This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X110S, 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 SI40X110S
The AirTAC Airtac SI40 Standard Cylinder SI40X110S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 110mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X110S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke110 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X110S
- 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 SI40X110S
The AirTAC SI40X110S is a discontinued double-acting ISO 15552 profile cylinder featuring a 40mm bore and 110mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI40X110S, matching the bore, stroke, force, port and ISO 15552 mounting interface for existing fixtures.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. For load holding, the SAIL or BSAI lock variants are available.
Airtac SI40 Standard Cylinder SI40X110S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X110S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X110S |
| Bore size | Ø40 mm |
| Stroke | 110 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 SAI40X110S 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 SAI40X110S 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 SI40X110S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×110 | 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 SI40X110S Is Used
Component Clamping
Ideal for securing mid-weight machined parts during milling or drilling, utilizing the 628N push force at 0.5MPa for rigid workholding.
Package Diverting
Provides reliable 110mm stroke actuation to push or sort moderate cartons off a production line without overwhelming the system.
Pallet Stopper
Acts as a pneumatic stop gate for pallets up to 32kg, safely halting flow at workstations using the calculated vertical lift margin.
Replacing the Airtac SI40 Standard Cylinder SI40X110S with the SAI40X110S
To replace the SI40X110S, order the SAI40X110S and confirm the ISO 15552 mounting interface, 40mm bore, 110mm stroke, G1/4 port (PT/G/NPT), and the -S magnet for CS1-B/DS1-B switches. When sizing, note the 40mm bore yields 628N push at 0.5MPa; dropping to a 32mm bore gives 402N, while a 50mm bore provides 982N. A plain cylinder drifts on air loss as the cushion only decelerates, so use a pilot check valve or SAIL lock for holding. Stroke is under 300mm so rod bending is minimal.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X110S
- ✓ 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 SI40X110S FAQ
Yes, the SI40X110S is discontinued. The direct replacement is the SAI40X110S. It features the same ISO 15552 mounting interface, 40mm bore, 110mm stroke, output force, G1/4 port and accessories, fitting directly into existing fixtures.
The 40mm bore uses a G1/4 port. At 0.5MPa it provides 628N push and 528N pull force. Push force is 879N at 0.7MPa and 1130N at 0.9MPa. The theoretical maximum force is 128kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X110S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X110S replacement — usually within 7-8 hours.