Jam nuts are low-profile nuts that are half as tall as a standard hex nut. It's often used as a type of locknut where it is jammed up against a
5/8-11 Grade 2 Finished Hex Nuts, 62CNFH2Z
3/8 in - Jam Nuts - Nuts - The Home Depot
Hexagon Hex Nut UNF 1/4 5/16 3/8 7/16 1/2 5/8
Everbilt 5/16 in.-18 Zinc Plated Jam Nut (8-Pack) 811541 - The Home Depot
5/8-18 Stainless Nylon Insert Lock Nut Thin Jam Half thick NTE 5/8
Hex Jam Nuts Inch Standards
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5/8-18 Fine Thread Heavy Hex Nut Low Carbon Steel Black Oxide
18-8 Stainless - Nuts - Fasteners - The Home Depot
10-32 X 11/32 X 1/8 Fine Thread Hex Machine Screw Nut Small, 60% OFF