Recoilscrew threads inserts are used to produce new threads or can be used to repair threaded holes which have been damaged or stripped and refurnish them to their original thread size. The Recoil insert, which is larger in diameter than the tapped hole is compressed during installation then allowed go spring back, permanently anchoring the 48 NPT : Pipe and Fitting Thread Dimensions and Tolerances. All the relevant data for this tread in one spot. 4-8 NPT : Pipe and Fitting Thread Dimensions and Tolerances. (E 3) 4.31875: 109.696: Tap Drill Size (T) N/A: N/A: 4-8 NPT - Internal (Fitting) Drawing. Overview Drawing. Profile Drawing. 4-8 NPT - Tolerances. Property Minimum Maximum; Forexample ¼ NPT thread Drill size is 7/16” but how long is deep? Thread Size is ¼ with 18 TPI but what is the total depth of the thread? My understanding for example ¼ NPT will include NPT total depth = Hand Tight Threads + Wrench Tight Thread = 0.2278 + 0.1667 = 0.3945 If total depth = 0.3945 Drill 7/16” depth can be 0.6945” for Designationof Dryseal Pipe Threads: The standard Dryseal pipe threads are designated by specifying in sequence nominal size, thread series symbol, and class: Examples:1⁄8-27 NPTF-1; 1⁄8-27 PTF-SAE SHORT; and 3⁄8-18 NPTF-1 AFTER PLATING. Table 8. Suggested Tap Drill Sizes for Internal Dryseal Pipe Threads DrillSize mm in mm in M1.6 0.35 1.25 3/64 - - - M1.8 0.35 1.45 0.059 (#53) - - - NPT & NPTF NPS & NPSF Pipe Tap Size Pitch (TPI) Drill Size* (inch) Pitch (TPI) Drill Size (inch) 1/16 27 0.242 (C) - - Drill Ø = Thread Ø - (1.229 x Pitch x 0.75) For UN, 38 - 16 16-UN : Basic Thread Dimensions (Pitch, minor & major diameters, depth, lead), Tolerance range for all applicable classes and much more Dryseal Pipe Threads (NPTF) British Pipe Threads (BSP) ACME Trapezoidal Threads; Materials Menu Toggle. Tap Drill Sizes for 3/8 - 16 16-UN. If not specified, assume a thread depth of 75%. 18-27 NPT : Pipe and Fitting Thread Dimensions and Tolerances. All the relevant data for this tread in one spot. water well drilling opinions needed. don4140; Oct 2, 2022; General; 3 4 5. Replies 84 Views 4K. Today at 6:35 AM. DDoug. D. Share: Facebook Twitter Reddit Pinterest Tumblr WhatsApp Email Share Link Thethread tapers 3/4 of an inch per foot. All Pipe Taps furnished with a 2-1/2 to 3-1/2 thread chamfer. NPT threads require the use of a sealer like Teflon tape or pipe compound. Carbon steel pipe taps are designed to clean and or re-thread damaged or jam pipe threads. Uncoated tools feature just the base substrate without any additional NominalSize BSPT Thread Form Type Major Diameter mm d=D Pitch mm p Threads per inch tpi Pitch Diameter mm d2=D2 Minor Diameter Male Thd. d3=D3 Thread Height H1 Rounding r Effective Thread Length mm External Tap Drill Diameter mm; R 1/16: 1/16" BSPT: 7.723: 0.907: 28: 7.142: 6.561: 0.581: 0.125: 2.5: BSW BSF BSPP BSPF BSPT Ex 3/8 - 18 NPT - For additional dimensions, see NPT Pipe Thread Calculator. Supplements: Thread calculators and charts Reference: ANSI/ASME B1.20.1 - 1983 H7a7RTx.