This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X75SFA, 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 SI40X75SFA
The AirTAC Airtac SI40 Standard Cylinder SI40X75SFA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 75mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X75SFA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke75 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X75SFA
- 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 SI40X75SFA
The AirTAC SI40X75SFA is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 75mm stroke. It delivers 628N push force at 0.5MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI40X75SFA, a direct upgrade retaining the exact interface, force, and mounting.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure. The SAI family also adds SAIL, SAIF, and BSAI lock variants absent in the SI line.
Airtac SI40 Standard Cylinder SI40X75SFA Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X75SFA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X75SFA |
| Bore size | Ø40 mm |
| Stroke | 75 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 SAI40X75SFA 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 SAI40X75SFA 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 SI40X75SFA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×75 | 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 SI40X75SFA Is Used
Component Clamping
Ideal for securing mid-weight machined parts during milling or drilling operations using the 628N push force.
Package Diverting
Provides reliable 75mm stroke actuation to push or sort medium-sized cartons on automated packaging lines.
Pallet Stopper Gates
Controls pallet flow on rollers by extending a 40mm bore rod to act as a physical stop barrier.
Replacing the Airtac SI40 Standard Cylinder SI40X75SFA with the SAI40X75SFA
To replace the SI40X75SFA, order the SAI40X75SFA. Confirm the ISO 15552 mounting interface, 40mm bore, 75mm stroke, G1/4 port (PT/G/NPT), FA flange accessory, and the -S magnet for CS1-B/DS1-B switches. If you need more force, the 50mm bore yields 982N push at 0.5MPa; if less is acceptable, the 32mm bore provides 402N. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for held loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X75SFA
- ✓ 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 SI40X75SFA FAQ
Yes, the SI40X75SFA is discontinued. The direct replacement is the SAI40X75SFA. It shares the same ISO 15552 mounting interface, 40mm bore, 75mm stroke, output force, G1/4 port, and FA flange, fitting directly into existing fixtures.
The 40mm bore uses a G1/4 air port and M12x1.25 rod thread. 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X75SFA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X75SFA replacement — usually within 7-8 hours.