OfPipe D. Technical Bulletin, #16 NPT Taper Pipe Thread Gages, defines the L-1 basic hand tight engagement on NPT product threads. This same L-1 length applies to NPTF threads. It is the theoretical length of assembly (hand-tight) if both parts had perfect thread form and taper and were exactly at the nominal size. • How to? You can make ads in the Engineering ToolBox more useful to you! The NPT - National Pipe Taper Threads - is based on the Briggs Standard Pipe Thread. Drill sizes Anglebetween sides of thread is 60 degrees. Thread taper, is 3⁄4 inch per foot. All units are in inches. National Standard Taper Pipe Threads Size NPT Chart - Includes both External and internal Pipe Thread Data. The taper rate for all NPT threads is 1⁄16 (3⁄4 inch per foot) measured by the change of diameter (of the pipe thread) over Subtractapprox. 1/4″ (6mm) from thread diameter measurement for nominal pipe size. NPT – NPT : NPT to fixed NPT female sealing is made through direct metal to metal contact. The use of Volz Thread Sealant is recommended. NPT – NPSM : NPT male with conical 30° seat (60° included angle) seal against matching conical 30° seat of R3/4" Female Thread Rc 1/8" Rc 1/4" Rc 3/8" Rc 1/2" Rc 3/4" 10.2 13.6 17.2 21.7 27.1 8.3 11.0 14.5 18.0 23.5: 7.4 11.0 11.0 15.0 16.3 7.4 11.0 11.4 15.0 16.3: G Thread Connection Cylindrical Pipe Thread Connection According to ISO 228/1 (other common descriptions are BSP, R) Male: ie. G 1/4" Female (ISO 1179): ie. G 1/4" Male Thread G 1/8" G 1 38 in. and 10 mm 7500 psi, 500 bar, 50 MPa 1/2 in. and 12 mm 6000 psi, 400 bar, 40 MPa Male NPT 1/8 in. 6000 psi, 400 bar, 40 MPa ASME B1.20.1 1/4 and 1/2 in. 15 000 psi, 1000 bar, 100 MPa Male ISO Parallel Gauge Thread (EN) Male ISO Tapered Thread R1/8 (PT) 6000 psi, 400 bar, 40 MPa ISO 7/1 R1/4 (PT) JIS B0203 Series UNC / UNF / UNEF / UN. Class: 1A, 2A, 3A, 1B, 2B or 3B. Diameter: From 1/4″ and above the diameters are given in inch fractions. For example 1/4″, 3/4″, 1 1/4″. Below 1/4″ the diameters are given by a series of numbers from #0 to #12. Each “number” describes an arbitrary diameter as shown in the below table. 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). Vay Nhanh Fast Money.

3 8 npt thread dimensions in mm