This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X100S, 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 SI50X100S
The AirTAC SI50 Standard Cylinder SI50X100S 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 SAI50X100S, 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 → SAI50X100S
- 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 SI50X100S
The AirTAC SI50X100S 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. AirTAC replaced this legacy unit with the SAI50X100S. This current-production direct maintains the exact ISO 15552 mounting interface, bore, stroke, output force, port size and mounting accessories, fitting existing fixtures perfectly.
The SAI upgrade features a redesigned piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The SI50X100S includes a magnet for legacy CS1-B/DS1-B sensors, while the SAI family expands options with SAIL lock, SAIF valve and BSAI clamp variants.
Airtac SI50 Standard Cylinder SI50X100S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X100S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X100S |
| 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 SAI50X100S 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 SAI50X100S 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 SI50X100S
| 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 SI50X100S Is Used
Package Diversion
Ideal for pushing medium-weight cartons on packaging lines, utilizing the 100 mm stroke and 982 N force at 0.5 MPa for reliable lateral sorting.
Clamp Actuation
Provides robust clamping force for machining fixtures, where the 50 mm bore delivers precise holding without deforming the workpiece.
Replacing the Airtac SI50 Standard Cylinder SI50X100S with the SAI50X100S
To replace the discontinued SI50X100S, order the SAI50X100S. Confirm your ISO 15552 mounting interface, 50 mm bore, 100 mm stroke, G1/4 port (PT/G/NPT) and mounting accessory. The -S suffix indicates a piston magnet for CS1-B/DS1-B switches; the SAI replacement uses current AirTAC switches. Sizing both ways: a neighbouring 63 mm bore yields 1559 N push at 0.5 MPa, while a 40 mm bore gives 628 N. Note that a plain cylinder does not hold load on air loss—the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. Rod material options include carbon steel, SUS420J2 (A) or SUS304 (B); seal options include Viton H for high temp.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X100S
- ✓ 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 SI50X100S FAQ
Yes, the AirTAC SI50X100S is discontinued. The direct replacement is the SAI50X100S. It is a true ISO 15552 profile cylinder that maintains the same 50 mm bore, 100 mm stroke, G1/4 port and mounting interface, dropping directly into existing fixtures.
This double-acting cylinder features a G1/4 air port and M16x1.5 rod thread. It delivers 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, and a theoretical maximum force of 200 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X100S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X100S replacement — usually within 7-8 hours.