Chart No 3- British Association (BA) Threads British Association Threads Dimensions in Inches except where stated Thread Form Data Tapping Drill Clearance Drill Size O/Diameter Core Pitch Depth Radius Effective Dia T.P.I Dec / Met / Frac Dec / Met / Frac 0BA 0.2362 0.1890 0.0394 0.0236 0.0072 -- 25.38 0. - 5.10mm 0.2362 - 6.00mm

Taper threads, British Standard Pipe Taper thread (BSPT), whose diameter increases or decreases along the length of R 1/16", Rp 1/16", 28, 7.72, 6.56.

Diameter and pitches are the same for ISO 7-1 and ISO 228 threads. ISO 7-1 is BSPT (R/Rp) - British Standard Tapered Pipe where R - tapered male with external threads Rp - cylindrical with internal threads Rc - tapered with internal threads G-threads have a parallel shape in accordance with the DIN-EN-ISO 228-1 standard.

RP Thread Tracker Just a link to my Rp Thread Tracker list, it may not be up to

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

Rp (BSPPL) SEALING PIPE THREAD PARALLEL (55º) Rp 1/8 28 8.6 Rp 1/4 19 11.5 Rp 3/8 19 15.0 Rp 1/2 14 18.5 Rp 3/4 14 24.0 Rp 1 11 30.2 Rp 1-1/4 11 39.0 Rp 1-1/2 11 45.0 Rp 2 11 56.4 Pg (Steel Conduit) (80º) Pg7 20 11.3 Pg9 18 13.9 Pg11 18 17.3 Pg13.5 18 19.1 Pg16 18 21.2 Pg21 15 26.8 THREAD FORMING (FLUTELESS TAPS) Tap Size Pitch mm Tapping

Male Thread. Diameter. Thread. Diameter. Pipe Minor. Diameter mm. Pipe Major. Diameter mm. Tapping. Drill Size mm. TPI Pitch mm. R 1/16". Rp 1/16".

What does Rp thread mean? The Rp thread is a designation for BSPP (British Standard Pipe Parallel). For example, Rp 1/4. refers to the threaded end of a fitting or pipe which is 1/4 inch trade size (not actually 0.25 inches), and having British Standard Parallel Pipe threads.

A male G thread and G thread together do not have sealing effect, it is mainly used in wire tube / cable tube which do not require sealing effect. (2) Sealing pipe thread, these kinds of thread have sealing effect after screwed. There are three types of sealing pipe threads: R thread: tapered male thread. Rc thead: tapered thread.

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. Example: G1/2 11 /

Block 3 R(size) For external taper thread: or Rp ( size) For internal parallel thread Pipe Thread EN10226 - Rp 3/4 BS EN ISO 0228 -Thread Sizes.