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BSPT & BSPP Threads Dimensions Thread size refers to the nominal bore of the pipe. Subtract approx. 1/4″ (6mm) from thread diameter measurement for nominal pipe size. Pitch is Threads Per Inch (TPI). “Gas”, “R” & “G” also refer to BSP. “Male Iron (Pipe)” may be BSP or NPT. Read More. All of them are mostly in material of carbon steel, alloy steel and stainless steel. BSP Union Dimensions. Usually we manufacture the Class 3000 threaded union according to MSS SP-83. The size is available in 1/8″, 1/4″, 3/8″, 1/2″, 3/4″, 1″, 1 1/4″, 1 1/2″, 2″, 2 1/2″ and 3″. Class 3000 Threaded Union Dimensions. Carbon. BSP Pipe threads are sized according to the thread that can be machined onto that size bore pipe, so a 1/4" BSP thread measures 0.518" or 13.15mm. Tapered threads are used when a shoulder is not available to seal against like threading the OD of a pipe and should be screwed into a female tapered thread. Tapered threads are prone to leakage but. Kowa Technologies Sdn Bhd - BSPP Pipe Threads: Dimensions of 'G' Threads Johor Bahru (JB), Johor. Manufacturer, Supplier, Supply, Supplies Technical Data, Kowa Technologies Sdn Bhd is a company that manufactures and supplies all kinds of industrial supply, tooling & endmills and moulding. Our main office is located in Johor Bahru (JB), Johor. Whitworth Parallel Pipe Thread. DIN ISO 228 (DIN 259) BSPP (British Standard Pipe Parallel) British Standard Pipe Parallel Thread, with sealant compound, (parallel, cylindrical), external = G. The thread angle is 55°. Advertising: Nominal. Diameter. National Pipe threads are similar in function to BSP threads, but are not generally interchangeable. NPSM Threads Dimensions. NPT Thread size & pitch. How to measure your thread: Use a tape rule (or vernier gauge) to measure across the outside of the male thread. Note that a thread that measures 1/2" is not a 1/2" BSP thread. Using the table below we can see that a thread measuring 1/2" is actually a 1/4" BSP thread. Similarly, a thread that measures 1" is actually a 3/4" BSP thread. Pressure tight joints are achieved by the thread alone.. BSPT (tapered) male will mate with a BSPT (tapered) female and the BSPP female swivel. The BSPT male has tapered threads and a 30-degree inverted seat. The thread pitch is different in most cases, and the thread angle is 55 degrees instead of the 60-degree angle found on NPTF threads. British Standard Pipe(BSPP, BSPF) Thread Form r = Basic Radius = * 137329 p h = Basic Depth of Thread = *640327 p p = Pitch = 1/t.p.i. (Threads per Inch) ISO 228, DIN 259, BS2779, JIS B0202 In Japan this thread is known as (PF) Use prefix G for parallel thread.