Thread Forms & Types
This thread type has a flat top and bottom and is used for power transmission.
What is a square thread?
This fastener works with a bolt to clamp parts together.
What is a nut?
This term describes a thread shape that narrows toward one end.
What is tapered?
This measurement system is used in most of the world for screw threads.
What is metric?
This cylindrical rod is used to align or fasten components.
What is a pin?
This trapezoidal thread form is commonly found in vises and lead screws.
What is an ACME thread?
This fastener has external threads and is commonly used with a nut.
What is a bolt?
The distance from one thread to the next, measured along the axis.
What is pitch?
This standard thread form is coarse and commonly used in North America.
What is Unified National Course (UNC)?
This term describes a property used to classify or define a fastener.
What is an attribute?
This theoretical thread form has pointed crests and roots.
What is a sharp “V” thread?
This permanent fastener is often hammered into place and used in sheet metal.
What is a rivet?
This measures how far a screw thread advances in one rotation.
What is lead?
This thread representation uses simple lines in technical drawings.
What is simplified thread representation?
This groove is cut into a shaft to hold a key in place.
What is a keyseat?
This thread form resists high forces in one direction, often used in jacks or presses.
What is a buttress thread?
This small screw holds components in place by pressing against a shaft.
What is a setscrew?
The largest diameter of a screw thread.
What is the major diameter?
This term defines the allowable variation in thread size or form.
What is tolerance?
This slot is cut into a hub to receive a key for torque transmission.
What is a keyway?
This older British thread form is rarely used today but was standard in the UK.
What is a Whitworth thread?
These fasteners have coarse threads and are designed to grip wood.
What are wood screws?
This value tells how many threads appear in one inch of a threaded part.
What is threads per inch (TPI)?
This drawing representation includes a realistic view of the threads.
What is detailed thread representation?
This is a collection of CAD icons used to represent common parts.
What is a symbol library?