This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100BX50S, 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 SI100 Standard Cylinder SI100BX50S
The AirTAC Airtac SI100 Standard Cylinder SI100BX50S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 50mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100BX50S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke50 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100BX50S
- 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 SI100 Standard Cylinder SI100BX50S
The AirTAC SI100BX50S is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore and 50mm stroke. Featuring a SUS304 stainless piston rod, it delivers 3927 N push force at 0.5 MPa and uses a G1/2 air port. The direct replacement is the SAI100BX50S, matching the bore, stroke, force, port and ISO 15552 mounting interface.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The SAI family also adds SAIL, SAIF and BSAI lock variants the SI lacked. The -S magnet on this unit supports legacy CS1-B/DS1-B sensors.
Airtac SI100 Standard Cylinder SI100BX50S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100BX50S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100BX50S |
| Bore size | Ø100 mm |
| Stroke | 50 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M20×1.5 |
| 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, 36 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI100BX50S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø100mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 3927 N | 3682 N |
| 0.7 MPa | 5498 N | — |
| Max (@1.0 MPa) | 801 kgf | |
The SAI100BX50S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI100 Standard Cylinder SI100BX50S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×50 | 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 SI100 Standard Cylinder SI100BX50S Is Used
Heavy Stamping Press
Drives heavy-duty stamping and forming dies requiring high thrust over a short 50mm stroke.
Pallet Stopper Gate
Acts as a robust 100mm bore stopper gate for heavy pallets, using the SUS304 rod in humid settings.
Material Press Platen
Presses composite or rubber materials flat, utilizing the 3927 N push force at 0.5 MPa.
Replacing the Airtac SI100 Standard Cylinder SI100BX50S with the SAI100BX50S
To replace the SI100BX50S, order the SAI100BX50S. Confirm the ISO 15552 mounting interface, the 50mm stroke, the G1/2 port (PT/G/NPT thread options) and your mounting accessory. Because this unit has the -S magnet, it accepts legacy CS1-B/DS1-B switches, while the SAI replacement uses current AirTAC sensors. The -B rod specifies SUS304 stainless steel for corrosion resistance. Sizing both ways: this 100mm bore gives 3927 N push at 0.5 MPa; a neighbouring 80mm bore yields 2513 N, and a 125mm bore yields 6136 N. Note that a plain cylinder drifts on air loss as the cushion only decelerates; for load holding, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100BX50S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI100 Standard Cylinder SI100BX50S FAQ
Yes, the SI100BX50S is discontinued. The direct replacement is the SAI100BX50S. It is dimensionally interchangeable per ISO 15552, matching the 100mm bore, 50mm stroke, force, G1/2 port and mounting fixtures.
It features a G1/2 air port. The force ratings are: 3927 N push and 3681 N pull at 0.5 MPa, 5497 N push at 0.7 MPa, 7068 N push at 0.9 MPa, and a theoretical max of 801 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100BX50S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100BX50S replacement — usually within 7-8 hours.