This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X150FA, 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 SI50X150FA
The AirTAC Airtac SI50 Standard Cylinder SI50X150FA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 150mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X150FA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke150 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X150FA
- 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 SI50X150FA
The AirTAC SI50X150FA is a discontinued double-acting ISO 15552 profile cylinder featuring a 50 mm bore and 150 mm stroke. It delivers 982 N push force at 0.5 MPa through a G1/4 port. The direct replacement is the SAI50X150FA, which shares the exact same FA flange mounting, interface, and output force.
This SAI upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure and longer life. Because this specific SI SKU lacks the -S magnet, it cannot accept position sensors; the legacy family used CS1-B/DS1-B switches.
Airtac SI50 Standard Cylinder SI50X150FA Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X150FA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X150FA |
| Bore size | Ø50 mm |
| Stroke | 150 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 SAI50X150FA 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 SAI50X150FA 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 SI50X150FA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×150 | 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 SI50X150FA Is Used
Clamp Actuation
Ideal for providing 982 N of clamping force on machining fixtures, utilizing the FA flange to secure the body rigidly against lateral stress.
Package Diversion
Drives 150 mm stroke diverting arms on packaging lines to route boxes, operating reliably at speeds between 30-800 mm/s.
Replacing the Airtac SI50 Standard Cylinder SI50X150FA with the SAI50X150FA
To replace the SI50X150FA, order the SAI50X150FA. Confirm the ISO 15552 interface, 50 mm bore, 150 mm stroke, G1/4 port, and FA flange mounting. Since this unit lacks the -S magnet, it cannot support sensing; if switches are needed, select an SAI variant with the S suffix. Sizing both ways: step down to a 40 mm bore for 628 N push at 0.5 MPa, or up to a 63 mm bore for 1559 N. Note that a plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external pilot check valve or explore the SAIL or BSAI lock variants. For this 150 mm stroke, ensure guide alignment to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X150FA
- ✓ 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 SI50X150FA FAQ
Yes, the SI50X150FA is discontinued. The direct replacement is the SAI50X150FA. It is dimensionally interchangeable per ISO 15552, retaining the same 50 mm bore, 150 mm stroke, G1/4 port, and FA flange mounting interface.
It features a G1/4 air port and provides 982 N push and 825 N pull at 0.5 MPa. At 0.7 MPa push is 1374 N, and at 0.9 MPa it is 1767 N. The theoretical maximum force is 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X150FA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X150FA replacement — usually within 7-8 hours.