This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100X1250STC, 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 SI100X1250STC
The AirTAC Airtac SI100 Standard Cylinder SI100X1250STC 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 SAI100X1250STC, 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 → SAI100X1250STC
- 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 SI100X1250STC
The AirTAC SI100X1250STC is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore and 1250mm stroke. Delivering 3927 N push at 0.5 MPa via a G1/2 port, it is replaced by the direct replacement SAI100X1250STC, which shares the exact TC trunnion mounting, M20x1.5 thread and dimensions.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure, and introduces SAIL, SAIF and BSAI variants the SI lacked. With a 1250mm stroke, use external guides to prevent rod bending.
Airtac SI100 Standard Cylinder SI100X1250STC Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100X1250STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100X1250STC |
| 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 SAI100X1250STC 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 SAI100X1250STC 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 SI100X1250STC
| 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 SI100X1250STC Is Used
Long-Stroke Material Transfer
Drives heavy pallets across extended conveyor sections where the 5497 N force at 0.7 MPa and 1250mm travel shift substantial loads between machining stations.
Large Press Ejection
Ejects formed components from heavy industrial presses, using the TC trunnion mount to accommodate the long 1250mm rod extension without fixture binding.
Replacing the Airtac SI100 Standard Cylinder SI100X1250STC with the SAI100X1250STC
To replace the SI100X1250STC, order the SAI100X1250STC. Verify the ISO 15552 TC trunnion interface, 100mm bore, 1250mm stroke, G1/2 port (PT/G/NPT) and the -S magnet for CS1-B/DS1-B switches (SAI uses current AirTAC switches). Sizing both ways: a neighbouring 80mm bore yields 2513 N [email protected], while this 100mm bore provides 5497 N at 0.7 MPa. For this 1250mm stroke, add external guides to manage side-load and rod-bending. The air cushion only decelerates; it does not hold load. For load holding on air loss, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. Rod materials include carbon steel, SUS420J2 (A) or SUS304 (B); Viton H seals raise temperature to 150 C.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100X1250STC
- ✓ 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 SI100X1250STC FAQ
Yes, the SI100X1250STC is discontinued. The direct replacement is the SAI100X1250STC. It is dimensionally interchangeable per ISO 15552, retaining the same 100mm bore, 1250mm stroke, G1/2 port, TC trunnion mount and output force, so it fits existing fixtures directly.
It is a double-acting cylinder with a 25mm rod, M20x1.5 thread, 36mm adjustable cushions, and operates at 30-800 mm/s. Force ratings are: 3927 N push and 3681 N pull at 0.5 MPa, 5497 N push at 0.7 MPa, 7068 N at 0.9 MPa, and a maximum theoretical force of 801 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100X1250STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100X1250STC replacement — usually within 7-8 hours.