cycle.
Replacing the Airtac SI50 Standard Cylinder SI50X300TC with the SAI50X300TC
To replace the SI50X300TC, order the SAI50X300TC. Confirm the ISO 15552 TC trunnion interface, 50mm bore, 300mm stroke, G1/4 port (PT/G/NPT thread) and M16x1.5 rod. Since this SKU lacks a magnet, it cannot accept CS1-B/DS1-B sensors. For sizing, the 982 N push at 0.5 MPa yields a 589 N safe load; if undersized, the 63mm bore offers 1559 N. At 300mm stroke, use an external guide to prevent rod bending and side-load wear. A plain cylinder drifts on air loss; for load holding use the SAIL lock variant or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X300TC
- ✓ 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 SI50X300TC FAQ
Yes, the SI50X300TC is discontinued. The direct replacement is the SAI50X300TC. It shares the identical ISO 15552 mounting interface, 50mm bore, 300mm stroke, output force and G1/4 port, fitting existing TC trunnion fixtures perfectly.
This double-acting cylinder uses 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. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X300TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X300TC replacement — usually within 7-8 hours.