This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100X250N, 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 SI100X250N
The AirTAC SI100 Standard Cylinder SI100X250N 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 SAI100X250N, 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 → SAI100X250N
- 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 SI100X250N
The AirTAC SI100X250N is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore and 250mm stroke. It delivers 3927 N push force at 0.5 MPa through a G1/2 port. The direct replacement is the SAI100X250N, sharing the exact interface, stroke and force.
This SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. The SI line lacked SAIL lock, SAIF valve and BSAI clamp variants. With no -S suffix, this SKU cannot take a sensor.
Airtac SI100 Standard Cylinder SI100X250N Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100X250N |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100X250N |
| 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 SAI100X250N 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 SAI100X250N 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 SI100X250N
| 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 SI100X250N Is Used
Heavy-Duty Pressing
Applies 3927 N at 0.5 MPa for seating bearings and forming components in automated assembly lines.
Material Diversion
Handles robust diverting arms on high-throughput conveyors using the 250mm stroke to clear pallets.
Replacing the Airtac SI100 Standard Cylinder SI100X250N with the SAI100X250N
To replace the SI100X250N, order the SAI100X250N. Confirm the ISO 15552 mounting interface, 250mm stroke, G1/2 port (PT/G/NPT threads) and NBR seals (-20 to +70 C). The NBR seal lacks a magnet, so no CS1-B/DS1-B sensor can be fitted. For sizing, a 100mm bore yields 3927 N push at 0.5 MPa; dropping to an 80mm bore gives 2513 N, while a 125mm bore offers 6136 N. Air cushions only decelerate; for load holding on air loss, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. At 250mm stroke, side-load risks are low, but ensure guide alignment to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100X250N
- ✓ 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 SI100X250N FAQ
Yes, the SI100X250N is discontinued. The direct replacement is the SAI100X250N. It is dimensionally interchangeable per ISO 15552, retaining the same 100mm bore, 250mm stroke, force, G1/2 port and mounting interface.
This double-acting cylinder uses a G1/2 port. Force output is 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 SAI100X250N
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100X250N replacement — usually within 7-8 hours.