Unified Fine Thread

UNC and UNF are symbols of Unified Screw Thread Series

The Unified Thread Series was agreed on by the United States, Great Britain and Canada in 1949 to obtain interchangeability.  Recently, modifications have been made to the original 1949 specifications for ease of use.
The Unified Thread Series is classified into coarse threads, fine threads and extra fine threads much like Metric screw threads are.
UNC: Is the symbol for Unified coarse pitch threads.
UNF: Is the symbol for Unified fine pitch threads.

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F065
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F067B
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F201
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F202
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F202L
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F203
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F203L
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gms
F204
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gms
F204L
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gms
F204T
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gms
F205
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gms
F205L
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gms
F206
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gms
F206L
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gms
F206S
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gms
F207
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gms
F207L
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gms
F208L
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gms
F208S
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gms
F208T
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nut - nyloc
gms
F209L
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gms
F209S
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gms
F209T
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F377
gms
F377
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