This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X75SH, 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 SI40X75SH
The AirTAC Airtac SI40 Standard Cylinder SI40X75SH 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 SAI40X75SH, 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 → SAI40X75SH
- 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 SI40X75SH
The AirTAC SI40X75SH is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 75mm stroke. It delivers 628 N push force at 0.5 MPa. The direct replacement is the SAI40X75SH, which matches the G1/4 port, M12x1.25 thread, and ISO 15552 mounting interface.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure. With the -S magnet, this unit accepts legacy CS1-B/DS1-B sensors. The -H Viton seal raises operating temperature to 150 C.
Airtac SI40 Standard Cylinder SI40X75SH Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X75SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X75SH |
| 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 SAI40X75SH 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 SAI40X75SH 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 SI40X75SH
| 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 SI40X75SH Is Used
Compact Part Ejection
Uses the 628 N push force at 0.5 MPa to reliably push machined parts out of a fixture within a tight 75 mm space.
Package Diverting
Short 75 mm stroke actuates a diverter arm to route small boxes on a line, fitting neatly into ISO 15552 mounting holes.
Replacing the Airtac SI40 Standard Cylinder SI40X75SH with the SAI40X75SH
To replace the SI40X75SH, order the SAI40X75SH. Confirm the ISO 15552 mounting interface, G1/4 port, and M12x1.25 rod thread. The -S magnet enables CS1-B/DS1-B switches, while the -H option specifies the Viton high-temperature seal. At 0.5 MPa, push force is 628 N; stepping up to a 50mm bore yields 982 N. Note that a standard cylinder drifts on air loss; for load holding, use an external pilot check valve or the SAIL lock variant. The 27mm cushions only decelerate near stroke ends.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X75SH
- ✓ 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 SI40X75SH FAQ
Yes, the SI40X75SH is discontinued. The direct replacement is the SAI40X75SH. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 75mm stroke, G1/4 port, and mounting fixtures.
The bore is 40mm with a G1/4 air port. Force output is 628 N push and 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, 1130 N push at 0.9 MPa, and a theoretical maximum of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X75SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X75SH replacement — usually within 7-8 hours.