This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X75H, 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 SI40X75H
The AirTAC Airtac SI40 Standard Cylinder SI40X75H 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 SAI40X75H, 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 → SAI40X75H
- 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 SI40X75H
The AirTAC SI40X75H is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 75mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI40X75H, which shares the exact ISO 15552 mounting interface, bore, stroke, output force and porting. This SKU uses a Viton H seal, raising the operating temperature range to 0-150C.
Because this specific SKU lacks a magnet, it cannot accept a position switch. The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life.
Airtac SI40 Standard Cylinder SI40X75H Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X75H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X75H |
| 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 SAI40X75H 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 SAI40X75H 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 SI40X75H
| 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 SI40X75H Is Used
Hot End Ejection
Handles part ejection in warm environments using the Viton H high-temperature seal, reliably cycling short 75mm strokes.
Transfer Diverters
Powers light-duty diverting arms on packaging lines, providing 628N push force at 0.5MPa for smooth product routing.
Clamp Actuators
Secures workpieces during machining operations, utilizing the 16mm carbon steel rod to deliver precise clamping pressure.
Replacing the Airtac SI40 Standard Cylinder SI40X75H with the SAI40X75H
To replace the discontinued SI40X75H, order the SAI40X75H. Confirm the ISO 15552 mounting accessory (LB foot, FA flange, TC trunnion) matches your fixture, and specify the Viton H high-temperature seal. This non-magnetic SKU cannot take a sensor; if sensing is needed, select an SAI40X75HS and use current AirTAC switches. If you need more force than the 879N at 0.7MPa, step up to a 50mm bore; if less force is acceptable, drop to a 32mm bore. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X75H
- ✓ 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 SI40X75H FAQ
Yes, the SI40X75H is discontinued. The direct replacement is the SAI40X75H. It shares the identical ISO 15552 mounting interface, 40mm bore, 75mm stroke, output force, and G1/4 port, fitting directly into existing fixtures.
The bore is 40mm with a G1/4 air port. The thrust is 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, and 1130N push at 0.9MPa. The theoretical maximum force is 128kgf at 1.0MPa.
Request a Quote for the SAI40X75H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X75H replacement — usually within 7-8 hours.