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Newsletter July 2020

Monograph about type of threads


22 June 2016 / By: rmmcia

Types of threads (III) – metric thread

                           After describing BSP and NPT threads, the most commonly used threads for joining pipes, we would like to introduce the metric thread, with ISO profile, of cylindrical type and the most usual among nuts and bolts.Also known as “metric system threads” or “SI”, they belong to a family of thread pitch standardized in 1946, based on the International System of Units (ISU), beforehand called the Metric Sys...

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04 December 2015 / By: rmmcia

Types of threads (II): NPT threads

In a previous post we talked about BSP parallel threads (cylindrical) or “Gas” threads (G), the ones rmmcia produces at the standard brass fittings catalogue for threaded tube and pipe, according to regulation ISO 228-1.This type of thread Whitworth or BSP, became the British standard from mid XIX century. A couple of decades later the NPT thread (National Pipe Thread) was developed in the United States. William Sellers, an important mechanic engineer and businessman, designed it and showed it i...

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21 January 2015 / By: rmmcia

Types of threads: BSP threads

Rafael Márquez Moro y Cia. uses standard EN ISO 228-1 to produce threads of the standard catalogue brass fittings for threaded tube and pipe. This type of thread is also known as BSP parallel thread (cylindrical) or "Gas" thread (G).The cylindrical thread to ISO 228-1 is a type of Whitworth thread, a name derived from the inventor of it and whose origins date back to England in the mid-nineteenth century. Whitworth shape is based on a thread with thread angle of 55 degrees, with rounded crests a...

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