10-24UNC is an American unified inch thread, the size is 10#, the thread diameter is 4.826mm, and the bottom hole diameter is 3.960mm, UNC represents the American coarse thread, 10-24UNC, and UNC 3A are only different in accuracy, but the basic dimensions are the same.
How do we differentiate between UNC and UNF threads?
1. Different thicknesses:
unc is a coarse thread, and unf is a fine thread.
2. Different pitches:
unc coarse thread M8, pitch P=1.25, unf fine thread M8, pitch P=1
3. Different labeling methods:
unc coarse thread series: 3/8-16UNC-2A, unf fine thread series: 3/8-24UNF-2A (thread diameter-number of threads per inch series code-precision grade).
Extended information:
1. UN thread is a threaded standard based on imperial dimensions jointly formulated by the United States, Britain, and Canada. It is called a unified thread and is commonly called an American thread.
2. American thread: coarse thread series UNC, fine thread series UNF, extra fine thread series UNEF, fixed pitch series UN.
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