This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100X840, 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 SI100X840
The AirTAC Airtac SI100 Standard Cylinder SI100X840 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 840mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100X840, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke840 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100X840
- 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 SI100X840
The AirTAC SI100X840 is a discontinued double-acting ISO 15552 profile cylinder with an 840 mm stroke and a 100 mm bore. It delivers 3927 N push and 3681 N pull at 0.5 MPa, utilizing a G1/2 port and M20x1.5 rod thread. Because this SKU lacks a magnet, it cannot accept position switches.
The factory replacement is the SAI100X840, a direct retaining the exact ISO 15552 mounting interface, bore, stroke, force, and port. The SAI upgrades the piston seal to two Y-shaped one-way elements for low start-up pressure and long life.
Airtac SI100 Standard Cylinder SI100X840 Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100X840 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100X840 |
| Bore size | Ø100 mm |
| Stroke | 840 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 SAI100X840 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 SAI100X840 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 SI100X840
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×840 | 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 SI100X840 Is Used
Pallet Diversion
Pushes heavy pallets sideways onto parallel conveyor lines using the 3927 N push force at 0.5 MPa over the 840 mm travel.
Large Press Ejection
Ejects formed metal parts from a 100-ton press, relying on the 3681 N pull force and 36 mm adjustable cushions.
Replacing the Airtac SI100 Standard Cylinder SI100X840 with the SAI100X840
To replace the SI100X840, order the SAI100X840 and confirm your ISO 15552 mounting accessories (LB, FA, TC, etc.), bore, 840 mm stroke, and G1/2 port match. If you need position sensing, select an SAI100X840S instead, as this no-magnet SKU cannot take a switch. For load holding, note that a standard cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. At 840 mm, prevent rod bending by guiding the load externally. If downsizing, an 80 mm bore gives 2513 N push at 0.5 MPa; if upsizing, a 125 mm bore yields 6136 N.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100X840
- ✓ 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 SI100X840 FAQ
Yes, the SI100X840 is discontinued. The direct replacement is the SAI100X840. It shares the identical ISO 15552 mounting interface, 100 mm bore, 840 mm stroke, output force, and G1/2 port, fitting directly into existing fixtures.
This double-acting cylinder has a G1/2 port and an M20x1.5 rod. It delivers 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 max of 801 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100X840
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100X840 replacement — usually within 7-8 hours.