Jam Nuts

As of: Friday, July 11, 2025

Standard Features

Coarse or fine thread
Zinc-plated mild steel or stainless steel

Jam nuts are thin nuts that are assembled with regular nuts to lock both nuts in place. The jam nut helps prevent loosening by providing extra resistance.

Jam Nut Thread Size

Thread Size	Part#
Mild Steel, Fine Thread
1/4-28 UNF	14639
3/8-24 UNF	14651
1/2-20 UNF	14664
3/4-16 UNF	14687
1-12 UNF	14702
1-14 UNF	14703
1 1/4-12 UNF	14708
1 1/2-12 UNF	14711

Thread Size	Part#
Mild Steel, Coarse Thread
1/4-20 UNC	14636
3/8-16 UNC	14649
1/2-13 UNC	14661
5/8-11 UNC	14676
3/4-10 UNC	14686
1-8 UNC	14701
1-1/4-7 UNC	14707

Thread Size	Part#
Stainless Steel, Fine Thread
1/4-28 UNF	14640
1/2-20 UNF	14665
3/4-16 UNF	14688

Thread Size	Part#
Stainless Steel, Coarse Thread
3/8-16 UNC	14653
1/2-13 UNC	14662
5/8-11 UNC	14680
3/4-10 UNC	14690

Parts

Part #	Description
Mild Steel, Fine Thread
14639	Nut,Jam 1/4-28NF HEX Steel Zinc Plated Width Across Flats=7/16 Thickness=5/32
14651	Nut,Jam 3/8-24NF HEX Steel Zinc Plated Width Across Flats=9/16 Thickness=7/32
14664	Nut,Jam 1/2-20NF HEX Steel Zinc Plated Width Across Flats=3/4 Thickness=5/16
14687	Nut,Jam 3/4-16NF HEX Steel Zinc Plated Width Across Flats=1-1/8 Thickness=27/64
14702	Nut,Jam 1-12NF HEX Steel Width Across Flats=1-1/2 Thickness=35/64 Clear Zinc Plated
14703	Nut,Jam 1-14UNS HEX Steel Zinc Plated Width Across Flats=1-1/2 Thickness=35/64
14708	Nut,Jam 1-1/4-12NF HEX Steel Zinc Plated Width Across Flats=1-7/8 Thickness=23/32
14711	Nut,Jam 1-1/2-12NF HEX Steel Zinc Plated Width Across Flats=2-1/4 Thickness=27/32
Mild Steel, Coarse Thread
14636	Nut,Jam 1/4-20NC HEX Steel Zinc Plated Width Across Flats=7/16 Thickness=5/32
14649	Nut,Jam 3/8-16NC HEX Steel Zinc Plated Width Across Flats=9/16 Thickness=7/32
14661	Nut, Jam, 1/2-13NC, Hex, Width Across Flats = 3/4, Thickness = 5/16, Steel Grade A, Zinc Plated
14676	Nut,Jam 5/8-11NC HEX Steel Clear Zinc Plated Width Across Flats=15/16 Thickness=3/8
14686	Nut,Jam 3/4-10NC HEX Steel Zinc Plated Width Across Flats=1-1/8 Thickness=27/64
14701	Nut,Jam 1-8NC HEX Steel Zinc Plated Width Across Flats=1-1/2 Thickness=35/64
14707	Nut,Jam 1-1/4-7NC HEX Steel Zinc Plated Width Across Flats=1-7/8 Thickness=23/32
Stainless Steel, Fine Thread
14640	Nut,Jam 1/4-28NF HEX SST Width Across Flats=7/16 Thickness=5/32
14665	Nut,Jam 1/2-20NF HEX 18-8 SST Width Across Flats=3/4 Thickness=5/16
14688	Nut,Jam 3/4-16NF HEX SST Width Across Flats=1-1/8 Thickness=27/64
Stainless Steel, Coarse Thread
14653	Nut,Jam 3/8-16NC HEX SST Width Across Flats=9/16 Thickness=7/32
14662	Nut,Jam 1/2-13NC HEX SST 18-8 Width Across Flats=3/4 Thickness=5/16
14680	Nut,Jam 5/8-11NC HEX Width Across Flats=15/16 Thickness=3/8 18-8 SST
14690	Nut,Jam 3/4-10NC HEX SST Width Across Flats=1-1/8 Thickness=27/64