{"id":1406,"date":"2018-10-16T08:57:46","date_gmt":"2018-10-16T06:57:46","guid":{"rendered":"http:\/\/www.mpthitech.com\/?p=1406"},"modified":"2018-10-16T08:57:46","modified_gmt":"2018-10-16T06:57:46","slug":"threads-types-and-designations","status":"publish","type":"post","link":"https:\/\/www.mpthitech.com\/en\/threads-types-and-designations\/","title":{"rendered":"Threads: types and designations"},"content":{"rendered":"

Threads are a constant-section helix-shaped prominence made on a cylindrical sur\u00adface. MPT Srl produces many types of thread such as gas, metric\u00a0 and left-hand threads. <\/strong>Our products are mainly used in the rubber hose holder <\/strong>sector.
\nThread types<\/strong><\/p>\n

How does one distinguish between different thread types<\/strong>? Usually a distinction is made on the basis of the profile shape<\/strong>, and each of them meets the different requirements of functionality and service. There therefore exist:<\/p>\n

1 \u2013 Triangular profile threads;<\/p>\n

2 \u2013 Non-triangular profile threads.<\/p>\n

Triangular profile threads <\/strong>are in turn subdivided as follows:
\nISO metric threads: <\/strong>all thread elements are measured in millimetres.<\/p>\n

Non-metric threads<\/strong>: all or some of the elements are expressed in units of measure\u00adment other than millimetres or in a conventional manner. The main non-metric threads are Whitworth and gas.
\nNon-triangular profile threads<\/strong> are divided into:<\/p>\n

Trapezoidal profile<\/strong>: these threads have a symmetrical isosceles trapezoidal profile.
\nThis profile type has replaced the square or rectangular profile threads which were previously in use. The trapezoidal profile is better because it has greater strength and ease of entry. This is a profile which is usually used for manoeuvring screws, i.e. when, by rotating the screw or the screw nut, a reciprocal movement of two mechani\u00adcal parts is to be obtained. This applies in particular when dealing with large load transmission screws.<\/p>\n

c<\/strong>: this is an asymmetrical thread which is used as the manoeuvring screw in the case of large forces, with a constant direction. Two types are standard\u00adized: normal sawtooth and fine sawtooth. The axial clearance between the screw and the nut is considerable and the supporting side of the screw has an inclination of 3\u00b0.<\/p>\n

\"La<\/a><\/p>\n

Thread designation<\/strong><\/p>\n

How is a thread designation <\/strong>carried out? The main parameters are:<\/p>\n