This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X200N, 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 SI40X200N
The AirTAC Airtac SI40 Standard Cylinder SI40X200N is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 200mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X200N, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke200 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X200N
- 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 SI40X200N
The AirTAC SI40X200N is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 200mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI40X200N, matching the interface, bore, stroke, force, and mounting. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This SKU lacks a magnet (-S), so it cannot accept a CS1-B/DS1-B sensor. It uses an NBR seal (-N) for -20 to +70C; Viton H raises this to 150C.
The SAI family also introduces SAIL, SAIF, and BSAI lock variants absent in the SI line. Rod material options include carbon steel, SUS420J2, or SUS304.
Airtac SI40 Standard Cylinder SI40X200N Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X200N |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X200N |
| Bore size | Ø40 mm |
| Stroke | 200 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 SAI40X200N 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 SAI40X200N 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 SI40X200N
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×200 | 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 SI40X200N Is Used
Clamp Actuation
Provides 628N of clamping force at 0.5MPa for holding aluminium extrusions during machining, relying on adjustable air cushions for smooth end-of-stroke deceleration.
Replacing the Airtac SI40 Standard Cylinder SI40X200N with the SAI40X200N
To replace the SI40X200N, order the SAI40X200N. Confirm the ISO 15552 mounting interface, 40mm bore, 200mm stroke, G1/4 port (PT/G/NPT thread), and mounting accessory. Because this SKU lacks a magnet, it cannot support position sensing; add the -S suffix on the SAI if you need switches. When sizing, a 32mm bore offers 402N push at 0.5MPa, while a 50mm bore provides 982N. The 200mm stroke is well within the 1200mm standard limit, but for any stroke over 300mm, use a guide to prevent rod bending and side-load wear. A plain cylinder does not hold load without live air; for load holding, use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X200N
- ✓ 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 SI40X200N FAQ
Yes, the SI40X200N is discontinued. The direct replacement is the SAI40X200N. It is dimensionally interchangeable per ISO 15552, matching the 40mm bore, 200mm stroke, 628N force, G1/4 port, and mounting fixtures.
The 40mm bore features a G1/4 air port and M12x1.25 rod thread. Force output is 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical max of 128kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X200N
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X200N replacement — usually within 7-8 hours.