OEM 18-30-1-737-774 Copper Lock Nut M10 Exhaust Flange

The OEM 18-30-1-737-774 is a genuine copper lock nut designed for exhaust flange applications on BMW vehicles. This M10 x 1.5 hex nut features copper construction that provides superior heat resistance and natural corrosion protection in high-temperature exhaust environments.

Key Features:

• M10 x 1.5 thread size with 10mm hex design
• Copper construction resists corrosion and withstands extreme exhaust temperatures
• Self-locking design prevents loosening from vibration and thermal cycling
• Used at exhaust manifold-to-downpipe and manifold-to-catalytic converter connections
• Requires 15mm wrench for installation

This copper lock nut is an OEM replacement part commonly used throughout BMW's lineup, from classic E-series models through modern F-series vehicles. The copper material creates a superior seal at exhaust flange connections while maintaining fastener integrity through repeated heat cycles. Sold individually.