1 4 npt drill size. 242) 1/8 - 27 "Q" (0.

272” – . The NPT - National Pipe Taper Threads - is based on the Briggs Standard Pipe Thread. NPT taps are commonly called pipe taps by most people. Each thread size has a defined number of threads per inch - TPI, or pitch. National Pipe Thread tap drill size Popup chart. Wrench makeup turns. To calculate the NPT drill size, you need to know the pitch and Major Diameter (MajD) of the thread. Drill sizes for Briggs Standard Pipe taps for direct tapping without reaming are indicated below: Some common 1/4 NPT hole saw sizes include: 17/32 inch; 9/16 inch; 1/2 inch; Refer to the hole saw's labeling to identify which size matches your desired 1/4 NPT clearance hole. Three NPT thread hole making strategies: 1 - Drilling. 5. 50 3 0. Line: CDT. (Decimal) Number Drill. 338 inches. Have a 1/4" NPT grease fitting that needed a tap for. Taps wth BSPP threads have a bottoming chamfer that cut into the workpiece with just 1-2 chamfered threads. The wire gauge and letter systems refer to tool diameters that increase as the wire gauge decreases from #107 to #1 and then continues from A to Z. 10. 25 INCH, P=0. 401 7/16 3/8” 0. (Fraction) Tap Drill Dia. Century Drill & Tool Standard Pipe Tap - 97207. Bolt or The nominal size of a Pipe Tap is that of the pipe fitting to be tapped, not the actual size of the tap. Unlike a tap, a thread mill has a smaller diameter than the thread size being produced because the mill must be able to enter into the drilled hole and interpolate. M10 x 0. Sep 28, 2016 · About National Pipe Taper (NPT) Taps . All Pipe Taps furnished with a 2-1/2 to 3-1/2 thread chamfer. 9/64". Feb 1, 2021 · In our case, the correct tap drill would be the closest to 3. Drill diameter. Pipe Tap NPT & NPTF. Ø D1. Dimensions are shown for both plug and bottoming taps. Drill size w/out. Set with Fabric Pouch. Using Precise 1/4 NPT Drill Sizes. 196 (#9) 19 29/64 19 7/16 5/16 18 1/4 - - - - 3/8 16 5/16 19 19/32 19 37/64 7/16 14 23/64 - - - - The nominal size of a Pipe Tap is that of the pipe fitting to be tapped, not the actual size of the tap. Tap drill size for 1/2 pipe is . 4375 inches in decimals. Nominal Pipe Size (Ø) 1/4". It is also called Dryseal Pipe Thread. 9. 240 4. 254 mm) 4/0. Tap Drill (mm) M4 x 0. 703 so right on 3/4 would be . 1/16″ NPT. /ft. The nominal size of a Pipe Tap is that of the pipe fitting to be tapped, not the actual size of the tap. 7031: 45/64. Feb 20, 2015 · 2. NPT Threads Tap Drill Charts | British Standard Pipe Threads BSW BSPP BSPT Pipe Tap Size Pitch (TPI) Drill Size (inch) Pitch (TPI) Drill Size (inch) Pitch (TPI) Drill Size* (inch) 1/16 60 0. 5781: 37/64. 20. MaxTool 1/4"-18 NPT Tap (National Pipe Taper Tap) 18 TPI; Quality High Speed Steel HSS M2; Fully Ground; NP02W00R016. Threads Per Inch (TPI): This tells you how many threads are in one inch of the pipe. Pipe Outside Diameter (D) Pair with bolts or threaded rod to lift and hang components. ANSI B 1. 036 INCH, L=0. American Taper Pipe Thread, with sealant compound. 1875. NPTF stands for National Pipe Thread Fuel, based on ASTM B1. 37/64: 3/8 – 18 NPT. Nominal size (inside diameter) Actual OD. 4-1/4". 72525. 3/8 NPT - drill with a 37/64 bit to a minimum depth of 0. - NPT Thread taper angle = 1/16 taper = 1 deg. Tapered pipe threads are commonly used on pipe ends Mar 9, 2023 · Versatility Redefined: Comprising 5 pieces, the set has the universal sizes; 1/8" - 27 NPT, 1/4" - 18 NPT, 3/8" - 18 NPT, 1/2" - 14 NPT, 3/4" - 14 NPT. 1/8-27 NPT ; 1/4-18 NPT ; 2 Results Found Tap National Pipe Thread 1/8-27 NPT Drill Bit 21/64″ Combo Pack (93201) View Product. Tap National Pipe 1-27/64. Coarse 0. 242) 1/8 - 27 "Q" (0. Only 2 left in stock - order soon. 3438 *NpT DECIMAL EQUIV. 200 4 3 0. National Pipe Threads Tap Drill Chart. May 26, 2023 · How Do You Calculate Npt Drill Size? NPT drill size refers to the National Pipe Thread taper. Ordered 1/4-18 NPT which I discovered is a totally different size (much bigger). 1/4 NPT - drill with a 7/16 bit to a minimum depth of 0. The inch-based standard is widely used in the US. 1-3/4-12. 3/4″ conduit, drill using a 1 1/8″ or 29mm hole saw. For interpertations of the terms scroll down to the drawings below the table. 2"-12. designation. 59/64" drill bit has 1/2" shank. In conclusion, while the recommended drill bit size for a 1/2 inch NPT is a 23/32 inch, there are alternative sizes that can be used effectively. 563 8 3/4-16 0. Jun 10, 2023 · Right size drill for 1/8″ NPT: The appropriate drill bit size for a 1/8″ NPT pipe tap is designated as an R type, which corresponds to 0. NPT threads require the use of a sealer like Teflon tape or pipe compound. pipe reamer. Another common drill bit size for a 1/8 NPT tap is size #2. If the pipe tap is tapered, the ideal drill size is 21/64mm in fraction form or 0. Drill Size: 1/8" NPS Tap "S" Drill Bit: 1/4" NPS Tap: 29/64" Drill Bit: 3/8" NPS Tap: 19/32" Drill Bit: NPT Tap Drill Chart; NPS Tap Drill Chart; Screw Machine Pipe sizes do not refer to any physical dimensions. 5. [inches (mm)] 5/0. 75. thread chamfer. Sep 9, 2018 · They are commonly used to drill lathe centres and spotting drills, i. 010 in (0. Set with Wood Case. 875mm. Kept it as just not worth the hassle of returning. 8 Jan 6, 2024 · Drill bit size #1 is commonly used with a 1/8 NPT tap. The thread tapers 3/4 of an inch per foot. NPT Tap and Drill Set comes in an easy to maintain plastic pouch; Set contains one Carbon Steel NPT Pipe Tap and the matching size Black Oxide High Speed Steel Drill Bit; Carbon steel NPT pipe taps are designed to clean and or re-thread damaged 1 1/4-11. 0000000. We call this the “12 thread count”. 3 days ago · 4. S. 2 - 11-1/2. 2 - Helical Interpolation. Letter Drill. Screws and Bolt Size Bolt Screw Size to be Removed. 4375 0. The outside diameter of a pipe or fitting must be measured and compared to a table for size identification. Nearest . 5625 TAP DRILL 1/4 11/32 7/16 37/64 23/32 59/64 1 5/32 May 14, 2019 · Most standard pipe taps have a maximum chamfer length that ranges between 3 and 4 threads. Drill Bit Size #2. NPT threads require the use of a “sealer” like teflon tape or pipe compound. 78125 & tap to a depth of 0. 1. Sheet Metal Gauge (Steel) Thread Size. In stock and ready to ship. [4] The taper rate for all NPT threads is 1 inch of diameter in 16 inches of length ( 3 ⁄ 4 inch per foot or 62. 7/16: 1/4 – 18 NPT. The drill size chart contains tools up to 1. 1/4"-18 NPT Carbon Steel Pipe Tap. 60. 3320 Metric thread to DIN 13 part 6 and 7 (for screw connections to DIN 89 280) Nominal size. HOLE SAW SIZES AND KNOCKOUT PUNCH EQUIVALENT. It is used for the repair of rusted, broken and slippery threads of water pipe water joints. The NPT taper is a tapered thread that allows for a tight seal between two pipes or fittings. threads. 2 products. mm. Advertising: Nominal Diameter. Bought wrong size. Inch. Tap Drill Size (Decimal Inch): This is the size of the drill bit you need, measured in decimal inches. 050 inches. 750. Countersinking the drilled hole to prevent a feather edge at the start of the tapped hole. Because manufacturers produce 1/4-18 NPT taps to a standard size, the starter hole drill bit size is uniform across all tap makes and models. However, they differ in their design: NPT threads are tapered, while NPS threads are straight (parallel). Compare. 13/16. 1/2″ conduit, drill using a 7/8″ or 22mm hole saw. For our 1/8 NPT tap in focus, a 21/64-inch drill bit is recommended. 5 inches in decimals. 281” – . 1 / 4 " 1 7 / 6 4 " 1 9 / 6 4 " 5 / 1 6 " 1 1 / 3 2 " 3 / 8 The extractors in this set are matched with the right drill bit sizes as well as bushings to help you Jan 3, 2024 · Clean any debris from the hole. NPT taps are also called pipe taps and don’t confuse them with NPTF taps and tapered taps like the 5/8-11 tap. 3. Create pipe and conduit threads in a range of hole diameters. Companies like Guhring actually recommend 60% NPT American Taper Pipe Thread. Most tap drill charts call out only one tap drill size, and that will produce an approximate 75 percent thread. 046 (#56) 28 0 Drill America POU Series 1/8" NPT Tap and Drill Set, 1/8" Carbon Steel NPT Tap and"R" HSS Drill Bit in Plastic Case 4. Drill size chart for machining. Choose a Size. 9, Thread Class Limit: H2 (#6, 8, 10), H3 (#12 and above) CAUTION: Any cutting tool may break or shatter under improper use. With a square shank, these taps are compatible with tap wrenches and tap holders for drill presses and milling machines. A 1-¼” NPT Tap needs a drill bit size of 1 1/2 inches or 1. If you have a 1/8’’ NPT pipe tap, the R type is the appropriate drill bit to use with this tap. Decimal Equivalent. NPT threads require the use of a sealer Taps and drill sizes used for Whitworth - ISO 7 and ISO 228 threads. 275” 1/8-27 Clearance Hole Drill Chart. 2420 3-48 47 0. 339″ or approximately 8. Hole Ø D3. 375 4 7/16-20 0. Note b: Reference dimension. wwwsuttontoolscom Rc (BSPT)* ISO Rc TAPER SERIES 1:16 (55º) Tap Size TPI Drill Only* Drill & Reamer Rc 1/16 28 6. 2 10. All the relevant data for this tread in one spot Tap Drill Sizes Charts; LEARNING Menu Toggle. 3/8" Carbon Steel NPT Tap and 37/64" HSS Drill Bit in plastic pouch. . Tap Drill Dia. National Standard Taper Pipe Threads Size NPT Chart - Includes both External and internal Pipe Thread Data. This delivers 27 threads per inch. 75 in. Property. 12 threads total. Length of effective thread. standard for tapered threads on hollow pipes and fittings. marking holes to guide twist drilling. 246 0. 1/2″ conduit knockout punch is 0. 03125 & tap to a depth of 0. Nominal Pipe Size (Ø) 1 1/4". Pre Tap Drill Size. 1) 4: 3: 3 5/8 (93. Following these recommendations will only give you a full thread for the Feb 20, 2015 · Tap Drill Size Decimal inch Tap Drill Size Decimal inch Tap Drill Size mm Decimal inch Tap Drill Size mm Decimal inch; 1/16 - 28 : 28: 1/4: 0. Machinist Screw Thread Tap - Drill Size Table Chart ANSI Sizes | Drill Size Chart (UNC, UNF & Metric ISO Series) Whitworth BS Pipe Thread Size and Tap Drill Table Chart DIN/ISO 228. 332) 1/4 - 18: 7/16 Product is made in Japan and seems to be of high quality. Top Of Page. NPT threads require the use of a sealer 7/8-14. 3. 2 Rc 1/8 28 8. per foot. NPT Jarflo Taper Hole Size “T” Straight Hole Size “S” 1/16-27 . Major Diameter. 6mm. 3/4" Carbon Steel NPT Tap and 59/64" HSS Drill Bit in plastic pouch. $1975. 4 6. 75 x 0. Taps require a starter hole slightly smaller than the breadth of the tap's cutting edges. 339 inches or 8. G A ¼” NPT Tap needs a drill bit size of 7/16 inches or 0. 2500: F: 0. It is important to choose the right drill bit size to ensure a proper fit and prevent issues such as thread stripping or breakage. Recommended NPT, NPTF Screw Tap Drill Size Nominal w/o Reamer Size Drill Decimal Size Drill Decimal 2-56 50 0. 344’’. Flank Infeed method with contant volume. Clearance Hole Drill ChartThe chart below displays a variety of common screw sizes and their clea. 339’’. 2 7/32. 2. ANSI/ASME B1. 1/16. 1″-14. See Tap Drill Sizes for NPT Pipe Threads . Fraction. 261 (G) - - 1/8 40 0. Tap Drill (mm) Thread Size. 5 millimeters per meter) measured by the change of diameter (of the pipe thread) over distance of thread. Extractor Size. The ¼ NPT tap is commonly used for tapping pipe fittings and couplings much like the 1/8 Thread Mills. ) (Decimal) (in. To help you get the grasp of the fine-coarse difference, the M4 classification comprises of the:-. 0700 1/16-27 C 0. However, when drilling into harder materials such as steel or stainless steel, a 7/32″ drill bit may be used for a tighter connection. Manufacturing Process and Design. 500 6 9/16-18 0. 58 Bolt, Screw, or NPT Fitting Size. 25 0. The drill size chart below contains all commonly used centre drill bit sizes. 098 (#40) 28 11/32 28 21/64 1/4 20 0. 1 Year Limited Warranty. The way to read an NPT size is the nominal inside diameter and the number of threads per inch. Length of engagement (tightened by hand) Hand tight turns. 357 INCH) (APPLICATION - EXTERNAL TURNING, TOWARDS CHUCK, RH TOOL, RH THREAD) (FEED - 17 Apr 6, 2024 · The perfect drill size for a 1/4-20 tap is a #7 drill bit with a diameter of 13/64″. Thread milling provides excellent control of the thread’s major diameter because it can be controlled using the machine’s cutter compensation. 96025. The below sample Gcode is configured for: Fanuc Controller. D. - Thread Designation: The nominal pipe size, number of threads per inch and the thread series symbol in sequence. The angle of the taper is 3° 47′ 24″ (1 in 40). For example, for a 1/8" grease fitting (thread size 1/8-27 NPT), the tap drill size is 0. (inches) Threads per Inch (also called Pitch) Length of Engagement Hand Tight Hand Tight Turns Wrench Makeup Turns Length of Effective Thread Tap Drill Size (inches) 1/4” 0. Learn more about NPTF and the difference between NPTF and NPT. 1/16-27 NPT : Pipe and Fitting Thread Dimensions and Tolerances. For example, if we have a 1/4-18 NPT, that means it is a 1/4 inch inside diameter and 18 threads per inch. Don’t confuse them with NPTF taps and tapered taps like the 8-32 tap as they are used for different purposes. Dimensions in Inches except where stated E = Pitch diameter at hand-tight plane. ance hole recommendations. 405 inch in 'big' diameter. All Pipe Taps furnished with a 2-1/2 in. Therefore, the tapping depth should be the approx. Tap Drill Letter Size: Some drill bits are sized by letters instead of numbers. 3/4 - 1-1/2 pitch of insert "set down" to allow for maximum production tolerance. 3 mm or 0. 242 (C) - - Drill Size* (inch) 1/16 60 0. 540 18 0. Apr 29, 2024 · Thread Percentage and Tap Drill Charts. 408 37/64 The nominal size of a Pipe Tap is that of the pipe fitting to be tapped, not the actual size of the tap. 59/64. Lower percentages such as “75% of the thread depth” are also widely used and considered safe. The nominal size of a Pipe Tap is that of the pipe fitting to be tapped, not the actual size of the tap The thread tapers 3/4 of an inch per foot. 6 out of 5 stars 701 2 offers from $11. 25-11-1/2 Inch NPT. ) Decimal Equivalent (in. Thread Size. The "1/4" portion of "1/4-18 NPT" refers to pipe diameter and the "18" refers to the number of threads per inch. 56 inches : Country of Origin ‎India : Item model number ‎93202 : Size ‎1/4-18 NPT, 7/16 Inch : Color ‎steel : Material ‎High Speed Steel : Item Package Quantity ‎1 : Measurement System ‎Metric : Included Components Carbon steel pipe taps are designed to clean and or re-thread damaged or jammers pipe threads. 4375: 7/16. NPT and NPS threads share similarities in thread angle, shape and pitch (TPI – threads per inch). A 3/4" NPT pipe thread has an outside diameter - OD - of 1. Practice on similar material to see if it is too deep in taper. This type corresponds to approximately 0. 2in 3/16. With an understanding of the proper drill sizes for cutting or clearancing 1/4 NPT threaded holes, let's look at some applications. 58 Jan 3, 2024 · You can use a tap drill chart to find the appropriate size for your specific thread size. 4 mm from below, and that is the 3. 7565. NPT is defined by ANSI/ASME standard B1. 1/2 NPT - drill with a 45/64 bit to a minimum depth of 1. 5 NPT - Internal (Fitting) Basic Thread Dimensions. 3/4″ conduit knockout punch is 1. Find The Tap And Drill Size You Need With American Fasteners Size Chart. TAP DRILL SIZE CHART FOR NPT THREADS (National Pipe Threads) NPT Size: Tap Drill Size (in. M18 x 1. 5) Recommended clearance holes and drill tap sizes. 27. This page provided the thread dimensions of 1 1/4 - 11 1/2 NPTF. 115 Drill America POU Series 1/8" NPT Tap and Drill Set, 1/8" Carbon Steel NPT Tap and"R" HSS Drill Bit in Plastic Case 4. 3mm CNC Gcode Program for Turning of 1/4-18 NPT. Carbon steel pipe taps are designed to clean and or re-thread damaged or jammers pipe threads. It provides a suitable thread engagement and creates the right-sized hole for the tap. SAE and NPT Pipe and Port Sizes SAE Dash Size Thread Decimal 2 5/16-24 0. 1-59/64. 5 threads for the “hand tight”, 3 threads for “wrench tight”, and 4 threads for the chamfer, or approx. to 3-1/2 in. Step 3: Considering Material Thickness. 9375. 4 8. Easily cut internal threads in pipes. External RH Thread. Assuming you have a machine which can handle the torque required of a drill the diameter needed for your NPT thread size, this is the quickest, and normally the most efficient option for creating your hole prior to threading. 047 too big. 13-inch tap drill. Pipe Tap Drill Sizes STRAIGHT DECIMAL EQUIV. 1-43/64. 9 ounces : Product Dimensions ‎5 x 1. Corresponding Drill Bit Size. s, Close Fit and Free Fit. 2570: 6. Apr 2, 2016 · I googled '1/2" npt drill size' and this was the second hit. 332 0. Right hand tool, machining towards the chuck. Both types feature a 60° included angle. Pipe Thread Tap and Drill Size Chart ANSI NPT. 1/4-18 NPT - Internal (Fitting) Basic Thread Dimensions. Mar 13, 2013 · Standard NPT Tap Drill Sizes. 750 Feb 4, 2024 · Drill bit sizes differ depending on the region—American, British, and Metric measurement standards exist. 1/8-27 NPT ; 1/4-18 NPT ; 3/8-18 NPT By signing up you agree to receive emails from CENTURY DRILL AND TOOL with news, special offers, NPT & NPTF NPS & NPSF Pipe Tap Size Pitch (TPI) Drill Size* (inch) Pitch (TPI) Drill Size (inch) 1/16 27 0. 023 on each side. National Standard Taper Pipe (NPT) Threads Size Chart. Table of screw bolt extractor sizes and pre-drill size required to use screw extractor easy-out. NPT threads require the use of a sealer like teflon tape or pipe compound. 046 (#56) 28 0. The following are the recommended tap drill sizes for internal dryseal pipe threads. (87. 000000. e. For most applications, you can get longer tap tool life and lower likelihood of breaking a tap off in the hole by using a lower percent of thread. 0. Designation of 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. A 19/32 inch or 5/8 inch drill bit can be used with good results, as well as metric sizes such as 15. Material: Carbon Steel. Understanding Thread Mills Jan 23, 2018 · ‎Century Drill & Tool : Part Number ‎93202 : Item Weight ‎1. 3/4"-14 NPT Carbon Steel Pipe Tap. Pipe thread sizes are usually based on the inside diameter (ID) or flow size. Pre-Drill Size. National Pipe Taper (NPT): NPT, or National Pipe Taper, is a U. % O0100 (MACHINING DOCTOR - THREADING CNC PROGRAM) (CONTROLER - FANUC A) (THREAD - ) (D=0. Each number or diameter of screw size has its own Close Fit or Free Fit, indep. 7/8-14. Size. Tap. The NPT refers to the pipe and fittings with tapered threads that follow National Pipe Thread specifications much like the 1/4″ NPT with a bit size “Tap Dill Size” is the drill diameter we should use before a tapping operation. /ft . Threads per inch. The table provides two different class of fi. For non-tapered or straight pipe tap, use a drill size of 11/32mm or 0. Part #: 97207. NPT Pipe Size: This is the size of the pipe you're working with. Drill size w/ taper. 675 18 0. To Tap For This Size . 3/16" - 5/16", 5 mm - 8 mm, No. 15/64. 1/16 inch or 1 • Spiral Point - Applied to all sizes of PLUG taps to push cuttings ahead of the tap • Precision Ground Threads - ASME B94. Choose from our selection of 1 1/4 pipe size taps in a wide range of styles and sizes. 8125 & tap to a depth of 0. Filter by fractional, wire gauge, letter, and metric. The others screw into one of two standard-size threads on hole saws with threads. 0785 1/8-27 Q 0. 2188. NPT Size: Tap Drill Size (in. 1. Thread Size: 1. Drill Size Alum / Steel. 3 (NPT - National Pipe Tapered Thread) NPT size Actual Pipe O. Feb 5, 2009 · So, a 1/8 NPT thread is not 0. 1 31/64 ". 5mm. 2500. This size is often recommended for general purposes and is a good starting point when working with a 1/8 NPT tap. Standard. For plug Taps 5/16" or M8 and smaller. N ational P ipe T aper (1:16) The flank angle is 60°, the profile was originated by William Sellers. Straight pipe. Oct 26, 2019 · This standard is widely used all over North America. 125 inch in diameter but is based on the thread that would be on the end of a piece of 1/8 inch pipe and is thus about 0. 313 3 3/8-24 0. Taps with NPT and BSPT threads have a plug chamfer for start-to-finish thread tapping. 438 5 1/2-20 0. Here’s a handy comparative table for clarity: NPT Tap Size. 4844". 1/8 – 27 NPT. 8125. 284” . 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 distance. Ø D2. Center punch before drilling. FREE delivery Fri, Jul 12 on $35 of items shipped by Amazon. Choose from our selection of 1/4"-20 adapters in a wide range of styles and sizes. ) 1/16 - 27 "C" (0. Bit will probably drill bigger than . 18. 4 Rc 1/4 19 11. Pipe Size is the accepted industry designation and does not refer to either the inside or the outside diameter (ID or OD) of a pipe or a fitting. 47 min = 0. The 3/4" NPT pipe thread has 14 threads . Helicoil Drill Chart. 37/64" drill bit has 1/2" shank NPT Tap and Drill Set comes in an easy to maintain plastic pouch Set contains one Carbon Steel NPT Pipe Tap and the matching size Black Oxide High Apr 6, 2024 · The recommended drill bit size for a 1/8″ NPT tap is an R type drill bit. ) 1/16 – 27 “C” The below sample Gcode is configured for: You can configure all the above parameters and much more in our Thread Turning Gcode Generator. 7 mm thread. 5 inches in diameter, but larger tools are also commonly used. Choose a suitable tap: Once you know the tap drill size, you can select a tap that matches the thread size and pitch. It is a variation of the more popular NPT thread standard based on ASTM B1. - The angle between the sides of the thread is 60 deg. 35. Cutting conditions for steel. The thread tapers 3/4 of an in. 885″ or 22. By default, the size you will find on most charts is the diameter for 75% thread depth on a Cutting Tap. This size is recommended for 1/4″ 20 UNC tap threads, providing a precise fit for the screw or bolt. Here you will learn how to get the right drill diameter depending on the tap type and required thread height. taper pipe reamer. Drill Size. qt dg qv nz gj ig th lb oc pc