This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X143S, 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 SI40X143S
The AirTAC SI40 Standard Cylinder SI40X143S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 143mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X143S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke143 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X143S
- 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 SI40X143S
The AirTAC SI40X143S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 143mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port. Because this stroke is non-standard, the direct replacement is the current-production SAI40X143S, which shares the exact ISO 15552 mounting interface, bore, force, port and mounting accessories.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The SAI family also introduces lock and valve variants (SAIL, BSAI, SAIF) absent in the legacy SI line.
Airtac SI40 Standard Cylinder SI40X143S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X143S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X143S |
| Bore size | Ø40 mm |
| Stroke | 143 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 SAI40X143S 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 SAI40X143S 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 SI40X143S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×143 | 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 SI40X143S Is Used
Compact Part Ejection
Ideal for pushing machined components out of a fixture, utilizing the 628N push force at 0.5 MPa to reliably clear parts without damaging surfaces.
Replacing the Airtac SI40 Standard Cylinder SI40X143S with the SAI40X143S
To replace the SI40X143S, order the SAI40X143S and confirm the ISO 15552 mounting interface, G1/4 port thread (PT/G/NPT), and your specific mounting accessory (LB, FA, TC, etc.). The -S suffix indicates a built-in piston magnet for legacy CS1-B/DS1-B sensors; the SAI replacement uses current AirTAC switches. If you need more force, the neighbouring 50mm bore offers 982N push at 0.5MPa; if less is required, the 32mm bore provides 402N. Note that 143mm is a non-standard stroke. Because this stroke is under 300mm, standard rod-bending limits apply. A plain SAI cylinder does not hold load without live air—the cushion only decelerates. For load holding on air loss, specify the SAIL or BSAI lock variant, or use an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X143S
- ✓ 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 SI40X143S FAQ
Yes, the SI40X143S is discontinued. The direct replacement is the AirTAC SAI40X143S. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 143mm stroke, force, G1/4 port and mounting fixtures.
This double-acting cylinder uses a G1/4 air port. The thrust ratings are: 628N push and 528N pull at 0.5 MPa, 879N push at 0.7 MPa, 1130N 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 SAI40X143S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X143S replacement — usually within 7-8 hours.