This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX100, 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 SI40 Standard Cylinder SI40BX100
The AirTAC Airtac SI40 Standard Cylinder SI40BX100 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 100mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX100, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke100 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX100
- 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 SI40 Standard Cylinder SI40BX100
The AirTAC SI40BX100 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 100mm stroke. Featuring a SUS304 stainless piston rod, it delivers 628N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI40BX100, matching the interface, force, and mounting.
This SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. For sensing, note this no-S SKU lacks a magnet and cannot take a switch.
Airtac SI40 Standard Cylinder SI40BX100 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX100 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX100 |
| Bore size | Ø40 mm |
| Stroke | 100 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| 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, 27 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI40BX100 carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
The SAI40BX100 produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI40 Standard Cylinder SI40BX100
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×100 | 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 SI40 Standard Cylinder SI40BX100 Is Used
Stainless Rod Actuation
Ideal for light machinery requiring a SUS304 rod for corrosion resistance, providing 628N push force for clamping or indexing.
Material Diversion
Handles 100mm stroke diverting gates on conveyors, using adjustable air cushions to decelerate loads smoothly.
Replacing the Airtac SI40 Standard Cylinder SI40BX100 with the SAI40BX100
To replace the SI40BX100, order the SAI40BX100, confirming the ISO 15552 mounting interface, 40mm bore, 100mm stroke, G1/4 port, and SUS304 rod. If you need load holding, note this plain cylinder drifts without air; use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. For self-contained valve control, explore the SAIF variant (bores 32-100). If sizing up, the 50mm bore offers 982N push at 0.5MPa; sizing down, the 32mm bore provides 402N.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX100
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI40 Standard Cylinder SI40BX100 FAQ
Yes, the SI40BX100 is discontinued. The direct replacement is the SAI40BX100. It is dimensionally interchangeable per ISO 15552, keeping the same 40mm bore, 100mm stroke, G1/4 port, and mounting fixtures.
This double-acting cylinder uses a G1/4 port and features a 16mm rod. Force ratings are 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical max of 128kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX100
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX100 replacement — usually within 7-8 hours.