This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X1370S, 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 SI40X1370S
The AirTAC Airtac SI40 Standard Cylinder SI40X1370S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 1370mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X1370S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke1370 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X1370S
- 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 SI40X1370S
The AirTAC SI40X1370S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 1370mm stroke. Generating 628N push at 0.5MPa, it is replaced directly by the SAI40X1370S. This direct upgrade keeps the G1/4 port, M12x1.25 thread and mounting interface identical. As 1370mm exceeds the 1200mm standard, it is a non-standard made-to-order item.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. It also adds SAIL, SAIF and BSAI variants the SI lacked. The -S magnet works with legacy CS1-B/DS1-B sensors, while SAI uses current AirTAC switches.
Airtac SI40 Standard Cylinder SI40X1370S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X1370S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X1370S |
| Bore size | Ø40 mm |
| Stroke | 1370 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 SAI40X1370S 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 SAI40X1370S 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 SI40X1370S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×1370 | 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 SI40X1370S Is Used
Long-Stroke Diversion
Pushes packages across transfer lines using the full 1370mm travel, requiring external guides to prevent rod bending.
High-Bay Extraction
Extracts totes from deep shelving racks where the 628N push force at 0.5MPa easily overcomes sliding friction.
Replacing the Airtac SI40 Standard Cylinder SI40X1370S with the SAI40X1370S
To replace the SI40X1370S, order the SAI40X1370S. Verify the ISO 15552 mounting, G1/4 port, M12x1.25 rod thread and the -S magnet. Because 1370mm exceeds the 1200mm standard maximum, expect a non-standard made-to-order stroke. For sizing, neighbouring bores are 32mm (402N) and 50mm (982N) at 0.5MPa. For this 1370mm stroke, use external guides to prevent rod bending and side-load damage. A plain cylinder drifts without air; for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X1370S
- ✓ 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 SI40X1370S FAQ
Yes, the SI40X1370S is discontinued. The direct replacement is the SAI40X1370S. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 1370mm stroke, 628N force, G1/4 port and mounting interface.
The 40mm bore has a G1/4 port. It delivers 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X1370S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X1370S replacement — usually within 7-8 hours.