This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X190S, 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 SI40X190S
The AirTAC Airtac SI40 Standard Cylinder SI40X190S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 190mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X190S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke190 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X190S
- 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 SI40X190S
The AirTAC SI40X190S is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 190 mm stroke. Delivering 628 N push force at 0.5 MPa through a G1/4 port, it is directly replaced by the SAI40X190S. This direct upgrade shares the exact ISO 15552 mounting interface, bore, stroke and output force, fitting existing fixtures seamlessly. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life.
Because this SKU includes the -S magnet, it supports legacy CS1-B/DS1-B sensors, whereas the SAI replacement uses current AirTAC switches. The SAI family also introduces variants the SI line lacked, such as the SAIL air-released lock, SAIF built-in 4M valve (bores 32-100) and BSAI clamp-lock. Rod material options include carbon steel, SUS420J2 (A) or SUS304 (B), and a Viton H seal raises the operating temperature to 0-150 C. Note that a plain cylinder does not hold load without live air; the cushion only decelerates.
Airtac SI40 Standard Cylinder SI40X190S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X190S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X190S |
| Bore size | Ø40 mm |
| Stroke | 190 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 SAI40X190S 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 SAI40X190S 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 SI40X190S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×190 | 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 SI40X190S Is Used
Component Clamping
Secures mid-weight machined parts during secondary milling or drilling operations, utilizing the 628 N push force at 0.5 MPa for firm, stable holding.
Package Diverting
Actuates routing gates on packaging lines to sort products, with the 190 mm stroke providing the exact reach needed to clear the belt path.
Vertical Lifting
Elevates small bins or trays up to 32 kg using the 40 mm bore, requiring an external pilot check valve to prevent drifting if air pressure drops.
Replacing the Airtac SI40 Standard Cylinder SI40X190S with the SAI40X190S
To replace the discontinued SI40X190S, order the SAI40X190S. Confirm the ISO 15552 mounting interface, 40 mm bore, 190 mm stroke, G1/4 port (PT/G/NPT thread options) and mounting accessory. This unit has the -S magnet for position sensing. When sizing, neighboring bores offer different forces: the 32 mm bore provides 402 N push at 0.5 MPa, while the 50 mm bore yields 982 N. If you need to hold a load vertically without live air, the cushion will not lock the piston; use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variant. For any stroke over 300 mm, guide the load to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X190S
- ✓ 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 SI40X190S FAQ
Yes, the SI40X190S is discontinued. The direct replacement is the AirTAC SAI40X190S. It shares the same ISO 15552 mounting interface, 40 mm bore, 190 mm stroke, output force and G1/4 port, fitting directly into existing fixtures.
The 40 mm bore features a G1/4 port, a 16 mm rod and M12x1.25 rod thread. Force output is 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 maximum of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X190S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X190S replacement — usually within 7-8 hours.