This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X120TC, 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 SI40X120TC
The AirTAC Airtac SI40 Standard Cylinder SI40X120TC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 120mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X120TC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke120 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X120TC
- 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 SI40X120TC
The AirTAC SI40X120TC is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 120mm stroke. Delivering 628N push force at 0.5MPa, it features a G1/4 port and TC trunnion mount. The direct replacement is the SAI40X120TC, matching the interface, force and port exactly.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. For this no-magnet SKU, sensors cannot be fitted. Note the Viton H seal option raises heat resistance to 150C.
Airtac SI40 Standard Cylinder SI40X120TC Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X120TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X120TC |
| Bore size | Ø40 mm |
| Stroke | 120 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 SAI40X120TC 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 SAI40X120TC 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 SI40X120TC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×120 | 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 SI40X120TC Is Used
Package Diversion
Actuates routing gates on packaging lines, utilizing the 628N push force at 0.5MPa to deflect cartons reliably at operating speeds up to 800mm/s.
Clamp Actuation
Provides repeatable clamping pressure for light machining fixtures, with the TC trunnion mount accommodating slight angular misalignment during the stroke.
Stopper Cylinder
Functions as a pneumatic stop for pallet accumulation, using the 120mm stroke to raise and lower physical stops under moderate payload inertia.
Replacing the Airtac SI40 Standard Cylinder SI40X120TC with the SAI40X120TC
To replace the SI40X120TC, order the SAI40X120TC and confirm the ISO 15552 TC trunnion interface, 40mm bore, 120mm stroke, G1/4 port and M12x1.25 rod thread. This SKU lacks the -S magnet, so it cannot accept CS1-B or DS1-B sensors. For sizing alternatives, a 32mm bore offers less force, while a 50mm bore gives 982N push at 0.5MPa. Since this is a plain double-acting cylinder, it will not hold a load on air loss; the 27mm cushions only decelerate. For locked loads, consider the SAIL or BSAI variants, or use an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X120TC
- ✓ 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 SI40X120TC FAQ
Yes, the SI40X120TC is discontinued. The direct replacement is the SAI40X120TC. It is dimensionally interchangeable per ISO 15552, preserving the 40mm bore, 120mm stroke, TC mount, G1/4 port and output force so it drops directly into existing fixtures.
The 40mm bore uses a G1/4 air port and a 16mm rod. Theoretical forces are 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a maximum of 128kgf at 1.0MPa. Adjustable air cushions are 27mm at each end.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X120TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X120TC replacement — usually within 7-8 hours.