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Comprehensive Guide to Dimensioning Standards: Angles, Arcs, Circles, and Threads

This resource provides detailed information on dimensioning standards for angles, arcs, circles, and threaded features. Learn the angular method for dimensioning angles, including how to dimension arcs and curved features with proper leader markings for radius and diameter. Understand hole notes, including depth and counterbore specifications. Get insights into Unified National Thread notes, specifying thread types, pitches, and tolerances. Familiarize yourself with standards from ANSI and ISO to ensure accurate and industry-compliant engineering practices.

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Comprehensive Guide to Dimensioning Standards: Angles, Arcs, Circles, and Threads

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  1. Dimensioning Standards Part 2

  2. Dimensioning Angles • Angular method • One location distance and the angle. Coordinate Method Two location distances of the angle.

  3. Arcs and Curved Features • Dimensioned in views that show the arc • Leader identifies radius • May include center mark Capital “R” for radius Small arcs do not need center marks. Arrow can be outside. Large Arcs use Center marks

  4. Circles • Have a center mark • Leader identifies diameter • Holes have “Hole Notes”  = diameter Hole Note: This hole has .5” diameter and is 1.00” deep

  5. Reading Hole Notes Hole Depth is .75” Diameter is 0.25” Counterbore Diameter of Counterbore is 0.38” Depth of Counterbore is 0.25” OR Hole extends through block or material Diameter is 0.38”

  6. Unified National Thread Note Threads per Inch (TPI) Major Diameter C = coarse F = fine

  7. Reading a ISO Thread Notes Prior to THRU, LH for left hand thread. THRU or a depth may be specified Pitch of the threads Grade of thread tolerance from fine to coarse (3,4,5,6,7,8 or 9) G = tight allowance H = no allowance. M for Metric Nominal Diameter In Millimeters

  8. Standards Institutions • ANSI - American National Standards Institute • This institute creates the engineering standards for North America. • ISO - International Organization for Standardization • This is a world wide organization that creates engineering standards with approximately 100 participating countries.

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