This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X1230STC, 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 SI40X1230STC
The AirTAC Airtac SI40 Standard Cylinder SI40X1230STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 1230mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X1230STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke1230 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X1230STC
- 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 SI40X1230STC
The AirTAC SI40X1230STC is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 1230mm stroke. Generating 628N push force at 0.5MPa, it is replaced by the SAI40X1230STC. This direct successor retains the exact G1/4 port, M12x1.25 thread, and TC trunnion mount. Note that the 1230mm stroke exceeds the 1200mm standard maximum, making this a non-standard, made-to-order configuration.
The SAI upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure and extended life. It also expands options with SAIL, SAIF, and BSAI variants. The built-in magnet supports legacy CS1-B/DS1-B sensors, while a Viton H seal raises operating temps to 150C.
Airtac SI40 Standard Cylinder SI40X1230STC Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X1230STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X1230STC |
| Bore size | Ø40 mm |
| Stroke | 1230 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 SAI40X1230STC 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 SAI40X1230STC 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 SI40X1230STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×1230 | 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 SI40X1230STC Is Used
Long-Stroke Diversion
Drives large package pushers across wide conveyor belts, utilizing the 1230mm reach and 628N force to redirect heavy goods reliably.
High-Bay Extraction
Extracts pallets from deep storage racking where the extended stroke is necessary and the TC trunnion mount handles the pivotal articulation.
Replacing the Airtac SI40 Standard Cylinder SI40X1230STC with the SAI40X1230STC
To replace the SI40X1230STC, order the SAI40X1230STC. Verify the ISO 15552 TC trunnion mount, G1/4 port, and the -S magnet for CS1-B/DS1-B switches. Because the 1230mm stroke is non-standard and exceeds the 1200mm maximum, expect made-to-order lead times. At 628N push (0.5MPa), it handles a 377N safe load; if you need more force, step up to a 50mm bore (982N push). For lower force, a 32mm bore yields 402N. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or SAIL/BSAI variant to hold loads. Finally, a 1230mm stroke demands external guides to prevent rod bending and side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X1230STC
- ✓ 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 SI40X1230STC FAQ
Yes, the SI40X1230STC is discontinued. The direct replacement is the SAI40X1230STC. It shares the same ISO 15552 mounting interface, 40mm bore, 1230mm stroke, G1/4 port, and TC mount, fitting directly into existing fixtures.
The 40mm bore features a G1/4 air port and provides 628N push / 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical max of 128kgf at 1.0MPa. It operates at 30-800mm/s with a 27mm adjustable cushion.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X1230STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X1230STC replacement — usually within 7-8 hours.