This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X1350S, 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 SI40X1350S
The AirTAC Airtac SI40 Standard Cylinder SI40X1350S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 1350mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X1350S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke1350 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X1350S
- 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 SI40X1350S
The AirTAC SI40X1350S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 1350mm stroke. Because 1350mm exceeds the 1200mm maximum standard stroke for this bore, it is a non-standard, made-to-order length. It delivers 628 N push and 528 N pull at 0.5 MPa, utilizing a G1/4 port and M12x1.25 rod thread. The direct replacement is the SAI40X1350S, matching the original interface, bore, stroke, force, and mounting.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. The SAI family also adds SAIL, SAIF, and BSAI lock variants absent in the SI line. Your SI40X1350S includes a magnet for CS1-B/DS1-B switches, which the SAI replaces with current AirTAC sensors.
Airtac SI40 Standard Cylinder SI40X1350S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X1350S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X1350S |
| Bore size | Ø40 mm |
| Stroke | 1350 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 SAI40X1350S 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 SAI40X1350S 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 SI40X1350S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×1350 | 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 SI40X1350S Is Used
Extended Reach Transfer
Pushes products across wide conveyor gaps with a 1350mm stroke, providing 628 N of force at 0.5 MPa for reliable mid-stream routing.
Long Stroke Actuation
Drives tooling carriages over 1350mm distances, requiring external guide rails to prevent rod bending on this non-standard length.
Replacing the Airtac SI40 Standard Cylinder SI40X1350S with the SAI40X1350S
To replace the SI40X1350S, order the SAI40X1350S direct equivalent, verifying the ISO 15552 mounting interface, G1/4 port, and M12x1.25 rod thread. Confirm your mounting accessory (LB, FA, CA, TC) and the -S magnet requirement. When sizing, note the 628 N push at 0.5 MPa; if more force is needed, the neighboring 50mm bore offers 982 N. Because this 1350mm stroke exceeds the 1200mm standard, it is made-to-order and requires external guides to prevent rod bending under side loads. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X1350S
- ✓ 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 SI40X1350S FAQ
Yes, the SI40X1350S is discontinued. The direct replacement is the SAI40X1350S. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 1350mm stroke, 628 N force, G1/4 port, and mounting fixtures.
The 40mm bore features a G1/4 port and M12x1.25 rod thread. It 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 maximum of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X1350S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X1350S replacement — usually within 7-8 hours.