This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100BX280S, 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 SI100BX280S
The AirTAC Airtac SI100 Standard Cylinder SI100BX280S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 280mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100BX280S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke280 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100BX280S
- 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 SI100BX280S
The AirTAC SI100BX280S is a discontinued double-acting ISO 15552 profile cylinder with a 100 mm bore and 280 mm stroke. Built with an extruded aluminum barrel and a SUS304 stainless piston rod, it delivers 3927 N push force at 0.5 MPa through its G1/2 port. The direct replacement is the SAI100BX280S, matching the exact ISO 15552 mounting interface, stroke, force, and port size.
The SAI upgrade features an improved piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. The original SI-S magnet supports legacy CS1-B/DS1-B sensors, while the SAI family expands options with SAIL lock, SAIF valve, and BSAI clamp-lock variants.
Airtac SI100 Standard Cylinder SI100BX280S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100BX280S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100BX280S |
| Bore size | Ø100 mm |
| Stroke | 280 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 SAI100BX280S 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 SAI100BX280S 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 SI100BX280S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×280 | 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 SI100BX280S Is Used
Heavy-Duty Pressing
Applies 3927 N of push force at 0.5 MPa to seat bearings, stake metal panels, or form light-gauge components in automated machinery.
Pallet Diversion
Uses the 280 mm stroke to push heavy product pallets off a main conveyor line onto a secondary packaging spur.
Replacing the Airtac SI100 Standard Cylinder SI100BX280S with the SAI100BX280S
To replace the discontinued SI100BX280S, order the SAI100BX280S. Confirm the ISO 15552 mounting interface, the 100 mm bore, 280 mm stroke, G1/2 port, and the -S magnet for current AirTAC switches. When sizing, consider neighboring bores: an 80 mm bore yields 2513 N push at 0.5 MPa, while a 125 mm bore yields 6136 N. Note that a standard cylinder does not hold load on air loss; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. Since the 280 mm stroke exceeds 300 mm? No, but for any stroke approaching this length, ensure adequate guide support to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100BX280S
- ✓ 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 SI100BX280S FAQ
Yes, the SI100BX280S is discontinued. The direct replacement is the SAI100BX280S. It is dimensionally interchangeable per ISO 15552, maintaining the same 100 mm bore, 280 mm stroke, G1/2 port, and mounting interface.
The G1/2 port 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 theoretical maximum of 801 kgf at 1.0 MPa. It operates at 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100BX280S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100BX280S replacement — usually within 7-8 hours.