This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100BX250S, 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 SI100BX250S
The AirTAC Airtac SI100 Standard Cylinder SI100BX250S 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 SAI100BX250S, 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 → SAI100BX250S
- 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 SI100BX250S
The AirTAC SI100BX250S is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore and 250mm stroke. It features a SUS304 stainless piston rod (-B) and a built-in magnet (-S) for CS1-B/DS1-B switches. Delivering 3927 N push force at 0.5 MPa through a G1/2 port, it is replaced by the SAI100BX250S.
The SAI100BX250S is a direct replacement, matching the ISO 15552 mounting interface, bore, stroke, force, and port. It upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life.
Airtac SI100 Standard Cylinder SI100BX250S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100BX250S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100BX250S |
| 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 SAI100BX250S 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 SAI100BX250S 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 SI100BX250S
| 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 SI100BX250S Is Used
Heavy-Duty Pressing
Drives large stamping or forming dies requiring substantial thrust, leveraging the 5497 N push force available at 0.7 MPa.
Material Diversion
Actuates heavy diverter arms on high-throughput packaging lines, using the adjustable 36mm cushions to halt loads smoothly.
Replacing the Airtac SI100 Standard Cylinder SI100BX250S with the SAI100BX250S
To replace the SI100BX250S, order the SAI100BX250S. Confirm the ISO 15552 mounting interface, the 100mm bore, 250mm stroke, G1/2 port, and your mounting accessory. The -B denotes a SUS304 stainless rod, and -S means the magnet is present for CS1-B/DS1-B sensors. If sizing down, an 80mm bore yields 2513 N push at 0.5 MPa; sizing up to 125mm gives 6136 N. A plain cylinder drifts on air loss—the cushion only decelerates—so use a pilot check valve or the SAIL/BSAI lock variant for load holding. At 250mm stroke, guide external rods to prevent side-load bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100BX250S
- ✓ 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 SI100BX250S FAQ
Yes, the SI100BX250S is discontinued. The direct replacement is the SAI100BX250S. It shares the identical ISO 15552 mounting interface, 100mm bore, 250mm stroke, output force, G1/2 port, and SUS304 rod, fitting existing fixtures perfectly.
It has a G1/2 port. 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 max of 801 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100BX250S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100BX250S replacement — usually within 7-8 hours.