This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100BX20S, 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 SI100BX20S
The AirTAC Airtac SI100 Standard Cylinder SI100BX20S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 20mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100BX20S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke20 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100BX20S
- 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 SI100BX20S
The AirTAC SI100BX20S is a discontinued double-acting ISO 15552 profile cylinder with a 100 mm bore and 20 mm stroke. It delivers 3927 N push force at 0.5 MPa through a G1/2 port. The direct replacement is the SAI100BX20S, matching the interface, force, and mounting.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. This variant has a SUS304 stainless rod (-B) and a magnet (-S) for CS1-B/DS1-B sensors.
Airtac SI100 Standard Cylinder SI100BX20S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100BX20S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100BX20S |
| Bore size | Ø100 mm |
| Stroke | 20 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 SAI100BX20S 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 SAI100BX20S 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 SI100BX20S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×20 | 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 SI100BX20S Is Used
Short-Stroke Clamping
Ideal for high-force short-stroke clamping of heavy steel plates in machining fixtures, utilizing the 3927 N push force at 0.5 MPa.
Heavy Product Diversion
Provides robust actuation to divert heavy pallets or large packaged goods on assembly lines, benefiting from the 100 mm bore capacity.
Pallet Stopper Gate
Functions as a heavy-duty stopper gate on roller conveyors, where the 20 mm stroke rapidly blocks or releases large loads.
Replacing the Airtac SI100 Standard Cylinder SI100BX20S with the SAI100BX20S
To replace the SI100BX20S, order the SAI100BX20S. Confirm the ISO 15552 mounting interface, G1/2 port, M20x1.5 rod thread, SUS304 rod, and the -S magnet for legacy CS1-B/DS1-B sensors. For sizing, the 100 mm bore yields 3927 N push at 0.5 MPa; a neighbouring 80 mm bore provides 2513 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100BX20S
- ✓ 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 SI100BX20S FAQ
Yes, the SI100BX20S is discontinued. The direct replacement is the SAI100BX20S. It is dimensionally interchangeable per the ISO 15552 mounting interface, maintaining the same 100 mm bore, 20 mm stroke, force, G1/2 port, and mounting accessories.
This double-acting cylinder uses a G1/2 port. The thrust is 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 maximum of 801 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100BX20S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100BX20S replacement — usually within 7-8 hours.