Minimum = 0.033P for all pitches. See table for maximum. When using L1 gauges to check threads, the thread is within permissible tolerance if the ring gauge face, or plug gauge notch, is +/- 1 turn from being flush with the end of the thread. Example designation: 3/8 - 18 NPT. where: 3/8 = nominal pipe size. 18 = number of threads per inch.

Although BSP is a foreign thread, it isn't metric. This is why it comes in imperial sizes: 1/8, 1/4, 1/2, 3/4, and so on. Thread conforms to ISO 228-1; Port conforms to ISO 1179; Pitch & diameter measured in inches e.g. G1/4-19; Parallel threads require o-ring, crush washer, gasket or metal to metal seal between connectinos for pressure tight

ANSI/ ASME EXTERNAL Screw Thread Size Chart. All units are in inches. Unified Screw Threads per. ANSI/ASME B1.1-1989 (R2001), R2001) Nomenclature, are used. Acceptability criteria are described in ANSI/ASME B1.3M-1992 (R2001). Note: This screw chart is not comprehensive of all available standard threads as provided by the standard.

British Thread Gages. British standard pipe is also referred to as BSP . These type of gages are used for joining or sealing pipes. BSP previously was compliant to a standard called BS-2779. This has since been replaced with ISO standards. British threads fall into two categories, parallel and taper.

Thread pitch is the distance between the threads and is used for metric fasteners. G-threads have a parallel shape in accordance with the DIN-EN-ISO 228-1 standard with flank angle 55 o.

NPT/NPS threads have a 60° angle and have flattened peaks and valleys (Sellers thread form) where as BSP threads have a 55° angle and have rounded peaks and valleys (Whitworth thread form). NPT and BSP thread pitches (threads per inch) are listed below. To determine pitch, use a thread gauge or count the number of threads that fall into a 1

A distinction is made between metric thread types and inch thread types. For metric thread types, the dimensions are given in millimetres. The pitch is calculated by measuring the distance between the first and second tooth. For inch threads, however, the dimensions are given in inches. 1 inch corresponds to 25.4 mm.

Tap. Drill. Diameter mm. G1/8. 1/8" BSPP 9.728 0.907 28. 9.147. 8.566 0.581 8.70. G1/4. 1/4" BSPP 13.157 1.337 19. 12.301 11.445 0.856 11.60.

There are two types of BSP Thread available. One is Parallel threads or we can say Straight threads. The second one is the Taper Thread. BSP is BRITISH STANDARD PIPE THREAD– Also known as Whitworth 55° Thread Form. BSPT is BRITISH STANDARD PIPE TAPER THREAD – Thread form per AS 1722.1, BS 21, ISO 7. BSPP is BRITISH STANDARD PIPE PARALLEL

The most common types of Whitworth thread are: BSPP (G) – British Standard Pipe Parallel. BSPT (R/Rp) – British Standard Tapered Pipe, for pipes and tapered thread. An appropriate

thread. °. Rc, G. NPT, NPTF. AS-FS Series. Speed Controller with Indicator/ Note 2) Use °1/8" tubing. With indicator. Port size. U01. Uni 1/8.