This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX100H, 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 SI40AX100H
The AirTAC Airtac SI40 Standard Cylinder SI40AX100H 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 SAI40AX100H, 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 → SAI40AX100H
- 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 SI40AX100H
The AirTAC SI40AX100H is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore, 100mm stroke, and a Viton H high-temperature seal (0-150 C). It delivers 628 N push force at 0.5 MPa and uses a G1/4 air port. The direct replacement is the SAI40AX100H, sharing the same interface, force, and port size. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. It also adds SAIL, SAIF, and BSAI lock variants the SI lacked.
This SKU includes a SUS420J2 stainless steel rod and has no magnet, meaning it cannot accept a position switch. Note that a plain cylinder drifts on air loss; the cushion only decelerates near stroke end. For load holding, use an external rod lock or pilot check valve.
Airtac SI40 Standard Cylinder SI40AX100H Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX100H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX100H |
| 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 SAI40AX100H 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 SAI40AX100H 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 SI40AX100H
| 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 SI40AX100H Is Used
Hot-End Part Ejection
Suits 40mm bore ejection of formed parts near heat zones, utilizing the Viton H seal up to 150 C and 628 N push force to clear molds reliably.
High-Temp Diverting
Diverts small packages on a 100mm stroke in warm ambient environments, where the SUS420J2 stainless rod resists corrosion and the G1/4 port cycles at 30-800 mm/s.
Clamp Actuation
Provides 528 N pull force for holding light workpieces during machining, with the 27mm adjustable cushion decelerating the load at stroke end.
Replacing the Airtac SI40 Standard Cylinder SI40AX100H with the SAI40AX100H
To replace the discontinued SI40AX100H, order the SAI40AX100H. Verify your ISO 15552 mounting interface (LB, FA, TC, etc.), 40mm bore, 100mm stroke, and G1/4 port. Because this SKU lacks a magnet (-S), it cannot support legacy CS1-B/DS1-B sensors; if sensing is needed, specify an SAI with an S suffix. This unit uses the Viton H seal for 0-150 C environments and the SUS420J2 stainless rod. If you need more force, the 50mm bore offers 982 N; if less, the 32mm bore offers 402 N. For load holding on air loss, select the SAIL or BSAI lock variant, or add an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX100H
- ✓ 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 SI40AX100H FAQ
Yes, the SI40AX100H is discontinued. The direct replacement is the SAI40AX100H. It is dimensionally interchangeable per ISO 15552, keeping the same 40mm bore, 100mm stroke, 628 N force, G1/4 port, and mounting interface. The SAI upgrades the piston seal with two Y-shaped elements for lower start-up pressure.
The G1/4 port is fixed by the 40mm bore. At 0.5 MPa it provides 628 N push and 528 N pull. At 0.7 MPa push is 879 N, and at 0.9 MPa it is 1130 N. The theoretical maximum force is 128 kgf at 1.0 MPa. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX100H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX100H replacement — usually within 7-8 hours.