Overview
The 1-1/4″ black malleable iron 90° street elbow is a reducing street elbow designed for versatile plumbing, HVAC, and industrial piping applications. With a 90° bend angle, this fitting enables directional changes and connections between female-threaded (FNPT) and male-threaded (MNPT) pipe segments. The black malleable iron construction provides durability, and the Class 150 pressure rating makes it suitable for standard residential and light commercial systems.
Key Features
- Material: Black malleable iron for corrosion resistance and long service life
- Connections: FNPT x MNPT (female and male pipe threads) allow flexible directional changes
- Pressure Rating: Class 150, 300 psi at 150°F; 150 psi working pressure
- Temperature Range: -20°F to 350°F, suitable for air, water, steam, oil, and natural gas
- Standards Compliance: ASTM A197, ASME B16.3, UL listed, FM approved
- Drop-in replacement: Standard street elbow dimensions for easy retrofit into existing systems
Technical Specifications
- Pipe Size: 1-1/4″ nominal
- Fitting Type: 90° reducing street elbow
- Connection Type: FNPT x MNPT (female NPT × male NPT)
- Material: Malleable iron, black finish
- Pressure Class: 150# threaded
- Max Working Pressure: 300 psi @ 150°F
- Steam Pressure: 150 psi @ 350°F
- Operating Temperature: -20°F to 350°F
- Standards: ASTM A197, ASME B1.20.1, B16.3, B16.4, UL, FM
- Applications: Air, water, steam, oil, natural gas, residential, commercial
Typical Applications
This fitting is widely used in:
- Residential and commercial plumbing systems
- Steam and condensate lines in HVAC equipment
- Pneumatic and compressed air systems
- Oil and fuel delivery systems
- Industrial process piping where corrosion resistance is required
- Water supply and drainage systems
Compatibility & Replacements
Compatible With
- NPT (National Pipe Thread) male and female connections
- Standard black malleable iron pipe and fittings
- Systems rated for Class 150 service (air, water, steam, oil, gas)
- Domestic (US-manufactured) piping infrastructure
Replaces / Drop-In Replacement For
- Any standard 1-1/4″ FNPT × MNPT 90° street elbow, Class 150
- Generic malleable iron street elbows of equivalent size and pressure rating
- Worn, damaged, or corroded street elbows in existing systems
Works With
- Female NPT-threaded pipes, fittings, and adapters
- Male NPT-threaded pipes, fittings, and union nuts
- Sealant tape, pipe dope, and thread-locking compounds per ASME B1.20.1
- Standard plumbing and industrial piping systems meeting ASTM A197 and ANSI/ASME standards
