This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X175SH, 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 SI40X175SH
The AirTAC Airtac SI40 Standard Cylinder SI40X175SH 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 SAI40X175SH, 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 → SAI40X175SH
- 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 SI40X175SH
The AirTAC SI40X175SH is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 175mm stroke. It delivers 628 N push force at 0.5 MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI40X175SH, a direct replacement retaining the exact interface, bore, stroke, force and mounting accessories. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Because your SKU includes the -S magnet, it supports legacy CS1-B/DS1-B switches, while the SAI successor uses current AirTAC sensors. The -H code specifies a Viton H seal, extending operating temperature from the standard -20 to +70 C range up to 0-150 C.
The SAI family also introduces variants the SI lacked, including the SAIL air-released lock, the SAIF built-in 4M valve (bores 32-100) and the BSAI clamp-lock. Note that a plain cylinder drifts on air loss; the cushion only decelerates near stroke end, so use an external rod lock or pilot check valve for load holding.
Airtac SI40 Standard Cylinder SI40X175SH Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X175SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X175SH |
| 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 SAI40X175SH 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 SAI40X175SH 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 SI40X175SH
| 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 SI40X175SH Is Used
Hot-End Part Ejection
Utilizes the Viton H seal to reliably eject molded components from 150 C environments, using the 628 N push force to break part adhesion.
Diversion Gate Actuation
Drives routing flaps on packaging lines with a 175mm stroke, moving loads safely within the 377 N working capacity limit.
Vertical Lift Stops
Raises 32 kg pallet stops in sorting hubs; pair with a pilot check valve to prevent drift on air loss, as cushions only decelerate.
Replacing the Airtac SI40 Standard Cylinder SI40X175SH with the SAI40X175SH
To replace the discontinued SI40X175SH, order the SAI40X175SH direct equivalent, verifying the ISO 15552 mounting interface, 40mm bore, 175mm stroke, G1/4 port (PT/G/NPT thread), Viton H high-temp seal and the -S magnet for position sensing. If you need more force, the neighbouring 50mm bore provides 982 N push at 0.5 MPa; if less is acceptable, the 32mm bore offers 402 N. A plain cylinder does not hold a load without live air—the cushion only decelerates—so for vertical or suspended loads consider the SAIL lock variant, BSAI clamp-lock, or an external pilot check valve. Since the 175mm stroke is below the 300mm side-load threshold, rod-bending is minimal, but always ensure proper guide alignment to prevent premature seal wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X175SH
- ✓ 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 SI40X175SH FAQ
Yes, the SI40X175SH is discontinued. The direct replacement is the AirTAC SAI40X175SH. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 175mm stroke, G1/4 port, 628 N force and mounting fixtures. The SAI simply upgrades the piston seal to two Y-shaped elements for lower start-up pressure.
The 40mm bore features a G1/4 air port and a 16mm rod. 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 SAI40X175SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X175SH replacement — usually within 7-8 hours.