This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X127S, 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 SI40X127S
The AirTAC Airtac SI40 Standard Cylinder SI40X127S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 127mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X127S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke127 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X127S
- 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 SI40X127S
The AirTAC SI40X127S is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 127 mm stroke. It delivers 628 N push force at 0.5 MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI40X127S, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, output force, and port size.
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 SAIL, SAIF, and BSAI lock variants absent from the SI line.
Airtac SI40 Standard Cylinder SI40X127S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X127S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X127S |
| Bore size | Ø40 mm |
| Stroke | 127 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 SAI40X127S 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 SAI40X127S 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 SI40X127S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×127 | 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 SI40X127S Is Used
Component Clamping
Secures medium workpieces with 628 N push force at 0.5 MPa during machining operations.
Package Diverting
Actuates 127 mm stroke diverting arms to route lightweight to medium goods on assembly lines.
Replacing the Airtac SI40 Standard Cylinder SI40X127S with the SAI40X127S
To replace the SI40X127S, order the SAI40X127S. Confirm your ISO 15552 mounting fixture (LB, FA, TC, etc.), the G1/4 port thread (PT/G/NPT), and the M12x1.25 rod end. Because this SKU includes the -S magnet, it supports CS1-B/DS1-B legacy sensors; the SAI replacement uses current AirTAC switches. If sizing up or down, neighbouring bores are 32 mm (402 N push @0.5 MPa) and 50 mm (982 N push @0.5 MPa). A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock or pilot check valve for load holding, or specify the SAIL/BSAI lock variant. Rod material options include carbon steel, SUS420J2 (A), and SUS304 (B).
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X127S
- ✓ 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 SI40X127S FAQ
Yes, the SI40X127S is discontinued. The direct replacement is the SAI40X127S. It is dimensionally interchangeable per ISO 15552, keeping the same 40 mm bore, 127 mm stroke, G1/4 port, and mounting interface.
The 40 mm bore uses a G1/4 air port. It generates 628 N push and 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, 1130 N push at 0.9 MPa, and a theoretical maximum force of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X127S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X127S replacement — usually within 7-8 hours.