This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X800H, 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 SI40X800H
The AirTAC Airtac SI40 Standard Cylinder SI40X800H is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 800mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X800H, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke800 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X800H
- 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 SI40X800H
The AirTAC SI40X800H is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 800 mm stroke. It delivers 628 N push force at 0.5 MPa through a G1/4 port. The direct replacement is the SAI40X800H, which shares the exact ISO 15552 mounting interface, bore, stroke, force and port size. This original unit features a Viton H seal for high-temperature environments up to 150 C.
Because this SKU lacks a magnet (-S), it cannot accept position sensors. The SAI upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure and longer life. The SAI family also adds SAIL, SAIF and BSAI variants absent from the SI line.
Airtac SI40 Standard Cylinder SI40X800H Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X800H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X800H |
| Bore size | Ø40 mm |
| Stroke | 800 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 SAI40X800H 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 SAI40X800H 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 SI40X800H
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×800 | 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 SI40X800H Is Used
High-Temperature Ejection
Uses the Viton H seal to reliably push parts out of hot zones up to 150 C without degrading.
Long-Stroke Transfer
Moves packages along an 800 mm stroke, requiring external guides to prevent rod bending.
Replacing the Airtac SI40 Standard Cylinder SI40X800H with the SAI40X800H
To replace the discontinued SI40X800H, order the SAI40X800H. Verify your ISO 15552 mounting fixtures, the 800 mm stroke, and the G1/4 port. This unit has no magnet, so it cannot support switches; if sensing is needed, order an SAI with the S suffix. Because this is an 800 mm stroke, prevent rod bending and side-load damage by using external guides. The Viton H seal handles up to 150 C. A plain cylinder drifts without air; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. If downsizing, a 32 mm bore yields 402 N push; if upsizing, a 50 mm bore provides 982 N at 0.5 MPa.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X800H
- ✓ 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 SI40X800H FAQ
Yes, the SI40X800H is discontinued. The direct replacement is the SAI40X800H. It matches the ISO 15552 mounting interface, 40 mm bore, 800 mm stroke, G1/4 port, and output force, fitting existing fixtures perfectly.
It features a G1/4 port. At 0.5 MPa it pushes 628 N and pulls 528 N. At 0.7 MPa it pushes 879 N, and 1130 N at 0.9 MPa. The theoretical maximum force is 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X800H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X800H replacement — usually within 7-8 hours.