Simpson #10 x 1-1/2" Flat Head 316 Stainless Steel Marine Screw by Simpson Strong-Tie is engineered for boat building and marine trade applications where corrosion resistance is non-negotiable. Crafted from Type 316 stainless steel - one of the most corrosion-resistant alloy grades available - this fastener withstands saltwater exposure, harsh chemicals, and the demanding conditions of coastal and marine environments. Designed to drive cleanly and hold firmly in fiberglass, plywood, and wood-substitute materials, it is the trusted choice for professionals applying trim, rub rail, and molding to fiberglass boat hulls.

Key Features

• Type 316 Stainless Steel material - provides the ultimate in corrosion protection for saltwater, marine, and chemically caustic environments, outlasting standard stainless grades in harsh conditions
• High/Low Serrated Thread form - incorporates indentations ("teeth") that cut easily and quickly through high-density materials like fiberglass and plywood, reducing drive effort and improving holding power
• Extra-sharp point - speeds screw starts during assembly, saving time and reducing the chance of surface damage when working with boat hulls and composite materials
• #2 Phillips drive - works with widely available Phillips bits and drivers, making these fasteners practical for both field and shop use
• Flat head profile with 0.363 in. head diameter - sits flush with or below the surface after installation, creating a clean, snag-free finish on trim, molding, and rub rail applications
• 0.190 in. shank diameter at #10 screw size - provides a strong, reliable grip in fiberglass and engineered wood-substitute materials without splitting or over-stressing the substrate

Why This Product

• When fastening trim, rub rail, or molding to a fiberglass boat hull, ordinary screws corrode quickly in saltwater and marine atmospheres - Type 316 stainless steel is specifically suited for these severe marine conditions, giving long-term holding strength without rust bleed or fastener failure
• The high/low serrated thread geometry drives cleanly into dense, hard-to-penetrate materials like fiberglass and plywood substrates, reducing the risk of stripped threads or surface cracking that can occur with standard thread forms
• A flat head design ensures a flush, professional finish on visible boat hull surfaces, making this screw ideal where aesthetics and smooth surfaces matter alongside structural performance
• Simpson Strong-Tie's broad fastener range for marine applications means this screw is backed by engineering designed for boat building and marine trade professionals - not a general-purpose fastener adapted for marine use

Specifications

• Brand: Simpson Strong-Tie
• Screw Size: #10
• Length (in.): 1 1/2
• 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

• T10J150FX-RP12: 12 Pk
• T10J150FXC: 100 Pk
• T10J150FXM: 1000 Pk

Approved Applications

• Fastening trim, rub rail, and molding to fiberglass boat hulls
• Boat building and marine trade assembly work
• Securing fiberglass panels and components where corrosion protection is required
• Fastening into plywood and wood-substitute materials in marine or chemically caustic environments

Frequently Asked Questions

Why is Type 316 stainless steel used for marine fasteners instead of standard stainless steel?

Type 316 stainless steel contains a higher level of corrosion-resistant alloys compared to standard grades, making it well-suited for applications that require the ultimate in corrosion protection - particularly in saltwater, marine environments, and areas exposed to chemically caustic conditions. This is why Simpson Strong-Tie specifies this material for their marine screw line.

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 cuts easily through high-density materials, making them practical for a range of marine construction substrates.

What does the flat head design mean for my installation?

The flat head profile is designed to sit flush with or countersink below the surface of the material, providing a smooth, snag-free finish. This is especially important when applying trim, rub rail, and molding to fiberglass boat hulls where a clean surface profile is both functional and aesthetic.

Are these marine screws available in other head styles?

Yes. According to Simpson Strong-Tie product information, these stainless steel marine screws also come in a pan head style, giving installers flexibility depending on the application and surface requirements.

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