DIN 6927 - Prevailing torque all-metal nuts 

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DIN 6927 - Prevailing torque all-metal nuts without serration

DIN 6927 - Prevailing torque all-metal nuts without serration

DIN 6927 - Prevailing torque all-metal nuts without serration

Prevailing torque type hexagon flange lock nuts, all-metal nuts, without serration