1 inch x 7 inch Black Steel Nipple

1" x 7" Black Steel Pipe Nipple – Threaded Fitting for Rigid System Extensions

The 1" x 7" Black Steel Nipple is a straight-length pipe fitting with male NPT threads on both ends, manufactured to connect sections of threaded steel piping in mechanical and plumbing systems. Designed for use in low- to medium-pressure applications, this nipple provides a durable and structurally sound solution for extending piping or facilitating connection between components in black iron systems.

Constructed from Schedule 40 carbon steel pipe, the nipple features a black oxide coating and precision-machined threads conforming to ANSI B1.20.1 specifications. It is appropriate for systems conveying non-potable water, natural gas, steam, air, or oil where corrosion resistance from external galvanization is not required.

Product Features

• ✅ Schedule 40 Carbon Steel: Manufactured to ASTM A53 or equivalent for pressure retention and mechanical integrity.
• ✅ Threaded Male Ends: Both ends feature tapered National Pipe Thread (NPT) for reliable sealing when used with compatible fittings and sealant.
• ✅ 7-Inch Length: Suitable for bridging short pipe spans or compensating for spacing gaps between system components.
• ✅ Black Coated Finish: Oxide treatment provides limited surface protection during handling and installation in non-corrosive environments.

Technical Specifications

• Nominal Size: 1 inch
• Overall Length: 7 inches (including threaded ends)
• Material: Carbon Steel (ASTM A53 Grade A or B)
• Wall Thickness: Schedule 40
• Thread Standard: ANSI/ASME B1.20.1 NPT

Installation Guidelines

Pipe threads must be clean and free from debris before assembly. Apply appropriate thread sealant or PTFE tape to male threads, and tighten using standard pipe wrenches while avoiding over-torqueing. Ensure alignment to avoid cross-threading or joint deformation. Do not use in potable water systems unless otherwise coated and approved.

Applications

Typical uses include connecting black iron piping in gas lines, hydronic heating loops, fire protection systems, and industrial compressed air networks. Often used to extend pipe runs through walls or panels, or where fixed-length spacing is required between fittings or equipment.

Material Note

Black steel fittings should not be installed in systems carrying potable water unless explicitly certified for such use. They are commonly specified in environments where flame resistance, strength, and rigidity are primary considerations.

The 1" x 7" Black Steel Nipple provides a dependable, code-aligned connection solution for rigid piping systems operating in commercial, industrial, and mechanical service applications.