This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X100FTC, 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 SI50X100FTC
The AirTAC Airtac SI50 Standard Cylinder SI50X100FTC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 100mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X100FTC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke100 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X100FTC
- 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 SI50X100FTC
The AirTAC SI50X100FTC is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 100 mm stroke. It delivers 982 N push and 825 N pull at 0.5 MPa through a G1/4 port. Because this legacy unit is end-of-life, AirTAC specifies the SAI50X100FTC as the direct replacement. It matches the original bore, stroke, output force, porting, and FTC trunnion mounting interface, dropping directly into existing fixtures.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. Note this specific SKU lacks the -S magnet, so it cannot accept CS1-B or DS1-B sensors. The SAI family also introduces SAIL, SAIF, and BSAI lock or valve variants absent from the SI line.
Airtac SI50 Standard Cylinder SI50X100FTC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X100FTC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X100FTC |
| Bore size | Ø50 mm |
| Stroke | 100 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 SAI50X100FTC 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 SAI50X100FTC 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 SI50X100FTC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×100 | 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 SI50X100FTC Is Used
Pallet Gate Actuation
Drives light safety gates or stops. The 50 kg vertical lift margin handles counterweight loads easily within a 100 mm travel.
Compact Clamping
Secures workpieces during machining. The 982 N push force at 0.5 MPa provides firm holding without deforming lighter materials.
Replacing the Airtac SI50 Standard Cylinder SI50X100FTC with the SAI50X100FTC
To replace the SI50X100FTC, order the SAI50X100FTC. Verify your ISO 15552 FTC trunnion interface, 50 mm bore, 100 mm stroke, and G1/4 port (available in PT, G, or NPT). This SKU has no -S magnet, meaning no position sensing is possible; if switches are needed, select a magnet-equipped SAI. If sizing up or down, neighboring bores are 40 mm (628 N push @0.5 MPa) and 63 mm (1559 N push @0.5 MPa). A plain cylinder drifts without live air; the adjustable 30 mm cushions only decelerate near stroke ends. For load holding on air loss, use an external pilot check valve, rod lock, or the SAIL/BSAI lock variants. The 100 mm stroke is well within standard limits, so rod-bending side loads are minimal, but always guide the load.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X100FTC
- ✓ 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 SI50X100FTC FAQ
Yes, the SI50X100FTC is discontinued. The direct replacement is the SAI50X100FTC. It is dimensionally interchangeable per ISO 15552, preserving the 50 mm bore, 100 mm stroke, 982 N force, G1/4 port, and FTC mount.
It features a G1/4 port, a 20 mm rod, and M16x1.5 thread. Force output is 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, 1767 N push at 0.9 MPa, with a theoretical max of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X100FTC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X100FTC replacement — usually within 7-8 hours.