This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X12SCB, 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 SI40X12SCB
The AirTAC Airtac SI40 Standard Cylinder SI40X12SCB is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 12mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X12SCB, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke12 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X12SCB
- 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 SI40X12SCB
The AirTAC SI40X12SCB is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 12mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port. AirTAC replaced it with the SAI40X12SCB, a direct upgrade retaining the same interface, force, and CB clevis mount.
The SAI features an upgraded piston seal with two Y-shaped elements for low start-up pressure. The original SI-S magnet works with CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40X12SCB Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X12SCB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X12SCB |
| Bore size | Ø40 mm |
| Stroke | 12 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 SAI40X12SCB 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 SAI40X12SCB 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 SI40X12SCB
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×12 | 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 SI40X12SCB Is Used
Short-Stroke Clamping
Ideal for holding parts in machining fixtures where a compact 12mm stroke and 628N force at 0.5MPa securely lock components in place.
Package Diversion
Provides rapid sorting actuation on packaging lines, utilizing the 30-800mm/s speed range and CB clevis mount to pivot diverter arms efficiently.
Replacing the Airtac SI40 Standard Cylinder SI40X12SCB with the SAI40X12SCB
To replace the SI40X12SCB, order the SAI40X12SCB. Verify the ISO 15552 CB clevis mounting, 40mm bore, 12mm stroke, G1/4 port, and the -S magnet for CS1-B/DS1-B switches. For higher force, the 50mm bore yields 982N push at 0.5MPa; for lighter loads, the 32mm bore yields 402N. This plain cylinder does not hold load on air loss; the cushion only decelerates. For load holding, use the SAIL lock variant or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X12SCB
- ✓ 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 SI40X12SCB FAQ
Yes, the SI40X12SCB is discontinued. The direct replacement is the SAI40X12SCB. It shares the identical ISO 15552 mounting interface, 40mm bore, 12mm stroke, output force, and G1/4 port, fitting directly into your existing CB clevis fixtures.
The 40mm bore features a G1/4 port and provides 628N push / 528N pull at 0.5MPa, 879N push at 0.7MPa, and 1130N push at 0.9MPa. The theoretical maximum force is 128kgf at 1.0MPa. It uses a 16mm rod with an M12x1.25 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X12SCB
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X12SCB replacement — usually within 7-8 hours.