This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X40FA, 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 SI40X40FA
The AirTAC Airtac SI40 Standard Cylinder SI40X40FA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 40mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X40FA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke40 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X40FA
- 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 SI40X40FA
The AirTAC SI40X40FA is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 40mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port and FA flange. The direct replacement is the SAI40X40FA, sharing the exact interface, force, and mounting.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. Note this SKU lacks a magnet, so it cannot accept CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40X40FA Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X40FA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X40FA |
| Bore size | Ø40 mm |
| Stroke | 40 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 SAI40X40FA 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 SAI40X40FA 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 SI40X40FA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×40 | 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 SI40X40FA Is Used
Short-Stroke Clamping
Ideal for holding light workpieces in machining fixtures using the 628N push force over a compact 40mm travel.
Package Diverting
Provides rapid actuation for diverting small packages on a conveyor line, operating at speeds of 30-800 mm/s.
Part Ejection
Delivers quick ejection of molded or stamped parts from a press area using the FA flange mount for rigid body attachment.
Replacing the Airtac SI40 Standard Cylinder SI40X40FA with the SAI40X40FA
To replace the SI40X40FA, order the SAI40X40FA. Confirm the ISO 15552 FA flange interface, 40mm stroke, G1/4 port, and thread options (PT/G/NPT). Since this SKU lacks an -S magnet, it cannot support position sensing. For sizing, the 32mm bore yields 402N push at 0.5MPa, while the 50mm bore yields 982N. A plain cylinder drifts on air loss; for load holding, use an external pilot check valve or the SAIL/BSAI lock variants. The 40mm stroke is short, so side-load risks are minimal, but always ensure FA flange alignment.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X40FA
- ✓ 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 SI40X40FA FAQ
Yes, the SI40X40FA is discontinued. The direct replacement is the SAI40X40FA. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 40mm stroke, 628N force, G1/4 port, and FA flange mounting.
This double-acting cylinder has a G1/4 air port. It generates 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a maximum theoretical force of 128kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X40FA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X40FA replacement — usually within 7-8 hours.