This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X670, 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 SI40X670
The AirTAC Airtac SI40 Standard Cylinder SI40X670 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 670mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X670, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke670 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X670
- 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 SI40X670
The AirTAC SI40X670 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 670mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI40X670, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, force, and port size.
The SAI upgrade features a redesigned piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. For applications needing load holding, the SAI family introduces SAIL and BSAI lock variants absent in the SI line. Since this SKU lacks the -S magnet, it cannot accept a sensor.
Airtac SI40 Standard Cylinder SI40X670 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X670 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X670 |
| Bore size | Ø40 mm |
| Stroke | 670 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 SAI40X670 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 SAI40X670 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 SI40X670
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×670 | 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 SI40X670 Is Used
Material Diversion
Drives diverter gates on packaging lines, utilizing the 670mm stroke to route products efficiently across transfer belts.
Vertical Ejection
Pushes completed parts out of machining fixtures, handling the 32kg vertical lift capacity safely with external guidance.
Long-Reach Clamping
Actuates remote clamping arms in welding cells where the extended stroke is required to clear large workpiece envelopes.
Replacing the Airtac SI40 Standard Cylinder SI40X670 with the SAI40X670
To replace the SI40X670, order the SAI40X670. Confirm your ISO 15552 mounting accessories (LB, FA, TC, etc.), the G1/4 port thread (PT/G/NPT), and the M12x1.25 rod thread. Because this 670mm stroke is long, use external guides to prevent rod bending and side-load damage. If sizing up or down, neighboring bores are 32mm (402N push @0.5MPa) and 50mm (982N push @0.5MPa). This plain cylinder cannot hold a load without live air; the cushion only decelerates. For load holding on air loss, use an external pilot check valve, a rod lock, or the SAIL/BSAI lock variant. Without the -S magnet option, this cylinder cannot support position sensing.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X670
- ✓ 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 SI40X670 FAQ
Yes, the AirTAC SI40X670 is discontinued. The direct replacement is the SAI40X670. It shares the identical ISO 15552 mounting interface, 40mm bore, 670mm stroke, output force, and G1/4 port, fitting existing fixtures directly.
The G1/4 port feeds a 16mm rod. Force ratings are 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical max of 128kgf at 1.0MPa. Speed is 30-800mm/s.
Request a Quote for the SAI40X670
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X670 replacement — usually within 7-8 hours.