BSPT Pipe Threads. Attached Serial Server Snap Storage. These can be combined into two types of joints: Jointing threads These are pipe threads where pressure-tightness is made through the mating of two threads together. They always use a taper male thread, but can have either parallel or taper female threads. (International standards require all female threads to be parallel.) Longscrew threads These are parallel pipe threads used where a pressure-tight joint is achieved by the compression of a soft material (such as an o-ring seal or a washer) between the end face of the male thread and a socket or nipple face, with the tightening of a backnut. Thread form [ ] The thread form follows the standard: • Symmetrical V-thread in which the angle between the flanks is 55° (measured in an axial plane) • One-sixth of this sharp V is truncated at the top and the bottom • The threads are rounded equally at crests and roots by circular arcs ending tangentially with the flanks where r=0.1373P • The theoretical depth of the thread is therefore 0.6403 times the nominal pitch Pipe thread sizes [ ] At least 41 thread sizes have been defined, ranging from 1⁄ 16 to 18, although of these only 15 are included in ISO 7 and 24 in ISO 228. The size number was originally based on the inner diameter (measured in inches) of a steel tube for which the thread was intended, but contemporary pipes tend to use thinner walls to save material, and thus have an inner diameter larger than this nominal size.

BSPT Thread Dimensions Calculator was developed to show British Standard Pipe Taper Thread form where pressure-tight joints are made on the threads. (outer diameter) of the BSP thread. 2) Take the O. Following chart with thread pitch and threads per inch to find. British Standard Pipe Thread.

In the modern standard metric version, it is simply a size number, where listed diameter size is the major outer diameter of the external thread. For a taper thread, it is the diameter at the 'gauge length' (plus/minus one thread pitch) from the small end of the thread. The taper is 1 to 16, meaning that for each 16 units of measurement increase in the distance from the end, the diameter increases by 1 unit of measurement.

BSPT Thread Dimensions Calculator was developed to show British Standard Pipe Taper Thread form where pressure-tight joints are made on the threads. The calculator shows dimensions, tolerances and designation for jointing pipe threads for thread sizes from 1/16 to 6 according to ISO 7-1 standard. The thread form follows the British Standard Whitworth thread. Some important notes from the ISO 7-1 standard: - Threads are taper external, parallel internal or taper internal and are intended for use with pipes suitable for threading and for valves, fittings or other pipeline equipment interconnected by threaded joints. -An appropriate jointing medium should be used on the thread to ensure pressure-tight joints. -ISO 7-2 gives details of methods of verification of jointing thread dimensions and form and recommended gauging systems. - The symbols for pipe thread type: Rp - Parallel internal threads, Rc - taper (conical) internal threads, R - external threads - Designation: Internal thread - Parallel: Pipe thread ISO 7-Rp 1/2, Internal Thread - Taper: Pipe thread ISO 7- Rc 1/2, External thread - Always taper: Pipe thread ISO 7 - R 1/2 - The ISO 7-1 thread shall be a right-hand thread unless otherwise specified.