This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100BX840S, 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 SI100BX840S
The AirTAC Airtac SI100 Standard Cylinder SI100BX840S 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 SAI100BX840S, 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 → SAI100BX840S
- 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 SI100BX840S
The AirTAC SI100BX840S is a discontinued double-acting ISO 15552 profile cylinder with an 840 mm stroke, SUS304 stainless rod, and a G1/2 port. Delivering 3927 N push at 0.5 MPa, it is replaced by the SAI100BX840S.
The SAI direct retains the exact ISO 15552 mounting interface, bore, and force. It upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure.
Airtac SI100 Standard Cylinder SI100BX840S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100BX840S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100BX840S |
| 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 SAI100BX840S 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 SAI100BX840S 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 SI100BX840S
| 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 SI100BX840S Is Used
Long-Stroke Diversion
Pushes heavy pallets across 840 mm transfer lines where the 3927 N thrust and SUS304 rod handle lateral shifting without corrosion.
Vertical Material Lift
Raises 200 kg loads in automated storage systems, utilizing the full stroke while requiring external guides to manage rod bending.
Large Press Ejection
Ejects formed parts from machinery using the 7068 N push at 0.9 MPa, relying on adjustable cushions to decelerate at stroke end.
Replacing the Airtac SI100 Standard Cylinder SI100BX840S with the SAI100BX840S
To replace the SI100BX840S, order the SAI100BX840S. Confirm the ISO 15552 mounting interface, G1/2 port, M20x1.5 rod thread, SUS304 rod, and the -S magnet for CS1-B/DS1-B switches. At 840 mm, this long stroke demands external guides to prevent rod bending and side-load wear. For sizing, a 100 mm bore gives 5497 N at 0.7 MPa; dropping to an 80 mm bore yields 2513 N at 0.5 MPa. The air cushion only decelerates; it does not hold load on air loss. For static holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100BX840S
- ✓ 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 SI100BX840S FAQ
Yes, the SI100BX840S is discontinued. The direct replacement is the SAI100BX840S. It features the same ISO 15552 mounting interface, 100 mm bore, 840 mm stroke, G1/2 port, and output force, fitting existing fixtures directly.
The G1/2 port bore delivers a push of 3927 N and pull of 3681 N at 0.5 MPa, 5497 N push at 0.7 MPa, 7068 N at 0.9 MPa, and a maximum theoretical force of 801 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100BX840S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100BX840S replacement — usually within 7-8 hours.