This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X100FA, 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 SI50X100FA
The AirTAC Airtac SI50 Standard Cylinder SI50X100FA 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 SAI50X100FA, 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 → SAI50X100FA
- 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 SI50X100FA
The AirTAC SI50X100FA 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. The direct replacement is the SAI50X100FA, matching the exact FA flange interface, M16x1.5 rod thread and 30mm cushions.
Upgrading to the SAI brings a two Y-shaped one-way piston seal for low start-up pressure. This non-magnet SKU cannot take a sensor, unlike CS1-B equipped versions. The SAI family also adds SAIF valve and BSAI clamp-lock variants.
Airtac SI50 Standard Cylinder SI50X100FA Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X100FA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X100FA |
| 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 SAI50X100FA 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 SAI50X100FA 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 SI50X100FA
| 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 SI50X100FA Is Used
Clamp Actuation
Provides 982N of push force at 0.5MPa for securing medium workpieces during machining operations.
Package Diversion
Drives a 100mm stroke diverter arm to route moderate-weight cartons on a packaging line.
Gate Control
Operates access gates or material stops using the FA flange mount in logistics sorting hubs.
Replacing the Airtac SI50 Standard Cylinder SI50X100FA with the SAI50X100FA
To replace this SI50X100FA, order the SAI50X100FA. Verify the ISO 15552 FA flange, 100mm stroke, G1/4 port and M16x1.5 thread. This non-magnet version cannot accept CS1-B/DS1-B sensors. For sizing, neighbouring bores are 40mm (628N push @0.5MPa) and 63mm (1559N push @0.5MPa). Note that a plain cylinder drifts on air loss; the cushions only decelerate. For load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X100FA
- ✓ 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 SI50X100FA FAQ
Yes, the SI50X100FA is discontinued. The direct replacement is the SAI50X100FA. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 100mm stroke, FA flange, G1/4 port and 982N force.
This double-acting cylinder has a 50mm bore, 20mm rod, G1/4 port, M16x1.5 thread and 30mm cushions. It operates at 30-800mm/s. Forces are: push 982N and pull 825N at 0.5MPa, push 1374N at 0.7MPa, with a theoretical max of 200kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X100FA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X100FA replacement — usually within 7-8 hours.