This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X670S, 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 SI40X670S
The AirTAC Airtac SI40 Standard Cylinder SI40X670S 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 SAI40X670S, 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 → SAI40X670S
- 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 SI40X670S
The AirTAC SI40X670S is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 670 mm stroke. Delivering 628 N push force at 0.5 MPa via a G1/4 port, it is replaced by the SAI40X670S. This direct successor shares the exact ISO 15552 mounting interface, bore, stroke, output force and port size, fitting existing fixtures perfectly.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also adds SAIL, SAIF and BSAI lock variants. Your SI40X670S includes a magnet for CS1-B/DS1-B sensors; the SAI uses current AirTAC switches.
Airtac SI40 Standard Cylinder SI40X670S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X670S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X670S |
| 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 SAI40X670S 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 SAI40X670S 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 SI40X670S
| 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 SI40X670S Is Used
Long-Stroke Diversion
Drives sorting gates on packaging lines where the 670 mm travel shifts products between parallel conveyor belts.
Vertical Material Lift
Elevates light tote boxes using the 628 N push force, requiring external guides to manage the 670 mm rod extension.
Pneumatic Press Ejection
Pushes finished parts out of light assembly presses, utilizing the adjustable 27 mm air cushions to brake at stroke end.
Replacing the Airtac SI40 Standard Cylinder SI40X670S with the SAI40X670S
To replace this SI40X670S with the SAI40X670S, verify your ISO 15552 mounting interface, 40 mm bore, 670 mm stroke, G1/4 port (PT/G/NPT) and mounting accessory. Because the stroke is 670 mm, add external guides to prevent rod bending and side loads. Size both ways: neighboring bores (32 mm or 50 mm) or check the 0.5 MPa force (628 N push, 528 N pull). A plain cylinder drifts without live air; for load holding use the SAIL lock, BSAI clamp-lock, or an external pilot check valve. The -S magnet works with CS1-B/DS1-B switches.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X670S
- ✓ 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 SI40X670S FAQ
Yes, the SI40X670S is discontinued. The direct replacement is the SAI40X670S. It is dimensionally interchangeable per ISO 15552, retaining the same 40 mm bore, 670 mm stroke, 628 N force, G1/4 port and mounting interface.
The 40 mm bore uses a G1/4 port. Force 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. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X670S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X670S replacement — usually within 7-8 hours.