This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX950S, 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 SI40AX950S
The AirTAC Airtac SI40 Standard Cylinder SI40AX950S 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 SAI40AX950S, 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 → SAI40AX950S
- 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 SI40AX950S
The AirTAC SI40AX950S is a discontinued double-acting ISO 15552 profile cylinder featuring a 40mm bore, 950mm stroke, and a SUS420J2 stainless steel rod. It delivers 628N push and 528N pull at 0.5MPa through a G1/4 port. The direct replacement is the SAI40AX950S, sharing the same interface, force, and mounting.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. The SAI family adds SAIL lock, SAIF valve, and BSAI clamp-lock variants. This SI includes a magnet for CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40AX950S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX950S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX950S |
| 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 SAI40AX950S 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 SAI40AX950S 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 SI40AX950S
| 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 SI40AX950S Is Used
Long-Stroke Diversion
Pushes packages across transfer lines using the 950mm stroke, with the G1/4 port ensuring consistent cycle speeds.
Vertical Material Lift
Elevates components up to 32kg using the 40mm bore, relying on external guides to prevent rod bending over the long travel.
Stainless Rod Actuation
Drives tooling stages where the SUS420J2 rod provides necessary corrosion resistance against moisture or washdowns.
Replacing the Airtac SI40 Standard Cylinder SI40AX950S with the SAI40AX950S
To replace the SI40AX950S, order the SAI40AX950S, confirming the ISO 15552 mounting interface, 40mm bore, 950mm stroke, G1/4 port, and mounting accessory. The -A denotes a SUS420J2 rod and -S denotes the magnet for legacy CS1-B/DS1-B switches (the SAI uses current AirTAC switches). For sizing, the neighbouring 32mm bore yields 402N push at 0.5MPa, while the 50mm bore yields 982N. Note that a plain cylinder drifts without live air; for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. Because the 950mm stroke is long, prevent rod bending by using external guides to manage side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX950S
- ✓ 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 SI40AX950S FAQ
Yes, the SI40AX950S is discontinued. The direct replacement is the SAI40AX950S. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 950mm stroke, 628N force, G1/4 port, and mounting interface.
The 40mm bore provides 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N at 0.9MPa, and a theoretical max of 128kgf at 1.0MPa. Operating speed is 30-800mm/s. The rod thread is M12x1.25 with a 27mm adjustable cushion at each end.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX950S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX950S replacement — usually within 7-8 hours.