This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100BX55, 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 SI100BX55
The AirTAC Airtac SI100 Standard Cylinder SI100BX55 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 55mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100BX55, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke55 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100BX55
- 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 SI100BX55
The AirTAC SI100BX55 is a discontinued double-acting ISO 15552 profile cylinder with a 100 mm bore and 55 mm stroke. It delivers 3927 N push force at 0.5 MPa via a G1/2 port. Because this legacy unit is end-of-life, you should order the direct replacement: the SAI100BX55. It shares the same ISO 15552 mounting interface, stroke, output force and porting, fitting existing fixtures perfectly.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This specific SKU has a SUS304 stainless steel rod (the -B option) for corrosion resistance, but lacks a magnet so it cannot accept position sensors.
Airtac SI100 Standard Cylinder SI100BX55 Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100BX55 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100BX55 |
| Bore size | Ø100 mm |
| Stroke | 55 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 SAI100BX55 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 SAI100BX55 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 SI100BX55
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×55 | 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 SI100BX55 Is Used
Heavy-Duty Stamping
Drives robust pressing actions requiring high force, using the 3927 N push capacity at 0.5 MPa to form or seat heavy components reliably.
Pallet Dispenser
Indexes heavy pallets in automated lines. The SUS304 stainless rod provides corrosion resistance in damp or wash-down logistics environments.
Material Lift Gate
Actuates weighted vertical gates.
Replacing the Airtac SI100 Standard Cylinder SI100BX55 with the SAI100BX55
To replace the discontinued SI100BX55, order the SAI100BX55. Verify your ISO 15552 mounting interface (LB, FA, TC, etc.), the 100 mm bore, 55 mm stroke, and G1/2 port (PT, G or NPT thread). This non-magnetic SKU cannot take a sensor; if you need switches, select an SAI model with the -S magnet option and use current AirTAC switches. Sizing checks: the 100 mm bore yields 3927 N push at 0.5 MPa (80 mm neighbours give 2513 N). Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100BX55
- ✓ 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 SI100BX55 FAQ
Yes, the AirTAC SI100BX55 is discontinued. The direct replacement is the SAI100BX55. It is a current-production ISO 15552 cylinder that maintains the same 100 mm bore, 55 mm stroke, output force, G1/2 port and mounting dimensions, dropping directly into your existing fixtures.
This double-acting cylinder has a G1/2 air port and an M20x1.5 rod thread. Theoretical forces are: 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; with a maximum force of 801 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100BX55
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100BX55 replacement — usually within 7-8 hours.