This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100BX325, 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 SI100BX325
The AirTAC Airtac SI100 Standard Cylinder SI100BX325 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 SAI100BX325, 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 → SAI100BX325
- 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 SI100BX325
The AirTAC SI100BX325 is a discontinued double-acting ISO 15552 profile cylinder featuring a 100mm bore, 325mm stroke, and a SUS304 stainless steel piston rod. Delivering 3927 N push force at 0.5 MPa, it is replaced by the SAI100BX325. This direct upgrade shares the exact ISO 15552 mounting interface, G1/2 port, and force ratings. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure.
Because this SKU lacks a magnet, it cannot accept position sensors. The original SI used CS1-B/DS1-B switches, but this unit is physically blind. The cushion only decelerates the load; it does not hold it on air loss. For locking needs, the SAI family adds SAIL and BSAI clamp-lock variants the SI lacked. Note the 325mm stroke requires external guides to prevent rod bending under side loads.
Airtac SI100 Standard Cylinder SI100BX325 Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100BX325 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100BX325 |
| 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 SAI100BX325 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 SAI100BX325 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 SI100BX325
| 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 SI100BX325 Is Used
Heavy Stamp Press Feed
Drives heavy material through a stamping die using 3927 N of thrust at 0.5 MPa, with the SUS304 rod resisting coolant spray.
Automated Crate Transfer
Pushes loaded pallets onto accumulation lines, utilizing the adjustable 36mm air cushions to decelerate the heavy mass safely.
Replacing the Airtac SI100 Standard Cylinder SI100BX325 with the SAI100BX325
To replace the SI100BX325, order the SAI100BX325. Confirm the ISO 15552 mounting interface, the G1/2 air port, and your specific mounting accessory (LB, FA, TC, etc.). This unit has a -B SUS304 stainless rod for corrosion resistance and no magnet, meaning it cannot take CS1-B/DS1-B sensors. If you need position sensing, switch to an SAI model with an S suffix. For sizing, the 100mm bore yields 3927 N push at 0.5 MPa; dropping to an 80mm bore gives 2513 N, while a 125mm bore yields 6136 N. Since the stroke is 325mm, use external guides to prevent rod bending. The air cushion decelerates but does not hold the load; for dead-load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100BX325
- ✓ 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 SI100BX325 FAQ
Yes, the SI100BX325 is discontinued. The direct replacement is the SAI100BX325. It shares the same ISO 15552 mounting interface, 100mm bore, 325mm stroke, G1/2 port, and output force, fitting directly into existing fixtures.
The bore is 100mm with a G1/2 air port. Force output 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 max of 801 kgf at 1.0 MPa. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100BX325
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100BX325 replacement — usually within 7-8 hours.