This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100BX275S, 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 SI100BX275S
The AirTAC Airtac SI100 Standard Cylinder SI100BX275S 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 SAI100BX275S, 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 → SAI100BX275S
- 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 SI100BX275S
The AirTAC SI100BX275S is a discontinued double-acting ISO 15552 profile cylinder with a 100 mm bore, 275 mm stroke, and a SUS304 stainless steel piston rod. It generates 3927 N of push force at 0.5 MPa. The direct replacement is the SAI100BX275S, which retains the same G1/2 port, M20x1.5 rod thread, and mounting interface.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. For applications needing load holding, the SAI family adds the SAIL lock and BSAI clamp-lock variants the SI lacked.
Airtac SI100 Standard Cylinder SI100BX275S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100BX275S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100BX275S |
| 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 SAI100BX275S 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 SAI100BX275S 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 SI100BX275S
| 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 SI100BX275S Is Used
Heavy Press Clamping
Secures large steel plates during machining operations using the 3927 N push force, with the SUS304 rod resisting coolant corrosion.
Package Diverters
Drives robust routing arms on high-throughput conveyors, utilizing the 36 mm adjustable air cushions to stop 275 mm strokes smoothly.
Replacing the Airtac SI100 Standard Cylinder SI100BX275S with the SAI100BX275S
To replace the SI100BX275S, order the SAI100BX275S and confirm the ISO 15552 mounting interface, 100 mm bore, 275 mm stroke, G1/2 port, and magnet for position sensing. If downsizing, the 80 mm bore yields 2513 N push at 0.5 MPa; if upsizing, the 125 mm bore provides 6136 N. Since this is a 275 mm stroke, ensure adequate guide support to prevent rod bending under side loads. A standard cylinder drifts on air loss, so for load holding use an external pilot check valve or the SAIL/BSAI lock variants. The original -S magnet works with legacy CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100BX275S
- ✓ 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 SI100BX275S FAQ
Yes, the SI100BX275S is discontinued. The direct replacement is the SAI100BX275S. It is dimensionally interchangeable per ISO 15552, retaining the same 100 mm bore, 275 mm stroke, G1/2 port, and mounting fixtures.
The G1/2 port feeds a 100 mm bore that 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100BX275S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100BX275S replacement — usually within 7-8 hours.