This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X65H, 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 SI40X65H
The AirTAC SI40 Standard Cylinder SI40X65H is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 65mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X65H, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke65 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X65H
- 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 SI40X65H
The AirTAC SI40X65H is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 65 mm stroke. Delivering 628 N push force at 0.5 MPa, it features a G1/4 port and M12x1.25 rod thread. The direct replacement is the SAI40X65H, matching the exact ISO 15552 mounting interface, bore, stroke, force, and port size. This SKU includes a Viton H seal for 0-150 C high-temperature environments but lacks a magnet, so it cannot accept a position switch.
The SAI upgrade introduces 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 absent in the SI line.
Airtac SI40 Standard Cylinder SI40X65H Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X65H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X65H |
| Bore size | Ø40 mm |
| Stroke | 65 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 SAI40X65H 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 SAI40X65H 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 SI40X65H
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×65 | 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 SI40X65H Is Used
Hot Stamp Ejection
Uses the Viton H high-temp seal to push finished parts out of heated molding zones without degrading.
Divert Arm Actuation
Provides 628 N push force at 0.5 MPa to reliably route medium-weight packages on packaging lines.
Replacing the Airtac SI40 Standard Cylinder SI40X65H with the SAI40X65H
To replace the discontinued SI40X65H, order the SAI40X65H. Confirm the ISO 15552 mounting interface, 65 mm stroke, G1/4 port, and Viton H seal. Because this SKU lacks a magnet (-S), it cannot support sensing; if switches are needed, select an SAI40X65HS. Sizing down, a 32 mm bore yields 402 N at 0.5 MPa; sizing up, a 50 mm bore yields 982 N. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock or pilot check valve for load holding. For lock needs, consider the SAIL or BSAI variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X65H
- ✓ 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 SI40X65H FAQ
Yes, the SI40X65H is discontinued. The direct replacement is the SAI40X65H. It is dimensionally interchangeable per ISO 15552, retaining the same 40 mm bore, 65 mm stroke, output force, and G1/4 port.
The G1/4 port bore delivers 628 N push and 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, and 1130 N push at 0.9 MPa. The theoretical maximum force is 128 kgf at 1.0 MPa.
Request a Quote for the SAI40X65H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X65H replacement — usually within 7-8 hours.