Countersunk Bolts #10 w/1in Washer 50pk

Countersunk bolts #10 with 1-inch washers are essential fasteners for engine bay work, bracket assembly, and custom fabrication projects where a flush, professional finish matters. Whether you're securing fuel system components, mounting accessories, or building custom intake manifolds, the countersunk design sits flush with the mounting surface to eliminate protrusion and snag hazards. This 50-pack from ALLSTAR PERFORMANCE ensures you have plenty of stock on hand for projects large and small, making it a smart investment for any serious DIY mechanic or shop environment.

The #10 gauge specification delivers moderate clamping force suitable for light to medium-duty fastening, while the 1-inch washer distributes load evenly across softer materials and composite surfaces common in modern vehicles. The countersink profile (typically 82-degree) creates a clean, aerodynamic appearance—critical for intake runners, custom headers, and visible frame welds where aesthetics and airflow both matter. The zinc plating resists corrosion in engine compartments and underbody environments, extending fastener life even under thermal cycling and moisture exposure typical in automotive applications.

Mechanics and fabricators working on LS swaps, bracket reinforcement, or custom fuel cell installations will appreciate the convenience of a 50-piece assortment, eliminating mid-project trips to the parts counter. The flush-mount profile makes these bolts ideal for applications where clearance is tight or where traditional hex bolts would interfere with hoses, wiring, or moving components. Installation is straightforward—use a #10 countersink bit to match the bolt profile, apply threadlocker if working in high-vibration zones, and torque to manufacturer specs for your specific application.