This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X70SH, 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 SI40X70SH
The AirTAC Airtac SI40 Standard Cylinder SI40X70SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 70mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X70SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke70 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X70SH
- 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 SI40X70SH
The AirTAC SI40X70SH is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 70mm stroke. It delivers 628N push at 0.5MPa via a G1/4 port. The direct replacement is the SAI40X70SH, matching the exact bore, stroke, force, port and mounting interface.
This SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. The SI40X70SH includes a magnet for CS1-B/DS1-B switches and a Viton H seal for 0-150C.
Airtac SI40 Standard Cylinder SI40X70SH Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X70SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X70SH |
| Bore size | Ø40 mm |
| Stroke | 70 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 SAI40X70SH 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 SAI40X70SH 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 SI40X70SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×70 | 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 SI40X70SH Is Used
Hot End Ejection
Uses the Viton H high-temperature seal to push parts out of 0-150C heated molds with a safe 377N working load.
Transfer Diverters
Actuates routing gates on packaging lines where the 628N push force and 70mm stroke provide precise package redirection.
Vertical Lift Stops
Raises lightweight pallet stops with a 32kg vertical lift capacity, using CS1-B/DS1-B sensors for position confirmation.
Replacing the Airtac SI40 Standard Cylinder SI40X70SH with the SAI40X70SH
To replace the SI40X70SH, order the SAI40X70SH. Confirm the ISO 15552 mounting interface, 70mm stroke, G1/4 port, and magnet (-S). If you need higher force, the 50mm bore yields 982N push at 0.5MPa; if smaller, the 32mm bore yields 402N. This cylinder has a Viton H seal for 0-150C. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variant. The SAI family also adds the SAIF self-valve option for bores 32-100.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X70SH
- ✓ 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 SI40X70SH FAQ
Yes, the SI40X70SH is discontinued. The direct replacement is the SAI40X70SH. It is dimensionally interchangeable per ISO 15552, matching the 40mm bore, 70mm stroke, G1/4 port, and mounting fixtures.
The SI40X70SH has a G1/4 air port. It delivers 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, and a theoretical max force of 128kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X70SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X70SH replacement — usually within 7-8 hours.