This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100BX55S, 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 SI100BX55S
The AirTAC Airtac SI100 Standard Cylinder SI100BX55S 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 SAI100BX55S, 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 → SAI100BX55S
- 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 SI100BX55S
The AirTAC SI100BX55S is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore and 55mm stroke. It delivers 3927N push force at 0.5MPa. The direct replacement is the SAI100BX55S, which retains the identical ISO 15552 mounting interface, G1/2 port, and M20x1.5 rod thread. This B-suffix variant features a SUS304 stainless piston rod for corrosion resistance, and the S suffix provides a piston magnet for legacy CS1-B/DS1-B sensors.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. Note that a plain cylinder drifts on air loss; the cushion only decelerates. For load holding, consider the SAIL lock or BSAI clamp-lock variants.
Airtac SI100 Standard Cylinder SI100BX55S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100BX55S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100BX55S |
| 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 SAI100BX55S 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 SAI100BX55S 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 SI100BX55S
| 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 SI100BX55S Is Used
Heavy Stamping
Drives large press dies and stamping fixtures requiring high push force up to 3927N at 0.5MPa.
Pallet Diversion
Actuates heavy-duty pallet stops and routing gates on high-capacity material handling lines.
Replacing the Airtac SI100 Standard Cylinder SI100BX55S with the SAI100BX55S
To replace the SI100BX55S, order the SAI100BX55S. It is dimensionally interchangeable per the ISO 15552 mounting interface, matching the 100mm bore, 55mm stroke, G1/2 port, and SUS304 rod. Confirm your mounting accessory (LB, FA, TC, etc.) and that the magnet is required. If sizing both ways, neighboring bores (80mm or 125mm) alter the 3927N @0.5MPa force class. Remember that standard cylinders do not hold load without live air; the air cushion only decelerates. For held loads, use an external pilot check valve or explore the SAIL air-released lock and BSAI clamp-lock variants. The SAIF variant (bores 32-100) integrates a 4M valve if space is tight.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100BX55S
- ✓ 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 SI100BX55S FAQ
Yes, the SI100BX55S is discontinued. The direct replacement is the SAI100BX55S. It shares the identical ISO 15552 mounting interface, 100mm bore, 55mm stroke, force, G1/2 port, and SUS304 stainless rod, fitting existing fixtures perfectly.
The 100mm bore features a G1/2 air port and M20x1.5 rod thread. Force ratings are: push 3927N and pull 3681N at 0.5MPa; push 5497N at 0.7MPa; push 7068N at 0.9MPa; with a theoretical max of 801kgf at 1.0MPa. Speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100BX55S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100BX55S replacement — usually within 7-8 hours.