This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X950, 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 SI40X950
The AirTAC Airtac SI40 Standard Cylinder SI40X950 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 SAI40X950, 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 → SAI40X950
- 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 SI40X950
The AirTAC SI40X950 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 950mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI40X950, matching the exact interface, force, and mounting.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. This SKU lacks a magnet, so it cannot take a sensor. For high heat, Viton H seals raise the temperature limit to 150C.
Airtac SI40 Standard Cylinder SI40X950 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X950 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X950 |
| 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 SAI40X950 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 SAI40X950 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 SI40X950
| 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 SI40X950 Is Used
Long-Stroke Diversion
Pushes packages across a 950mm transfer belt using the 628N push force at 0.5MPa, requiring external guides to prevent rod bending.
Pneumatic Slide Table
Moves a machining fixture 950mm forward and back at 30-800mm/s, ensuring the G1/4 port matches existing air lines.
Replacing the Airtac SI40 Standard Cylinder SI40X950 with the SAI40X950
To replace the SI40X950, order the SAI40X950. Verify the ISO 15552 mounting interface, 950mm stroke, G1/4 port, and M12x1.25 rod thread. Since this SKU has no -S magnet, it cannot accept CS1-B/DS1-B sensors; order a magnet-equipped SAI if sensing is needed. A 950mm stroke demands external guides to prevent rod bending and side-load damage. The 628N push force at 0.5MPa suits moderate loads; step up to a 50mm bore if higher force is needed. Note that plain cylinders drift on air loss—use a pilot check valve or SAIL/BSAI lock variant to hold loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X950
- ✓ 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 SI40X950 FAQ
Yes, the SI40X950 is discontinued. The direct replacement is the SAI40X950. It is dimensionally interchangeable per ISO 15552, matching the 40mm bore, 950mm stroke, 628N force, G1/4 port, and mounting fixtures.
The G1/4 port feeds a 40mm bore yielding 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, and 1130N push at 0.9MPa. The theoretical maximum force is 128kgf at 1.0MPa.
Request a Quote for the SAI40X950
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X950 replacement — usually within 7-8 hours.