This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100BX40S, 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 SI100BX40S
The AirTAC Airtac SI100 Standard Cylinder SI100BX40S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 40mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100BX40S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke40 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100BX40S
- 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 SI100BX40S
The AirTAC SI100BX40S is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore, 40mm stroke, G1/2 port and SUS304 stainless steel rod. It delivers 3927N push force at 0.5MPa. AirTAC replaced this legacy unit with the SAI100BX40S, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, force and porting. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life.
This -S model includes a piston magnet for legacy CS1-B/DS1-B switches, while the SAI replacement uses current AirTAC sensors. The SAI family also introduces lock and valve variants like SAIL and BSAI that the original SI lacked.
Airtac SI100 Standard Cylinder SI100BX40S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100BX40S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100BX40S |
| Bore size | Ø100 mm |
| Stroke | 40 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 SAI100BX40S 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 SAI100BX40S 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 SI100BX40S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×40 | 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 SI100BX40S Is Used
High-Force Clamping
Secures heavy steel plates in machining fixtures using 3927N of push force at 0.5MPa.
Pallet Stopping
Acts as a robust end-stop for loaded pallets, leveraging the 100mm bore and 40mm short stroke.
Press Insertion
Drives bearings into housings with reliable 200kg vertical lift capacity and a stainless rod.
Replacing the Airtac SI100 Standard Cylinder SI100BX40S with the SAI100BX40S
To replace the SI100BX40S, order the SAI100BX40S direct equivalent. Confirm your ISO 15552 mounting accessory (LB, FA, TC, etc.), the G1/2 port thread (PT, G or NPT) and the M20x1.5 rod thread. Because this unit uses the -B SUS304 stainless rod, verify if your environment still requires it over standard carbon steel. If you need to size up or down, neighbouring bores are 80mm and 125mm; at 0.5MPa this 100mm bore gives 3927N push and 3681N pull. The cushion only decelerates the piston at stroke end and does not hold load on air loss—for a locked load, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. The 40mm stroke is well within the 1500mm standard limit, so no side-load concerns apply here.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100BX40S
- ✓ 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 SI100BX40S FAQ
Yes, the SI100BX40S is discontinued. The direct replacement is the SAI100BX40S. It shares the same ISO 15552 mounting interface, 100mm bore, 40mm stroke, G1/2 port and output force, so it fits existing fixtures directly.
This 100mm bore cylinder uses a G1/2 air port. The thrust ratings are 3927N push and 3681N pull at 0.5MPa, 5497N push at 0.7MPa, 7068N push at 0.9MPa, and a theoretical maximum of 801kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100BX40S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100BX40S replacement — usually within 7-8 hours.