Simpson #6 x 1/2" Flat Head 316 Stainless Steel Marine Screw by Simpson Strong-Tie is engineered specifically for boat building and marine trade applications where extreme corrosion resistance is non-negotiable. Crafted from Type 316 stainless steel - the grade known for its superior resistance to saltwater, harsh chemicals, and caustic marine environments - this flat head screw fastens securely in fiberglass, plywood, and wood-substitute materials. Whether you are installing trim, rub rail, or molding on a fiberglass boat hull, this marine fastener delivers reliable holding power and long-term durability in the most demanding wet and coastal conditions.

Key Features

• Type 316 Stainless Steel material - provides the ultimate in corrosion protection for saltwater, chemical, and severe marine environments where standard fasteners would rust and fail
• High/Low Serrated Thread form - incorporates serrated indentations ("teeth") that cut quickly and cleanly through high-density materials like fiberglass, plywood, and wood substitutes, reducing installation effort
• Extra-sharp point - speeds screw starts during assembly so you can work faster without pre-drilling in most applications
• Flat head profile with 0.262" head diameter - sits flush with the surface for a clean, low-profile finish ideal for trim, rub rail, and molding installations
• #2 Phillips drive - works with the most common driver bits so you can use standard tools already in your kit
• 0.138" shank diameter with 1/2" length, fully threaded - screws at or under 1" in length are fully threaded, maximizing thread engagement and grip in thin or shallow substrate materials

Why This Product

• Type 316 stainless steel is the material of choice for marine and coastal applications - it withstands saltwater exposure and chemically caustic conditions where lesser grades corrode quickly, making this screw a long-term solution rather than a short-term fix
• The specially engineered high/low serrated thread form is purpose-built to grip fiberglass, plywood, and wood-substitute materials - the exact substrates found in boat hull construction and marine finish work - so you get secure, rattle-free fastening without relying on a generic wood screw
• The flat head geometry allows the fastener to sit flush when applying trim, rub rail, and molding to fiberglass boat hulls, producing a professional finish with no protruding hardware
• Simpson Strong-Tie designs this screw specifically for the boat building and marine trade, meaning the thread geometry, point sharpness, and steel grade all work together as a system - not as repurposed general-purpose hardware

Specifications

• Brand: Simpson Strong-Tie
• Screw Size: #6
• Length (in.): 1/2
• Head Type: Flat Head
• Head Diameter (in.): 0.262
• Shank Diameter (in.): 0.138
• Drive Type: #2 Phillips
• Thread Type: High/Low Serrated Threads
• Point Type: Sharp Point
• Material: Type 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• Country of Origin: Taiwan

Available Pack Options

• T06J050FX-RP25: 25 Pk
• T06J050FXC: 100 Pk
• T06J050FXC -10: 1000 Pk

Approved Applications

• Fastening trim, rub rail, and molding to fiberglass boat hulls
• Boat building and marine trade construction
• Fastening in fiberglass substrates requiring corrosion-resistant hardware
• Fastening in plywood and wood-substitute materials in severe marine environments
• Applications exposed to saltwater, heavy moisture, or chemically caustic conditions

Frequently Asked Questions

What makes Type 316 stainless steel the right choice for marine fasteners?

Type 316 stainless steel is specifically formulated to resist corrosion in saltwater and chemically caustic environments - conditions that would quickly degrade standard stainless or zinc-plated fasteners. Simpson Strong-Tie uses 316 stainless on this marine screw to provide the ultimate in corrosion protection for boat building and coastal applications.

What materials can this screw fasten securely?

This marine screw is designed to fasten securely in fiberglass, plywood, and wood-substitute materials. The high/low serrated thread form incorporates serrated indentations that cut quickly through high-density materials, making it well-suited to the substrates commonly found in boat hull construction and marine finish work.

Is the screw fully threaded at the 1/2" length?

Yes. Screws up to 1" in length are fully threaded, so this 1/2" screw carries threads along the entire shank length. Full threading maximizes grip in shallow or thin substrates, which is especially important when fastening trim and molding to fiberglass surfaces.

Is a pan head version of this screw available?

Yes. Simpson Strong-Tie also offers this marine screw in a pan head configuration. The flat head version covered here is ideal when a flush surface finish is required, such as when applying rub rail or molding where protruding hardware would be undesirable.

Note: Product dimensions and/or thread length may differ from picture. Please see the item description above for specifications.