Holes 3 Basic Types3 Basic Types
DrilledDrilled - Straight Cylinder - Straight Cylinder
CounterboreCounterbore - Two - Two cylinders, one on top of cylinders, one on top of the other. Used to receive the other. Used to receive a bolt head.a bolt head.
CountersinkCountersink - A cone on - A cone on top of a cylinder. Used to top of a cylinder. Used to accept a flat head accept a flat head bolt/screw.bolt/screw.
Hole Types
HoleHole
Counterbore - receives a bolt Counterbore - receives a bolt headhead
Countersink - receives a flat Countersink - receives a flat head screw or bolthead screw or bolt
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.
Threaded HolesThreads can be added to holes for bolts or screws. Threads can be added to holes for bolts or screws. There are several types of threads series. Each is There are several types of threads series. Each is identified by their:identified by their:
•Major DiameterMajor Diameter
•Threads Per InchThreads Per Inch
•Thread Series IdentificationThread Series Identification
Ex. 9/16 - 12 UNCEx. 9/16 - 12 UNC
This represents a thread with a major diameter of 9/16”, This represents a thread with a major diameter of 9/16”, 12 threads per inch and is a standard 12 threads per inch and is a standard UUnified nified NNational ational CCourse thread.ourse thread.
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)
Unified National Thread Form
DepthDepth
Rounded RootRounded Root
PitchPitch
American National Thread
DepthDepth
PitchPitch
Flat RootFlat Root
Very similar to Unified National Threads but has a Flat Root.Very similar to Unified National Threads but has a Flat Root.
Metric Thread Forms - ISO
DepthDepth
PitchPitch
Flat RootFlat Root
Thread Annotations
Thread Depth - InternalThread Depth - Internal
Unified And American ThreadsUnified And American Threads
.5 - 13 UNC - 2A _ .75.5 - 13 UNC - 2A _ .75
Major DiameterMajor Diameter
# of Threads per Inch# of Threads per Inch
Thread Series - UNF, UNC, UN, UNRThread Series - UNF, UNC, UN, UNR
Class of Fit Class of Fit •1=large tolerance , 2=General purpose, 3=low tolerance1=large tolerance , 2=General purpose, 3=low tolerance
A=External, B=InternalA=External, B=InternalBlank=Right hand, LH=Left HandBlank=Right hand, LH=Left Hand
Thread AnnotationsISO Thread FormsISO Thread Forms
M12 X 1.5--6HM12 X 1.5--6H
Designates Metric Designates Metric
Nominal Major Diameter in millimetersNominal Major Diameter in millimeters
X means byX means byThread Pitch in millimeters followed by a dashThread Pitch in millimeters followed by a dash
# Between 3 & 9 identifies grade of tolerance# Between 3 & 9 identifies grade of tolerance•3 - 5 Fine, 6 is most common, 7-9 Course3 - 5 Fine, 6 is most common, 7-9 Course•Letter Denotes Thread Tolerance H=low, G=tightLetter Denotes Thread Tolerance H=low, G=tight
•H or G for Internal, g or h for ExternalH or G for Internal, g or h for External
