This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100BX250, 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 SI100BX250
The AirTAC Airtac SI100 Standard Cylinder SI100BX250 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 250mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100BX250, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke250 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100BX250
- 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 SI100BX250
The AirTAC SI100BX250 is a discontinued double-acting ISO 15552 profile cylinder with a 100 mm bore and 250 mm stroke. Delivering 3927 N push and 3681 N pull at 0.5 MPa via a G1/2 port, it is replaced by the SAI100BX250. This direct upgrade shares the exact ISO 15552 mounting interface, bore, stroke, force, port and accessories, fitting existing fixtures perfectly.
The SAI upgrade features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This specific SKU uses a SUS304 stainless steel rod (B option) for corrosion resistance, but lacks a magnet so it cannot take a sensor. The family also adds SAIL and BSAI lock variants the SI lacked.
Airtac SI100 Standard Cylinder SI100BX250 Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100BX250 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100BX250 |
| Bore size | Ø100 mm |
| Stroke | 250 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 SAI100BX250 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 SAI100BX250 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 SI100BX250
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×250 | 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 SI100BX250 Is Used
Heavy-Duty Pressing
Drives large stamping and pressing fixtures requiring substantial reach, utilizing the 250 mm stroke and 5497 N push force at 0.7 MPa.
Pallet Dispensing
Actuates heavy pallet handling mechanisms where the 100 mm bore and SUS304 stainless rod resist moisture and provide high thrust.
Bulk Material Diverting
Pushes heavy product loads across high-capacity conveyor lines, relying on the 801 kgf maximum theoretical force for stubborn jams.
Replacing the Airtac SI100 Standard Cylinder SI100BX250 with the SAI100BX250
To replace the SI100BX250, order the SAI100BX250. Verify the ISO 15552 mounting interface, the 100 mm bore, the 250 mm stroke, the G1/2 port (PT/G/NPT thread options), and your specific mounting accessory. Because this is the -B variant, confirm the SUS304 stainless steel piston rod for corrosion resistance. Note that this SKU has no magnet (-S) and therefore cannot accept a CS1-B or DS1-B sensor; if position sensing is required, switch to an SAI100X250S equivalent. For sizing alternatives, a neighbouring 80 mm bore yields 2513 N push at 0.5 MPa, while a 125 mm bore provides 6136 N. A plain cylinder does not hold load on air loss; the cushion only decelerates. For load holding, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100BX250
- ✓ 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 SI100BX250 FAQ
Yes, the AirTAC SI100BX250 is discontinued. The direct replacement is the SAI100BX250. It shares the same ISO 15552 mounting interface, 100 mm bore, 250 mm stroke, output force, G1/2 port, and SUS304 stainless rod, fitting directly into your existing fixtures.
This double-acting cylinder features a G1/2 port and provides 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 force of 801 kgf at 1.0 MPa. The operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100BX250
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100BX250 replacement — usually within 7-8 hours.