1-1/4 inch x 18 inch Black Steel Nipple

1-1/4" x 18" Black Steel Nipple – Threaded Schedule 40 Steel Pipe Fitting

The 1-1/4" x 18" Black Steel Nipple is a threaded pipe section used for connecting two female-threaded pipe fittings or system components in natural gas, hydronic heating, or closed-system fluid distribution. Manufactured from welded Schedule 40 black steel pipe, this nipple is designed for non-potable applications where corrosion resistance and high-pressure capacity are required.

Each end is precision-machined with tapered NPT threads per ANSI B1.20.1, allowing for consistent engagement and proper sealing when installed with an approved thread sealant.

Performance Characteristics and Material Details

• ✅ Thread Standard: Male NPT threads (both ends) machined to ANSI standards for secure, leak-resistant connections.
• ✅ Pipe Material: Schedule 40 black steel, suitable for use in low- to medium-pressure systems.
• ✅ Wall Thickness: Complies with ASTM A53/A106 standards for welded or seamless black steel pipe.
• ✅ Nominal Pipe Size: 1-1/4” diameter, designed for use in HVAC, fire protection, and mechanical piping systems.
• ✅ Length: 18 inches end-to-end, providing an extended reach between components without the need for couplings.

Installation Considerations

Ensure pipe threads are clean and undamaged before installation. Apply PTFE thread sealant or pipe joint compound compatible with the system medium (e.g., gas, oil, or steam). Tighten to specification using standard wrenches; avoid overtightening, which may crack fittings or distort threads. Final assembly should be hydrostatically or pneumatically tested per project specs.

Approved Applications

This nipple is designed for use in:

• • Natural gas and propane supply lines
• • Closed-loop hydronic heating systems
• • Fire sprinkler assemblies (where code allows)
• • Compressed air and vacuum service
• • Low-pressure steam systems

Note on Use

Black steel nipples are not approved for potable water systems due to corrosion potential and lack of internal protective lining. Use galvanized or alternative materials when required by code for domestic water systems.

Key Specifications

• Pipe Type: Welded Schedule 40 Black Steel
• Size: 1-1/4" NPT x 18" Length
• Connection Type: Male Threaded Ends (NPT)
• Standards: ANSI B1.20.1, ASTM A53/A106 compliant

The 1-1/4" x 18" Black Steel Nipple provides durability and system integrity in high-demand piping environments. Its precision threading and Schedule 40 construction make it a practical component for professional-grade installations in mechanical, fuel gas, and industrial systems.