Simpson #8 x 1-1/4" Pan Head 316 Stainless Steel Marine Screw by Simpson Strong-Tie is purpose-built for boat building and marine trade applications where corrosion protection is non-negotiable. Crafted from Type 316 stainless steel - one of the most chemically resistant alloys available - this fastener holds firmly in fiberglass, plywood, and wood-substitute materials even in saltwater, humidity, and caustic environments. Whether you are attaching trim, rub rail, or molding to a fiberglass boat hull, or tackling any marine construction project that demands long-term performance, this pan head screw delivers the holding strength and corrosion resistance the job requires.

Key Features

• Type 316 stainless steel material and finish - resists saltwater corrosion, chemical exposure, and harsh marine conditions for lasting performance without rust or staining
• High/low serrated thread form - incorporates indentations that cut quickly through high-density materials like fiberglass and plywood, reducing drive time and effort during assembly
• Sharp point tip - speeds up screw starts so fasteners seat faster without pre-drilling in many applications, improving efficiency on the job
• Pan head profile with 0.314 in. head diameter - distributes clamping force over a wider surface area, providing a secure hold on trim, rub rail, and molding without pulling through softer composite materials
• #2 Phillips drive - compatible with the most common drill and driver bits, making this screw ready to use with standard tools already on hand
• 0.164 in. shank diameter in a #8 size - balances strength and material compatibility for fiberglass, plywood, and wood-substitute substrates commonly found in marine construction

Why This Product

• Engineered specifically for marine environments, Type 316 stainless steel goes beyond standard stainless in its resistance to chloride-rich saltwater and chemical exposure - making it the right choice when ordinary fasteners would corrode and fail
• The high/low serrated thread design is optimized for high-density materials like fiberglass and plywood, so you get a secure, tight connection without the thread-stripping or cam-out issues common with general-purpose screws in these substrates
• The pan head configuration is ideally suited for trim, rub rail, and molding installation on fiberglass boat hulls, where a low-profile but wide-bearing head keeps hardware flush and neat without sinking or tearing through the surface
• Simpson Strong-Tie's marine screw line also comes in a flat head option, giving builders and contractors the flexibility to choose the right head style for both exposed and countersunk fastening applications

Specifications

• Brand: Simpson Strong-Tie
• Screw Size: #8
• Length (in.): 1 1/4
• 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
• Material: Type 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• Country of Origin: Taiwan

Available Pack Options

• T08J125PX-RP15: 15 Pk
• T08J125PXC: 100 Pk
• T08J125PXM: 1000 Pk

Approved Applications

• Fastening trim, rub rail, and molding to fiberglass boat hulls
• Marine and boat building construction requiring maximum corrosion protection
• Fastening into fiberglass, plywood, and wood-substitute materials in saltwater and chemically caustic environments

Frequently Asked Questions

Why is Type 316 stainless steel recommended for marine fastening applications?

Type 316 stainless steel offers a higher level of corrosion resistance than standard stainless grades, making it well-suited for environments with saltwater exposure, high humidity, and chemical contact. For boat building and marine trade applications where fasteners are continuously exposed to these conditions, 316 stainless provides the ultimate corrosion protection needed to maintain structural integrity over time.

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 is engineered to cut efficiently through high-density materials, making it especially effective in the composite and synthetic substrates commonly used in marine construction and boat building.

What is the difference between the high/low serrated thread and a standard thread?

The high/low serrated thread form incorporates indentations - sometimes called "teeth" - that cut easily and quickly through high-density materials. This design helps the screw seat faster and grip more securely in materials like fiberglass and plywood compared to a conventional thread profile, reducing installation time and improving holding performance.

Is a pan head the only available head style for this marine screw?

No. According to Simpson Strong-Tie, these stainless steel marine screws are also available in a flat head configuration, giving builders and contractors the option to choose a countersunk style when the application calls for a flush or recessed finish.

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