This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100X312S, 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 SI100X312S
The AirTAC Airtac SI100 Standard Cylinder SI100X312S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 312mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100X312S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke312 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100X312S
- 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 SI100X312S
The AirTAC SI100X312S is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore and 312mm stroke. It delivers 3927N push force at 0.5MPa via a G1/2 port. AirTAC replaced this legacy unit with the SAI100X312S, a direct upgrade retaining the exact ISO 15552 mounting interface, stroke, and output force.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. It also adds SAIL, SAIF, and BSAI lock variants the SI lacked. The S suffix denotes a piston magnet for CS1-B/DS1-B switches.
Airtac SI100 Standard Cylinder SI100X312S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100X312S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100X312S |
| Bore size | Ø100 mm |
| Stroke | 312 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 SAI100X312S 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 SAI100X312S 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 SI100X312S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×312 | 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 SI100X312S Is Used
Heavy Material Diversion
Actuates large deflectors or pushers on high-capacity packaging lines to route heavy pallets or bulk containers.
Pallet Positioning
Provides the extended reach and 3927N force needed to index loaded pallets into strapping or wrapping stations.
Press Ejection
Ejects dense formed parts from machining centers, utilizing the full 312mm stroke to clear the work envelope safely.
Replacing the Airtac SI100 Standard Cylinder SI100X312S with the SAI100X312S
To replace the SI100X312S, order the SAI100X312S. Confirm the ISO 15552 mounting interface (LB, FA, TC, etc.), the G1/2 port, and the magnet. Sizing both ways: a neighbouring 80mm bore yields 2513N [email protected], while a 125mm bore yields 6136N. At 0.7MPa this 100mm bore pushes 5497N. Note that 312mm is a nonstandard stroke exceeding standard increments, and at this length you must account for side-load and rod-bending by using external guides to prevent premature wear. A plain cylinder drifts on air loss; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100X312S
- ✓ 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 SI100X312S FAQ
Yes, the SI100X312S is discontinued. The direct replacement is the AirTAC SAI100X312S. It shares the same ISO 15552 mounting interface, 100mm bore, 312mm stroke, force, and G1/2 port, fitting existing fixtures perfectly.
This double-acting cylinder uses a G1/2 port. It generates 3927N push and 3681N pull at 0.5MPa, 5497N push at 0.7MPa, 7068N push at 0.9MPa, and a theoretical max of 801kgf at 1.0MPa. The 312mm stroke is nonstandard.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100X312S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100X312S replacement — usually within 7-8 hours.