This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100BX275, 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 SI100BX275
The AirTAC Airtac SI100 Standard Cylinder SI100BX275 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 SAI100BX275, 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 → SAI100BX275
- 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 SI100BX275
The AirTAC SI100BX275 is a discontinued double-acting ISO 15552 profile cylinder with a 100 mm bore and 275 mm stroke. It delivers 3927 N push force at 0.5 MPa through a G1/2 port. The direct replacement is the SAI100BX275, matching the interface, stroke and force exactly.
This SKU lacks a magnet, so it cannot accept a sensor. The SAI upgrade uses two Y-shaped piston seals for low start-up pressure. For corrosion resistance, this -B variant uses a SUS304 rod.
Airtac SI100 Standard Cylinder SI100BX275 Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100BX275 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100BX275 |
| 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 SAI100BX275 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 SAI100BX275 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 SI100BX275
| 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 SI100BX275 Is Used
Heavy Press Clamping
Ideal for holding heavy workpieces in machining fixtures, utilizing the 3927 N push force at 0.5 MPa to secure parts against cutting loads.
Pallet Lift Stations
Drives vertical lifts in packaging lines, where the SUS304 rod offers corrosion resistance and the 275 mm stroke moves goods efficiently between elevations.
Sorting Diverter
Actuates heavy diverter arms on conveyor belts, providing reliable 30-800 mm/s speed and robust 100 mm bore power for high-throughput logistics.
Replacing the Airtac SI100 Standard Cylinder SI100BX275 with the SAI100BX275
To replace the SI100BX275, order the SAI100BX275. Confirm the ISO 15552 mounting interface, G1/2 port, and 275 mm stroke. This non-magnet SKU cannot take a sensor; if sensing is needed, order an SAI with the -S suffix for CS1-B/DS1-B switches. Sizing options: stepping down to an 80 mm bore yields 2513 N push @0.5 MPa, while a 125 mm bore gives 6136 N. Note that a plain cylinder drifts on air loss; for load holding, use the SAIL lock or BSAI clamp-lock variant. At 275 mm stroke, ensure guide alignment to prevent rod bending side-loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100BX275
- ✓ 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 SI100BX275 FAQ
Yes, the SI100BX275 is discontinued. The direct replacement is the SAI100BX275. It is dimensionally interchangeable per ISO 15552, keeping the same 100 mm bore, 275 mm stroke, G1/2 port, and mounting interface.
The air port is G1/2. 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 SAI100BX275
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100BX275 replacement — usually within 7-8 hours.