Simpson #10 x 1" Flat Head 316 Stainless Steel Marine Screw by Simpson Strong-Tie is a precision-engineered fastener built for boat building, marine trade, and any application demanding the ultimate in corrosion protection. Crafted from Type 316 stainless steel - the most corrosion-resistant grade commonly used in marine environments - this screw drives cleanly into fiberglass, plywood, and wood-substitute materials, creating a secure, lasting hold even in saltwater exposure and chemically caustic conditions. Whether you are attaching trim, rub rail, or molding to a fiberglass hull, this flat head screw delivers flush, professional results built to endure harsh coastal environments.

Key Features

• Type 316 Stainless Steel material - resists saltwater corrosion, chemical exposure, and the harsh conditions common in marine and boat-building applications, far outlasting standard steel fasteners in wet environments.
• High/Low Serrated Thread form - incorporates indentations that cut quickly and cleanly through high-density materials like fiberglass and plywood, reducing installation effort and improving holding strength.
• Extra-sharp point design - speeds up screw starts during assembly, reducing the time spent positioning and seating each fastener, especially valuable during repetitive trim and rub rail installation.
• Flat Head profile with 0.363 in. head diameter - sits flush with the surface once driven, creating a clean, low-profile finish ideal for trim, molding, and rub rail applications on fiberglass hulls.
• #2 Phillips drive type - compatible with the most widely available driver bits, making this screw easy to install with standard tools found in any marine or woodworking shop.
• Fully threaded 1 in. length - screws at this length are fully threaded along the entire shank, maximizing thread engagement and pullout resistance in the materials being fastened.
• 0.190 in. shank diameter (#10 screw size) - provides the structural strength needed for demanding marine fastening tasks without splitting thinner or more delicate materials.

Why This Product

• Engineered specifically for marine trade applications - Simpson Strong-Tie developed this screw to meet the real-world demands of boat builders and marine contractors, not as a general-purpose fastener repurposed for outdoor use. Type 316 stainless steel provides corrosion resistance specifically suited to saltwater and chemically aggressive environments.
• Works in the most challenging substrates - the high/low serrated thread form is designed to grip fiberglass, plywood, and wood-substitute materials securely, giving installers confidence that trim, rub rail, and hull molding will stay firmly in place over time.
• Flush installation without surface damage - the flat head geometry allows the screw to sit below or flush with the surface, making it the right choice for visible finish applications on boat hulls where aesthetics and surface integrity both matter.
• Fast, reliable assembly - the sharp point and serrated threads work together to reduce the force and time needed to drive each screw, improving productivity on repetitive marine fastening jobs.

Specifications

• Brand: Simpson Strong-Tie
• Screw Size: #10
• Length (in.): 1
• Head Type: Flat Head
• Head Diameter (in.): 0.363
• Shank Diameter (in.): 0.190
• 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

• T10J100FXC: 100 Pk
• T10J100FXM: 1000 Pk

Approved Applications

• Marine fastening - attaching trim, rub rail, and molding to fiberglass boat hulls in saltwater and corrosive environments
• Fastening wood-to-wood - securing plywood and wood-substitute materials in applications requiring high corrosion resistance
• Fiberglass boat building and marine trade construction

Frequently Asked Questions

Why is Type 316 stainless steel recommended for marine applications?

Type 316 stainless steel contains molybdenum, which gives it superior resistance to saltwater, chlorides, and many chemically caustic substances compared to standard 304 stainless steel. This makes it the preferred material for boat building, rub rail installation, and any fastening application exposed to severe marine conditions.

What materials can this screw be driven into?

This marine screw is designed to fasten securely in fiberglass, plywood, and wood-substitute materials. The high/low serrated thread form is engineered to cut efficiently through high-density substrates commonly encountered in boat hull and marine trim applications.

Is this screw fully threaded along its entire length?

Yes. Screws at 1 in. in length are fully threaded along the entire shank, which maximizes thread engagement in the fastened material and provides strong pullout resistance for trim, rub rail, and molding installations.

Does Simpson Strong-Tie offer this marine screw in other head styles?

Yes. According to Simpson Strong-Tie product information, these stainless-steel marine screws also come in a pan head configuration, giving installers options depending on the surface and finish requirements of their specific marine application.

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