1/4 in x 1-1/2 in Carriage Bolt Kit (100 Pack) - Hot Dip Galvanized

In this review the 1/4 in x 1-1/2 in carriage bolt kit is assessed for builders and homeowners who need a bulk fastener solution for outdoor projects. The bottom line: this kit delivers consistent hardware and reliable corrosion protection thanks to its hot dip galvanized coating, making it a practical choice for decks, pergolas and other exterior builds where long-lasting fastening and semi-flush appearance matter.

Key Features

• Complete kit: Includes 100 carriage bolts, 100 USS flat washers and 100 hex nuts so a full project run can be started without searching for matching parts.
• Hot dip galvanized coating: Provides superior corrosion resistance suited to exterior use and compatible with ACQ treated lumber.
• Semi-flush flat head: The flat head gives a neat semi-flush finish that works well on decks, gazebos and pergolas where a lower profile is desired.
• Standard sizing: 1/4 in diameter with 1-1/2 in length and 1/4-20 nut thread size simplifies selection and matches common carpentry needs.
• Meets industry standards: Conforms to relevant dimensional and material standards for reliable fit and function in heavy duty applications.

Who It's For

This kit is aimed at contractors, deck builders and DIYers who need a high-volume supply of carriage bolts that will resist rust outdoors. The included USS washers and Grade 2/A hex nuts mean purchasers get matched hardware useful for structural timber connections and general exterior fastening.

Those who need specialized high-strength or finished decorative hardware should look elsewhere; this kit prioritizes corrosion resistance and bulk value rather than premium cosmetic finishes or higher tensile grades for extreme load applications.

Pros & Cons

Pros

• High value: 100 complete sets provide good value for medium to large projects.
• Durable finish: Hot dip galvanized coating offers long-term corrosion protection for exterior use.
• Convenient sizing: Standard 1/4 in by 1-1/2 in dimensions and 7/16 in wrench size for the nut make installation straightforward.
• Ready for treated lumber: Specified as suitable for ACQ treated lumber which reduces concern about galvanic reaction on decks.

Cons

• Not a high-tensile fastener: Grade 307A and Grade 2/A nuts are appropriate for general structural use but not for applications requiring high-strength bolts.

Specifications

Bolt diameter	1/4 in
Bolt length	1-1/2 in
Head diameter	0.578 in
Washer outside diameter	47/64 in
Nut thread	1/4-20
Nut wrench size	7/16 in
Finish	Hot dip galvanized

Our Verdict

The 1/4 in x 1-1/2 in carriage bolt kit is a practical, value-oriented choice for outdoor projects that need matched hardware in bulk. It is recommended for deck and pergola builders and homeowners who want reliable corrosion resistance and a semi-flush appearance, while those needing high-tensile specialty bolts should choose a different product.

Frequently Asked Questions

Are these bolts suitable for treated lumber?
Yes, the hot dip galvanized finish is specified as suitable for use with ACQ treated lumber.

What is included in the kit?
The kit includes 100 carriage bolts, 100 USS thick flat washers and 100 Grade 2/A hex nuts.

What wrench size is needed for the nuts?
The nuts use a 7/16 in wrench size.