This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX950, 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 SI40AX950
The AirTAC Airtac SI40 Standard Cylinder SI40AX950 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 950mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX950, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke950 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX950
- 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 SI40AX950
The AirTAC SI40AX950 is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 950 mm stroke. It delivers 628 N push force at 0.5 MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI40AX950, a direct sharing the exact interface, bore, stroke, force, and mounting.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. Because this SKU lacks a magnet (-S), it cannot take a sensor. For safe sizing, expect a 377 N working load (~60% of push) or 32 kg vertical lift. The SUS420J2 stainless rod resists corrosion, and a Viton H seal raises heat to 150 C.
Airtac SI40 Standard Cylinder SI40AX950 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX950 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX950 |
| Bore size | Ø40 mm |
| Stroke | 950 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 SAI40AX950 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 SAI40AX950 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 SI40AX950
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×950 | 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 SI40AX950 Is Used
Long-Stroke Diversion
Pushes packages across transfer lines using the full 950 mm travel, relying on the 628 N thrust to overcome guide friction.
Vertical Material Lift
Raises lightweight totes up to 32 kg in pick modules, requiring external guides to prevent rod bending over the long stroke.
Corrosive Environment Actuation
Drives damp or washdown gating fixtures using the SUS420J2 stainless rod option to resist rust while cycling.
Replacing the Airtac SI40 Standard Cylinder SI40AX950 with the SAI40AX950
To replace the SI40AX950, order the SAI40AX950. Verify the ISO 15552 mounting interface, 40 mm bore, 950 mm stroke, G1/4 port (PT/G/NPT), and your specific mounting accessory. This non-magnet SKU cannot accept a CS1-B/DS1-B switch; order an SAI with -S if sensing is needed. At 950 mm, prevent rod bending by adding external guides to absorb side loads. If stepping up, a 50 mm bore yields 982 N push; if stepping down, a 32 mm bore gives 402 N. The cushion only decelerates; for load holding on air loss, use an external pilot check valve, rod lock, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX950
- ✓ 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 SI40AX950 FAQ
Yes, the SI40AX950 is discontinued. The direct replacement is the SAI40AX950. It shares the same ISO 15552 mounting interface, 40 mm bore, 950 mm stroke, output force, and G1/4 port, fitting existing fixtures perfectly.
It features a G1/4 air port. The thrust ratings are 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 max of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX950
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX950 replacement — usually within 7-8 hours.