This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X100SFTC, 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 SI50X100SFTC
The AirTAC Airtac SI50 Standard Cylinder SI50X100SFTC 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 SAI50X100SFTC, 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 → SAI50X100SFTC
- 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 SI50X100SFTC
The AirTAC SI50X100SFTC is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 100mm stroke. It delivers 982N push force at 0.5MPa via a G1/4 port. AirTAC replaced this unit with the SAI50X100SFTC, a direct upgrade sharing the exact ISO 15552 mounting interface, FTC trunnion mount, and 200kgf maximum output.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The SAI family also introduces SAIL lock, SAIF valve, and BSAI clamp variants unavailable in the legacy SI line.
Airtac SI50 Standard Cylinder SI50X100SFTC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X100SFTC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X100SFTC |
| 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 SAI50X100SFTC 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 SAI50X100SFTC 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 SI50X100SFTC
| 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 SI50X100SFTC Is Used
Package Diversion
Actuates sorting gates on packaging lines, utilizing the 982N push force to reliably deflect moderate-weight cartons at high speeds.
Clamp Actuation
Provides consistent clamping pressure for light machining fixtures, taking advantage of the 50mm bore and FTC trunnion mount for pivot alignment.
Replacing the Airtac SI50 Standard Cylinder SI50X100SFTC with the SAI50X100SFTC
To replace the SI50X100SFTC, order the SAI50X100SFTC. Verify the ISO 15552 interface, 50mm bore, 100mm stroke, G1/4 port, and FTC trunnion mounting. The -S suffix means a magnet is present for CS1-B/DS1-B legacy sensors; the SAI uses current AirTAC switches. For sizing, the 40mm bore yields 628N push at 0.5MPa, while the 63mm bore yields 1559N. Remember, a plain cylinder does not hold load without live air; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X100SFTC
- ✓ 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 SI50X100SFTC FAQ
Yes, the SI50X100SFTC is discontinued. The direct replacement is the SAI50X100SFTC. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 100mm stroke, G1/4 port, and FTC mounting interface.
The 50mm bore features a G1/4 air port. At 0.5MPa it provides 982N push and 825N pull force. At 0.7MPa push is 1374N, and at 0.9MPa it is 1767N. The theoretical maximum force is 200kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X100SFTC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X100SFTC replacement — usually within 7-8 hours.