3/4 inch x 4-1/2 inch Black Steel Nipple

3/4" x 4-1/2" Black Steel Nipple – Threaded Schedule 40 Pipe Segment for Mechanical and Plumbing Systems

The 3/4" x 4-1/2" Black Steel Nipple is a factory-threaded Schedule 40 pipe component manufactured from welded or seamless carbon steel. Designed for use in non-potable applications, it serves as a short pipe section for connecting threaded fittings or valves in systems such as gas distribution, low-pressure steam, and compressed air lines.

This nipple features male NPT (National Pipe Thread) threads on both ends, machined to ANSI/ASME B1.20.1 standards. The black coating provides limited surface protection against corrosion during handling and installation in dry indoor environments. It is not intended for potable water systems without additional corrosion control measures.

Product Features

• ✅ Material: Carbon steel pipe, Schedule 40, black coated
• ✅ Nominal Size: 3/4" diameter x 4-1/2" length (threaded both ends)
• ✅ Thread Type: NPT x NPT per ANSI/ASME B1.20.1
• ✅ Pressure Rating: Suitable for low- to moderate-pressure systems (consult applicable codes for system-specific limitations)
• ✅ Standards: Manufactured to ASTM A733 (nipple fabrication) and based on pipe conforming to ASTM A53

Installation Considerations

Apply PTFE tape or approved pipe joint compound to the male threads prior to installation to ensure a secure and leak-resistant seal. Avoid over-torquing to prevent damage to the threads or mating fittings. Ensure compatibility of materials and pressure ratings with system requirements. This fitting is not rated for underground use unless corrosion protection is provided.

Common Applications

Frequently used in the following systems:

• Natural gas and LP gas piping networks
• Low-pressure steam lines and condensate return
• Compressed air systems
• Fire sprinkler system risers (non-potable sections)
• Mechanical and utility piping assemblies

Material Note

Black steel fittings and nipples are generally chosen for their strength, dimensional consistency, and thermal tolerance in dry service environments. They are not recommended for potable water without additional corrosion-resistant coatings or treatment.

The 3/4" x 4-1/2" Black Steel Nipple provides a durable, threaded connection in Schedule 40 piping systems. Designed for structural reliability in mechanical, HVAC, and industrial piping installations requiring short-length transitions.