This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX5S, 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 SI40AX5S
The AirTAC Airtac SI40 Standard Cylinder SI40AX5S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 5mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX5S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke5 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX5S
- 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 SI40AX5S
The AirTAC SI40AX5S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 5mm stroke. It delivers 628N push force at 0.5MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI40AX5S, a direct upgrade retaining the exact ISO 15552 mounting interface, stroke, and output force. The SAI features an upgraded piston seal using two Y-shaped one-way elements for low start-up pressure and extended life.
This specific unit includes a SUS420J2 stainless steel rod (-A) and a piston magnet (-S) for legacy CS1-B/DS1-B switches. Note that a plain cylinder drifts on air loss; the cushion only decelerates. For load holding, explore the SAIL or BSAI lock variants, or use an external pilot check valve.
Airtac SI40 Standard Cylinder SI40AX5S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX5S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX5S |
| Bore size | Ø40 mm |
| Stroke | 5 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 SAI40AX5S 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 SAI40AX5S 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 SI40AX5S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×5 | 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 SI40AX5S Is Used
Short-Stroke Clamping
Ideal for holding lightweight aluminum extrusions or sheet metal parts in machining fixtures using its 628N push force over a compact 5mm travel.
Ejector Pins
Provides rapid part ejection from testing jigs, utilizing the 30-800 mm/s speed range and SUS420J2 stainless rod for corrosion resistance.
Small Part Diverting
Acts as a high-speed diverter arm on packaging lines, where the 5mm stroke quickly blocks or releases small components without overshooting.
Replacing the Airtac SI40 Standard Cylinder SI40AX5S with the SAI40AX5S
To replace the discontinued SI40AX5S, order the SAI40AX5S. Confirm the ISO 15552 mounting interface, 40mm bore, 5mm stroke, G1/4 port (PT/G/NPT thread options), and the SUS420J2 stainless rod requirement. The built-in magnet (-S) accommodates CS1-B/DS1-B sensors. If you need slightly more force, the neighbouring 50mm bore yields 982N push at 0.5MPa; if less is acceptable, the 32mm bore provides 402N. Because this is a plain cylinder, it will not hold a load without live air—the cushions only decelerate. For secure holding, consider the SAIL air-released lock, the BSAI clamp-lock, or an external rod lock.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX5S
- ✓ 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 SI40AX5S FAQ
Yes, the AirTAC SI40AX5S is discontinued. The direct replacement is the SAI40AX5S. It shares the same ISO 15552 mounting interface, 40mm bore, 5mm stroke, G1/4 port, and force ratings, fitting directly into existing fixtures.
This double-acting cylinder uses a G1/4 air port. It generates 628N push and 528N pull at 0.5 MPa, 879N push at 0.7 MPa, 1130N push at 0.9 MPa, and a theoretical maximum of 128 kgf at 1.0 MPa.
Request a Quote for the SAI40AX5S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX5S replacement — usually within 7-8 hours.