GB/T 802.5-2009

Prevailing torque type hexagon acorn nuts with non-metallic insert - Welding type

DIN 986-1987

Prevailing torque type hexagon domed cap nuts with nonmetallic insert

DIN 986-1987

Prevailing torque type hexagon domed cap nuts with nonmetallic insert(big on edge)

DIN 986-2000

Prevailing torque type hexagon domed cap nuts with nonmetallic insert

CNS 4315-1983

Self-locking domed cap nuts