This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X15SCA, 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 SI40X15SCA
The AirTAC Airtac SI40 Standard Cylinder SI40X15SCA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 15mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X15SCA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke15 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X15SCA
- 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 SI40X15SCA
The AirTAC SI40X15SCA is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 15 mm stroke. It delivers 628 N push force at 0.5 MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI40X15SCA, a direct upgrade retaining the exact ISO 15552 mounting interface, CA clevis, and output force.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. It also introduces SAIL, SAIF, and BSAI variants absent from the SI line. The original -S magnet supports CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40X15SCA Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X15SCA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X15SCA |
| Bore size | Ø40 mm |
| Stroke | 15 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 SAI40X15SCA 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 SAI40X15SCA 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 SI40X15SCA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×15 | 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 SI40X15SCA Is Used
Short-Stroke Clamping
Ideal for holding light workpieces in machining fixtures where a compact 15 mm stroke and 628 N force secure parts without flexing.
Package Diverting
Provides rapid actuation at 30-800 mm/s to push small cartons off a packaging line, utilizing the CA clevis for smooth pivot motion.
Ejector Mechanisms
Delivers precise 32 kg vertical lift capability to eject molded components from automated assembly machinery safely.
Replacing the Airtac SI40 Standard Cylinder SI40X15SCA with the SAI40X15SCA
To replace the SI40X15SCA, order the SAI40X15SCA. Verify the ISO 15552 interface, 40 mm bore, 15 mm stroke, G1/4 port, and CA clevis mounting. The -S magnet enables CS1-B/DS1-B legacy sensors, though the SAI uses current AirTAC switches. If sizing up, a 50 mm bore offers 982 N at 0.5 MPa; if sizing down, a 32 mm bore yields 402 N. Note that a standard cylinder drifts on air loss, as cushions only decelerate. For load holding, use an external pilot check valve or the SAIL/BSAI lock variants. Rod material options include carbon steel, SUS420J2, or SUS304.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X15SCA
- ✓ 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 SI40X15SCA FAQ
Yes, the SI40X15SCA is discontinued. The direct replacement is the AirTAC SAI40X15SCA. It shares the same ISO 15552 mounting interface, 40 mm bore, 15 mm stroke, G1/4 port, and CA clevis, fitting existing fixtures perfectly.
The 40 mm bore features a G1/4 port and provides 628 N push and 528 N pull at 0.5 MPa. It delivers 879 N push at 0.7 MPa, 1130 N at 0.9 MPa, and a theoretical maximum of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X15SCA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X15SCA replacement — usually within 7-8 hours.