BSPTRc 1/8 : Brith Pipe (BSP) Thread Dimensions and Tolerances. All the relevant data for this tread in one spot. Dryseal Pipe Threads (NPTF) British Pipe Threads (BSP) ACME Trapezoidal Threads; Minimum length of useful threads (L min) 4.5 : 0.1772 : Tap Drill Size (T d) 8.4 : 0.3307 : Browse Ads-Free For Just 1.5$ / Month. Login MIBRO1/4" 18 NPT Pipe Tap - Titanium Coated. 0 Reviews. Item: #1142-622. Product Overview Description. For cutting internal threads; Standard, pipe and metric sizes; Produced to exacting specifications; Tough, carbon tool steel for long life; Resist rust and tarnish; Cut cleaner, more accurate threads; 1/4-18NPT; Use drill size: 7/16 Diameter The diameters are given in inch fractions. For example, 1/4″, 3/4″, 1 1/4″. It is also allowed to denote the diameters with a decimal value. For example, 0.250 (1/4″), 0.4375 TapDrill Sizes for 1/4 - 32 UNEF. If not specified, assume a thread depth of 75%. You can learn more about thread depth in tapping here. To get the tap drill size in other depths, use our Tap Drill Size Calculator . Thread Depth. Tap ThreadMills. Pre Tap Drill Size Pipe Tap NPT & NPTF. Tap. Drill Size. Decimal Equivalent. 2 - 11-1/2. 2in 3/16. 2.1875. 1-1/2 - 11-1/2. 1 - 11-1/2. 1in 9/64. 1.1406. 3/4 - 14. 29/32. 0.9062. 1/2 - 14. 45/64. 0.7031. 3/8 - 18. 9/16. 0.5625. 1/4 - 18. 7/16. 0.4375. 1/8 - 27. Q.332. 1/16 - 27. C.242. Inch Cutting Tap. Metric Cutting Tap. Inch The1/16”, 1/8”, 1/4”, and 3/8” sizes have a dissimilar pitch, which causes a misalignment of the threads. The flank angles of the threads are also different between NPT and BSP. NPT has a 60° thread where the BSP has a 55° thread. Figure 5 shows a male NPT thread tightened into a BSPP. Z2nh. 1 NPT refers to nominal inside pipe size. I don't have my tap chart handy, so I'll use an example, A fitting of ~1" ID and 1/8" wall would be 1-1/4" OD. If this were a straight thread, minor dia. would be 1.156" and Major dia would be a hair over 1-1/4. Then consider that this is a tapered pipe thread.. 1- 32 32-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 1 - 32 32-UN. If not specified, assume a thread depth of 75%. HelicalInsert Specs: Internal Thread Size: 1/4-18 NPT. Length: 0.394". Material: 18-8 (304) Stainless Steel. Type: Free Running. Tap Size: 1/4-18 NPT STI. Drill Size: 33/64" (not included in kit, sold separately) Quickly and easily repair stripped or damaged threads, or create stronger original threads in die castings or plastics with our BritishPipe Thread ( Whitworth Form) -- Taper (BSPT) Thread Designation BSPT: Nominal Size BSPT: Thread Form Type: Major Diameter mm Minimumlength. of useful threads (L min) 6.7. 0.2638. Tap Drill Size (T d) 11.2. 0.4409. BSPT Rc 1/4 : Brith Pipe (BSP) Thread Dimensions and Tolerances. All the relevant data for this tread in one spot. 1¼” NPT taps need a 1 1/2 inches size drill bit and can be used for re-threading damaged pipe threads. They’re mostly used for tapping fittings and couplings much like the 1/8″

1 4 npt thread drill size