Nuts
Hexagon Nuts
DIN 934 specifies standard metric hexagon nuts with coarse threads.
Nyloc Nuts
DIN 985 specifies low profile (Type T) prevailing torque hexagon nuts incorporating a non metallic nylon insert.
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Thin Nuts (Jam Nuts)
DIN 439 specifies metric thin hexagon nuts, commonly referred to as half nuts or jam nuts.