Description
Cast Iron Straight Tee
ASC / SCI Fig. 3358 Cast Iron Straight Tee provides a 90-degree threaded branch connection in compatible Class 125 piping systems.
Manufactured from cast iron conforming to ASTM A126, the Fig. 3358 features three female NPT connections and is available with a black or hot-dip galvanized finish for industrial, commercial, water, and mechanical piping applications.
Product Highlights
- ASC / SCI Fig. 3358
- Straight tee configuration
- ASTM A126 cast iron
- Class 125 fitting design
- Three female NPT connections
- UL/ULC Listed and FM Approved
Technical Specifications
| Product Type | Cast Iron Straight Tee |
|---|---|
| Brand | ASC / SCI |
| Figure | 3358 |
| Configuration | Straight Tee |
| Material | Cast Iron |
| Material Standard | ASTM A126 |
| Fitting Standard | ASME B16.4 Class 125 |
| Threads | NPT per ASME B1.20.1 |
| Finish | Black or Hot-Dip Galvanized per ASTM A153 Class A |
| Agency Approvals | UL/ULC Listed and FM Approved |
Construction Details
The SCI Fig. 3358 Straight Tee is manufactured from cast iron conforming to ASTM A126 for use in compatible Class 125 threaded piping systems.
Fitting dimensions conform to ASME B16.4 Class 125, while all three connections use NPT threads in accordance with ASME B1.20.1.
The straight tee configuration provides two inline connections with a third connection positioned at 90 degrees, allowing a branch line to be added to the main piping run.
Straight Tee Design & Applications
Straight Tee Design
- Three female threaded ends
- 90° branch connection
- Straight-through main run
- Class 125 construction
- Cast iron body
Typical Applications
- Industrial piping systems
- Commercial piping systems
- Water piping applications
- Mechanical piping systems
- Threaded branch connections
Installation & Selection Considerations
- Confirm Fig. 3358 is required.
- Verify all NPT connections.
- Confirm Class 125 compatibility.
- Use suitable thread sealant.
- Avoid excessive tightening.

Use the ASC / SCI Fig. 3358 product submittal to confirm cast iron construction, Class 125 requirements, NPT threads, finish options, approvals, and straight tee specifications.
Need Help Selecting a Cast Iron Straight Tee?
Need help confirming the threaded connections, Class 125 requirements, finish, or compatibility with your piping system? The GetPipe.com Team can help.
Frequently Asked Questions
What is the SCI Fig. 3358?
The Fig. 3358 is a cast iron straight tee designed to provide a 90-degree branch connection in a threaded piping system.
What material is the straight tee?
The Fig. 3358 is manufactured from cast iron conforming to ASTM A126.
What fitting class is the Fig. 3358?
The straight tee dimensions conform to ASME B16.4 Class 125 requirements.
What type of threads does the tee use?
The fitting uses female NPT threaded connections conforming to ASME B1.20.1.
What is a straight tee used for?
It provides a 90-degree branch from a straight threaded piping run.
What finishes are available?
ASC specifies black or hot-dip galvanized finishes, with the galvanized finish conforming to ASTM A153 Class A.
Is the Fig. 3358 UL/ULC Listed and FM Approved?
Yes. ASC identifies its cast iron threaded fittings as UL/ULC Listed and FM Approved, subject to applicable listing and approval limitations.
What should I confirm before ordering?
Confirm the Fig. 3358 configuration, NPT connections, Class 125 requirements, and required finish.
Important Ordering & Installation Notes
- Confirm Fig. 3358 configuration.
- Verify all NPT connections.
- Select the required finish.
- Apply suitable thread sealant.
- Avoid excessive installation torque.