M6/M8/M10 Flange Bolt Kit (549PCS) | Hex Bolts, Nuts & Washers

The Metric 549PCS kit includes M6, M8, and M10 hex flange bolts with matching flange nuts and washers. M6 bolts have a 5mm thread diameter, M8 have 6.5mm, and M10 have 8mm. All follow standard metric thread pitch specifications.

The Metric version uses millimeter-based thread sizing (M6, M8, M10) common in most machinery, imported equipment, and European-standard applications. The SAE version uses inch-based sizing (1/4"-20, 5/16"-18, 3/8"-16) standard in American automotive and structural applications. Choose based on the thread standard of your existing hardware.

Yes. These bolts are rated Class 8.8, which means a minimum tensile strength of 800 MPa — suitable for most automotive bracket mounting, engine bay accessories, and underbody applications. For safety-critical structural components (e.g., suspension, steering), always verify the required grade with your vehicle's service manual.

The zinc-plated finish provides corrosion resistance rated at 400+ hours in salt spray testing, making them suitable for outdoor use in typical weather conditions. For prolonged exposure to saltwater or highly corrosive environments, consider stainless steel fasteners (see our 304 Stainless Steel variant options).

A flange bolt has an integrated circular flange beneath the head that acts as a built-in washer. This distributes the clamping load over a larger surface area, reducing the risk of surface damage and improving joint stability — especially useful on softer materials like aluminum or plastic panels. It also speeds up assembly since you don't need to add a separate washer under the bolt head.

Yes. The kit includes both flat washers (for load distribution) and lock washers (to prevent loosening from vibration). This combination is ideal for applications subject to movement or vibration, such as automotive and machinery installations.

The kit comes in a reusable compartment case with clearly labeled sections for each bolt size and hardware type. Each compartment is sized to hold its contents securely without mixing. The case is resealable, so leftover pieces stay organized for your next project.

Yes. All bolts feature a standard hex head drive compatible with common hex wrenches, combination wrenches, and socket sets. No specialty tools are required.

The 549PCS kit covers M6, M8, and M10 sizes with a higher quantity of M6 fasteners — ideal if you work frequently with smaller metric hardware. The 292PCS variants (available in Black Class 10.9 alloy steel or Silver 304 stainless steel) focus on a more compact assortment, suitable for users who need fewer pieces or prefer a specific material finish.

We offer free standard shipping on qualifying orders. Orders are typically processed within 1–2 business days. Select your variant above and proceed to checkout to see available shipping options and estimated delivery times for your location.