This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100X255S, 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 SI100X255S
The AirTAC SI100 Standard Cylinder SI100X255S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 255mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100X255S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke255 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100X255S
- 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 SI100X255S
The AirTAC SI100X255S is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore and 255mm stroke. It delivers 3927N push force at 0.5MPa via a G1/2 port. The direct replacement is the SAI100X255S, matching the exact ISO 15552 mounting interface, stroke and force.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family adds SAIL, SAIF and BSAI lock variants the SI lacked. Your -S model has a magnet for CS1-B/DS1-B sensors.
Airtac SI100 Standard Cylinder SI100X255S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100X255S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100X255S |
| Bore size | Ø100 mm |
| Stroke | 255 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 SAI100X255S 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 SAI100X255S 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 SI100X255S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×255 | 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 SI100X255S Is Used
Heavy Press Clamping
Ideal for applying 3927N of clamping force at 0.5MPa to secure heavy fabrication components during machining or welding processes.
Package Diverting
The 255mm stroke moves large cartons or heavy totes across high-speed conveyor belts with smooth adjustable air cushion deceleration.
Replacing the Airtac SI100 Standard Cylinder SI100X255S with the SAI100X255S
To replace the SI100X255S, order the SAI100X255S. Confirm the ISO 15552 mounting accessory (LB, FA, CA, TC), the G1/2 port, and the -S magnet for current AirTAC switches. Size both ways: the 80mm bore yields 2513N [email protected], while the 125mm yields 6136N. At 255mm stroke, add a guide to prevent rod bending and side-load wear. The plain cylinder does not hold load on air loss; for static holding use the SAIL or BSAI lock variant, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100X255S
- ✓ 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 SI100X255S FAQ
Yes, the SI100X255S is discontinued. The direct replacement is the SAI100X255S. It is dimensionally interchangeable per ISO 15552, retaining the same 100mm bore, 255mm stroke, G1/2 port and mounting interface.
This double-acting cylinder uses a G1/2 port. It delivers a push force of 3927N and pull of 3681N at 0.5MPa, 5497N push at 0.7MPa, 7068N at 0.9MPa, and a theoretical max of 801kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100X255S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100X255S replacement — usually within 7-8 hours.