This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X15TC, 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 SI40X15TC
The AirTAC Airtac SI40 Standard Cylinder SI40X15TC 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 SAI40X15TC, 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 → SAI40X15TC
- 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 SI40X15TC
The AirTAC SI40X15TC is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 15mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI40X15TC, matching the exact TC trunnion mount, interface, and force.
Because this SKU lacks a magnet, it cannot accept a sensor. The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure.
Airtac SI40 Standard Cylinder SI40X15TC Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X15TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X15TC |
| 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 SAI40X15TC 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 SAI40X15TC 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 SI40X15TC
| 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 SI40X15TC Is Used
Short-Stroke Clamping
Ideal for holding light workpieces in machining fixtures where a compact 15mm travel and 628N force are sufficient.
Ejector Mechanism
Provides rapid part ejection from automated tooling, operating at speeds between 30-800 mm/s without position sensing.
Gate Diversion
Powers small diverter arms on packaging lines, utilising the TC trunnion mount to handle pivoting loads efficiently.
Replacing the Airtac SI40 Standard Cylinder SI40X15TC with the SAI40X15TC
To replace the SI40X15TC, order the SAI40X15TC and confirm the ISO 15552 TC trunnion interface, 40mm bore, 15mm stroke, and G1/4 port. Since this non-magnetic SKU cannot take a switch, you lose sensing. If you need position feedback, switch to an SAI40X15 model with an S suffix and current AirTAC switches. For higher force, the 50mm bore yields 982N push at 0.5MPa; for less mass, the 32mm bore provides 402N. A plain cylinder drifts on air loss, so for load holding use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X15TC
- ✓ 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 SI40X15TC FAQ
Yes, the SI40X15TC is discontinued. The direct replacement is the SAI40X15TC. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 15mm stroke, 628N force, G1/4 port, and TC mounting interface.
This double-acting cylinder features a G1/4 port, a 16mm rod, and M12x1.25 thread. It generates 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical maximum of 128 kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X15TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X15TC replacement — usually within 7-8 hours.