This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100X250SN, 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 SI100X250SN
The AirTAC Airtac SI100 Standard Cylinder SI100X250SN 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 SAI100X250SN, 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 → SAI100X250SN
- 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 SI100X250SN
The AirTAC SI100X250SN is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore and 250mm stroke. It delivers 3927 N push and 3681 N pull at 0.5 MPa through a G1/2 port. The direct replacement is the SAI100X250SN, which maintains the exact same ISO 15552 mounting interface, output force, and dimensions. The SAI upgrade features a redesigned piston seal using two Y-shaped one-way elements for lower start-up pressure and longer life. The -SN configuration includes an NBR seal (-20 to +70 C) and a piston magnet for legacy CS1-B/DS1-B sensors (the SAI uses current AirTAC switches).
If your application requires heat resistance, Viton H seals are available. Note that a standard cylinder cannot hold a load without live air; the cushions only decelerate near stroke end. For secure holding, consider the SAIL lock or BSAI clamp-lock variants.
Airtac SI100 Standard Cylinder SI100X250SN Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100X250SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100X250SN |
| 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 SAI100X250SN 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 SAI100X250SN 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 SI100X250SN
| 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 SI100X250SN Is Used
Heavy Press Clamping
Secures heavy metal workpieces in machining centers, utilizing the 5497 N push force at 0.7 MPa to hold components firmly against cutting forces.
Bulk Material Diverters
Drives large-scale sorting flaps on high-throughput packaging lines, using the 250mm stroke to fully extend diverting arms across wide belts.
Replacing the Airtac SI100 Standard Cylinder SI100X250SN with the SAI100X250SN
To replace the discontinued SI100X250SN, order the SAI100X250SN. Verify your ISO 15552 mounting accessories (LB, FA, TC, etc.), the 250mm stroke, and the G1/2 port. The -S magnet and -N NBR seals carry over directly. If you need higher force, the neighbouring 125mm bore provides 6136 N push at 0.5 MPa; if you need less, the 80mm bore offers 2513 N. For this 250mm stroke, ensure adequate guide support to prevent rod bending and side-load wear. Because a plain cylinder drifts on air loss, use an external pilot check valve or explore the SAIL/BSAI lock variants for load holding. The SAIF variant (bores 32-100) integrates a 4M valve if space is tight.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100X250SN
- ✓ 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 SI100X250SN FAQ
Yes, the SI100X250SN is discontinued. The direct replacement is the SAI100X250SN. It is dimensionally interchangeable per ISO 15552, keeping the same 100mm bore, 250mm stroke, G1/2 port, and mounting interface. The SAI simply upgrades the piston seal to two Y-shaped elements for lower start-up pressure.
This double-acting cylinder has a G1/2 air port and a 25mm piston rod. The thrust 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. It operates at 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100X250SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100X250SN replacement — usually within 7-8 hours.