Briggs & Stratton 84009040 Shoulder Bolt .375 x 0.75 3125-18 x .50 Grade 8

The Briggs & Stratton 84009040 is a genuine OEM shoulder bolt engineered for precision fit and exceptional strength in small engine applications. This Grade 8 fastener features a .375-inch shoulder diameter with a 0.75-inch shoulder length, combined with a .3125-18 (5/16"-18) threaded section measuring 0.50 inches long.

Key Features:

• Grade 8 high-strength construction with 150,000 PSI minimum tensile strength
• Yellow zinc plating provides superior corrosion resistance in outdoor environments
• Precision shoulder design allows for controlled rotation and proper component alignment
• .375" (3/8") shoulder diameter x 0.75" shoulder length
• 5/16"-18 UNC thread x 0.50" threaded length
• Genuine Briggs & Stratton OEM part ensures exact fitment and reliability

Shoulder bolts are specifically designed with a smooth, unthreaded shoulder section between the head and threads, making them ideal for applications requiring pivoting motion or precise spacing in engine assemblies, pulleys, and mechanical linkages. The Grade 8 rating and yellow zinc finish make this fastener suitable for high-stress applications while resisting rust and corrosion in demanding outdoor power equipment environments.