This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X15H, 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 SI40X15H
The AirTAC Airtac SI40 Standard Cylinder SI40X15H is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 15mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X15H, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke15 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X15H
- 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 SI40X15H
The AirTAC SI40X15H is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 15 mm stroke. Built with an extruded aluminum barrel, it delivers 628 N push force at 0.5 MPa through a G1/4 port. The direct replacement is the SAI40X15H, matching the bore, stroke, force, port, and ISO 15552 mounting interface exactly.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. This specific SKU lacks a magnet, so it cannot accept a CS1-B or DS1-B sensor.
Airtac SI40 Standard Cylinder SI40X15H Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X15H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X15H |
| Bore size | Ø40 mm |
| Stroke | 15 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 SAI40X15H 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 SAI40X15H 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 SI40X15H
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×15 | 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 SI40X15H Is Used
Short-Stroke Clamping
Ideal for holding lightweight machined components in fixtures using its 628 N push force over a compact 15 mm travel.
Small Part Ejection
Provides a fast 30-800 mm/s ejection pulse for small plastic or metal parts exiting a molding or forming station.
Diverting Mechanism
Drives short-throw diverter gates or sorting flaps in light material handling lines where a 32 kg vertical lift margin is sufficient.
Replacing the Airtac SI40 Standard Cylinder SI40X15H with the SAI40X15H
To replace the discontinued SI40X15H, order the SAI40X15H. Confirm the ISO 15552 mounting interface, 40 mm bore, 15 mm stroke, G1/4 port, and your specific mounting accessory. Because this SKU lacks the -S magnet, it cannot support position sensing; if sensing is required, select an SAI equivalent with a magnet. The factory -H seal provides high-temperature Viton/FKM compatibility up to 150 C. If you need to size up or down, the adjacent 32 mm bore yields 402 N push at 0.5 MPa, while the 50 mm bore yields 982 N. Note that a plain cylinder does not hold load without live air; the cushion only decelerates. For load holding, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X15H
- ✓ 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 SI40X15H FAQ
Yes, the AirTAC SI40X15H is discontinued. The direct replacement is the SAI40X15H. It is dimensionally interchangeable per ISO 15552, retaining the same 40 mm bore, 15 mm stroke, output force, G1/4 port, and mounting interface.
The 40 mm bore uses a G1/4 port. Force output is 628 N push and 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, 1130 N push at 0.9 MPa, and a theoretical maximum of 128 kgf at 1.0 MPa.
Request a Quote for the SAI40X15H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X15H replacement — usually within 7-8 hours.