This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X230SN, 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 SI40X230SN
The AirTAC Airtac SI40 Standard Cylinder SI40X230SN is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 230mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X230SN, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke230 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X230SN
- 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 SI40X230SN
The AirTAC SI40X230SN is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 230mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI40X230SN, retaining identical mounting, output, and dimensions.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and longevity. The original SI line lacked the SAIL lock, SAIF valve, and BSAI clamp variants now available. Your -SN suffix denotes an NBR seal (-20 to +70C) and a piston magnet for CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40X230SN Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X230SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X230SN |
| Bore size | Ø40 mm |
| Stroke | 230 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 SAI40X230SN 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 SAI40X230SN 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 SI40X230SN
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×230 | 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 SI40X230SN Is Used
Package Diversion
Actuates routing gates on packaging lines, utilizing the 628N push force at 0.5 MPa to smoothly pivot heavy cardboard cartons.
Clamp Actuation
Provides reliable clamping pressure for mid-weight machining fixtures, taking advantage of the adjustable 27mm air cushions to soften end-of-stroke impact.
Vertical Lifting
Hoists small material trays up to the 32kg vertical lift capacity, requiring a pilot check valve to sustain the load safely if air pressure drops.
Replacing the Airtac SI40 Standard Cylinder SI40X230SN with the SAI40X230SN
To replace the SI40X230SN, order the SAI40X230SN. Confirm the ISO 15552 mounting fixture, 40mm bore, 230mm stroke, G1/4 port (PT/G/NPT thread), and mounting accessory. The -S magnet enables CS1-B/DS1-B switches, while the SAI uses current AirTAC sensors. For sizing down, a 32mm bore yields 402N push at 0.5MPa; sizing up, a 50mm bore yields 982N. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock or pilot check valve for holding, or specify the SAIL/BSAI lock variant. At 230mm stroke, ensure guide alignment to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X230SN
- ✓ 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 SI40X230SN FAQ
Yes, the SI40X230SN is discontinued. The direct replacement is the SAI40X230SN. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 230mm stroke, 628N force, G1/4 port, and mounting interface.
This 40mm bore cylinder features a G1/4 air port and M12x1.25 rod thread. Force output is 628N push and 528N pull at 0.5 MPa, 879N push at 0.7 MPa, 1130N push at 0.9 MPa, with a theoretical maximum of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X230SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X230SN replacement — usually within 7-8 hours.