#10x3-1/2 Marine Grade 316 Stainless Steel Wood Screws - Bulk 300 Pack

Our review of these #10 x 3-1/2 marine grade screws finds them best suited to professionals and serious DIYers who need corrosion-resistant fasteners for outdoor projects. The single biggest reason to buy is the use of Type 316 stainless steel, which gives excellent protection against rust in coastal and wet environments; this review highlights how that metal choice and the 300-piece bulk pack deliver value for decking, fencing, and dock work.

Key Features

• Package Content: The 300-piece kit includes a T25 star drive bit and roughly 17.6 lb of screws, which is convenient when tackling larger projects without repeated trips for supplies.
• Material Quality: Made from Type 316 marine grade stainless steel, the screws resist corrosion and are appropriate for salty or humid environments where ordinary stainless would fail.
• Versatile Use: These screws work with hardwood, softwood, and pressure-treated lumber including ACQ, CA, and CCA, making them useful across typical exterior carpentry tasks.
• Drive and Head Design: The Torx T25 star drive reduces cam-out and speeds installation, while the flat head with nibs leaves a flush, professional finish.
• Point Design: The Type 17 sharp point aids penetration into wood, reducing predrilling in many applications and improving driving consistency.
• Value Pack: A 300-count box supplies enough fasteners for medium to large jobs, which can be more economical for contractors and repeat DIY projects.

Who It's For

These screws are aimed at contractors, boat builders, and homeowners doing deck, fence, boardwalk, or jetty work who need dependable corrosion resistance and bulk quantity. The inclusion of a T25 bit and the flat head finish also appeal to users who want faster, cleaner installs with a star drive that resists stripping.

Those who need extreme tensile strength for structural metal-to-metal connections or where breakage would be catastrophic should consider specialty fasteners rated specifically for high tensile loads. Casual hobbyists doing only a few interior projects may find the marine grade material more than they require.

Pros & Cons

Pros

• Excellent corrosion resistance from Type 316 stainless for coastal and marine exposure.
• Bulk 300-pack and included T25 bit reduce trips to the store and speed job completion.
• Star drive and Type 17 point improve driving control and reduce cam-out and splitting.

Cons

• A small reported failure rate around 2% and some customer notes of limited tensile or snap resistance under extreme loads.

Specifications

Our Verdict

For anyone installing exterior wood in wet or salty conditions, these #10 x 3-1/2 Type 316 screws represent solid value: the marine grade stainless and 300-count packaging make them a practical choice for decks, docks, and fences. They are not a substitute for high-tensile specialty fasteners in extreme load applications, but for general exterior woodworking and marine projects they combine durability, convenience, and a professional finish.

Frequently Asked Questions

Are these screws suitable for saltwater exposure?
Yes, the Type 316 marine grade stainless steel offers superior corrosion resistance for coastal and saltwater environments.

Do these screws work with pressure-treated lumber?
Yes, they are specified for use with pressure-treated lumber including ACQ, CA, and CCA.

Is a T25 driver included?
Yes, the package includes a T25 star drive bit for installation.