Unified Thread Size Charts The Unified Thread Standard UTS defines a standard thread form and series along with allowances tolerances and designations for screw threads commonly used in the United States and Canada It is the main standard for bolts
THREAD PORT DIMENSIONS NOMINALC F SIZE TUBE THREAD A B 015 D E 005 G H CODE SIZE SIZE MIN MIN – 000 MIN MAX – 000 MIN 177 1 – 2 1 8 5 16 24 062 390 074 468 062 358 672 12
Thread Plug Gages NOMINAL SIZE GO BASIC ALL CLASSES ALL SERIES UNIFIED PITCH DIAMETERS NOT GO X TOL GO NO GO – XLEADTOL X 177 HALFANGLETOL CL 2B CL 3B 0 80 UNF 0519 0542 0536 0002 0002 0 30 1 64 UNC 0629
2013 2 12 nbsp 0183 32 Thread Height H1 Tap Drill Diameter mm 1 16 quot BSW 1 587 0 423 60 1 315 1 050 0 270 1 15 3 32 quot BSW 2 381 0 529 48 2 041 1 703 0 338 1 90 1 8 quot BSW 3 175 0 635 40 2 768 2 362 0 406 2 50 5 32 quot BSW 3 969 0 793 32 3 459 2 952 0 507 3 20 3 16 quot BSW 4 762
1 1 2 12 2A 1 4981 1 4867 1 4440 1 4376 1 3989 1 58100 Internal Thread Dimensions for Unified UNF Screw Threads Diameter Threads Per Inch TPI Thread Fit Class Major Diameter Pitch Diameter Minor Diameter Stress Area Min Max Min Max Min in 178
National Standard Taper Pipe NPT Threads Size Chart 1 16 0 3125 27 0 16 0 2611 1 8 0 405 27 0 18 4 189 2 189 0 26 1 4 0 54 18 0 2 4 3 0 401 3 8 0 675 18 0 24 4 189 3 0 408 1 2 0 84 14 0 32 4 189 3 0 534 3 4 1 05 14 0 34 4 189 3 0 546 1 1 315 11 5 0 4 4 189 3 188 0 682 1 188 1
Specifically speaking at 1 16 1 8 1 4and 3 8 sizes pitch difference results in misalignment of the threads This misalignment might result in the threads to be fastened only partially However at 1 2 and 3 4 sizes NPT and BSP have the same pitch which will allow them to engage well
Thread Major Diameter Thread Per Inch Pitch Diameter Minor Diameter Male Thread Minor Diameter Thread 5 16 0 3125 18 0 2764 0 2464 0 2524 3 8 0 3750 16 0 3344 0 3005 0 3073 7 16 0 4375 14 0 3911 0 3525 0 3602 1 2 0 5000 13 0 4500 0 4084 0 4167
2021 2 2 nbsp 0183 32 Thread sizes are given in nominal sizes not in actual measurement For instance when a screw or bolt measures 5 9mm it is called a 6mm thread There are two common methods to write the thread dimensions 1 Thread sizes in inches are specified by diameter
ASME B1 1 Section 8 3 In the table above d nom is nominal diameter in inches and TPI is threads per inch Flat Washer Dimensions The following table of flat washer dimensions was adapted from ASME B18 21 1 Table 11 for Type A Plain Washers Type A washers come in 2 series Narrow and Wide Size
Tap size NF NC UNF UNC Threads per inch Basic major dia inches Basic effective dia inches Basic minor dia of ext threads inches Basic minor dia of int threads inches Drill size 0 80 UNF 80 0600 0519 0447 0465 3 64 1 64 UNC 64 0730 0629 0538 0561
1 3 16 12 1 5 16 12 1 5 8 12 1 7 8 12 2 1 2 12 PITCH DIAM 2854 2902 3479 3528 4050 4104 4765 4731 5264 5323 7094 7159 8286 8356 1 0084 1 0158 1 1334 1 1409 1 2584 1 2659
Compression Thread 5 16 24 3 8 24 7 16 20 1 2 20 9 16 18 3 4 16 1 1 1 1 12 15 16 12 15 16 12 17 8 12 2 189 12 Metric Thread 10 12 14 16 18 20 22 24 26 27 30 33 36 42 48 M 10x1 0 M 12x1 5 M 14x1 5 M 16x1 5 M 18x1 5 M 20x1 5 M 22x1 5 M
Machine Screws Thread Dimensions L L Major Dia Pitch Dia Minor Dia Axis of screw thread 2A External Threads for Machine Screws and SEMS ASME B 1 1 2002 Nominal Size Thread TPI Type Major Diameter Allowance
2013 2 12 nbsp 0183 32 Thread Height H1 Tap Drill Diameter mm 3 16 quot BSF 4 763 0 794 32 4 255 3 747 0 508 4 00 7 32 quot BSF 5 556 0 907 28 4 975 4 394 0 581 4 60 1 4 quot BSF 6 350 0 977 26 5 725 5 100 0 625 5 30 9 32 quot BSF 7 142 0 977 26
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
1 6535 42 00 M42 4 5 3 0 1 6600 42 16 1 1 4 quot 11 1 2 1 6875 42 86 1 11 16 quot 18 1 745 44 32 1 3 8 quot 11 1 750 44 45 1 3 4 quot 5 8 1 3 4 quot 5 7 1 7717 45 00 M45 4 5 3 0 1 875 47 62 1 7 8 quot 8 1 8820 47 80 1 1 2 quot 11 1 8898 48 00 M48 5 0 3 0
Material Pin Dimensions Box Dimensions Thread Tool Joint Name amp Nominal Size O D Make to Dia Pin Length Pin ID Pin Dia Base Box Length Box Max ID Taper Thread Inch Thread Form 2 3 8″ Reg 3 1 8″ 3″ 1″ 2 625″ 3 1 4″ 1 3 4″ 3″ 5 TAPER 2 7 8″ Reg
The design principles of ISO general purpose metric screw threads quot M quot series threads are defined in international standard ISO 68 1 Each thread is characterized by its major diameter and its pitch ISO metric threads consist of symmetric V shaped thread In the plane of the thread axis the flanks of the V have an angle of 60 176 to each other
Thread I D 1 8 2 5 16 24 5 16 17 64 3 16 3 3 8 24 3 8 21 64 1 4 4 7 16 20 7 16 25 64 5 16 5 1 2 20 1 2 29 64 3 8 6 9 16 18 9 16 1 2 1 2 8 3 4 16 3 4 11 16 5 8 10 7 8 14 7 8 13 16 3 4 12 1 1 16 12 1 1 16 31 32 1 16
3 36 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 Gas R amp G also refer to BSP Male Iron Pipe may be BSP or NPT
3 Chart No 3 British Association BA Threads British Association Threads Dimensions in Inches except where stated Thread Form Data Tapping Drill Clearance Drill Size O Diameter Core Pitch Depth Radius Effective Dia T P I Dec Met Frac
Thread Major Diameter Thread Per Inch Pitch Diameter Minor Diameter Male Thread Minor Diameter Thread No 12 0 2160 32 0 1957 0 1788 0 1822 1 4 0 2500 32 0 2297 0 2128 0 2162 5 16 0 3125 32 0 2922 0 2753 0 2787 3 8 0 3750 32 0 3547 0 3378 0
Choose from our selection of 1 3 16 quot 12 nuts in a wide range of styles and sizes In stock and ready to ship Use these nuts with a sleeve and fitting to provide a tight metal to metal seal on stainless steel tubing that is flared to 37 Nuts are 316 stainless steel for
Measured in Inches Size Primary Inch Basic Major Diameter Inch Basic Pitch Diameter Inch Minor Diameter inch Minor Dia Area sq inch Tensile Stress Area sq inch External Thread Internal Thread 3 8 0 375 0 3344 0 3005 0 3073 0 0678 0 0775 7 16 0
The following table defines recommended industry standard sizes for Internal ACME General Purpose Threads per American National Standard ASME ANSI B1 5 All dimensional data is given in inches Designation Size Decimal TPI Tol Class Minor Dia Pitch Dia Major Dia Tap Drill Min Max Min Max Min Max 1 4 16 ACME 0 25 16 2G 0 1875 0 1925 0 2188 0 2293 0 2600
External Thread Dimensions for Unified UNC Screw Threads Diameter Pitch TPI Thread Fit Class Major Diameter Pitch Diameter Minor Diameter Stress Area Max Min Max Min Max Min in 178 64 2A 0 0724 0 0686 0 0623 0 0603 0 0538 0 00263 No
75 Thread 50 Thread All Materials Close Fit Free Fit Dia Major Dia Drill Size Decimal Drill Size Decimal Drill Size Decimal 1 3 16 1 1875 18 1 1193 1 1 8 1 1250 1 9 64 1 1406 1 13 64 1 2031 1 7 32 1 2188 1 1 4 1 2500 7 1 0747 1 7 64 1 1094 1 5 32 18
1 3 8 1 3750 6 1 2667 1 1705 1 1946 1 3750 12 1 3209 1 2728 1 2848 1 3750 18 1 3389 1 3068 1 3149 1 1 2 1 5000 6 1 3917 1 2955 1 3196 1 5000 12 1 4459 1 3978 1 4098 1 5000 18 1 4639 1 4318 1 4399 1 3 4
2015 2 13 nbsp 0183 32 The thread series is generally relative to the outside diameter of the screw 20 threads per inch on a 1 4 quot diameter screw is considered coarse 1 4 20 UNC On a 3 4 quot diameter screw 20 threads per inch is considered extra fine 3 4 20 UNEF It also plays a role in determining the length of engagement UN standard series thread