Simpson Marine Pan Head Screw - #12 x 1" in Type 316 Stainless Steel is engineered by Simpson Strong-Tie for boat building, marine trade, and other applications demanding the highest level of corrosion resistance. Designed to fasten securely in fiberglass, plywood, and wood-substitute materials, this fastener delivers a reliable, long-lasting hold even in saltwater environments, chemical exposure, and other harsh coastal conditions. The pan head profile and high/low serrated thread form make it a go-to choice for marine professionals and DIY boat builders alike.

Key Features

• Type 316 Stainless Steel material and finish - provides the ultimate in corrosion protection, withstanding saltwater, chemicals, and harsh outdoor marine environments where lesser grades would fail.
• High/Low Serrated Thread form - incorporates indentations ("teeth") that cut easily and quickly through high-density materials like fiberglass and wood-substitute composites, reducing drive effort and minimizing material splitting.
• Extra-sharp point - speeds screw starts during assembly, improving installation efficiency and reducing the risk of slipping on smooth or hard surfaces like fiberglass hulls.
• Pan head profile with 0.416" head diameter - provides a broad bearing surface that distributes load evenly, resisting pull-through in softer substrates like plywood and trim materials.
• #3 Phillips drive - compatible with standard #3 Phillips bits, making this fastener easy to drive with common tools used in boat building and marine trade work.
• Sharp Point tip - allows penetration without pre-drilling in many applications, saving setup time when fastening trim, rub rail, and molding to fiberglass boat hulls.
• 0.216" shank diameter - sized for #12 applications, offering sufficient shank strength to maintain holding power in demanding structural and finishing marine assemblies.

Why This Product

• When applying trim, rub rail, or molding to fiberglass boat hulls, this screw's sharp point and high/low serrated threads grip firmly without requiring pilot holes in many situations - keeping the installation process efficient on the water or in the shop.
• Type 316 stainless steel is specifically chosen for environments where saltwater, humidity, and chemical exposure are constant concerns - making this fastener a dependable long-term solution in marine and coastal applications rather than a short-term compromise.
• Simpson Strong-Tie designs this screw specifically for the marine and boat building trade, meaning the thread form, point geometry, and head style are all purpose-matched to fiberglass, plywood, and wood-substitute materials - not adapted from a general-purpose fastener.
• The pan head style is well-suited for surface applications like rub rail and molding attachment where a low-profile, broad-bearing head is preferable to a countersunk flat head, giving installers the right fastener for visible or surface-mounted trim work.

Specifications

• Brand: Simpson Strong-Tie
• Screw Size: #12
• Length (in.): 1
• Head Type: Pan Head
• Head Diameter (in.): 0.416
• Shank Diameter (in.): 0.216
• Drive Type: #3 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

• T12J100PXC: 100 Pk
• T12J100PXM: 1000 Pk

Approved Applications

• Fastening trim, rub rail, and molding to fiberglass boat hulls
• Boat building and marine trade construction
• Fastening into fiberglass panels and surfaces
• Fastening into plywood in marine environments
• Fastening into wood-substitute and composite materials in applications requiring corrosion resistance
• Applications exposed to saltwater, coastal humidity, and chemically caustic conditions

Frequently Asked Questions

What makes Type 316 stainless steel appropriate for marine applications?

Type 316 stainless steel is specifically formulated to provide the ultimate in corrosion protection, making it suitable for environments with continuous saltwater exposure, high humidity, and chemical contact that are common in marine and boat building applications. This material grade is the finish and material used throughout this screw's construction.

What materials can this screw be driven into?

This screw is designed to fasten securely in fiberglass, plywood, and wood-substitute materials. The high/low serrated thread form cuts quickly through high-density materials, and the extra-sharp point speeds penetration to minimize the need for pre-drilling in many situations.

What drive bit is required for this screw?

This screw uses a #3 Phillips drive, which is compatible with standard #3 Phillips bits commonly used in boat building and marine trade work. This drive size corresponds to the #12 screw size.

Is this screw also available in a flat head style?

Yes. According to Simpson Strong-Tie, these stainless steel marine screws are also available in a flat head configuration, giving installers a choice between pan head and flat head depending on the application - for example, countersunk installations versus surface-mounted trim and rub rail work.

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