This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X75CB, 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 SI40X75CB
The AirTAC Airtac SI40 Standard Cylinder SI40X75CB is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 75mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X75CB, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke75 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X75CB
- 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 SI40X75CB
The AirTAC SI40X75CB is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 75 mm stroke. It delivers 628 N push and 528 N pull at 0.5 MPa through a G1/4 port. The direct replacement is the SAI40X75CB, matching the CB clevis mount, M12x1.25 rod thread, and 27 mm cushions.
This SKU lacks a magnet (-S), so it cannot accept CS1-B/DS1-B sensors. The SAI upgrade features two Y-shaped piston seals for low start-up pressure. The SAI family also adds SAIL lock and SAIF valve variants absent in the SI line.
Airtac SI40 Standard Cylinder SI40X75CB Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X75CB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X75CB |
| Bore size | Ø40 mm |
| Stroke | 75 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 SAI40X75CB 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 SAI40X75CB 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 SI40X75CB
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×75 | 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 SI40X75CB Is Used
Carton Diverter
Uses the 75 mm stroke and CB clevis to push light packages off a packaging line, relying on the 628 N push force at 0.5 MPa.
Clamp Actuator
Secures medium workpieces in a machining fixture, where the 528 N pull force and adjustable 27 mm cushions safely handle stroke endpoints.
Gate Pusher
Indexes sorting gates in material handling systems, benefiting from the 30-800 mm/s speed range and ISO 15552 direct compatibility.
Replacing the Airtac SI40 Standard Cylinder SI40X75CB with the SAI40X75CB
To replace the SI40X75CB, order the SAI40X75CB. Confirm the ISO 15552 CB clevis mounting interface, 40 mm bore, 75 mm stroke, and G1/4 port (PT/G/NPT thread options). Because this specific SKU has no magnet, it cannot support position sensing; if switches are needed, specify an SAI40X75CBS. The 40 mm bore yields 628 N at 0.5 MPa; if more force is needed, the 50 mm bore provides 982 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external pilot check valve or explore the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X75CB
- ✓ 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 SI40X75CB FAQ
Yes, the SI40X75CB is discontinued. The direct replacement is the SAI40X75CB. It is dimensionally interchangeable per ISO 15552, retaining the same 40 mm bore, 75 mm stroke, CB clevis mount, and G1/4 port.
The 40 mm bore uses 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 maximum of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X75CB
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X75CB replacement — usually within 7-8 hours.