3/8 in x 2 in (50 Pack) Galvanized Carriage Bolt Kit - Exterior Use

In this review the 3/8 in x 2 in (50 Pack) Galvanized Carriage Bolt Kit is assessed for outdoor woodworking and light structural projects. The bottom line: this kit is aimed at homeowners and builders who need a bulk supply of durable carriage bolts that resist corrosion, and the single biggest reason to buy is the hot dip galvanized coating paired with Grade 307A bolts that hold up in exterior conditions. The review focuses on real-world use for decks, pergolas and fence rails, based on the kit contents and customer feedback.

Key Features

• 3/8 in diameter: provides a solid shaft for connecting heavy timbers without excessive wobble, suitable for common deck and fence materials.
• 2 in length: works well for through-bolting common rail and joist thicknesses where a semi-flush finish is desired.
• Hot dip galvanized coating: offers superior corrosion resistance for exterior installations compared with plain zinc plating.
• Complete kit: includes 50 carriage bolts, 50 USS thick washers and 50 hex nuts so the hardware is ready for multi-point projects without separate purchases.
• Flat head design: the rounded square-neck carriage bolt head gives a semi-flush look and keeps fasteners from spinning when tightening the nut.

Who It's For

This kit is best for DIYers, contractors and property owners who install decks, pergolas, gazebos, fence rails or other exterior woodwork and need a bulk pack of consistent hardware. The combination of Grade 307A bolts, USS washers and grade 2 nuts makes it useful where weather resistance and repeatable connections matter.

Those who need specialty finishes, stainless steel for marine exposure, or non-standard lengths should look elsewhere; this kit is focused on common exterior applications where hot dip galvanized protection and standard 3/8 in hardware are appropriate.

Pros & Cons

Pros

• Durable hot dip galvanized finish that stands up to outdoor exposure.
• Complete 150-piece kit (bolt, washer, nut) saves time sourcing matched hardware.
• Flat head carriage bolts provide a tidy, semi-flush appearance for visible connections.
• Grade 307A bolts and grade 2 nuts offer reliable strength for typical deck and fence work.

Cons

• Washers receive mixed feedback from customers, so some installers may prefer to substitute different thicknesses for specific fits.
• Grade 2 nuts are standard but not as strong as higher grade fasteners for heavy structural loads.

Specifications

Diameter	3/8 in
Length	2 in
Head diameter	0.813 in
Washer outside diameter	1 in
Nut wrench size	9/16 in
Kit contents	50 carriage bolts, 50 USS thick washers, 50 hex nuts
Finish & grade	Hot dip galvanized; Grade 307A bolts, grade 2 nuts

Our Verdict

For most outdoor carpentry tasks this carriage bolt kit is a practical, cost-effective choice: the hot dip galvanized finish and Grade 307A bolts deliver weather resistance and consistent performance, and the 50-pack supplies multiple connections without repeated shopping. Buy it if you want reliable exterior fasteners at good value; those needing premium structural grades or stainless steel should consider alternatives.

Frequently Asked Questions

Are these bolts suitable for decks?
Yes, the 3/8 in x 2 in size with hot dip galvanized coating and USS washers is appropriate for many deck railing and framing connections.

Do the bolts come with washers and nuts?
Yes, the kit includes 50 USS thick washers and 50 hex nuts matched to the 3/8 in bolts.

Will the galvanized finish prevent rust?
The hot dip galvanized coating provides superior corrosion resistance for exterior use but stainless steel is recommended for marine environments.