This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X100S, 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 SI40X100S
The AirTAC Airtac SI40 Standard Cylinder SI40X100S 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 SAI40X100S, 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 → SAI40X100S
- 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 SI40X100S
The AirTAC SI40X100S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 100mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI40X100S, matching the interface, force, and stroke exactly.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked. Your -S suffix means a magnet for CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40X100S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X100S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X100S |
| 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 SAI40X100S 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 SAI40X100S 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 SI40X100S
| 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 SI40X100S Is Used
Component Clamping
Secures medium-duty workpieces in machining fixtures, utilizing the 628N push force at 0.5MPa for rigid holding during milling or drilling operations.
Package Diverting
Actuates sorting gates on 40mm bore assembly lines, providing reliable 100mm stroke movements to redirect products at speeds up to 800mm/s.
Material Ejection
Pushes completed parts out of press dies or forming stations, using the 528N pull force to retract the 16mm rod rapidly for the next cycle.
Replacing the Airtac SI40 Standard Cylinder SI40X100S with the SAI40X100S
To replace the SI40X100S, order the SAI40X100S. Confirm the ISO 15552 mounting interface, 40mm bore, 100mm stroke, G1/4 port (PT/G/NPT threads), and your specific mounting accessory (LB, FA, TC, etc.). The -S magnet equates to legacy CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches. If you need more force, the 50mm bore offers 982N push at 0.5MPa; if less is required, the 32mm bore provides 402N. Remember, a standard cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X100S
- ✓ 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 SI40X100S FAQ
Yes, the AirTAC SI40X100S is discontinued. The direct replacement is the SAI40X100S. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 100mm stroke, 628N force, G1/4 port, and mounting interface.
The 40mm bore cylinder provides 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, and a theoretical max of 128kgf at 1.0MPa. It features a 16mm rod, M12x1.25 thread, 27mm cushion, and operates at 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X100S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X100S replacement — usually within 7-8 hours.