This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX200, 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 SI40AX200
The AirTAC Airtac SI40 Standard Cylinder SI40AX200 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 SAI40AX200, 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 → SAI40AX200
- 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 SI40AX200
The AirTAC SI40AX200 is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 200 mm stroke. It delivers 628 N push and 528 N pull at 0.5 MPa, operating through a G1/4 port. AirTAC replaced this legacy unit with the SAI40AX200, a direct replacement sharing the exact ISO 15552 mounting interface, bore, stroke, output force, port size and accessories.
The SAI upgrade introduces a refined piston seal featuring two Y-shaped one-way elements for extended life and low start-up pressure. This specific SI40AX200 variant uses a SUS420J2 (A) stainless steel piston rod for corrosion resistance instead of standard carbon steel. Because this SKU lacks the -S magnet suffix, it cannot accept a position sensor.
Airtac SI40 Standard Cylinder SI40AX200 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX200 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX200 |
| 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 SAI40AX200 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 SAI40AX200 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 SI40AX200
| 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 SI40AX200 Is Used
Medium-Duty Clamping
Securing aluminium extrusions or machined housings during CNC milling, utilising the 879 N push force at 0.7 MPa to hold components rigidly against fixture stops.
Package Diverting
Driving 200 mm stroke diverter arms on packaging lines to route boxes, where the SUS420J2 stainless rod resists humidity and washdown environments.
Replacing the Airtac SI40 Standard Cylinder SI40AX200 with the SAI40AX200
To replace the discontinued SI40AX200, order the SAI40AX200. Verify the ISO 15552 mounting interface, 40 mm bore, 200 mm stroke, G1/4 port (PT/G/NPT thread options) and your specific mounting accessory. Because this SKU lacks the -S magnet, it cannot support legacy CS1-B/DS1-B sensors; if sensing is required, select an SAI40X200S equivalent. For sizing down, a 32 mm bore yields 402 N push at 0.5 MPa; for higher force, a 50 mm bore yields 982 N. Note that a plain double-acting cylinder drifts on air loss because the air cushion only decelerates near stroke end. For load holding, use an external pilot check valve, rod lock, or the SAIL/BSAI lock variants. The SAIF variant adds a built-in 4M valve for bores 32-100.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX200
- ✓ 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 SI40AX200 FAQ
Yes, the AirTAC SI40AX200 is discontinued and end-of-life. The direct replacement is the SAI40AX200. It shares the same ISO 15552 mounting interface, 40 mm bore, 200 mm stroke, output force, G1/4 port and accessories, fitting directly into existing fixtures.
The bore is 40 mm with a G1/4 air port and an M12x1.25 rod thread. The thrust is 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 maximum of 128 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX200
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX200 replacement — usually within 7-8 hours.