Threaded Elbows 90° & 45° — ASME B16.11

What is a Threaded Elbow?

A threaded (screwed) elbow is machined from a forging with taper pipe threads at each end. Threaded pipe screws into the fitting, so no welding is needed — useful where hot work is restricted or joints must be assembled quickly. Threaded fittings are used on small-bore lines, mostly up to NPS 1½" or 2", in utility, instrument and non-critical services. Street elbows, with one male and one female end, are also covered by ASME B16.11.

Key features

• 90° and 45° elbows per ASME B16.11
• Class 2000, 3000 and 6000
• NPT female threads per ASME B1.20.1, gauged
• No welding needed for assembly
• Street elbows (male × female) available

Specification

Applications

• Instrument air and gas lines
• Utility water and air piping
• Lube oil and hydraulic systems
• Drain and vent lines
• Areas where hot work is restricted

Threaded vs socket weld fittings

Threaded fittings need no welding and can be assembled and taken apart quickly, but cutting threads reduces the effective wall and threaded joints can leak under vibration or thermal cycling. Socket weld fittings are fillet welded and give a stronger, leak-tight joint. Most piping specifications allow threaded joints only in utility or low-hazard services, and require socket weld for hydrocarbons and higher pressures.