3/8 inch x Close Brass Nipple

3/8" x Close Brass Pipe Nipple – Lead-Free, NPT Threaded Fitting

The 3/8" x Close brass pipe nipple is a short, fully threaded fitting used for joining two female-threaded components in plumbing, HVAC, or gas distribution systems. Manufactured from lead-free brass in accordance with ANSI and NSF standards, this nipple is suitable for potable water, air, and hydraulic applications where compact spacing and corrosion resistance are essential.

This component features male National Pipe Tapered (NPT) threads on both ends and is machined to close dimensions, meaning minimal spacing between fittings once installed. The full-thread design is intended for rigid, space-constrained assemblies requiring high-quality mechanical connections.

Technical Specifications

• Nominal Size: 3/8" NPT x Close
• Length: Varies by manufacturer (typically ~1" overall, fully threaded)
• Material: Lead-free brass (compliant with ASTM B62 or equivalent)
• Thread Type: NPT (ANSI B1.20.1)
• Certifications: NSF/ANSI 61 and 372 certified for potable water applications

Performance Characteristics

• ✅ Lead-Free Compliance: Meets federal and state regulations for potable water system components
• ✅ Corrosion Resistant: Brass composition resists dezincification and stress cracking
• ✅ Thermal & Pressure Tolerance: Suitable for fluid systems with working pressures up to 200 psi and operating temperatures up to 250°F
• ✅ Compact Fit: Ideal for tight piping layouts requiring minimal overall fitting length
• ✅ High Machinability: Ensures thread integrity and leak-tight performance when properly installed

Application Scope

Used in potable water supply lines, fuel oil systems, pneumatic lines, and industrial fluid transfer applications, the 3/8" x Close brass nipple is a standard component in both residential and commercial plumbing systems. It is often installed in manifolds, pump assemblies, meter sets, or mechanical junctions where space and material integrity are critical.

Installation Considerations

Apply PTFE tape or approved thread sealant to male threads before assembly. Do not overtighten; hand-tighten followed by a wrench turn is typically sufficient to create a leak-resistant joint. Close nipples are not recommended for connections requiring rotational alignment post-installation due to their fully threaded nature.