Simpson #8 x 1" Pan Head 316 Stainless Steel Marine Screw by Simpson Strong-Tie is a purpose-built fastener engineered for boat building, marine trade work, and any application demanding the ultimate in corrosion protection. Constructed from Type 316 stainless steel - a marine-grade alloy renowned for its ability to withstand saltwater exposure, harsh chemicals, and severe coastal environments - this screw is ideal for securing trim, rub rail, and molding to fiberglass boat hulls. It drives cleanly into fiberglass, plywood, and wood-substitute materials, delivering a secure, long-lasting hold even in the most demanding wet and chemically caustic conditions.

Key Features

• Type 316 Stainless Steel material - provides superior corrosion resistance in saltwater, marine, and chemically aggressive environments, outlasting standard stainless or zinc-plated alternatives in harsh conditions.
• High/Low Serrated Thread form - incorporates indentations ("teeth") that cut quickly and efficiently through high-density materials like fiberglass and wood-substitute composites, reducing drive effort and preventing material tear-out.
• Extra-sharp point - speeds screw starts during assembly so work moves faster, especially when working with dense or layered boat hull materials.
• Pan head profile with 0.314" head diameter - delivers a broad bearing surface that seats flush against trim, rub rail, and molding without countersinking, providing a clean finished appearance on fiberglass surfaces.
• #2 Phillips drive - compatible with standard drill drivers and Phillips bits, making this fastener easy to use with common marine and construction tooling.
• 1" length with 0.164" shank diameter (#8 size) - sized to fasten trim, rub rail, and molding securely without over-penetrating thin fiberglass hull panels or plywood substrates.
• Fully threaded at 1" length - maximizes thread engagement throughout the entire shank for maximum holding strength in fiberglass and wood-substitute applications.

Why This Product

• Engineered specifically for marine environments - Simpson Strong-Tie designed these screws to address the unique demands of boat building and marine trade work, where standard fasteners fail due to rust and corrosion from constant saltwater and moisture exposure.
• Ideal for fiberglass hull finishing work - the pan head profile, sharp point, and serrated thread form work together to make trim, rub rail, and molding installation on fiberglass hulls fast, clean, and secure.
• Type 316 stainless steel goes beyond basic corrosion resistance - this alloy is specifically selected for applications exposed to severe marine conditions and many chemically caustic environments, making it the right choice when long-term fastener integrity is critical.
• Versatile across common marine substrates - performs in fiberglass, plywood, and wood-substitute materials, giving boat builders and marine tradespeople one reliable fastener for multiple decking, hull, and interior finishing applications.

Specifications

• Brand: Simpson Strong-Tie
• Screw Size: #8
• Length (in.): 1
• Material: Type 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• Head Type: Pan Head
• Head Diameter (in.): 0.314
• 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

• T08J100PX-RP20: 20 Pk
• T08J100PXC: 100 Pk
• T08J100PXM: 1000 Pk

Approved Applications

• Marine boat building and marine trade applications
• Fastening wood-to-wood in corrosive or chemically caustic environments
• Applying trim, rub rail, and molding to fiberglass boat hulls
• Fastening into fiberglass, plywood, and wood-substitute materials

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, making it well suited for boat hull finishing work, trim installation, and rub rail attachment on vessels and marine structures.

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

Type 316 stainless steel provides the ultimate in corrosion protection and is specifically chosen for applications exposed to severe marine conditions and many chemically caustic environments. Its elevated resistance to saltwater and chemicals makes it the preferred material for long-term fastener performance in boat building and marine trade work.

What does the High/Low Serrated Thread form do?

The High/Low Serrated Thread form incorporates indentations - sometimes called "teeth" - that cut easily and quickly through high-density materials such as fiberglass and wood-substitute composites. This reduces the effort required to drive the screw and helps achieve a secure hold in materials commonly used in marine construction.

Is this screw fully threaded along its entire length?

Yes - screws at 1" in length are fully threaded, meaning thread engagement runs the complete length of the shank for maximum holding strength in fiberglass, plywood, and wood-substitute substrates.

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