Screw Thread Series Index

Threads on fasteners

inch-based in current use
- 8UN
- 12UN
- 16UN
- UNC (The commonest series in the United States; what you’ll find in the hardware store.)
- UNC (formatted for mobile devices)
- UNF
- UNF (formatted for mobile devices)
- UNEF
- UNJ
- UNR
inch-based, obsolete
- 8N
- 12N
- 16N
- A.L.A.M.
- BSC (British Standard Cycle)
- BSF (British Standard Fine)
- BSW (British Standard Whitworth
- Cadillac
- CEI (Cycle Engineer's Institute)
- NC (National Coarse)
- NF (National Fine)
- SB (Manufacturers' Stove Bolt)
- V-thread
meter-based in current use
- UNM (Unified Miniature)
- ISO
meter-based, obsolete
- BA (British Association)
- Bourgeaux
- Elgin (proprietary screws at a major watch manufacturer)
- Latard
- Löwenherz
- Progress
- SF (French Standard Thread, and French Metric Thread)
- Thury
- Waltham (proprietary screws at a major watch manufacturer)

See bolts for other characteristics of threaded fasteners, such as strength grades.

Thread systems not related to fasteners

See pipes for the threads on pipes.

See bottles for the threads on bottle caps.

See light bulbs for the threads on the bases of incandescent light bulbs.

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Last revised: 12 January 2015.