This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X75, 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 SI40X75
The AirTAC Airtac SI40 Standard Cylinder SI40X75 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 SAI40X75, 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 → SAI40X75
- 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 SI40X75
The AirTAC SI40X75 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 75mm stroke, delivering 628N push force at 0.5MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI40X75, a direct alternative retaining the exact interface, force, and mounting dimensions.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. Note this specific SKU lacks a magnet and cannot accept a sensor; the SI family used CS1-B/DS1-B switches on magnetized versions.
Airtac SI40 Standard Cylinder SI40X75 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X75 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X75 |
| 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 SAI40X75 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 SAI40X75 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 SI40X75
| 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 SI40X75 Is Used
Small Part Ejection
Ideal for pushing lightweight machined components out of a fixture with 628N of force at 0.5MPa.
Package Diverting
Actuates a routing gate on a packaging line, utilizing the 75mm stroke to redirect small boxes efficiently.
Clamp Actuation
Secures workpieces during light machining by providing a reliable 528N pull force at 0.5MPa.
Replacing the Airtac SI40 Standard Cylinder SI40X75 with the SAI40X75
To replace the SI40X75, order the SAI40X75 and verify your ISO 15552 mounting fixture, 75mm stroke, and G1/4 air supply. Because this non-magnetized SKU cannot hold a position switch, migrate any CS1-B/DS1-B sensing to an external arrangement or a magnetized SAI variant. If sizing up or down, the 32mm bore yields 402N at 0.5MPa while the 50mm bore provides 982N. A plain cylinder drifts on air loss—the cushion only decelerates—so employ an external pilot check valve or the SAIL/BSAI lock variant for held loads. The 75mm stroke is short enough to avoid rod-bending side-load concerns, operating at 30-800mm/s.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X75
- ✓ 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 SI40X75 FAQ
Yes, the AirTAC SI40X75 is discontinued. The direct replacement is the SAI40X75, which matches the ISO 15552 mounting interface, 40mm bore, 75mm stroke, output force, and G1/4 port size for a seamless fixture fit.
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 theoretical maximum of 128kgf at 1.0MPa.
Request a Quote for the SAI40X75
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X75 replacement — usually within 7-8 hours.