This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100BX25, 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 SI100BX25
The AirTAC Airtac SI100 Standard Cylinder SI100BX25 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 25mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100BX25, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke25 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100BX25
- 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 SI100BX25
The AirTAC SI100BX25 is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore and 25mm stroke. Delivering 3927 N push and 3681 N pull at 0.5 MPa, it features a SUS304 stainless piston rod for corrosion resistance. The direct replacement is the SAI100BX25, which shares the exact G1/2 port, M20x1.5 thread, and ISO 15552 mounting interface.
The SAI100BX25 upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life. Note this no-magnet SKU cannot take a sensor; legacy -S versions used CS1-B/DS1-B switches.
Airtac SI100 Standard Cylinder SI100BX25 Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100BX25 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100BX25 |
| Bore size | Ø100 mm |
| Stroke | 25 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 SAI100BX25 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 SAI100BX25 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 SI100BX25
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×25 | 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 SI100BX25 Is Used
High-Force Clamping
Secures heavy steel plates in machining fixtures using 3927 N of push force at 0.5 MPa.
Pallet Stopping
Acts as a robust end-stop for loaded pallets, absorbing impact with its 36mm adjustable cushion.
Press Ejection
Ejects dense molded parts from presses, utilizing the SUS304 stainless rod in humid environments.
Replacing the Airtac SI100 Standard Cylinder SI100BX25 with the SAI100BX25
To replace the SI100BX25, order the SAI100BX25. Verify your ISO 15552 mounting fixtures, 100mm bore, 25mm stroke, G1/2 port, and SUS304 rod. Sizing both ways: a neighbouring 80mm bore yields 2513 N push at 0.5 MPa, while a 125mm bore yields 6136 N. This plain cylinder does not hold load without live air; for load holding on air loss, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. The SAI family also offers the SAIF self-valve variant (bores 32-100).
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100BX25
- ✓ 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 SI100BX25 FAQ
Yes, the AirTAC SI100BX25 is discontinued. The direct replacement is the SAI100BX25. It is dimensionally interchangeable per ISO 15552, retaining the same 100mm bore, 25mm stroke, G1/2 port, and mounting interface.
This double-acting cylinder has a G1/2 port. It delivers 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 SAI100BX25
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100BX25 replacement — usually within 7-8 hours.