This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X212S, 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 SI40X212S
The AirTAC Airtac SI40 Standard Cylinder SI40X212S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 212mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X212S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke212 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X212S
- 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 SI40X212S
The AirTAC SI40X212S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 212mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI40X212S, a direct upgrade retaining the exact interface, stroke, force, and mounting fixtures.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The SAI family also introduces SAIL, SAIF, and BSAI lock variants absent in the SI line.
Airtac SI40 Standard Cylinder SI40X212S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X212S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X212S |
| Bore size | Ø40 mm |
| Stroke | 212 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 SAI40X212S 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 SAI40X212S 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 SI40X212S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×212 | 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 SI40X212S Is Used
Package Diversion
Actuates routing gates on packaging lines, providing the 628N push force needed to redirect moderate-weight cartons reliably.
Vertical Lift Stops
Raises and lowers pallet stops in low-force material handling, where the 32kg vertical lift capacity fits lightweight inventory control.
Clamp Actuation
Drives small pneumatic clamps on machining fixtures, utilizing the 212mm stroke to clear the work area for robotic loading.
Replacing the Airtac SI40 Standard Cylinder SI40X212S with the SAI40X212S
To replace this SI40X212S, order the SAI40X212S and verify your ISO 15552 mounting interface, G1/4 port, M12x1.25 rod thread, and magnet (-S for CS1-B/DS1-B switches). Because 212mm exceeds the 1200mm standard maximum, this is a nonstandard stroke requiring confirmation. For sizing, neighboring bores are 32mm (402N push) and 50mm (982N push) at 0.5MPa. Since the stroke is over 300mm, ensure external guides to prevent rod bending and side-load damage. A plain cylinder drifts without air; use the SAIL or BSAI lock variant for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X212S
- ✓ 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 SI40X212S FAQ
Yes, the SI40X212S is discontinued. The direct replacement is the SAI40X212S. It matches the ISO 15552 mounting interface, 40mm bore, 212mm stroke, force, and G1/4 port, fitting existing fixtures perfectly.
It uses a G1/4 air port. Force ratings are 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a maximum theoretical force of 128kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X212S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X212S replacement — usually within 7-8 hours.