This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100X312SN, 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 SI100X312SN
The AirTAC Airtac SI100 Standard Cylinder SI100X312SN 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 SAI100X312SN, 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 → SAI100X312SN
- 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 SI100X312SN
The AirTAC SI100X312SN is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore and 312mm stroke. It delivers 3927N push and 3681N pull at 0.5MPa via a G1/2 port. AirTAC replaced this legacy unit with the SAI100X312SN, a direct upgrade retaining the exact interface, stroke, force and mounts. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life.
This unit includes a piston magnet for CS1-B/DS1-B switches and an NBR seal (-20 to +70C; Viton H raises this to 150C). The 312mm stroke exceeds standard increments, requiring external guides to prevent rod bending. Note that plain cylinders drift without live air; use SAIL or BSAI lock variants for holding.
Airtac SI100 Standard Cylinder SI100X312SN Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100X312SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100X312SN |
| 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 SAI100X312SN 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 SAI100X312SN 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 SI100X312SN
| 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 SI100X312SN Is Used
Heavy Pressing
Applies 3927N of thrust at 0.5MPa for seating bearings or forming light components in automated machinery.
Pallet Diverting
Uses the 312mm stroke to push heavy pallets off a main conveyor line, requiring external guides to absorb side loads.
Replacing the Airtac SI100 Standard Cylinder SI100X312SN with the SAI100X312SN
To replace the SI100X312SN, order the SAI100X312SN. Confirm the ISO 15552 mounting interface (foot, flange, clevis, trunnion), the G1/2 port, and the magnet (-S). The SAI family adds SAIL, SAIF, and BSAI lock/valve variants the SI lacked. Because the 312mm stroke is non-standard and exceeds 300mm, use external guides to prevent rod bending under side loads. For sizing both ways: the 100mm bore yields 3927N push at 0.5MPa, while an 80mm bore yields 2513N. A plain cylinder does not hold load without live air; the cushion only decelerates. For load holding, specify an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100X312SN
- ✓ 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 SI100X312SN FAQ
Yes, the SI100X312SN is discontinued. The direct replacement is the SAI100X312SN. It is dimensionally interchangeable per ISO 15552, keeping the same 100mm bore, 312mm stroke, G1/2 port, and mounting accessories.
The G1/2 port supplies 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. It uses a 25mm rod and 36mm adjustable cushions.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100X312SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100X312SN replacement — usually within 7-8 hours.