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
Grade 2 Hex Jam Nut SAE Fine Zinc 5/8-18, Hex Jam Nuts
Hillman 3/4"-16 Stainless Steel Jam Nut (5-Pack) 43472 - The Home Depot
3/4 Hex Steel Jam Nut-5/8-18 (25 Pack)
M8-1.25 Thread, 13 mm Hex Wd, Hex Nut - 484Y68
STANDARD STEEL RH JAM NUTS – QS Components, Inc.
10-32 X 11/32 X 1/8 Fine Thread Hex Machine Screw Nut Small, 60% OFF
50 OF 5/8-18 X 3/8 THICK, WRENCH SIZE 15/16 (Fine Thread). We will customize the order to the quantity, LARGE OR SMALL, that you desire.
(50) 5/8-18 Hex Jam Nuts Zinc Plated - Thin / Half Nut 5/8x11 Nuts 5/8 x 18
Stainless Steel Left Hand Thread Hex Jam Nuts
Hillman 1/2"-20 Stainless Steel Jam Nut (8-Pack) 43475 - The Home Depot