This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X1320S, 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 SI40X1320S
The AirTAC Airtac SI40 Standard Cylinder SI40X1320S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 1320mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X1320S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke1320 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X1320S
- 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 SI40X1320S
The AirTAC SI40X1320S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 1320mm stroke. Because 1320mm exceeds the 1200mm standard maximum for this bore, it is a non-standard, made-to-order length. It delivers 628 N push force at 0.5 MPa via a G1/4 port. The direct replacement is the SAI40X1320S, matching the exact ISO 15552 mounting interface, stroke, and output force.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The SI-S magnet works with legacy CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches. The SAI family also adds SAIL, SAIF, and BSAI lock variants absent in the SI line.
Airtac SI40 Standard Cylinder SI40X1320S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X1320S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X1320S |
| Bore size | Ø40 mm |
| Stroke | 1320 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 SAI40X1320S 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 SAI40X1320S 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 SI40X1320S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×1320 | 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 SI40X1320S Is Used
Long-Stroke Material Push
Pushes workpieces between conveyor stations over extended distances using the 1320mm stroke, relying on external guides to prevent rod bending.
High-Reach Diverting
Diverts packages on sorting lines where a 628 N push force at 0.5 MPa is sufficient to redirect items across wide belt gaps.
Replacing the Airtac SI40 Standard Cylinder SI40X1320S with the SAI40X1320S
To replace the SI40X1320S, order the SAI40X1320S direct: it preserves the 40mm bore, 1320mm stroke, G1/4 port, M12x1.25 rod thread, and ISO 15552 mounting. Retain the -S magnet specification and confirm your port thread (PT, G, or NPT). Since 1320mm is a non-standard stroke exceeding the 1200mm maximum, expect made-to-order lead times. At 0.5 MPa, push force is 628 N; if sizing down, a 32mm bore offers 402 N. If sizing up, a 50mm bore provides 982 N. For this 1320mm length, use external guides to prevent rod bending and side-load damage. A plain cylinder drifts on air loss; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X1320S
- ✓ 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 SI40X1320S FAQ
Yes, the SI40X1320S is discontinued. The direct replacement is the SAI40X1320S. It is dimensionally interchangeable per ISO 15552, matching the 40mm bore, 1320mm stroke, G1/4 port, and mounting interface.
The 40mm bore uses a G1/4 port. At 0.5 MPa it provides 628 N push and 528 N pull force. At 0.7 MPa push is 879 N, at 0.9 MPa it is 1130 N, and the theoretical max force is 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X1320S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X1320S replacement — usually within 7-8 hours.