Simpson Marine Flat Head Screw - #8 x 1", Type 316 Stainless Steel from Simpson Strong-Tie is engineered for boat building and marine trade applications where corrosion resistance is non-negotiable. Constructed from Type 316 stainless steel, this fastener resists saltwater, chemicals, and the harshest marine environments, making it a trusted choice for securing trim, rub rail, and molding to fiberglass boat hulls. Whether you are working with fiberglass, plywood, or wood-substitute materials, this marine screw delivers a secure, lasting hold where standard fasteners would fail.

Key Features

• Type 316 Stainless Steel material - provides the ultimate in corrosion protection for marine, saltwater, and chemically caustic environments where lesser alloys degrade rapidly.
• High/Low Serrated Thread Type - the specially engineered thread form incorporates indentations ("teeth") that cut easily and quickly through high-density materials like fiberglass and wood-substitute composites, reducing drive torque and saving installation time.
• Sharp Point tip - speeds screw starts during assembly so you can work faster without pre-drilling in many applications.
• Flat Head profile with 0.310" head diameter - sits flush with or below the surface for a clean, finished appearance on boat trim, rub rails, and molding installations.
• #2 Phillips drive - compatible with the most common driver bits, making this fastener easy to use with standard installation tools already on hand.
• 1" length with 0.164" shank diameter - a compact, fully threaded profile ideal for attaching trim and surface materials without over-penetrating thinner substrates.

Why This Product

• Designed specifically for marine and boat building trades, this screw handles the relentless exposure to saltwater, humidity, and corrosive chemicals that would compromise standard stainless or zinc-plated fasteners.
• The high/low serrated thread form grips fiberglass and wood-substitute materials firmly - surfaces that can be notoriously difficult to fasten into - giving you a secure hold without stripping or backing out over time.
• The flat head design creates a flush, professional finish when applying trim, rub rail, and molding to fiberglass boat hulls, eliminating proud fastener heads that catch lines or snag materials.
• Backed by Simpson Strong-Tie's broad range of marine fasteners, this screw is engineered for builders and tradespeople who need dependable performance in severe corrosion environments - not a general-purpose substitute.

Specifications

• Brand: Simpson Strong-Tie
• Screw Size: #8
• Length (in.): 1
• Head Type: Flat Head
• Head Diameter (in.): 0.310
• Shank Diameter (in.): 0.164
• 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

• T08J100FX-RP20: 20 Pk
• T08J100FXC: 100 Pk
• T08J100FXM: 1000 Pk

Approved Applications

• Fastening trim, rub rail, and molding to fiberglass boat hulls
• Boat building and marine trade construction
• Applications requiring fastening into fiberglass substrates
• Fastening into plywood and wood-substitute materials in marine settings
• Applications exposed to severe marine or chemically caustic conditions

Frequently Asked Questions

Why is Type 316 stainless steel specified for marine applications?

Type 316 stainless steel contains molybdenum, which gives it superior resistance to saltwater, chloride-rich environments, and many chemically caustic conditions compared to standard 18-8 (304) stainless. This makes it the material of choice for boat building and marine hardware where long-term corrosion protection is required.

What materials can these screws fasten into?

These marine screws are designed to fasten securely in fiberglass, plywood, and wood-substitute materials. The high/low serrated thread form is specially engineered to cut through high-density materials quickly and hold firmly without backing out.

Is this screw fully threaded?

Yes - at 1" in length, this screw is fully threaded along its entire shank, providing maximum thread engagement and holding power in thinner substrates and surface materials like trim and rub rail.

Does this screw come in a pan head style as well?

Yes. According to Simpson Strong-Tie, these stainless steel marine screws are also available in a pan head configuration for applications where a rounded head profile is preferred over a flush flat head finish.

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