This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100X275S, 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 SI100X275S
The AirTAC Airtac SI100 Standard Cylinder SI100X275S 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 SAI100X275S, 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 → SAI100X275S
- 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 SI100X275S
The AirTAC SI100X275S is a discontinued double-acting ISO 15552 profile cylinder with a 100 mm bore and 275 mm stroke. It delivers a push force of 3927 N and pull of 3681 N at 0.5 MPa, utilizing a G1/2 port and M20x1.5 rod thread. The direct replacement is the SAI100X275S, which matches the exact ISO 15552 mounting interface, bore, stroke, output force, and port size.
The SAI upgrade features a revised piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The SAI family also introduces SAIL, SAIF, and BSAI lock variants absent in the legacy line. This SI100X275S includes a magnet for CS1-B/DS1-B sensors, whereas the SAI uses current AirTAC switches.
Airtac SI100 Standard Cylinder SI100X275S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100X275S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100X275S |
| 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 SAI100X275S 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 SAI100X275S 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 SI100X275S
| 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 SI100X275S Is Used
Heavy Press Clamping
Secures heavy fabrication assemblies during machining, utilizing the 3927 N push force at 0.5 MPa to hold components firmly against the fixture.
Pallet Diverting
Actuates large diverters on high-capacity packaging lines, where the 275 mm stroke provides the reach needed to redirect fully loaded pallets.
Replacing the Airtac SI100 Standard Cylinder SI100X275S with the SAI100X275S
To replace the SI100X275S, order the SAI100X275S. Confirm the ISO 15552 mounting interface (LB, FA, CA, TC, etc.), the 275 mm stroke, the G1/2 port, and the -S magnet requirement. The SAI accepts current AirTAC switches instead of the legacy CS1-B/DS1-B set. If sizing both ways, neighboring bores offer different force classes: an 80 mm bore provides 2513 N push at 0.5 MPa, while a 125 mm bore yields 6136 N. Because this stroke is 275 mm, ensure adequate guide support to prevent rod bending and side loads. A plain cylinder drifts on air loss; for load holding, use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100X275S
- ✓ 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 SI100X275S FAQ
Yes, the SI100X275S is discontinued. The direct replacement is the SAI100X275S. It is dimensionally interchangeable per ISO 15552, retaining the same 100 mm bore, 275 mm stroke, force, G1/2 port, and mounting accessories.
The 100 mm bore features a G1/2 port. At 0.5 MPa it provides 3927 N push and 3681 N pull force. At 0.7 MPa push 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 SAI100X275S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100X275S replacement — usually within 7-8 hours.