This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100BX25S, 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 SI100BX25S
The AirTAC Airtac SI100 Standard Cylinder SI100BX25S 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 SAI100BX25S, 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 → SAI100BX25S
- 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 SI100BX25S
The AirTAC SI100BX25S is a discontinued double-acting ISO 15552 profile cylinder featuring a SUS304 stainless piston rod and a built-in magnet. Delivering 3927 N push force at 0.5 MPa through a G1/2 port, it is replaced by the SAI100BX25S.
The SAI100BX25S direct replacement retains identical ISO 15552 mounting, stroke, and output force, but adds an upgraded two Y-shaped one-way piston seal for lower start-up pressure.
Airtac SI100 Standard Cylinder SI100BX25S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100BX25S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100BX25S |
| 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 SAI100BX25S 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 SAI100BX25S 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 SI100BX25S
| 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 SI100BX25S Is Used
Short-Stroke Clamping
Ideal for high-force 3927 N clamping of heavy steel plates in machining fixtures using the 25mm stroke.
Heavy Pressing
Provides reliable 100mm bore pressing force for seating industrial bearings and large mechanical components.
Stainless Actuation
The SUS304 rod excels in washdown automotive parts washing systems requiring corrosion resistance.
Replacing the Airtac SI100 Standard Cylinder SI100BX25S with the SAI100BX25S
To replace the SI100BX25S, order the SAI100BX25S ensuring the ISO 15552 mounting, 100mm bore, 25mm stroke, G1/2 port, and -S magnet match. The -B rod specifies SUS304 stainless steel, differing from standard carbon steel. If sizing down, an 80mm bore yields 2513 N push at 0.5 MPa; sizing up to 125mm provides 6136 N. A plain cylinder drifts on air loss as cushions only decelerate, so use a pilot check valve or SAIL lock variant for holding. The 25mm stroke needs no side-load guide.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100BX25S
- ✓ 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 SI100BX25S FAQ
Yes, the SI100BX25S is discontinued. The direct replacement is the SAI100BX25S, which shares the identical ISO 15552 mounting interface, bore, stroke, force, and G1/2 port.
It features a G1/2 port and delivers 3927 N push / 3681 N pull at 0.5 MPa, 5497 N push at 0.7 MPa, and a maximum theoretical force of 801 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100BX25S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100BX25S replacement — usually within 7-8 hours.