Hexagon Nuts, Metrical Thread, with Polyamide Insert, Self-locking - Nuts DIN 985 (Similar DIN EN ISO 10511), Thin Version, Stainless Steel (652216A4)

Self-locking hexagon nuts, according to the old standard DIN 985, with metric ISO thread.
The standard DIN 985 was replaced by DIN EN ISO 10511. Some of these nuts have different outer dimensions (width across flats or height). But the nut DIN 985 is still used very often.
Note: Nuts from steel or stainless steel tend to stick (seizure) on threaded bars from steel or stainless steel. They must be well lubricated and are movable only for short time at low speed.

Material:
Stainless steel V2A (A2).
Stainless steel V4A (A4).