This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100BX425, 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 SI100BX425
The AirTAC Airtac SI100 Standard Cylinder SI100BX425 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 425mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100BX425, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke425 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100BX425
- 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 SI100BX425
The AirTAC SI100BX425 is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore and 425mm stroke. It delivers 3927 N push force at 0.5 MPa. The direct replacement is the SAI100BX425, which matches the exact ISO 15552 mounting interface, bore, stroke, force, G1/2 port, and accessories.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. It also adds SAIL, SAIF, and BSAI variants the SI lacked. This SKU has a SUS304 stainless rod (B) but no magnet, so it cannot take a sensor.
Airtac SI100 Standard Cylinder SI100BX425 Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100BX425 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100BX425 |
| Bore size | Ø100 mm |
| Stroke | 425 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 SAI100BX425 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 SAI100BX425 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 SI100BX425
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×425 | 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 SI100BX425 Is Used
Heavy Press Clamping
Applies the 5497 N push force at 0.7 MPa to secure heavy metal components during machining or stamping operations.
Vertical Load Lowering
Manages the controlled descent of approximately 200 kg payloads, relying on external guides for the 425mm stroke.
Pallet Diversion
Actuates heavy-duty routing gates on assembly lines, utilizing the G1/2 port for high-volume air flow.
Replacing the Airtac SI100 Standard Cylinder SI100BX425 with the SAI100BX425
To replace this SI100BX425, order the SAI100BX425 keeping the identical ISO 15552 mounting, 425mm stroke, G1/2 port, and SUS304 rod. If sizing down, a 80mm bore yields 2513 N push at 0.5 MPa; sizing up to 125mm provides 6136 N. This non-magnet SKU cannot accept position switches. Because the 425mm stroke is long, use external guides to prevent rod-bending side loads. 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 → SAI100BX425
- ✓ 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 SI100BX425 FAQ
Yes, the SI100BX425 is discontinued. The direct replacement is the SAI100BX425. It is dimensionally interchangeable per ISO 15552, matching the 100mm bore, 425mm stroke, force, G1/2 port, and mounting fixtures.
This double-acting cylinder has a G1/2 port. It generates 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 max of 801 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100BX425
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100BX425 replacement — usually within 7-8 hours.