Black Pipe & Fittings

Black Pipe & Fittings deliver rugged performance for gas distribution, hydronic heating, and other high-heat or high-pressure needs. Made from uncoated steel pipe and paired with malleable iron or forged steel fittings, these components use tapered NPT threads to create tight, serviceable joints that stand up to vibration and heat. They’re chosen for natural gas and propane lines, boiler piping, and select industrial systems. With no zinc coating, black steel is not recommended for potable water and may corrode in constantly wet service.

Common sizes range from 1/8 inch to 6 inch nominal pipe size in Schedule 40 or Schedule 80 wall thicknesses. You’ll find straight lengths, factory-cut nipples, and a full selection of fittings that conform to ASME B1.20.1 for threads and ASME B16.3/B16.4 for fittings. The result is dependable compatibility across brands and easy replacement in the field.

Choose from:
- Elbows (45°/90°) and street elbows for tight offsets
- Tees and crosses for branching
- Couplings, unions, and flanges for assembly and service
- Caps, plugs, bushings, and reducers for transitions
- Pipe nipples and swage nipples for spacing and size changes

Installation is straightforward: cut square, ream the bore, apply gas-rated PTFE tape or pipe thread sealant, tighten hand-snug plus two to three wrench turns, and support runs at code-compliant intervals. Pressure-test and leak-check with a manometer or approved solution. Use two wrenches to avoid stressing joints. Always follow local codes and appliance manufacturer instructions.

Whether you’re building a gas manifold or expanding a shop air header, black pipe provides strength, temperature tolerance, and long service life with readily available parts. Filter by size, schedule, and fitting type to speed selection, and stock common nipples and couplings to reduce downtime. Shop black steel pipe, black iron fittings, NPT fittings, and Schedule 40 black pipe to complete your project with confidence.