The root is the top surface joining the two sides of a thread.

More Questions from Threads, Fasteners and Springs

• Thread length, finish, and proportions are some of the standard characteristics of bolts and nuts.
• Doubled threads are composed of two or more ridges running side by side.
• The form of a thread is the cross section of the thread cut by a plane containing the axis.
• Pitch is equal to 12 divided by the number of threads per inch.
• Multiple threads are composed of one ridge, and the lead is equal to the pitch.
• Rivets are not considered permanent fasteners.
• An internal thread is a thread on the outside of a member.
• The major diameter is the largest diameter of a screw thread.

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