Nuts

British Association screw threads, or BA screw threads, are a largely obsolete set of small screw threads, the largest being 0BA at 6 mm diameter. They were used by Lucas in many of the instruments and also found in the MG early models in handles, windscreens and many of the chrome items.

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.

F061L
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Cage + Nut 1/4 UNF

F065
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Cage For Nut (Zinc) All Size

F067
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Nut and cage 5/16 UNF

F067B
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Nut and cage 3/8 UNF

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F198
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F200
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Nut 1/8 UNF

F201
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F202
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Nut 3/16 UNF Self Locking

F202L
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F203
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F204
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F204L
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F204T
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F205
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F205L
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F206
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Nut 7/16 UNF Self Locking

F206L
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Nut 7/16 Slotted UNF

F206S
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F207
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F207L
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Nut 9/16 UNF Self Locking

F208L
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Slotted Nut 9/16 UNF

F208S
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Thin Nut 9/16 UNF

F208T
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Nut 5/8 UNF Self Locking

F209L
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Slotted Nut 5/8 UNF

F209S
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F209T
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Plain Nut-4 mm

F304
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Plain Nut-5 mm

F305
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Plain Nut-6 mm

F306
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aaa_photo

Plain Nut-8 mm

F308
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Plain Nut-10mm

F310
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W155N
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W336N
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