This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X1400S, 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 SI40X1400S
The AirTAC Airtac SI40 Standard Cylinder SI40X1400S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 1400mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X1400S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke1400 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X1400S
- 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 SI40X1400S
The AirTAC SI40X1400S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 1400mm stroke. Because 1400mm exceeds the 1200mm standard maximum for this bore, it is a non-standard, made-to-order length. It delivers 628 N push force at 0.5 MPa and uses a G1/4 port. AirTAC replaced the SI line with the SAI family; the direct replacement is the SAI40X1400S, matching the interface, bore, stroke, force, port and mounting.
The SAI upgrade features a revised piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The original SI utilized CS1-B/DS1-B legacy sensors via its -S magnet, while the SAI uses current AirTAC switches. The SAI family also introduces SAIL, SAIF and BSAI lock variants absent in the SI line.
Airtac SI40 Standard Cylinder SI40X1400S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X1400S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X1400S |
| Bore size | Ø40 mm |
| Stroke | 1400 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 SAI40X1400S 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 SAI40X1400S 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 SI40X1400S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×1400 | 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 SI40X1400S Is Used
Long-Stroke Diversion
Pushes packages across a wide conveyor belt sorting lane using the full 1400mm travel, relying on external guides to manage rod bending.
Vertical Material Lift
Raises light components up to 32 kg in a storage rack, operating safely within the 377 N working load margin at 0.5 MPa.
Pneumatic Slide Transfer
Actuates a linear slide to shuttle parts between machines, requiring the G1/4 air port and ISO 15552 mounting dimensions.
Replacing the Airtac SI40 Standard Cylinder SI40X1400S with the SAI40X1400S
To replace the SI40X1400S, order the SAI40X1400S direct equivalent. Verify the ISO 15552 mounting interface, the G1/4 port, and your mounting accessory (LB, FA, TC, etc.). The -S suffix indicates a piston magnet for position sensing; the original SI used CS1-B/DS1-B switches, whereas the SAI takes current AirTAC sensors. Because 1400mm exceeds the 1200mm standard stroke limit for a 40mm bore, this is a made-to-order non-standard stroke. At this length, side-load and rod-bending risks are high, so external guides are strongly recommended to prevent premature seal wear. If sizing up or down, note the 50mm bore offers 982 N push at 0.5 MPa, while the 32mm bore provides 402 N. A plain cylinder will not hold a load on air loss—the cushion only decelerates. For load holding, consider the SAIL lock, BSAI clamp-lock, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X1400S
- ✓ 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 SI40X1400S FAQ
Yes, the SI40X1400S is discontinued. The direct replacement is the SAI40X1400S. It is dimensionally interchangeable per ISO 15552, keeping the same 40mm bore, 1400mm stroke, G1/4 port, and mounting interface.
This double-acting 40mm bore cylinder has a G1/4 port. It provides 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 force of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X1400S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X1400S replacement — usually within 7-8 hours.