Prevailing torque type all-metal Hex flange nuts
This International Standard specifies the characteristics of prevailing torque type all-metal hexagon flange nuts and threads from M5 to M20 inclusive, in product grade A for threads up to and including M16 and product grade B for threads above M16, and with property classes 8, 9, 10 and 12.
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clamping forces and prevailing torques for hex flange nuts with fine pitch thread
Hex flange nuts figure