This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X210, 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 SI40X210
The AirTAC Airtac SI40 Standard Cylinder SI40X210 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 210mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X210, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke210 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X210
- 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 SI40X210
The AirTAC SI40X210 is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 210 mm stroke, delivering 628 N push force at 0.5 MPa. The direct replacement is the SAI40X210, matching the interface, G1/4 port, and M12x1.25 rod thread. This non-magnet SKU cannot accept a sensor.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. If you need load holding on air loss, note the cushion only decelerates; you must use the SAIL lock or BSAI clamp-lock variants the SI lacked.
Airtac SI40 Standard Cylinder SI40X210 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X210 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X210 |
| Bore size | Ø40 mm |
| Stroke | 210 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 SAI40X210 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 SAI40X210 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 SI40X210
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×210 | 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 SI40X210 Is Used
Package Diversion
Actuates routing gates on packaging lines using the 628 N push force at 0.5 MPa to deflect cartons smoothly.
Clamp Actuation
Provides repeatable 210 mm travel for securing medium workpieces in machining fixtures, using the M12x1.25 rod.
Replacing the Airtac SI40 Standard Cylinder SI40X210 with the SAI40X210
To replace the SI40X210, order the SAI40X210. Verify your ISO 15552 mounting interface (LB, FA, TC, etc.), the 210 mm stroke, and G1/4 port. Because this SKU lacks the -S magnet, it cannot take CS1-B/DS1-B sensors; order an SAI with -S if position sensing is required. At 0.5 MPa the 40 mm bore yields 628 N push and 528 N pull; if undersized, the 50 mm bore gives 982 N push. For this 210 mm stroke, ensure guide rails to prevent rod bending under side loads. The SAI family also adds SAIF (built-in valve) and SAIL/BSAI lock variants for dead-load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X210
- ✓ 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 SI40X210 FAQ
Yes, the SI40X210 is discontinued. The direct replacement is the SAI40X210. It is dimensionally interchangeable per the ISO 15552 mounting interface, retaining the same 40 mm bore, 210 mm stroke, 628 N force, G1/4 port, and mounting accessories.
The 40 mm bore delivers 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 max of 128 kgf at 1.0 MPa. Operating speed is 30-800 mm/s. It uses a G1/4 port and has a 27 mm adjustable air cushion at both ends.
Request a Quote for the SAI40X210
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X210 replacement — usually within 7-8 hours.