Simpson #6 x 3/4" Flat Head 316 Stainless Steel Marine Screw by Simpson Strong-Tie is a precision-engineered fastener built for boat building, marine trade, and other demanding environments where maximum corrosion resistance is essential. Featuring a Type 316 stainless steel construction, this compact yet capable screw drives securely into fiberglass, plywood, and wood-substitute materials - delivering a firm, lasting hold even in saltwater, chemically caustic, or other harsh conditions. Whether you are attaching rub rail, trim, or molding to a fiberglass hull, this #6 flat head screw offers the grip, sharpness, and corrosion protection the job demands.

Key Features

• Type 316 stainless steel material - withstands saltwater exposure, harsh chemicals, and severe marine environments without corroding, keeping connections secure and structurally sound over time.
• High/Low serrated thread form with indentations ("teeth") - cuts easily and quickly through high-density materials like fiberglass and wood substitutes, reducing drive effort and improving pull-through resistance.
• Extra-sharp point - speeds up screw starts during assembly, reducing the need for pre-drilling in many applications and saving installation time.
• #2 Phillips drive - compatible with the most common driver bits, making this fastener straightforward to install with standard tools already on hand.
• Flat head profile with 0.262" head diameter - sits flush with the surface after installation, producing a clean, finished appearance on trim, molding, and rub rail applications.
• 3/4" length with 0.138" shank diameter - sized for attaching thin materials to fiberglass boat hulls, providing adequate bite without over-penetrating delicate substrates.

Why This Product

• Engineered specifically for marine and boat-building use cases, this fastener goes beyond ordinary stainless steel screws - the Type 316 alloy is chosen for applications where saltwater and corrosive chemicals are a constant threat, making it the appropriate choice wherever long-term corrosion protection is non-negotiable.
• The specially engineered high/low serrated thread form is designed to grip fiberglass, plywood, and wood-substitute materials effectively - surfaces that can be challenging for standard thread profiles - giving installers a reliable hold in the materials most common to marine construction and repair.
• The flat head design allows the screw to sit flush after installation, making it ideal for trim, rub rail, and molding applications on fiberglass boat hulls where a clean, low-profile surface finish matters.
• Simpson Strong-Tie's broad fastener lineup for marine applications means this screw is part of a trusted system - and these marine screws are also available in a pan head configuration when a different head profile better suits the application.

Specifications

• Brand: Simpson Strong-Tie
• Screw Size: #6
• Length (in.): 3/4
• Material: Type 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• 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
• Country of Origin: Taiwan

Available Pack Options

• T06J075FX-RP25: 25 Pk
• T06J075FXC: 100 Pk
• T06J075FXM: 1000 Pk

Approved Applications

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

Frequently Asked Questions

What materials can this marine screw fasten into?

This screw is designed to fasten securely in fiberglass, plywood, and wood-substitute materials. The high/low serrated thread form with indentations cuts easily and quickly through high-density materials, making it well-suited to these substrates common in boat building and marine applications.

Why is Type 316 stainless steel used for marine screws?

Type 316 stainless steel is the material of choice for applications exposed to severe marine conditions or many chemically caustic environments. It provides the ultimate in corrosion protection, resisting the degradation that saltwater and harsh chemicals can cause over time - helping maintain a secure, lasting connection in demanding outdoor and marine settings.

Is the #6 x 3/4" flat head marine screw fully threaded?

Yes. Screws up to 1" in length are fully threaded. Since this screw is 3/4" long, the entire shank length carries the high/low serrated thread form, maximizing grip and holding power in the material being fastened.

Are these flat head marine screws available in other head styles?

Yes. According to Simpson Strong-Tie, these stainless steel marine screws also come in a pan head configuration, giving you flexibility to select the head profile that best suits your specific installation or application requirements.

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