This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100X275STC, 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 SI100X275STC
The AirTAC Airtac SI100 Standard Cylinder SI100X275STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 275mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100X275STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke275 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100X275STC
- 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 SI100X275STC
The AirTAC SI100X275STC is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore, 275mm stroke, TC trunnion mount, and a piston magnet. Delivering 3927 N push force at 0.5 MPa through a G1/2 port, it is replaced by the SAI100X275STC. This direct upgrade shares the exact ISO 15552 mounting interface, bore, stroke, force, port, and TC accessory, fitting existing fixtures perfectly.
The SAI replacement introduces an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The original -S magnet supports legacy CS1-B/DS1-B sensors, while the SAI family adds SAIL, SAIF, and BSAI lock variants the SI lacked.
Airtac SI100 Standard Cylinder SI100X275STC Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100X275STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100X275STC |
| Bore size | Ø100 mm |
| Stroke | 275 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 SAI100X275STC 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 SAI100X275STC 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 SI100X275STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×275 | 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 SI100X275STC Is Used
Heavy-Duty Pressing
Applies the 5497 N push force at 0.7 MPa to seat bearings or assemble heavy mechanical components securely.
Pallet Diverting
Uses the TC trunnion mount and 275mm stroke to push heavy pallets smoothly across high-throughput packaging lines.
Replacing the Airtac SI100 Standard Cylinder SI100X275STC with the SAI100X275STC
To replace the SI100X275STC, order the SAI100X275STC. Verify your ISO 15552 TC trunnion interface, 100mm bore, 275mm stroke, G1/2 port, and the -S magnet. Because 275mm is a nonstandard stroke, ensure your TC mount allows for the exact rod extension. Sizing both ways: a neighboring 80mm bore yields 2513 N push at 0.5 MPa, while a 125mm bore yields 6136 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock or pilot check valve for load holding. For strokes over 300mm, guide the load to prevent rod bending, though this 275mm unit is just under that threshold.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100X275STC
- ✓ 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 SI100X275STC FAQ
Yes, the SI100X275STC is discontinued. The direct replacement is the SAI100X275STC. It is dimensionally interchangeable per ISO 15552, retaining the same 100mm bore, 275mm stroke, G1/2 port, TC mount, and output force.
The 100mm bore delivers 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, and a maximum theoretical force of 801 kgf at 1.0 MPa. Operating speed is 30-800 mm/s. It uses a G1/2 port and M20x1.5 rod thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100X275STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100X275STC replacement — usually within 7-8 hours.