Simpson #8 x 3/4" Flat Head 316 Stainless Steel Marine Screw by Simpson Strong-Tie is engineered for demanding boat building and marine trade applications where superior corrosion resistance is non-negotiable. Crafted from Type 316 stainless steel - the material of choice for saltwater, chemical, and harsh marine environments - this fastener drives cleanly and securely into fiberglass, plywood, and wood-substitute materials. Whether you are attaching trim, rub rail, or molding to a fiberglass boat hull, this screw delivers lasting hold with the corrosion protection that marine and coastal applications demand.

Key Features

• Type 316 Stainless Steel material - provides the ultimate in corrosion protection in saltwater, marine, and chemically caustic environments, making it a long-lasting fastener solution for exposed applications
• High/Low Serrated Thread design - incorporates indentations that cut easily and quickly through high-density materials like fiberglass and wood-substitute panels, reducing drive effort and improving holding power
• Extra-sharp point - speeds screw starts during assembly so installers work faster with less pre-drilling required in eligible materials
• Flat head profile with 0.312" head diameter - sits flush against the surface for a clean, finished appearance on trim, rub rail, and molding installations
• #2 Phillips drive - compatible with the most common power and hand drivers on job sites, reducing the need for specialty tooling
• 0.164" shank diameter - sized appropriately for #8 screw applications, balancing strength and material compatibility in fiberglass and plywood assemblies

Why This Product

• Type 316 stainless steel is specifically selected for applications exposed to severe marine conditions and many chemically caustic environments - this is not a general-purpose fastener repurposed for marine use, but a dedicated marine-grade screw built for the task
• The high/low serrated thread form is specially engineered for fiberglass, plywood, and wood-substitute materials, giving installers a secure, vibration-resistant hold in the composite and synthetic materials commonly found in modern boat construction
• The flat head design is ideal for trim, rub rail, and molding work on fiberglass boat hulls where a flush, low-profile finish is critical to both appearance and function
• Simpson Strong-Tie's broad fastener line for boat building and marine trade means this screw is designed within a system - it is also available in a pan head configuration for applications where a flush seating is not required

Specifications

• Brand: Simpson Strong-Tie
• Material: Type 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• Screw Size: #8
• Length (in.): 3/4
• Head Type: Flat Head
• Head Diameter (in.): 0.312
• Shank Diameter (in.): 0.164
• Drive Type: #2 Phillips
• Thread Type: High/Low Serrated Threads
• Point Type: Sharp Point
• Country of Origin: Taiwan

Available Pack Options

• T08J075FXC: 100 Pk
• T08J075FXM: 1000 Pk

Approved Applications

• Fastening trim, rub rail, and molding to fiberglass boat hulls
• Securing components in fiberglass boat building and marine trade construction
• Fastening into plywood and wood-substitute materials in applications exposed to severe marine conditions
• Applications requiring corrosion protection in chemically caustic or saltwater environments

Frequently Asked Questions

What materials is this marine screw designed to fasten into?

This screw is designed to fasten securely in fiberglass, plywood, and wood-substitute materials. Its high/low serrated thread form is specially engineered to cut through high-density materials quickly and effectively, making it well-suited for boat building and marine construction assemblies.

Why is Type 316 stainless steel used instead of standard stainless steel for this screw?

Type 316 stainless steel provides the ultimate in corrosion protection and is specifically suited for applications exposed to severe marine conditions and many chemically caustic environments. This material choice makes it a dependable option wherever long-term fastener integrity in harsh, wet, or chemically active conditions is required.

Is this screw fully threaded along its entire length?

Yes - at 3/4" in length, this screw falls within the range of screws that are fully threaded. Screws up to 1" in length are fully threaded, while screws longer than 1" are threaded for 2/3 of the shank length.

Does this flat head marine screw come in other head styles?

Yes. According to Simpson Strong-Tie, this stainless steel marine screw is also available in a pan head configuration for applications where a raised, non-flush head profile is preferred.

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