British Standard Pipe Taper (BSPT) Threads Size Chart. Thick- ness. [mm]. 1/ 4. 1/8. 4. 6. 2. 1/4. today. These threads come in two versions: parallel (BSPP), and tapered (BSPT). 60° thread flank angle, and BSPT has a 55° angle (this can be verified with a. 55 degree Whitworth Thread Form. Whitworth Pipe Threads are used almost exclusively by countries which are otherwise on the metric system.
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BSP thread chart showing pipe thread dimensions of ISO BSPP (parallel straight threads) and IS0 7 BSPT (taper threads).BSP thread uses Whitworth thread. British Standard Pipe threads are similar in function to NPT threads, but are generally not interchangeable. BSPT male threads seal against threads of fixed. THREAD CTG (from 1/2" to 4") British Pipe Thread (Whitworth Form) -- Parallel (BSPP/BSPF) -- (G). Click here to return to the thread data chart page index. .. PIPE THREAD -- BRITISH STANDARD PIPE TAPER -- BSPT PIPE THREAD.
Standardization was needed to facilitate compatibility between different manufacturers and users. The U.
Then, as president of Franklin Institute, he proposed a set of new standards for nuts, bolts and screws to replace the poorly standardized screw thread practice in the U. His thread design gained wide acceptance largely because the flattened peaks and valleys, and the 60 degree angle was easier for ordinary machinists to manufacture and produce. Over two decades earlier in Britain, in , Joseph Whitworth had proposed his thread design which was quickly adopted by many British railroad companies and became a national standard for the United Kingdom called British Standard Whitworth.
Even though up through the s this standard was often used in the United States and Canada, it was not universally accepted, and often competed with many other standards used by a multitude of companies. Sellers thread eventually won out in the U.
Many corporations soon followed and it was adopted as the national standard in the U. Applications NPT and BSP tapered threads are utilized because unlike straight threads, a taper thread can be pulled tightly to make a fluid or air-tight seal.
Straight thread applications are designed to simply hold pieces together, whereas a tapered thread, when torque is applied, will compress and seal the fitting. Applications for tapered threaded pipes provide an effective seal for pipes transporting liquids, gases, steam, and hydraulic fluid.
They are used in a wide range of industries—power plants, gas and oil, chemical, manufacturing, and shipping.
For example, many pressure systems onboard ships use BSP while many applications in the oil and gas industry use NPT fittings. It has been adopted as standard in plumbing and pipe fitting , except in the United States, where NPT and related threads are the standard used.
The thread form follows the British Standard Whitworth standard:. 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.
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. The terminology for the use of G and R originated from Germany G for gas , as it was originally designed for use on gas pipes; R for rohr , meaning pipe. The standard ISO 7 - Pipe threads where pressure-tight joints are made on the threads consists of the following parts:.
The standard ISO - Pipe threads where pressure-tight joints are not made on the threads consists of the following parts:. From Wikipedia, the free encyclopedia. Retrieved 14 July Archived from the original PDF on Retrieved CS1 maint: