This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100X250SFA, 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 SI100X250SFA
The AirTAC Airtac SI100 Standard Cylinder SI100X250SFA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 250mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100X250SFA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke250 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100X250SFA
- 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 SI100X250SFA
The AirTAC SI100X250SFA is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore and 250mm stroke. It delivers 3927N push force at 0.5MPa through a G1/2 port. AirTAC replaced this legacy unit with the SAI100X250SFA, a direct upgrade retaining the exact ISO 15552 mounting interface, FA flange, and output force.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. It also adds SAIL, SAIF, and BSAI lock variants absent in the SI line. The -S magnet supports CS1-B/DS1-B sensors, while Viton H seals extend heat to 150C.
Airtac SI100 Standard Cylinder SI100X250SFA Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100X250SFA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100X250SFA |
| Bore size | Ø100 mm |
| Stroke | 250 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 SAI100X250SFA 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 SAI100X250SFA 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 SI100X250SFA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×250 | 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 SI100X250SFA Is Used
Heavy Press Clamping
Ideal for securing heavy fabrication panels during machining, utilising the 3927N push force at 0.5MPa to hold components rigidly against tool vibration.
Pallet Diverting
Drives robust routing gates on high-capacity material handling lines, where the 250mm stroke and FA flange mount provide reliable lateral redirection of loaded pallets.
Replacing the Airtac SI100 Standard Cylinder SI100X250SFA with the SAI100X250SFA
To replace the SI100X250SFA, order the SAI100X250SFA. Confirm the ISO 15552 FA flange mounting, 250mm stroke, G1/2 port, and the -S magnet for legacy CS1-B/DS1-B sensors. Sizing both ways: a neighbouring 80mm bore yields 2513N push at 0.5MPa, while a 125mm bore yields 6136N. At 250mm stroke, ensure guide alignment to prevent rod bending and side-load wear. Note that a plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external pilot check valve, rod lock, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100X250SFA
- ✓ 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 SI100X250SFA FAQ
Yes, the AirTAC SI100X250SFA is discontinued. The direct replacement is the SAI100X250SFA. It shares the identical ISO 15552 mounting interface, 100mm bore, 250mm stroke, G1/2 port, and FA flange, fitting existing fixtures perfectly without modifications.
The 100mm bore provides 3927N push and 3681N pull at 0.5MPa, 5497N push at 0.7MPa, 7068N push at 0.9MPa, and a theoretical max of 801kgf at 1.0MPa. Operating speed is 30-800mm/s. The rod is Ø25mm with an M20x1.5 thread, and it features 36mm adjustable air cushions at both ends.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100X250SFA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100X250SFA replacement — usually within 7-8 hours.