This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100X1250S, 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 SI100X1250S
The AirTAC Airtac SI100 Standard Cylinder SI100X1250S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 1250mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100X1250S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke1250 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100X1250S
- 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 SI100X1250S
The AirTAC SI100X1250S is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore and 1250mm stroke. It delivers a push force of 3927 N at 0.5 MPa using a G1/2 port. AirTAC replaced this legacy unit with the SAI100X1250S, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, force, and port size. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life.
The -S suffix indicates a built-in piston magnet for legacy CS1-B/DS1-B sensors. The SAI family also introduces lock and valve variants (SAIL, SAIF, BSAI) absent in the original SI line.
Airtac SI100 Standard Cylinder SI100X1250S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100X1250S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100X1250S |
| Bore size | Ø100 mm |
| Stroke | 1250 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 SAI100X1250S 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 SAI100X1250S 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 SI100X1250S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×1250 | 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 SI100X1250S Is Used
Long-Stroke Material Transfer
Drives heavy pallets across extended conveyor sections, utilizing the 1250mm stroke to shift large workpieces between machining stations.
Automated Assembly Line Indexing
Pushes heavy automotive sub-assemblies down the production line, relying on the 3927 N thrust at 0.5 MPa to overcome rolling friction.
Replacing the Airtac SI100 Standard Cylinder SI100X1250S with the SAI100X1250S
To replace the SI100X1250S, order the SAI100X1250S direct equivalent, confirming the ISO 15552 interface, 100mm bore, 1250mm stroke, G1/2 port, and mounting accessory. The SAI uses current AirTAC switches for the -S magnet. When sizing, neighboring bores offer different force classes: an 80mm bore provides 2513 N push at 0.5 MPa, while a 125mm bore yields 6136 N. A plain cylinder does not hold load on air loss; the air cushion only decelerates near stroke end. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. Because the 1250mm stroke is long, prevent rod bending and side-load damage by using external guides to support the load.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100X1250S
- ✓ 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 SI100X1250S FAQ
Yes, the AirTAC SI100X1250S is discontinued. The direct replacement is the SAI100X1250S. It is dimensionally interchangeable per ISO 15552, matching the 100mm bore, 1250mm stroke, output force, G1/2 port, and mounting fixtures.
This double-acting cylinder features a G1/2 air port. It delivers a push force of 3927 N and a pull force of 3681 N at 0.5 MPa. At 0.7 MPa the push force 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 SAI100X1250S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100X1250S replacement — usually within 7-8 hours.