This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X170TC, 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 SI50X170TC
The AirTAC SI50 Standard Cylinder SI50X170TC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 170mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X170TC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke170 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X170TC
- 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 SI50X170TC
The AirTAC SI50X170TC is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 170mm stroke. It delivers 982 N push and 825 N pull at 0.5 MPa, utilizing a G1/4 air port and M16x1.5 rod thread. The direct replacement is the SAI50X170TC, retaining the identical TC trunnion mounting interface, force output, and dimensions.
The SAI upgrade introduces a refined piston seal with two Y-shaped one-way elements for lower start-up pressure and extended life. Note this specific SKU lacks a magnet (-S), meaning it cannot accept CS1-B or DS1-B sensors.
Airtac SI50 Standard Cylinder SI50X170TC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X170TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X170TC |
| Bore size | Ø50 mm |
| Stroke | 170 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 SAI50X170TC 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 SAI50X170TC 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 SI50X170TC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | 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 SI50 Standard Cylinder SI50X170TC Is Used
Package Diversion
Drives TC-mounted routing gates on packaging lines, using the 982 N push force at 0.5 MPa to deflect cartons at 30-800 mm/s.
Pallet Handling
Actuates 50 kg vertical lift stops and positioning stops in material handling setups, safely operating within the 589 N working load margin.
Fixture Clamping
Secures mid-weight workpieces in machining fixtures via the ISO 15552 TC trunnion interface, absorbing shock through the 30mm cushions.
Replacing the Airtac SI50 Standard Cylinder SI50X170TC with the SAI50X170TC
To replace the SI50X170TC, order the SAI50X170TC. Verify the ISO 15552 TC trunnion mount, 50mm bore, 170mm stroke, G1/4 port (PT/G/NPT thread options), and the non-magnetic rod. Sizing both ways: a neighboring 63mm bore yields 1559 N push at 0.5 MPa, while a 40mm bore yields 628 N. Because this plain cylinder lacks a magnet, it cannot support position sensing. The air cushion only decelerates the load near stroke ends; it does not hold position on air loss. For load holding, use an external pilot check valve, rod lock, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X170TC
- ✓ 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 SI50X170TC FAQ
Yes, the AirTAC SI50X170TC is discontinued. The direct replacement is the SAI50X170TC. It features the same ISO 15552 TC mounting interface, 50mm bore, 170mm stroke, 982 N force, and G1/4 port, fitting existing fixtures perfectly.
The 50mm bore features a G1/4 air port and M16x1.5 rod thread. Force ratings are: 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, 1767 N push at 0.9 MPa, and a theoretical max of 200 kgf at 1.0 MPa. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X170TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X170TC replacement — usually within 7-8 hours.