3/4 inch x 12 inch Black Steel Nipple

3/4" x 12" Black Steel Schedule 40 Nipple – Threaded for Code-Compliant Systems

The 3/4" x 12" black steel nipple is fabricated from Schedule 40 seamless or welded carbon steel pipe and threaded to ANSI B1.20.1 standards for compatibility with other threaded steel fittings. This component is built for use in structural and mechanical applications, including low-pressure gas distribution, fire protection systems, and water transport lines where corrosion-resistant coatings are not required by code.

Product Features

• ✅ Material Composition: ASTM A53/A106 Grade B black steel pipe or equivalent, suitable for mechanical and industrial piping systems.
• ✅ Factory-Cut Threads: Tapered NPT threads on both ends conform to ASME/ANSI standards, ensuring a tight and secure connection with proper sealant use.
• ✅ 12" Cut Length: Overall length includes thread allowance, allowing for standard makeup distance when joined with tees, elbows, or couplings.
• ✅ Operating Range: Suitable for non-potable fluid systems, air, steam, oil, and natural gas lines, subject to system design pressure limits.
• ✅ Uncoated Interior and Exterior: Intended for indoor or concealed applications unless additional corrosion protection is applied.

Specifications

• Nominal Pipe Size: 3/4 inch
• Length: 12 inches (threaded both ends)
• Wall Thickness: Schedule 40
• Thread Type: NPT – ANSI B1.20.1
• Compliance: ASTM A733 (nipple dimensions), ASME B31.3 where applicable

Common Applications

This black steel nipple is specified for mechanical piping systems where strength and dimensional consistency are required. Common installations include natural gas piping, compressed air systems, hydronic heating loops (non-potable), and fire sprinkler risers when approved. It is not approved for potable water applications due to its non-galvanized surface and potential for internal corrosion.

Installation Notes

Use with compatible threaded malleable or forged iron fittings. Pipe joint compound or PTFE tape should be applied to male threads to ensure a sealed connection. Install using pipe wrenches with care to avoid thread distortion. Inspect for thread damage and ensure concentricity before pressurizing the system.

Note on Use

Black steel nipples are not intended for underground installation without proper coating or wrapping. Where local code requires corrosion protection or higher-pressure ratings, galvanized or welded options should be considered.

The 3/4" x 12" black steel nipple is a fundamental component for robust pipe installations requiring reliability, dimensional accuracy, and conformance with industrial piping specifications.