This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX170, 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 SI40BX170
The AirTAC Airtac SI40 Standard Cylinder SI40BX170 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 170mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX170, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke170 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX170
- 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 SI40BX170
The AirTAC SI40BX170 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore, 170mm stroke, and a SUS304 stainless piston rod. Delivering 628N push at 0.5MPa, it is replaced by the SAI40BX170 direct, sharing the same G1/4 port and interface.
The SAI upgrade uses two Y-shaped piston seals for low start-up pressure. Note this SKU lacks a magnet, so it cannot take a sensor.
Airtac SI40 Standard Cylinder SI40BX170 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX170 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX170 |
| Bore size | Ø40 mm |
| Stroke | 170 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 SAI40BX170 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 SAI40BX170 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 SI40BX170
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×170 | 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 SI40BX170 Is Used
Washdown Sorting
Ideal for food or chemical lines, the SUS304 rod resists corrosion while shifting light packages with a 628N push force at 0.5 MPa.
Tool Ejection
Provides reliable 170mm extraction travel for machined parts, utilizing adjustable 27mm air cushions to dampen end-of-stroke impact.
Transfer Diverters
Drives lightweight routing gates on packaging conveyors, operating efficiently at 30-800 mm/s within standard assembly footprints.
Replacing the Airtac SI40 Standard Cylinder SI40BX170 with the SAI40BX170
To replace the SI40BX170, order the SAI40BX170. It drops into existing ISO 15552 fixtures with the same 40mm bore, 170mm stroke, M12x1.25 thread, and G1/4 port. Because this SKU lacks a magnet (-S), it cannot accept a CS1-B/DS1-B sensor; if sensing is needed, switch to an SAI40X170S. For sizing, a 32mm bore yields 402N push, while a 50mm bore yields 982N at 0.5MPa. The cushion only decelerates; for load holding on air loss, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX170
- ✓ 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 SI40BX170 FAQ
Yes, the SI40BX170 is discontinued. The direct replacement is the SAI40BX170. It features the same ISO 15552 mounting interface, 40mm bore, 170mm stroke, G1/4 port, and output force, but adds an upgraded two Y-shaped piston seal for longer life.
The 40mm bore features a G1/4 air port and M12x1.25 rod thread. It delivers 628N push and 528N pull at 0.5 MPa, 879N push at 0.7 MPa, 1130N push at 0.9 MPa, and a maximum theoretical force of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX170
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX170 replacement — usually within 7-8 hours.