This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X965S, 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 SI40X965S
The AirTAC Airtac SI40 Standard Cylinder SI40X965S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 965mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X965S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke965 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X965S
- 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 SI40X965S
The AirTAC SI40X965S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 965mm stroke. It delivers 628N push force at 0.5MPa and uses a G1/4 port. AirTAC replaced this legacy unit with the SAI40X965S, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, force and port size.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. This -S model includes a piston magnet for legacy CS1-B/DS1-B sensors; the SAI family uses current AirTAC switches and adds SAIL, SAIF and BSAI variants.
Airtac SI40 Standard Cylinder SI40X965S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X965S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X965S |
| Bore size | Ø40 mm |
| Stroke | 965 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 SAI40X965S 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 SAI40X965S 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 SI40X965S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×965 | 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 SI40X965S Is Used
Long-Stroke Diversion
Drives diverter gates on packaging lines over a 965mm span, utilizing the 628N push force to reliably shift heavy product flows without lateral binding.
Extended Reach Transfer
Actuates extended reach arms to transfer components between machine zones, requiring external guide rails to support the 965mm stroke length.
Replacing the Airtac SI40 Standard Cylinder SI40X965S with the SAI40X965S
To replace the SI40X965S, order the SAI40X965S. Confirm your ISO 15552 mounting accessory (LB, FA, FB, CA, CB, TC), the G1/4 port, and the M12x1.25 rod thread. If you need less force, step down to a 32mm bore (402N push @0.5MPa); if you need more, step up to a 50mm bore (982N push @0.5MPa). Because this is a 965mm long stroke, use an external guide to prevent rod bending and side-load damage. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for load holding. The magnet (-S) supports CS1-B/DS1-B switches.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X965S
- ✓ 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 SI40X965S FAQ
Yes, the SI40X965S is discontinued. The direct replacement is the AirTAC SAI40X965S. It is dimensionally interchangeable per ISO 15552, matching the 40mm bore, 965mm stroke, 628N force, G1/4 port, and mounting interface. The SAI simply upgrades the piston seal to two Y-shaped elements for lower start-up pressure.
At 0.5MPa it provides 628N push and 528N pull force. At 0.7MPa push is 879N, and at 0.9MPa it is 1130N. The theoretical maximum force is 128kgf at 1.0MPa. Operating pressure is 0.15-1.0MPa, speed is 30-800mm/s, and the G1/4 port and M12x1.25 rod thread are fixed by the 40mm bore.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X965S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X965S replacement — usually within 7-8 hours.