This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X175H, 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 SI40X175H
The AirTAC Airtac SI40 Standard Cylinder SI40X175H 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 SAI40X175H, 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 → SAI40X175H
- 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 SI40X175H
The AirTAC SI40X175H is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 175 mm stroke. Featuring a high-temperature Viton H seal (0 to 150 C), it delivers 628 N push force at 0.5 MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI40X175H.
The SAI40X175H is a direct replacement matching the exact ISO 15552 mounting interface, M12x1.25 rod thread, and 27 mm cushions. It upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure. Note this SKU lacks a magnet and cannot accept sensors.
Airtac SI40 Standard Cylinder SI40X175H Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X175H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X175H |
| 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 SAI40X175H 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 SAI40X175H 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 SI40X175H
| 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 SI40X175H Is Used
Hot End Ejection
Clamping and ejecting parts near heated molds using the Viton H seal to withstand 150 C ambient temperatures.
Diverting Arm
Actuating a routing gate on a packaging line where 628 N push force at 0.5 MPa easily overcomes friction.
Replacing the Airtac SI40 Standard Cylinder SI40X175H with the SAI40X175H
To replace the SI40X175H, order the SAI40X175H and confirm the ISO 15552 mounting fixture, G1/4 port, and M12x1.25 thread. Because this unit has no -S magnet, it cannot support legacy CS1-B/DS1-B sensors; order a magneted SAI equivalent if position sensing is required. For sizing down, a 32 mm bore offers 402 N push at 0.5 MPa; sizing up to 50 mm provides 982 N. If your application needs load holding on air loss, a plain cylinder drifts—use an external pilot check valve or the SAIL/BSAI lock variants. The 175 mm stroke is under the 300 mm side-load threshold, but always guide the rod to prevent bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X175H
- ✓ 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 SI40X175H FAQ
Yes, the SI40X175H is discontinued. The direct replacement is the SAI40X175H. It shares the identical ISO 15552 mounting interface, 40 mm bore, 175 mm stroke, G1/4 port, and output force, fitting existing fixtures perfectly.
The 40 mm bore uses a G1/4 port. At 0.5 MPa it provides 628 N push and 528 N pull force. At 0.7 MPa push is 879 N, and at 0.9 MPa it is 1130 N. The theoretical maximum force is 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X175H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X175H replacement — usually within 7-8 hours.