This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X350TC, 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 SI50X350TC
The AirTAC SI50 Standard Cylinder SI50X350TC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 350mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X350TC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke350 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X350TC
- 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 SI50X350TC
The AirTAC SI50X350TC is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 350mm stroke. It delivers 982N push force at 0.5MPa via a G1/4 port. AirTAC replaced this unit with the SAI50X350TC, a direct upgrade retaining the exact TC trunnion mounting interface, stroke, and output force.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. For sensing, note this specific SKU lacks a magnet (-S) and cannot accept a CS1-B/DS1-B switch. The SAI family also introduces SAIL, SAIF, and BSAI lock variants absent in the legacy line.
Airtac SI50 Standard Cylinder SI50X350TC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X350TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X350TC |
| Bore size | Ø50 mm |
| Stroke | 350 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 SAI50X350TC 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 SAI50X350TC 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 SI50X350TC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×350 | 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 SI50X350TC Is Used
Material Diversion
Drives a 350mm stroke diverter arm on a packaging line, utilizing the 982N push force at 0.5MPa to shift cartons between adjacent belts.
Component Ejection
Pushes machined parts out of a CNC enclosure using the TC trunnion mount to accommodate the 350mm extended rod length.
Replacing the Airtac SI50 Standard Cylinder SI50X350TC with the SAI50X350TC
To replace the SI50X350TC, order the SAI50X350TC. Verify the ISO 15552 TC trunnion interface, 50mm bore, 350mm stroke, G1/4 port (PT/G/NPT thread options), and confirm this no-magnet SKU cannot support sensing. Because the 350mm stroke exceeds 300mm, use an external guide to prevent rod bending and side-load wear. Sizing options: step down to a 40mm bore (628N push @0.5MPa) for lighter loads, or up to a 63mm bore (1559N push @0.5MPa) for heavier tasks. This plain cylinder will drift on air loss; for load holding, use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X350TC
- ✓ 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 SI50X350TC FAQ
Yes, the SI50X350TC is discontinued. The direct replacement is the SAI50X350TC. It is dimensionally interchangeable per ISO 15552, matching the 50mm bore, 350mm stroke, G1/4 port, TC mount, and output force.
The 50mm bore features a G1/4 air port and M16x1.5 rod thread. Force ratings are: 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a theoretical max of 200kgf at 1.0MPa. Speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X350TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X350TC replacement — usually within 7-8 hours.