This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X225STC, 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 SI40X225STC
The AirTAC Airtac SI40 Standard Cylinder SI40X225STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 225mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X225STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke225 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X225STC
- 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 SI40X225STC
The AirTAC SI40X225STC is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 225mm stroke. It delivers 628N push force at 0.5MPa through a G1/4 port. The direct replacement is the SAI40X225STC, matching the exact bore, stroke, force, port and TC trunnion mounting interface for immediate fixture integration.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The original -S magnet supports CS1-B/DS1-B sensors, while the SAI family adds lock and valve variants like SAIL and SAIF that the SI lacked.
Airtac SI40 Standard Cylinder SI40X225STC Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X225STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X225STC |
| Bore size | Ø40 mm |
| Stroke | 225 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 SAI40X225STC 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 SAI40X225STC 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 SI40X225STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×225 | 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 SI40X225STC Is Used
Package Diversion
Actuates routing gates on packaging lines where 628N push at 0.5MPa easily deflects cartons.
Clamp Actuation
Drives medium-duty workholding clamps on machining fixtures via the ISO 15552 TC trunnion mount.
Replacing the Airtac SI40 Standard Cylinder SI40X225STC with the SAI40X225STC
To replace the SI40X225STC, order the SAI40X225STC. Verify the ISO 15552 TC trunnion mounting, 40mm bore, 225mm stroke, G1/4 port (PT/G/NPT thread options) and the -S magnet for current AirTAC switches. At 0.5MPa it yields 628N push and 528N pull; neighbouring bores are 32mm (402N push) or 50mm (982N push). Because the 225mm stroke exceeds 300mm, ensure adequate guide support to prevent rod bending and side loads. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for held loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X225STC
- ✓ 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 SI40X225STC FAQ
Yes, the AirTAC SI40X225STC is discontinued. The direct replacement is the SAI40X225STC. It is dimensionally interchangeable per ISO 15552, preserving the same 40mm bore, 225mm stroke, G1/4 port, force output and TC mounting interface.
This double-acting cylinder has a G1/4 air port. The thrust ratings are 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical maximum force of 128kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X225STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X225STC replacement — usually within 7-8 hours.