This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX100S, 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 SI40AX100S
The AirTAC Airtac SI40 Standard Cylinder SI40AX100S 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 SAI40AX100S, 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 → SAI40AX100S
- 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 SI40AX100S
The AirTAC SI40AX100S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore, 100mm stroke, and SUS420J2 stainless piston rod. Delivering 628N push force at 0.5MPa via a G1/4 port, it is replaced by the SAI40AX100S. This direct upgrade shares the exact ISO 15552 mounting interface, bore, stroke, force, and port size.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. It also introduces SAIL, SAIF, and BSAI lock variants the SI lacked. The -S magnet works with legacy CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40AX100S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX100S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX100S |
| 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 SAI40AX100S 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 SAI40AX100S 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 SI40AX100S
| 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 SI40AX100S Is Used
Stainless Rod Clamping
Ideal for mid-force clamping tasks where the SUS420J2 stainless rod offers corrosion resistance against coolant splash.
Package Diverting
Provides reliable 100mm stroke actuation for diverting moderate-weight packages on material handling lines.
Vertical Lift Gates
Suitable for lifting light access gates or stops, safely handling loads near the 32kg vertical lift threshold.
Replacing the Airtac SI40 Standard Cylinder SI40AX100S with the SAI40AX100S
To replace the SI40AX100S, order the SAI40AX100S. Verify your ISO 15552 mounting interface (LB, FA, TC, etc.), the 100mm stroke, G1/4 port, and the -S magnet for CS1-B/DS1-B switches. The SAI family adds SAIL and BSAI lock variants for load holding, as a plain cylinder drifts without live air. Sizing both ways: a 32mm bore yields 402N push at 0.5MPa, while a 50mm bore yields 982N. The -A rod is SUS420J2 stainless steel.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX100S
- ✓ 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 SI40AX100S FAQ
Yes, the SI40AX100S is discontinued. The direct replacement is the SAI40AX100S, which shares the same ISO 15552 mounting interface, 40mm bore, 100mm stroke, force, G1/4 port, and mounting accessories.
The G1/4 port bore delivers 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 SAI40AX100S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX100S replacement — usually within 7-8 hours.