This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X420SH, 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 SI40X420SH
The AirTAC SI40 Standard Cylinder SI40X420SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 420mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X420SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke420 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X420SH
- 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 SI40X420SH
The AirTAC SI40X420SH is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 420 mm stroke. It delivers 628 N push force at 0.5 MPa via a G1/4 port. The direct replacement is the SAI40X420SH, retaining the exact interface, force, and mounting.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure. The -H option specifies Viton seals for 0-150 C heat, while the -S magnet works with CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40X420SH Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X420SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X420SH |
| Bore size | Ø40 mm |
| Stroke | 420 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 SAI40X420SH 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 SAI40X420SH 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 SI40X420SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×420 | 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 SI40X420SH Is Used
Divert Gate Actuation
Drives sorting gates on packaging lines where 628 N push at 0.5 MPa easily overcomes flap friction and product deflection across a 420 mm travel.
Hot End Ejection
The Viton H seal option allows deployment in 0-150 C thermal environments, pushing light molds or parts over 420 mm without premature seal degradation.
Replacing the Airtac SI40 Standard Cylinder SI40X420SH with the SAI40X420SH
To replace the SI40X420SH, order the SAI40X420SH. Verify the ISO 15552 mounting, 40 mm bore, 420 mm stroke, G1/4 port, and -S magnet. For higher force, the 50 mm bore yields 982 N push at 0.5 MPa; for less, the 32 mm bore gives 402 N. At 420 mm, use external guides to prevent rod bending. The cushion only decelerates; for load holding on air loss, use an external pilot check valve or the SAIL lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X420SH
- ✓ 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 SI40X420SH FAQ
Yes, the SI40X420SH is discontinued. The direct replacement is the SAI40X420SH. It is dimensionally interchangeable per ISO 15552, keeping the same 40 mm bore, 420 mm stroke, G1/4 port, and mounting fixtures.
It operates at 30-800 mm/s with a G1/4 port and M12x1.25 rod thread. Force ratings are 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 128 kgf maximum at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X420SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X420SH replacement — usually within 7-8 hours.