This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX175, 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 SI40BX175
The AirTAC Airtac SI40 Standard Cylinder SI40BX175 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 175mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX175, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke175 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX175
- 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 SI40BX175
The AirTAC SI40BX175 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 175mm stroke. Delivering 628N push force at 0.5MPa, it is directly replaced by the SAI40BX175 direct upgrade, which shares the exact same interface, G1/4 port, and M12x1.25 rod thread. The SAI features an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life.
This specific SKU uses a SUS304 stainless piston rod for corrosion resistance but lacks the -S magnet, meaning it cannot accept CS1-B or DS1-B sensors. The SAI family also introduces variants the SI lacked, such as the SAIL air-released lock and SAIF built-in valve. Note that a plain cylinder does not hold load without live air; the cushion only decelerates. For load holding, consider the SAIL or BSAI clamp-lock variant.
Airtac SI40 Standard Cylinder SI40BX175 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX175 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX175 |
| Bore size | Ø40 mm |
| Stroke | 175 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 SAI40BX175 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 SAI40BX175 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 SI40BX175
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×175 | 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 SI40BX175 Is Used
Package Diverting
Ideal for pushing lightweight to medium cartons off a packaging line using its 628N push force and 175mm travel distance.
Stainless Rod Duty
The SUS304 piston rod excels in mildly corrosive sorting tasks where moisture or washdowns would degrade standard carbon steel.
Pallet Stops
Functions as a reliable 175mm stroke stopper gate for low-inertia pallets, decelerating loads smoothly via its adjustable cushions.
Replacing the Airtac SI40 Standard Cylinder SI40BX175 with the SAI40BX175
To replace the discontinued SI40BX175, order the SAI40BX175 direct cylinder, matching the 40mm bore, 175mm stroke, G1/4 port, and ISO 15552 mounting. Because this SKU lacks a magnet, it cannot support position sensing; if switches are needed, select an SAI40X175S and use current AirTAC switches. When sizing, note the 40mm bore yields 628N push at 0.5MPa; if less force is acceptable, a 32mm bore provides 402N, while a 50mm bore offers 982N. For applications requiring load holding on air loss, a standard cylinder drifts—use an external pilot check valve or the SAIL lock variant. At 175mm stroke, side-load risks are low, but always ensure guide alignment to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX175
- ✓ 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 SI40BX175 FAQ
Yes, the SI40BX175 is discontinued. The direct replacement is the SAI40BX175. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 175mm stroke, 628N force, G1/4 port, and mounting interface.
The 40mm bore delivers 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. Operating speed is 30-800mm/s. It uses a G1/4 port and a 27mm adjustable cushion at each end.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX175
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX175 replacement — usually within 7-8 hours.