This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100X250H, 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 SI100X250H
The AirTAC Airtac SI100 Standard Cylinder SI100X250H 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 SAI100X250H, 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 → SAI100X250H
- 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 SI100X250H
The AirTAC SI100X250H is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore and 250mm stroke. This high-temp Viton H seal variant delivered 3927 N push force at 0.5 MPa through a G1/2 port. AirTAC replaced it with the SAI100X250H, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, force, and port.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Because this specific SKU lacks a magnet (-S), it cannot accept position switches. For load holding, note that air cushions only decelerate; use an external rod lock or pilot check valve.
Airtac SI100 Standard Cylinder SI100X250H Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100X250H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100X250H |
| 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 SAI100X250H 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 SAI100X250H 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 SI100X250H
| 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 SI100X250H Is Used
Heavy Stamping Press
Drives heavy-duty stamping and forming dies requiring high thrust, using the 3927 N push force at 0.5 MPa to shape thick metal components reliably.
High-Tact Forming
Ideal for high-temperature molding operations up to 150 C where the Viton H seal option ensures sustained performance without degrading.
Replacing the Airtac SI100 Standard Cylinder SI100X250H with the SAI100X250H
To replace the discontinued SI100X250H, order the SAI100X250H. Confirm the ISO 15552 mounting interface, 100mm bore, 250mm stroke, G1/2 port, and your high-temperature Viton H seal requirement (0-150 C). This non-magnetic SKU cannot take CS1-B/DS1-B sensors; if sensing is needed, specify an SAI with the magnet option. For sizing, the 100mm bore yields 3927 N push at 0.5 MPa; if less force is acceptable, an 80mm bore provides 2513 N. At 250mm stroke, side-load and rod-bending risks are moderate, so ensure proper guide alignment to prevent premature seal wear. The SAI family also adds SAIL (air-released lock), SAIF (built-in 4M valve), and BSAI (clamp-lock) variants the SI lacked.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100X250H
- ✓ 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 SI100X250H FAQ
Yes, the SI100X250H is discontinued. The direct replacement is the SAI100X250H. It features the same ISO 15552 mounting interface, 100mm bore, 250mm stroke, output force, G1/2 port, and mounting accessories, fitting directly into existing fixtures.
This 100mm bore cylinder uses a G1/2 air port. Theoretical forces are: 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; with a maximum force of 801 kgf at 1.0 MPa. It operates at speeds of 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100X250H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100X250H replacement — usually within 7-8 hours.