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Hole Types and Thread Patterns for Bolts and Screws

Learn about straight cylinder counterbores, countersinks, threaded holes, hole feature placement, various thread series, major diameters, pitch depths, and thread annotations in the context of designing and working with bolts and screws.

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Hole Types and Thread Patterns for Bolts and Screws

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  1. Holes 3 Basic Types Drilled - Straight Cylinder Counterbore - Two cylinders, one on top of the other. Used to receive a bolt head. Countersink - A cone on top of a cylinder. Used to accept a flat head bolt/screw.

  2. Hole Types Hole Counterbore - receives a bolt head Countersink - receives a flat head screw or bolt

  3. Hole Feature Placement • A hole feature requires a hole center point sketched on an existing feature. You can also select endpoints or center points on existing geometry as hole centers.

  4. Threaded Holes • Threads can be added to holes for bolts or screws. There are several types of threads series. Each is identified by their: • Major Diameter • Threads Per Inch • Thread Series Identification • Ex. 9/16 - 12 UNC • This represents a thread with a major diameter of 9/16”, 12 threads per inch and is a standard Unified National Course thread.

  5. Thread Patterns • UNF - Unified National File • UNC - Unified National Course • UNS - Unified National Special • UNEF - Unified National Extra Fine • ISO - International Standards • UN - American National (External Thread) • UNR - American National (Internal Thread)

  6. Pitch Depth Rounded Root Unified National Thread Form

  7. Pitch Depth Flat Root American National Thread Very similar to Unified National Threads but has a Flat Root.

  8. Pitch Depth Flat Root Metric Thread Forms - ISO

  9. Unified And American Threads .5 - 13 UNC - 2A _ .75 Blank=Right hand, LH=Left Hand A=External, B=Internal • Class of Fit • 1=large tolerance , 2=General purpose, 3=low tolerance Thread Series - UNF, UNC, UN, UNR # of Threads per Inch Major Diameter Thread Annotations Thread Depth - Internal

  10. Thread Annotations ISO Thread Forms M12 X 1.5--6H • # Between 3 & 9 identifies grade of tolerance • 3 - 5 Fine, 6 is most common, 7-9 Course • Letter Denotes Thread Tolerance H=low, G=tight • H or G for Internal, g or h for External Thread Pitch in millimeters followed by a dash X means by Nominal Major Diameter in millimeters Designates Metric

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