Thredolet Dimensions - Complete Reference Guide

Thredolets are self-reinforced branch connection fittings that provide threaded outlets from larger pipes to smaller diameter connections. These specialized pipe fittings, manufactured according to MSS SP-97 standards, offer a reliable and cost-effective solution for creating 90-degree branch connections in piping systems.

Unlike weldolets that require direct welding, thredolets feature female NPT threads that allow for easy screw-in installation of valves, instruments, or smaller pipes. They are commonly available in Class 3000 and Class 6000 pressure ratings, with size ranges typically from 1/8" to 4" for standard applications.

Thredolets are widely used in oil and gas, petrochemical, and industrial piping systems where strong, leak-proof connections are essential. The fitting's design minimizes stress concentrations while providing integral reinforcement, eliminating the need for additional reinforcing plates.

This comprehensive reference provides detailed dimension charts, specifications, and technical data for both size-on-size and reducing thredolet configurations. All dimensions comply with MSS SP-97 standards and ASME B1.20.1 threading requirements.

Whether you're designing a new piping system or specifying replacement fittings, our detailed dimension tables and technical specifications will help ensure proper fitting selection and installation. Browse the links below to access specific dimension charts for your application requirements.