This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX75S, 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 SI40AX75S
The AirTAC Airtac SI40 Standard Cylinder SI40AX75S 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 SAI40AX75S, 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 → SAI40AX75S
- 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 SI40AX75S
The AirTAC SI40AX75S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 75mm stroke. It delivers 628N push and 528N pull at 0.5MPa through a G1/4 port. The direct replacement is the SAI40AX75S, which shares the exact ISO 15552 mounting interface, M12x1.25 rod thread, and force ratings. This SUS420J2 stainless rod variant (-A) includes a piston magnet (-S) for legacy CS1-B/DS1-B sensors.
The SAI upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure and longer life. Note that a plain cylinder drifts on air loss; the air cushion only decelerates near stroke end. For held loads, consider the SAIL lock or BSAI clamp-lock variants the SI line lacked.
Airtac SI40 Standard Cylinder SI40AX75S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX75S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX75S |
| 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 SAI40AX75S 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 SAI40AX75S 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 SI40AX75S
| 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 SI40AX75S Is Used
Stainless Rod Clamping
Ideal for repetitive part clamping in machining cells where the SUS420J2 stainless piston rod resists coolant corrosion and the 628N force secures components firmly.
Package Diverting
Provides reliable 75mm stroke actuation for diverting small to medium packages on packaging lines, operating efficiently at speeds between 30-800 mm/s.
Replacing the Airtac SI40 Standard Cylinder SI40AX75S with the SAI40AX75S
To replace the SI40AX75S, order the SAI40AX75S. Confirm the ISO 15552 mounting interface, 40mm bore, 75mm stroke, G1/4 port (PT/G/NPT thread options), and the -S magnet for current AirTAC switches. The -A rod specifies SUS420J2 stainless steel over the default carbon steel. When sizing both ways, a 32mm bore neighbor offers less force, while a 50mm bore provides 982N push at 0.5MPa. Because this is a double-acting cylinder, it cannot hold a load without live air; the cushion only decelerates. For static holding, use an external pilot check valve or explore the SAIL air-released lock, SAIF built-in 4M valve, or BSAI clamp-lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX75S
- ✓ 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 SI40AX75S FAQ
Yes, the SI40AX75S is discontinued. The direct replacement is the SAI40AX75S. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 75mm stroke, G1/4 port, and mounting interface, but features an upgraded two Y-shaped one-way piston seal.
The 40mm bore features a G1/4 air port and a 16mm rod. It delivers 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical maximum force of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX75S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX75S replacement — usually within 7-8 hours.