This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X145H, 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 SI40X145H
The AirTAC Airtac SI40 Standard Cylinder SI40X145H is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 145mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X145H, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke145 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X145H
- 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 SI40X145H
The AirTAC SI40X145H is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 145 mm stroke. It delivers 628 N push force at 0.5 MPa, features a G1/4 port, and includes a Viton H seal for high-temperature use up to 150 C. Because this SKU lacks a magnet, it cannot accept a sensor switch.
The direct replacement is the SAI40X145H. It shares the exact ISO 15552 mounting interface, bore, stroke, force, and port. The SAI upgrade features a new 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.
Airtac SI40 Standard Cylinder SI40X145H Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X145H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X145H |
| Bore size | Ø40 mm |
| Stroke | 145 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 SAI40X145H 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 SAI40X145H 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 SI40X145H
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×145 | 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 SI40X145H Is Used
Hot End Ejection
Ideal for pushing parts at elevated temperatures using the Viton H seal, providing reliable 628 N actuation in heated manufacturing zones.
Mid-Stroke Diversion
The 145 mm stroke handles diverting or sorting tasks on conveyor lines where standard 125 or 150 mm strokes are slightly too long or short.
Replacing the Airtac SI40 Standard Cylinder SI40X145H with the SAI40X145H
To replace the discontinued SI40X145H, order the SAI40X145H. Verify the ISO 15552 mounting interface, 40 mm bore, 145 mm stroke, G1/4 port, and your specific mounting accessory. Because this original SKU has no magnet, it cannot support sensing; if you need position detection, select an SAI40X145H-S and use current AirTAC switches. When sizing, consider neighboring bores: a 32 mm bore yields 402 N push at 0.5 MPa, while a 50 mm bore yields 982 N. For load holding, note that a plain cylinder drifts on air loss—the cushion only decelerates. Use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for secure holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X145H
- ✓ 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 SI40X145H FAQ
Yes, the AirTAC SI40X145H is discontinued. The direct replacement is the SAI40X145H. It matches the ISO 15552 mounting interface, 40 mm bore, 145 mm stroke, output force, and G1/4 port, fitting existing fixtures perfectly.
It has a 16 mm rod, M12x1.25 thread, 27 mm cushion, and G1/4 port. Force ratings are 628 N push and 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, and a max of 128 kgf at 1.0 MPa. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X145H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X145H replacement — usually within 7-8 hours.