This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX140, 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 SI40BX140
The AirTAC Airtac SI40 Standard Cylinder SI40BX140 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 140mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX140, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke140 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX140
- 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 SI40BX140
The AirTAC SI40BX140 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore, 140mm stroke, and a SUS304 stainless steel rod. It delivers 628 N push and 528 N pull at 0.5 MPa via a G1/4 port. The direct replacement is the SAI40BX140, matching the bore, stroke, force, and mounting interface.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. Because this SKU lacks a magnet, it cannot take a sensor.
Airtac SI40 Standard Cylinder SI40BX140 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX140 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX140 |
| Bore size | Ø40 mm |
| Stroke | 140 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 SAI40BX140 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 SAI40BX140 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 SI40BX140
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×140 | 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 SI40BX140 Is Used
Stainless Rod Clamping
Ideal for packaging machinery requiring corrosion resistance, using the SUS304 rod to clamp components with a safe 377 N working load.
Light Transfer Diverting
Provides reliable diverting force on conveyor lines, utilizing the 628 N push at 0.5 MPa to push products smoothly between lanes.
Replacing the Airtac SI40 Standard Cylinder SI40BX140 with the SAI40BX140
To replace the SI40BX140, order the SAI40BX140 to keep the exact ISO 15552 interface, 40mm bore, 140mm stroke, G1/4 port, and SUS304 rod. If you need position sensing, select an SAI model with the -S magnet option, as this non-magnetic SKU cannot accept a switch. For higher force, the 50mm bore yields 982 N push at 0.5 MPa; for lower force, the 32mm bore yields 402 N. If your application requires load holding on air loss, use an external pilot check valve or explore the SAIL or BSAI lock variants, as standard cushions only decelerate. At 140mm stroke, side-load risks are minimal, but always ensure rigid alignment.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX140
- ✓ 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 SI40BX140 FAQ
Yes, the SI40BX140 is discontinued. The direct replacement is the SAI40BX140. It features the same ISO 15552 mounting interface, 40mm bore, 140mm stroke, G1/4 port, and SUS304 stainless steel rod, fitting directly into existing fixtures.
It features a G1/4 air port and provides 628 N push / 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 SAI40BX140
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX140 replacement — usually within 7-8 hours.