This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X75LB, 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 SI40X75LB
The AirTAC Airtac SI40 Standard Cylinder SI40X75LB 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 SAI40X75LB, 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 → SAI40X75LB
- 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 SI40X75LB
The AirTAC SI40X75LB is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 75mm stroke. Delivering 628N push force at 0.5MPa, it is superseded by the SAI40X75LB direct replacement. This successor matches the exact G1/4 port, M12x1.25 rod thread and LB foot mounting interface, dropping straight into existing fixtures.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and extended life. Because this specific SI40X75LB SKU lacks a magnet (-S), it cannot accept position sensors.
Airtac SI40 Standard Cylinder SI40X75LB Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X75LB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X75LB |
| 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 SAI40X75LB 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 SAI40X75LB 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 SI40X75LB
| 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 SI40X75LB Is Used
Clamping Mechanisms
Applies 628N of push force at 0.5MPa to secure medium-duty workpieces during machining operations.
Package Diversion
Drives a 75mm stroke diverter arm to route lightweight to medium cartons on packaging lines.
Replacing the Airtac SI40 Standard Cylinder SI40X75LB with the SAI40X75LB
To replace the SI40X75LB, order the SAI40X75LB. Verify the ISO 15552 mounting interface, 40mm bore, 75mm stroke, G1/4 port and LB foot accessory. This non-magnetic SKU cannot host a sensor; if switching is needed, select an SAI40X75LBS. For sizing alternatives, a 32mm bore yields 402N push at 0.5MPa, while a 50mm bore provides 982N. Note that a plain cylinder drifts on air loss—the cushion only decelerates near stroke end. For secure load holding, consider an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X75LB
- ✓ 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 SI40X75LB FAQ
Yes, the SI40X75LB is discontinued. The direct replacement is the SAI40X75LB. It shares the identical ISO 15552 mounting interface, 40mm bore, 75mm stroke, output force, G1/4 port and LB foot mount, fitting existing fixtures perfectly.
The 40mm bore features a G1/4 air port and M12x1.25 rod thread. It delivers 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. Operating speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X75LB
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X75LB replacement — usually within 7-8 hours.