This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100BX185S, 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 SI100BX185S
The AirTAC Airtac SI100 Standard Cylinder SI100BX185S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 185mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100BX185S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke185 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100BX185S
- 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 SI100BX185S
The AirTAC SI100BX185S is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore, 185mm stroke, and a SUS304 stainless piston rod. Delivering 3927N push force at 0.5MPa via its G1/2 port, it is replaced by the SAI100BX185S.
The SAI direct maintains the exact ISO 15552 mounting interface, force, and stroke. It upgrades the piston seal to two Y-shaped one-way elements for low start-up pressure.
Airtac SI100 Standard Cylinder SI100BX185S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100BX185S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100BX185S |
| Bore size | Ø100 mm |
| Stroke | 185 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 SAI100BX185S 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 SAI100BX185S 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 SI100BX185S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×185 | 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 SI100BX185S Is Used
Heavy-Duty Pressing
Drives large forming or stamping presses requiring 3927N of push force at 0.5MPa with stable 185mm travel.
Stainless Rod Washdown
Ideal for food or chemical washdown zones using the SUS304 rod option to resist corrosion during actuation.
Replacing the Airtac SI100 Standard Cylinder SI100BX185S with the SAI100BX185S
To replace the SI100BX185S, order the SAI100BX185S. Confirm the ISO 15552 mounting interface, G1/2 port, M20x1.5 rod thread, and the -S magnet for CS1-B/DS1-B switches. The SAI uses current AirTAC switches. Sizing both ways: a neighbouring 80mm bore yields 2513N push at 0.5MPa, while a 125mm bore yields 6136N. For load holding on air loss, note the cushion only decelerates; use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100BX185S
- ✓ 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 SI100BX185S FAQ
Yes, the SI100BX185S is discontinued. The direct replacement is the SAI100BX185S. It is dimensionally interchangeable per ISO 15552, retaining the same 100mm bore, 185mm stroke, G1/2 port, and mounting interface.
It features a G1/2 port. Force output is 3927N push and 3681N pull at 0.5MPa, 5497N push at 0.7MPa, 7068N push at 0.9MPa, and a maximum theoretical force of 801kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100BX185S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100BX185S replacement — usually within 7-8 hours.