This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X370, 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 SI40X370
The AirTAC Airtac SI40 Standard Cylinder SI40X370 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 370mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X370, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke370 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X370
- 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 SI40X370
The AirTAC SI40X370 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 370mm stroke. Delivering 628N push force at 0.5MPa via a G1/4 port, it is directly replaced by the SAI40X370. This direct upgrade shares the exact same mounting interface, bore, stroke and output force, fitting existing fixtures perfectly.
The SAI upgrade features a refined piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. Note this specific SKU lacks a magnet (-S) and cannot accept a sensor. The SAI family also introduces SAIL, SAIF and BSAI lock variants absent in the legacy line.
Airtac SI40 Standard Cylinder SI40X370 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X370 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X370 |
| Bore size | Ø40 mm |
| Stroke | 370 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 SAI40X370 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 SAI40X370 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 SI40X370
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×370 | 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 SI40X370 Is Used
Package Diverting
Actuates routing gates on packaging lines where 628N push force reliably redirects standard cartons at speed.
Pallet Stop Arms
Deploys mechanical stops at conveyor ends, absorbing kinetic energy via the adjustable 27mm air cushions.
Replacing the Airtac SI40 Standard Cylinder SI40X370 with the SAI40X370
To replace the SI40X370, order the SAI40X370 ensuring your ISO 15552 interface, 40mm bore, 370mm stroke, G1/4 port and mounting accessory match. Because this SKU lacks the -S magnet, it cannot support legacy CS1-B/DS1-B sensors; order an -S variant if position detection is needed. Sizing both ways: a neighbouring 32mm bore yields 402N push at 0.5MPa, while a 50mm bore yields 982N. For this 370mm stroke, use external guides to prevent rod-bending and side-load wear. Plain cylinders drift without live air; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X370
- ✓ 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 SI40X370 FAQ
Yes, the SI40X370 is discontinued. The direct replacement is the SAI40X370, offering the same ISO 15552 mounting interface, 40mm bore, 370mm stroke, output force and G1/4 port.
It features a G1/4 port and provides 628N push / 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical max of 128kgf at 1.0MPa.
Request a Quote for the SAI40X370
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X370 replacement — usually within 7-8 hours.