This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100BX400S, 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 SI100BX400S
The AirTAC Airtac SI100 Standard Cylinder SI100BX400S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 400mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100BX400S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke400 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100BX400S
- 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 SI100BX400S
The AirTAC SI100BX400S is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore, 400mm stroke, and a SUS304 stainless steel rod. Delivering 3927 N push force at 0.5 MPa via a G1/2 port, it is replaced by the SAI100BX400S. This direct upgrade shares the exact ISO 15552 mounting interface, bore, stroke, and force. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life.
The -S magnet works with legacy CS1-B/DS1-B sensors. The SAI family also introduces SAIL, SAIF, and BSAI lock variants absent in the SI line.
Airtac SI100 Standard Cylinder SI100BX400S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100BX400S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100BX400S |
| Bore size | Ø100 mm |
| Stroke | 400 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 SAI100BX400S 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 SAI100BX400S 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 SI100BX400S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×400 | 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 SI100BX400S Is Used
Heavy Press Clamping
Secures large metal castings during machining operations, utilizing the 3927 N push force and 400 mm travel to accommodate thick workpieces.
Pallet Diversion
Actuates heavy-duty diverter arms on conveyor lines, where the SUS304 rod provides corrosion resistance in humid washdown environments.
Material Lowering
Controls the descent of 200 kg material lifts, relying on adjustable air cushions to smoothly decelerate the load near the end of the stroke.
Replacing the Airtac SI100 Standard Cylinder SI100BX400S with the SAI100BX400S
To replace the SI100BX400S, order the SAI100BX400S. Confirm the ISO 15552 mounting interface, the 100mm bore, 400mm stroke, G1/2 port, and your specific mounting accessory. The -B suffix denotes the SUS304 stainless rod, and -S indicates the magnet for CS1-B/DS1-B switches. If sizing up or down, neighboring bores (80mm or 125mm) alter the 0.5 MPa push force (2513 N or 6136 N). Note that a plain cylinder drifts without live air; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. At 400mm stroke, use external guides to prevent rod bending and side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100BX400S
- ✓ 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 SI100BX400S FAQ
Yes, the SI100BX400S is discontinued. The direct replacement is the SAI100BX400S. It is dimensionally interchangeable per ISO 15552, maintaining the same 100mm bore, 400mm stroke, force, G1/2 port, and mounting interface.
It features a G1/2 air port. The force ratings 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, and a theoretical maximum of 801 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100BX400S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100BX400S replacement — usually within 7-8 hours.