3/8 in x 2 in (50 Pack) Zinc Carriage Bolt Kit - Durable Fastening

In this review of the 3/8 in x 2 in (50 Pack) Zinc Carriage Bolt Kit by Makers Bolt, the bottom line is straightforward: this kit is for DIYers and builders who need a reliable, ready-made set of carriage bolts and hardware for outdoor projects where a semi-flush finish matters. The reviewer found the kit stood out for its complete components and consistent sizing, making it a practical choice for deck, pergola, gazebo, and general structural fastenings where moderate corrosion resistance and convenience are priorities.

Key Features

• Complete kit: The pack includes 50 carriage bolts, 50 USS thick washers and 50 hex nuts so projects can be started without sourcing individual parts.
• Standard sizing: The 3/8 in diameter and 2 in length provide common, versatile sizing that fits many deck and framing applications.
• Zinc plated: Zinc plating gives moderate corrosion resistance, helping fasteners last longer in exposed outdoor settings compared with plain steel.
• Flat head design: The flat head provides a semi-flush finish that is ideal where a lower profile bolt head is desired on decking and pergola rails.
• Consistent hardware: Grade 307A carriage bolts paired with grade 2 hex nuts and USS washers ensure matching tolerances and predictable assembly.

Who It's For

This kit is aimed at homeowners, weekend carpenters, and pro remodelers who build decks, gazebos, pergolas or similar structures and want a matched set of carriage hardware for repetitive fastening tasks. It is especially useful when semi-flush bolt heads are preferred for aesthetics and to reduce snagging on railings or boards.

Those needing high corrosion resistance for marine environments, stainless steel hardware, or specialty bolt grades should look elsewhere; this zinc plated, grade 307A kit is best for moderate outdoor exposure rather than saltwater or extremely corrosive conditions.

Pros & Cons

Pros

• Complete 50-piece kit saves time by bundling carriage bolts, washers, and nuts for immediate use.
• Zinc plating offers moderate protection against rust for typical outdoor projects.
• Semi-flush flat head reduces protrusion and gives a cleaner finished appearance on woodwork.
• Standard 3/8 in diameter and common 9/16 in wrench size make it easy to work with common tools.

Cons

• Not a stainless option, so long-term corrosion in coastal or highly humid environments may be a limitation.

Specifications

Diameter	3/8 in
Length	2 in
Head diameter	0.813 in
Washer outside diameter	1 in
Nut wrench size	9/16 in
Finish	Zinc plated (moderate corrosion resistance)
Hardware grades	Grade 307A carriage bolts, grade 2 hex nuts, USS flat washers

Our Verdict

The Makers Bolt 3/8 in x 2 in zinc carriage bolt kit is a solid value for general outdoor woodworking and structural projects where a semi-flush finish and matched hardware matter. It saves procurement time and performs well in typical backyard exposures, though anyone needing maximum corrosion resistance should opt for stainless steel alternatives.

Frequently Asked Questions

Are these bolts suitable for outdoor use?
Yes, the zinc plating provides moderate corrosion resistance suitable for typical outdoor projects, but it is not intended for prolonged exposure in marine or highly corrosive environments.

What tools are needed to install these bolts?
You will need a 9/16 in wrench or socket for the hex nuts and a driver or wrench to hold the carriage bolt head while tightening.

Does the kit include washers and nuts?
Yes, the kit includes 50 USS thick washers and 50 hex nuts matched to the 3/8 in carriage bolts.