Simpson #12 x 1-1/2" Pan Head 316 Stainless Steel Marine Screw from Simpson Strong-Tie is purpose-built for boat building and marine trade applications where corrosion resistance is non-negotiable. Crafted from Type 316 stainless steel, this fastener holds firm in fiberglass, plywood, and wood-substitute materials while standing up to saltwater, harsh chemicals, and the punishing conditions of marine environments. Whether you are installing trim, securing rub rail, or attaching molding to a fiberglass boat hull, this marine screw delivers the reliable hold and long-term corrosion protection that demanding applications require.

Key Features

• Type 316 Stainless Steel material - provides the ultimate in corrosion protection against saltwater, chemicals, and severe marine exposure, outlasting standard stainless grades in coastal and offshore conditions.
• High/Low Serrated Thread design - incorporates indentations that cut easily and quickly through high-density materials like fiberglass and wood-substitute panels, reducing drive time and effort during installation.
• Extra-sharp point - speeds screw starts during assembly, minimizing pre-drilling needs and keeping work moving efficiently even in dense substrates.
• Pan head profile with 0.416" head diameter - distributes clamping force across a wider surface area, delivering a secure, flush-bearing hold on trim, rub rail, and molding applications.
• #3 Phillips drive - compatible with standard Phillips drivers for straightforward tool access on the job site or in the shop.
• 0.216" shank diameter at #12 screw size - provides the structural shank strength needed to withstand vibration and movement in boat building applications without stripping or bending.
• 1-1/2" length - suited for penetrating typical fiberglass hull panels and plywood substrates to achieve a secure, lasting mechanical bond.

Why This Product

• Built for the harshest marine environments - Type 316 stainless steel is the preferred alloy for saltwater and chemically caustic conditions, making this screw the right choice when standard fasteners would corrode and fail over time.
• Designed specifically for fiberglass and wood-substitute boat materials - the high/low serrated thread form is engineered to grip high-density substrates that can be difficult for ordinary screws to penetrate cleanly, reducing cracking and material damage.
• Ideal for visible trim and finish work - the pan head profile and Type 316 finish create a clean, professional appearance when applying rub rail, molding, or trim to fiberglass boat hulls where aesthetics matter alongside function.
• Backed by Simpson Strong-Tie's marine fastener engineering - part of a broad range of fasteners developed specifically for the boat building and marine trade, ensuring these screws meet the performance standards professionals rely on.

Specifications

• Brand: Simpson Strong-Tie
• Screw Size: #12
• Length: 1-1/2 in.
• Material: Type 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• Head Type: Pan Head
• Head Diameter: 0.416 in.
• Shank Diameter: 0.216 in.
• Drive Type: #3 Phillips
• Thread Type: High/Low Serrated Threads
• Point Type: Sharp Point
• Country of Origin: Taiwan

Available Pack Options

• T12J150PX-RP8: 8 Pk
• T12J150PXC: 100 Pk
• T12J150PXM: 1000 Pk

Approved Applications

• Fastening trim, rub rail, and molding to fiberglass boat hulls
• Boat building and marine trade construction
• Securing panels in fiberglass substrate applications
• Fastening plywood and wood-substitute materials in marine environments
• Applications requiring superior corrosion resistance in saltwater or chemically caustic conditions

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 - the substrates most commonly encountered in boat building and marine trade applications. The high/low serrated thread form is specifically engineered to cut cleanly through these high-density materials without causing cracking or splitting.

Why is Type 316 stainless steel used instead of standard stainless steel?

Type 316 stainless steel offers a higher level of corrosion resistance compared to standard grades, making it the preferred material for marine environments where exposure to saltwater and harsh chemicals is ongoing. This fastener is described as providing the ultimate in corrosion protection for exactly these conditions.

What drive tool do I need to install this screw?

This screw uses a #3 Phillips drive, which is the standard drive size for a #12 screw. A standard #3 Phillips screwdriver or compatible power driver bit is all that is needed for installation.

Is this marine screw available in other head styles?

Yes. According to Simpson Strong-Tie, these stainless steel marine screws are also available in a flat head configuration in addition to the pan head style described here. Check available options for the alternate head style to find the right fit for your specific application.

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