This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X835S, 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 SI40X835S
The AirTAC Airtac SI40 Standard Cylinder SI40X835S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 835mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X835S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke835 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X835S
- 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 SI40X835S
The AirTAC SI40X835S is a discontinued double-acting ISO 15552 profile cylinder. Delivering 628 N push force at 0.5 MPa through a 40 mm bore and 835 mm stroke, it is superseded by the SAI40X835S. This direct successor matches the G1/4 port, M12x1.25 rod thread, and mounting interface exactly.
The SAI upgrade features a refined piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The -S magnet works with legacy CS1-B/DS1-B sensors, while the SAI family adds SAIL lock, SAIF valve, and BSAI clamp variants.
Airtac SI40 Standard Cylinder SI40X835S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X835S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X835S |
| Bore size | Ø40 mm |
| Stroke | 835 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 SAI40X835S 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 SAI40X835S 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 SI40X835S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×835 | 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 SI40X835S Is Used
Long-Stroke Diversion
Pushes packages across a transfer line using the full 835 mm travel, relying on the 628 N thrust at 0.5 MPa to overcome guide friction.
Linear Actuation
Cycles an automated assembly tool along the extended axis, requiring external guides to manage side loads on the long 16 mm rod.
Replacing the Airtac SI40 Standard Cylinder SI40X835S with the SAI40X835S
To replace the SI40X835S, order the SAI40X835S. Verify the ISO 15552 mounting fixture, 40 mm bore, 835 mm stroke, G1/4 port, and magnet (-S) for CS1-B/DS1-B switches. If you need more force, the 50 mm bore offers 982 N push at 0.5 MPa; if less is acceptable, the 32 mm bore provides 402 N. Because 835 mm exceeds 300 mm, add external guides to prevent rod bending and side-load wear. A plain cylinder drifts without live air; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X835S
- ✓ 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 SI40X835S FAQ
Yes, the SI40X835S is discontinued. The direct replacement is the SAI40X835S. It shares the identical ISO 15552 mounting interface, 40 mm bore, 835 mm stroke, output force, and G1/4 port, fitting existing fixtures perfectly.
This double-acting cylinder has a 16 mm rod, M12x1.25 thread, 27 mm cushion, and 30-800 mm/s speed. Force ratings are 628 N push and 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, 1130 N at 0.9 MPa, and a 128 kgf max at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X835S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X835S replacement — usually within 7-8 hours.