This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X1050STC, 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 SI40X1050STC
The AirTAC Airtac SI40 Standard Cylinder SI40X1050STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 1050mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X1050STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke1050 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X1050STC
- 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 SI40X1050STC
The AirTAC SI40X1050STC is a discontinued double-acting ISO 15552 profile cylinder featuring a 40 mm bore and 1050 mm stroke. Delivering 628 N push force at 0.5 MPa, it utilized a TC trunnion mount and G1/4 port. The direct replacement is the SAI40X1050STC, matching the exact ISO 15552 mounting interface, bore, stroke, force, and accessories.
The SAI upgrade introduces a refined piston seal with two Y-shaped one-way elements for lower start-up pressure and extended life. The original -S magnet supports CS1-B/DS1-B sensors, while the SAI family adds lock variants (SAIL, BSAI) absent in the SI line.
Airtac SI40 Standard Cylinder SI40X1050STC Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X1050STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X1050STC |
| Bore size | Ø40 mm |
| Stroke | 1050 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 SAI40X1050STC 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 SAI40X1050STC 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 SI40X1050STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×1050 | 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 SI40X1050STC Is Used
Long-Stroke Diversion
Drives large package pushers across wide conveyor belts using the 1050 mm stroke and 628 N force.
High-Bay Extraction
Extracts totes from deep shelving units where the TC trunnion mount accommodates structural pivoting.
Vertical Lowering
Lowers 32 kg fixtures safely, requiring external guides to manage rod bending over the long extension.
Replacing the Airtac SI40 Standard Cylinder SI40X1050STC with the SAI40X1050STC
To replace this SI40X1050STC, order the SAI40X1050STC. Verify your ISO 15552 TC trunnion mounting, G1/4 port, and the -S magnet for legacy CS1-B/DS1-B switches (the SAI uses current AirTAC switches). If you need more force, the neighboring 50 mm bore yields 982 N push at 0.5 MPa; if less is acceptable, the 32 mm bore provides 402 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates—so for load holding consider an external pilot check valve or the SAIL/BSAI lock variants. Because the 1050 mm stroke is long, prevent rod bending by using an external guide to absorb side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X1050STC
- ✓ 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 SI40X1050STC FAQ
Yes, the SI40X1050STC is discontinued. The direct replacement is the SAI40X1050STC. It is dimensionally interchangeable per ISO 15552, matching the 40 mm bore, 1050 mm stroke, G1/4 port, and TC mounting interface.
The G1/4 port bore 40 mm cylinder delivers 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 max of 128 kgf at 1.0 MPa. It operates at 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X1050STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X1050STC replacement — usually within 7-8 hours.