Sigma 819907130 Hex Head Pipe Bushing 1/2x1-1/4 in 150lb

Product Description

The SIGMA 819907130 is a FIG 3383 hex head pipe bushing used to reduce a larger female-threaded fitting or pipe to a smaller male-threaded connection. It measures 1/2 x 1-1/4 inches nominal, with a male NPT (MNPT) outlet and a female NPT (FNPT) inlet. Constructed from malleable iron with a hot-dip galvanized finish, this bushing carries a 150 lb pressure rating and is suited for low-pressure piping systems. The hex head design allows standard wrench engagement for reliable torque during installation. Licensed plumbers and pipefitters install this type of fitting in threaded iron pipe assemblies across a range of commercial and residential applications.

This bushing is a standard threaded reducer used in water, air, and low-pressure steam distribution systems. The galvanized malleable iron construction resists corrosion in exposed or wet environments. It is commonly found in plumbing rough-in work, mechanical room piping, compressed air lines, and fire protection system branches where a threaded reduction from 1-1/4 inch to 1/2 inch is required. The FNPT x MNPT configuration integrates directly into standard Schedule 40 black or galvanized iron pipe assemblies.

Key Features

• 1/2 x 1-1/4 inch nominal size reduces larger threaded openings to smaller male NPT connections
• MNPT x FNPT end style for direct integration into threaded pipe systems
• 150 lb pressure rating suitable for low-pressure water, air, and steam service
• Malleable iron construction provides strength and resistance to impact and vibration
• Galvanized finish delivers corrosion protection in wet or outdoor environments
• Hex head design allows engagement with standard pipe wrenches or open-end wrenches

Compatibility

Designed as an OEM-style replacement and standard component for 150 lb malleable iron threaded pipe systems requiring a 1-1/4 inch female to 1/2 inch male NPT reduction.

Installation Notes

Installation is performed by licensed plumbers or pipefitters working on threaded iron pipe systems. Always depressurize and drain the line before removing or installing threaded fittings. Apply thread sealant tape or paste to the male threads before assembly, following local plumbing code requirements such as those in the IPC or IFGC. Do not overtighten; engage threads by hand first, then tighten with a wrench to achieve a leak-free seal without stressing the fitting.

Technical Specifications

• Nominal Size: 1/2 x 1-1/4 inches
• End Style: MNPT x FNPT
• Pressure Rating: 150 lb
• Material: Malleable Iron
• Finish: Galvanized
• Figure Number: FIG 3383

Standard Information

• Brand: SIGMA
• Manufacturer Part Number: 819907130