This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX175, 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 SI50 Standard Cylinder SI50AX175
The AirTAC Airtac SI50 Standard Cylinder SI50AX175 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 175mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX175, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke175 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX175
- 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 SI50 Standard Cylinder SI50AX175
The AirTAC SI50AX175 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 175mm stroke. Delivering 982N push force at 0.5MPa, it is replaced by the direct replacement SAI50AX175, which shares the exact interface, G1/4 port and M16x1.5 rod thread. This SKU uses an SUS420J2 stainless rod (A) and lacks a magnet, so it cannot accept a position switch.
The SAI50AX175 upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. For load holding, note that standard cushions only decelerate; use an external pilot check valve or the SAIL lock variant.
Airtac SI50 Standard Cylinder SI50AX175 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX175 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX175 |
| Bore size | Ø50 mm |
| Stroke | 175 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| 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, 30 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI50AX175 carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
The SAI50AX175 produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI50 Standard Cylinder SI50AX175
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | 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 SI50 Standard Cylinder SI50AX175 Is Used
Stainless Rod Clamping
Leverages the SUS420J2 rod to securely clamp parts in humid production cells without surface corrosion.
Mid-Stroke Diverting
Provides 175mm travel to push packages between parallel conveyor lines using 982N of thrust.
Replacing the Airtac SI50 Standard Cylinder SI50AX175 with the SAI50AX175
To replace the SI50AX175, order the SAI50AX175. Verify your ISO 15552 mounting accessory (LB, FA, TC, etc.), the G1/4 port, and the 175mm stroke. Because this SKU lacks a magnet, it cannot support CS1-B or DS1-B sensors; if sensing is needed, select an SAI model with the S suffix. Sizing both ways: the 50mm bore yields 982N push at 0.5MPa, while the adjacent 40mm bore offers 628N and the 63mm offers 1559N. For suspended loads, a plain cylinder drifts on air loss; add a pilot check valve or choose the SAIL lock variant. The 175mm stroke is under the 300mm threshold, so rod bending is minimal, but ensure straight alignment.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX175
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI50 Standard Cylinder SI50AX175 FAQ
Yes, the SI50AX175 is discontinued. The direct replacement is the SAI50AX175. It is dimensionally interchangeable per ISO 15552, maintaining the same 50mm bore, 175mm stroke, G1/4 port, and mounting interface.
This double-acting cylinder features a G1/4 air port. It delivers 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, and a theoretical maximum of 200kgf at 1.0MPa. The adjustable air cushion is 30mm at each end.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX175
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX175 replacement — usually within 7-8 hours.