This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100BX1250S, 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 SI100BX1250S
The AirTAC Airtac SI100 Standard Cylinder SI100BX1250S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 1250mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100BX1250S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke1250 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100BX1250S
- 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 SI100BX1250S
The AirTAC SI100BX1250S is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore and 1250mm stroke. This legacy unit delivers 3927N push force at 0.5MPa, features a SUS304 stainless steel rod (-B) for corrosion resistance, and includes a piston magnet (-S) for CS1-B/DS1-B sensors. Its G1/2 port and M20x1.5 thread match the standard 100mm class. AirTAC replaced it with the SAI100BX1250S, a direct alternative retaining the exact ISO 15552 mounting interface, bore, stroke, and output force.
The SAI100BX1250S upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. For load holding, note that a plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock or pilot check valve, or explore the SAIL or BSAI lock variants.
Airtac SI100 Standard Cylinder SI100BX1250S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100BX1250S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100BX1250S |
| Bore size | Ø100 mm |
| Stroke | 1250 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 SAI100BX1250S 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 SAI100BX1250S 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 SI100BX1250S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×1250 | 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 SI100BX1250S Is Used
Long-Stroke Material Transfer
Pushes heavy pallets or workpieces across 1250mm gaps on automated lines using 3927N of thrust at 0.5MPa.
Large Fixture Actuation
Actuates oversized clamping fixtures or press beds where a true ISO 15552 mounting footprint and 7068N at 0.9MPa are required.
Replacing the Airtac SI100 Standard Cylinder SI100BX1250S with the SAI100BX1250S
To replace the discontinued SI100BX1250S, order the SAI100BX1250S, confirming the ISO 15552 mounting interface, 100mm bore, 1250mm stroke, G1/2 port (PT/G/NPT), and mounting accessory. The -B SUS304 rod and -S magnet (using legacy CS1-B/DS1-B switches; SAI uses current AirTAC switches) carry over. Sizing both ways: a neighbouring 80mm bore yields 2513N push at 0.5MPa, while a 125mm bore yields 6136N. This 100mm bore provides 3927N push and 3681N pull at 0.5MPa, 5497N at 0.7MPa, and 801kgf max at 1.0MPa. Because the 1250mm stroke exceeds 300mm, use external guides to prevent rod-bending and side-load damage. For dead-load holding, select the SAIL or BSAI lock variant, as standard cushions only decelerate.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100BX1250S
- ✓ 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 SI100BX1250S FAQ
Yes, the SI100BX1250S is discontinued. The direct replacement is the SAI100BX1250S. It shares the identical ISO 15552 mounting interface, 100mm bore, 1250mm stroke, force, G1/2 port, and mounting accessories, fitting existing fixtures perfectly.
The G1/2 port is fixed by the 100mm bore. It delivers 3927N push and 3681N pull at 0.5MPa, 5497N push at 0.7MPa, 7068N at 0.9MPa, and a theoretical max of 801kgf at 1.0MPa. Speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100BX1250S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100BX1250S replacement — usually within 7-8 hours.