3/8 x 6 Lag Screw Kit 50 Pack - Hot Dip Galvanized for Outdoors

In this review the 3/8 x 6 Lag Screw Kit is judged as a straightforward, value-oriented fastener pack for outdoor and structural woodworking. The kit includes 50 Grade 307A lag bolts and 50 USS flat washers, and the biggest reason to buy is the Hot-Dip Galvanized finish that provides real rust resistance for projects exposed to weather or ACQ treated lumber. Our review finds it best for builders, deck installers, and DIYers who need a bulk supply of reliable lag screws and washers without paying for specialty coatings or custom lengths.

Key Features

• Quantity and value: The 50-pack of screws and 50 washers supplies enough hardware for medium-sized projects without repeated trips to the store, which saves time and cost.
• Corrosion protection: Hot-Dip Galvanized coating offers superior rust resistance compared to plain steel, making these bolts suitable for exterior use.
• Standards compliance: Meeting ASTM A307, ASME B18.2.1 and related specs ensures consistent dimensions and material characteristics for industrial or commercial projects.
• Washers included: Each lag bolt comes with a USS flat washer (1 in OD) to distribute load and reduce wood crushing around the head during installation.
• ACQ compatibility: The hot-dip finish is appropriate for use with ACQ treated lumber, reducing the risk of accelerated corrosion in preservative-treated materials.
• Installation guidance: The kit notes that a pilot hole is recommended, which helps prevent splitting in hardwoods and ensures proper torque application.

Who It's For

This kit is aimed at contractors, deck builders, and serious DIYers who need a bulk supply of standard 3/8 in by 6 in lag screws for framing, ledger attachments, or heavy timber connections. The combination of washers and a hot-dip finish makes it practical for outdoor structures and projects using pressure-treated lumber.

Those who need specialty alloys, metric sizes, or heads designed for machine-driven installations should look elsewhere. Also, if a project demands higher tensile properties than a Grade 307A bolt or a different corrosion system such as stainless steel, consider a different fastener.

Pros & Cons

Pros

• Generous 50-pack provides good value and convenience for multiple fastenings.
• Hot-Dip Galvanized finish offers durable corrosion resistance outdoors.
• Washers included improve load distribution and reduce wood damage.
• Meets industry standards for dimensions and basic material strength.

Cons

• Some users report mixed hold capacity and occasional breakage under extreme load, so these are not a substitute for higher grade or specialized structural bolts where critical tensile strength is required.

Specifications

Diameter	3/8 in
Length	6 in
Head width	9/16 in
Kit contents	50 lag bolts and 50 USS flat washers (1 in OD)
Material / Grade	Grade 307A
Finish	Hot-Dip Galvanized
Standards	Meets ASTM A307, ASME B18.2.1, ASME B18.21.1, ASTM F2329

Our Verdict

The 3/8 x 6 Lag Screw Kit is a practical choice for outdoor carpentry and general structural fastening where corrosion resistance and quantity matter. It delivers good value with included washers and a hot-dip finish, making it suitable for decks and pressure-treated lumber; those needing extreme tensile strength or specialty fasteners should evaluate higher-grade alternatives.

Frequently Asked Questions

Can these be used with pressure-treated or ACQ lumber?
Yes, the Hot-Dip Galvanized finish is suitable for use with ACQ treated lumber to resist accelerated corrosion.

Are washers included with every bolt?
Yes, the kit contains 50 USS flat washers (outside diameter 1 in), one for each lag bolt in the pack.

Is a pilot hole required?
A pilot hole is recommended to reduce splitting and to allow proper seating and torque during installation, especially in hardwoods.