This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X502SN, 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 SI40X502SN
The AirTAC SI40 Standard Cylinder SI40X502SN is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 502mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X502SN, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke502 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X502SN
- 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 SI40X502SN
The AirTAC SI40X502SN is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 502 mm stroke. It delivers 628 N push force at 0.5 MPa through a G1/4 port. The direct replacement is the SAI40X502SN, matching the exact ISO 15552 mounting interface, stroke, force and accessories. The SAI upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life. This -SN variant includes a piston magnet for CS1-B/DS1-B switches and NBR seals (-20 to +70 C); Viton H raises this to 150 C.
The 502 mm stroke requires external guides to prevent rod bending under side loads. Note that a standard cylinder drifts on air loss; use an external rod lock or pilot check valve for load holding, or explore the SAI family's SAIL air-released lock or BSAI clamp-lock variants.
Airtac SI40 Standard Cylinder SI40X502SN Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X502SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X502SN |
| Bore size | Ø40 mm |
| Stroke | 502 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 SAI40X502SN 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 SAI40X502SN 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 SI40X502SN
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×502 | 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 SI40X502SN Is Used
Package Diverting
Actuates routing gates on packaging lines where the 628 N push force easily deflects standard totes.
Vertical Lowering
Lowers lightweight platens up to 32 kg safely, provided external linear guides support the 502 mm stroke.
Pallet Stops
Deploys pneumatic stop pins at conveyor ends to halt pallets using the 528 N pull force.
Replacing the Airtac SI40 Standard Cylinder SI40X502SN with the SAI40X502SN
To replace the discontinued SI40X502SN, order the SAI40X502SN. Verify your ISO 15552 mounting fixtures (LB, FA, TC, etc.), the 40 mm bore, 502 mm stroke, G1/4 port, and the -S magnet for current AirTAC switches. If you need more force, the neighbouring 50 mm bore provides 982 N push at 0.5 MPa; if less is acceptable, the 32 mm bore offers 402 N. Because the 502 mm stroke exceeds 300 mm, use external guides to prevent rod-bending side loads. A plain double-acting cylinder does not hold load without live air—the cushion only decelerates. For secure holding, specify an external pilot check valve, a rod lock, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X502SN
- ✓ 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 SI40X502SN FAQ
Yes, the SI40X502SN is discontinued. The direct replacement is the SAI40X502SN. It is dimensionally interchangeable per ISO 15552, retaining the same 40 mm bore, 502 mm stroke, 628 N force, G1/4 port and mounting interface.
The bore is 40 mm with a G1/4 air port. It generates 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X502SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X502SN replacement — usually within 7-8 hours.