This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X100SN, 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 SI50X100SN
The AirTAC Airtac SI50 Standard Cylinder SI50X100SN 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 SAI50X100SN, 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 → SAI50X100SN
- 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 SI50X100SN
The AirTAC SI50X100SN is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 100mm stroke, delivering 982N push force at 0.5MPa through its G1/4 port. As an end-of-life component, it must be replaced by the current-production SAI50X100SN. This direct successor matches the exact ISO 15552 mounting interface, bore, stroke, output force, and port size, fitting existing fixtures perfectly.
The SAI upgrade introduces a refined piston seal featuring two Y-shaped one-way elements for extended lifespan and lower start-up pressure. The original SI50X100SN includes a piston magnet for CS1-B/DS1-B switches and an NBR seal rated for -20 to +70C; a Viton H option can extend this to 0-150C.
Airtac SI50 Standard Cylinder SI50X100SN Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X100SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X100SN |
| 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 SAI50X100SN 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 SAI50X100SN 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 SI50X100SN
| 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 SI50X100SN Is Used
Package Diversion
Actuates routing gates on packaging lines where 982N push force reliably redirects moderate-weight cartons without bounce.
Clamp Actuation
Provides consistent 50kg vertical clamping pressure for machining fixtures, utilizing the 100mm stroke to clear workpieces.
Pallet Stopper
Deploys a mechanical stop on roller conveyors, using the G1/4 port and 825N pull force to hold pallets securely.
Replacing the Airtac SI50 Standard Cylinder SI50X100SN with the SAI50X100SN
To replace the discontinued SI50X100SN, order the SAI50X100SN direct equivalent, confirming the ISO 15552 mounting interface, 50mm bore, 100mm stroke, G1/4 port (PT/G/NPT thread options), and your specific mounting accessory (LB, FA, TC, etc.). The -S denotes a piston magnet for legacy CS1-B/DS1-B sensors, while the -N indicates an NBR seal. If sizing up or down, neighbouring bores (40mm and 63mm) offer 628N and 1559N push at 0.5MPa respectively. Note that a plain cylinder does not hold load without live air; the cushion only decelerates. For load holding on air loss, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variants. The SAI family also adds the SAIF self-valve option (bores 32-100) absent in the SI line.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X100SN
- ✓ 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 SI50X100SN FAQ
Yes, the SI50X100SN is discontinued. The direct replacement is the SAI50X100SN. It shares the identical ISO 15552 mounting interface, 50mm bore, 100mm stroke, force, G1/4 port, and accessories, fitting existing fixtures seamlessly.
It features a G1/4 air port and provides 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, and 1767N push at 0.9MPa. The theoretical maximum force is 200kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X100SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X100SN replacement — usually within 7-8 hours.