This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100BX325S, 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 SI100BX325S
The AirTAC Airtac SI100 Standard Cylinder SI100BX325S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 325mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100BX325S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke325 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100BX325S
- 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 SI100BX325S
The AirTAC SI100BX325S is a discontinued double-acting ISO 15552 profile cylinder featuring a 100 mm bore, 325 mm stroke, and a SUS304 stainless steel rod. Delivering 3927 N push force at 0.5 MPa via its G1/2 port, it is replaced by the SAI100BX325S. This direct successor shares the exact ISO 15552 mounting interface, bore, stroke, force, and port dimensions.
The SAI upgrade utilizes a two Y-shaped one-way piston seal for low start-up pressure and extended life. The SAI family also introduces SAIL, SAIF, and BSAI lock variants absent in the legacy SI line.
Airtac SI100 Standard Cylinder SI100BX325S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100BX325S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100BX325S |
| Bore size | Ø100 mm |
| Stroke | 325 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 SAI100BX325S 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 SAI100BX325S 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 SI100BX325S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×325 | 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 SI100BX325S Is Used
Heavy Press Staging
Holds and positions heavy metal panels at press infeed stations, utilizing the 3927 N push force to clamp parts securely before stamping.
Pallet Lift Gates
Actuates large vertical palletizing gates where the 325 mm stroke provides the necessary travel arc and the SUS304 rod resists humid dock environments.
Replacing the Airtac SI100 Standard Cylinder SI100BX325S with the SAI100BX325S
To replace the SI100BX325S, order the SAI100BX325S, confirming the ISO 15552 mounting interface, 100 mm bore, 325 mm stroke, G1/2 port, and the -S magnet for current AirTAC switches. The -B rod material specifies SUS304 stainless steel for corrosion resistance. When sizing, neighboring bores offer different forces: an 80 mm bore yields 2513 N push at 0.5 MPa, while a 125 mm bore provides 6136 N. Because this is a 325 mm stroke, use external guides to prevent rod-bending and side-load damage. 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, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100BX325S
- ✓ 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 SI100BX325S FAQ
Yes, the SI100BX325S is discontinued. The direct replacement is the AirTAC SAI100BX325S. It is dimensionally interchangeable per the ISO 15552 mounting interface, retaining the same 100 mm bore, 325 mm stroke, G1/2 port, and output force, so it drops directly into existing fixtures.
The bore is 100 mm with a G1/2 air port. The thrust 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 maximum force of 801 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100BX325S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100BX325S replacement — usually within 7-8 hours.