This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X100SFTC, 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 SI40X100SFTC
The AirTAC Airtac SI40 Standard Cylinder SI40X100SFTC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 100mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X100SFTC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke100 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X100SFTC
- 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 SI40X100SFTC
The AirTAC SI40X100SFTC is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 100mm stroke. It delivers 628N push force at 0.5MPa through a G1/4 port. The direct replacement is the SAI40X100SFTC, matching the bore, stroke, force, port, and FTC mounting interface for a seamless fixture swap.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and longevity. The -S magnet pairs with legacy CS1-B/DS1-B switches, while the SAI uses current AirTAC sensors.
Airtac SI40 Standard Cylinder SI40X100SFTC Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X100SFTC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X100SFTC |
| Bore size | Ø40 mm |
| Stroke | 100 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 SAI40X100SFTC 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 SAI40X100SFTC 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 SI40X100SFTC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×100 | 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 SI40X100SFTC Is Used
Component Clamping
Secures mid-weight machined parts during milling or drilling operations using the 628N push force at 0.5MPa.
Package Diverting
Actuates sorting gates on packaging lines where a 100mm stroke and 32kg safe vertical lift capacity are required.
Light Pressing
Performs light-duty bearing insertion or pin pressing tasks within automated assembly fixtures.
Replacing the Airtac SI40 Standard Cylinder SI40X100SFTC with the SAI40X100SFTC
To replace the SI40X100SFTC, order the SAI40X100SFTC keeping the 40mm bore, 100mm stroke, G1/4 port, FTC trunnion mount, and -S magnet. The SAI family also adds SAIL, SAIF, and BSAI lock/valve variants. If sizing alternatives, a 32mm bore yields 402N push at 0.5MPa, while a 50mm bore yields 982N. Note: a plain cylinder drifts on air loss as cushions only decelerate; use an external rod lock or pilot check valve for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X100SFTC
- ✓ 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 SI40X100SFTC FAQ
Yes, the SI40X100SFTC is discontinued. The direct replacement is the SAI40X100SFTC. It features the same ISO 15552 mounting interface, 40mm bore, 100mm stroke, G1/4 port, and FTC trunnion mount, fitting existing fixtures perfectly.
This 40mm bore cylinder has a G1/4 air port and M12x1.25 rod thread. Force ratings are: 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical max of 128kgf at 1.0MPa. Speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X100SFTC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X100SFTC replacement — usually within 7-8 hours.