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

Our review of this 1/4 in x 1-1/4 in carriage bolt kit finds it aimed at homeowners and builders who need a reliable, bulk fastener for outdoor timber projects. The standout reason to choose this kit is its hot dip galvanized coating, which provides superior corrosion resistance and makes the fasteners appropriate for ACQ treated lumber and exposed deck work. The 100-piece set includes carriage bolts, USS flat washers, and hex nuts, so it covers complete connections without separate trips to the hardware store.

Key Features

• Complete kit: Contains 100 carriage bolts, 100 USS flat washers and 100 hex nuts so projects can start without sourcing additional pieces.
• Hot dip galvanized coating: Offers strong corrosion resistance for exterior use, extending service life in decks and pergolas.
• Semi-flush flat head: The carriage bolt flat head gives a semi-flush finish that works well for decking and visible woodwork where a cleaner appearance is desired.
• Standard sizing: 1/4 in diameter with 1-1/4 in length and 1/4 in-20 nut threading simplifies matching to common lumber and brackets.
• Works with ACQ lumber: Material and coating are specified as suitable for ACQ treated lumber, making the kit appropriate for modern pressure-treated projects.

Who It's For

This kit is best for DIY homeowners, deck builders, and small contractors who install fences, decks, pergolas, gazebos or other outdoor structures and want a bulk supply of matched bolts, washers and nuts. The included USS thick washers and Grade 2/A nuts make it practical for heavy duty woodworking where repeated purchase of individual parts would be inconvenient.

Those who need specialized high-strength fasteners for structural steel or critical load-bearing engineered connections should look for higher grade bolts; this kit is presented and specified for general exterior and wood construction rather than high-tensile structural applications.

Pros & Cons

Pros

• Durable hot dip galvanized finish provides long-term corrosion protection for outdoor use.
• Kit format with 100 bolts, washers and nuts delivers clear value and convenience for medium-sized projects.
• Flat head carriage bolts produce a neat, semi-flush appearance for visible woodwork.
• Meets common standards so parts are consistent and compatible with typical hardware.

Cons

• Not intended for high-tensile structural steel applications where higher grade fasteners are required.
• Length limited to 1-1/4 in, so thicker assemblies will need longer bolts.

Specifications

Diameter	1/4 in
Length	1-1/4 in
Head diameter	0.578 in
Nut size / wrench	1/4 in-20 nut, 7/16 in wrench
Washer outside diameter	47/64 in
Kit contents	100 carriage bolts, 100 USS flat washers, 100 Grade 2/A hex nuts

Our Verdict

This 100-piece galvanized carriage bolt kit is a practical, cost-effective choice for outdoor wood projects where corrosion resistance and a tidy semi-flush finish matter. It is good value for homeowners and builders working on decks, pergolas and similar structures, though those needing longer lengths or higher tensile grades should select a different fastener.

Frequently Asked Questions

Are these bolts suitable for pressure-treated lumber?
Yes, the hot dip galvanized coating is specified as suitable for ACQ treated lumber and exterior use.

What is included in the kit?
The kit includes 100 Grade 307A carriage bolts, 100 USS thick flat washers and 100 Grade 2/A hex nuts.

Will the bolt head sit flush with wood?
The flat head is semi-flush; it provides a cleaner finish but may not be fully flush without countersinking.