This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X1150STC, 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 SI40X1150STC
The AirTAC Airtac SI40 Standard Cylinder SI40X1150STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 1150mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X1150STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke1150 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X1150STC
- 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 SI40X1150STC
The AirTAC SI40X1150STC is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 1150mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI40X1150STC, matching the interface, TC trunnion mount, and output force exactly.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. If you need load holding on air loss, the plain cylinder drifts; use the SAIL lock or BSAI clamp-lock variants instead.
Airtac SI40 Standard Cylinder SI40X1150STC Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X1150STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X1150STC |
| Bore size | Ø40 mm |
| Stroke | 1150 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 SAI40X1150STC 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 SAI40X1150STC 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 SI40X1150STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×1150 | 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 SI40X1150STC Is Used
Long-Stroke Material Transfer
Pushes workpieces between machining stations over a 1150mm span, relying on the TC trunnion to accommodate frame alignment shifts during transit.
Replacing the Airtac SI40 Standard Cylinder SI40X1150STC with the SAI40X1150STC
To replace the SI40X1150STC, order the SAI40X1150STC. Verify the ISO 15552 TC trunnion mounting, G1/4 port, M12x1.25 rod thread, and the -S magnet for CS1-B/DS1-B sensors (the SAI uses current AirTAC switches). Sizing both ways: a 32mm bore yields 402N push at 0.5MPa, while a 50mm bore yields 982N. At 1150mm stroke, use external guides to prevent rod bending and side loads. The air cushion only decelerates; it does not hold load. For clamping needs, explore the SAIL or BSAI variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X1150STC
- ✓ 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 SI40X1150STC FAQ
Yes, the SI40X1150STC is discontinued. The direct replacement is the SAI40X1150STC. It is dimensionally interchangeable per ISO 15552, matching the 40mm bore, 1150mm stroke, G1/4 port, TC mount, and output force.
It has a G1/4 air port. The force ratings are: 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical max of 128kgf at 1.0MPa. The SAI upgrade adds a two Y-shaped one-way piston seal for lower start-up pressure.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X1150STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X1150STC replacement — usually within 7-8 hours.