This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100AX25S, 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 SI100AX25S
The AirTAC Airtac SI100 Standard Cylinder SI100AX25S 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 SAI100AX25S, 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 → SAI100AX25S
- 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 SI100AX25S
The AirTAC SI100AX25S is a discontinued double-acting ISO 15552 profile cylinder with a 100 mm bore and 25 mm stroke. It delivers 3927 N push force at 0.5 MPa through a G1/2 port. The direct replacement is the SAI100AX25S, matching the interface, stroke, force, and mounting. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The -A suffix specifies a SUS420J2 stainless steel piston rod for corrosion resistance, while the -S denotes a piston magnet for legacy CS1-B/DS1-B sensors.
Note that a plain cylinder does not hold load without live air; the cushions only decelerate. For load holding, consider the SAIL or BSAI lock variants.
Airtac SI100 Standard Cylinder SI100AX25S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100AX25S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100AX25S |
| 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 SAI100AX25S 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 SAI100AX25S 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 SI100AX25S
| 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 SI100AX25S Is Used
Heavy-Duty Clamping
Secures large steel weldments during machining using the 3927 N push force, with the SUS420J2 stainless rod resisting coolant corrosion.
Pallet Stopping
Halts loaded pallets on conveyor lines; the 25 mm short stroke provides rapid stopping power without occupying excessive machine length.
Replacing the Airtac SI100 Standard Cylinder SI100AX25S with the SAI100AX25S
To replace the discontinued SI100AX25S, order the SAI100AX25S. Verify the ISO 15552 mounting interface, 100 mm bore, 25 mm stroke, G1/2 port, and SUS420J2 stainless rod (-A). The -S magnet enables position sensing; use legacy CS1-B/DS1-B switches or current AirTAC switches on the SAI. If downsizing, an 80 mm bore yields 2513 N push at 0.5 MPa; if upsizing, a 125 mm bore provides 6136 N. For load holding on air loss, select the SAIL (air-released lock) or BSAI (clamp-lock) variant, or use an external pilot check valve. The SAIF variant integrates a 4M valve for bores 32-100.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100AX25S
- ✓ 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 SI100AX25S FAQ
Yes, the AirTAC SI100AX25S is discontinued. The direct replacement is the SAI100AX25S. It is dimensionally interchangeable per ISO 15552, retaining the same 100 mm bore, 25 mm stroke, G1/2 port, and mounting interface. The SAI upgrades the piston seal with two Y-shaped elements for lower start-up pressure and longer life.
This 100 mm bore double-acting cylinder features a G1/2 air port and a 25 mm piston rod. At 0.5 MPa it provides 3927 N push and 3681 N pull force. At 0.7 MPa push is 5497 N, and at 0.9 MPa it is 7068 N. The theoretical maximum force is 801 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100AX25S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100AX25S replacement — usually within 7-8 hours.