Best Round Carriage Bolts in 2026

Daisy
Last Updated: Jul 17, 2026

At a Glance: Our Top Picks for Round Carriage Bolts

1/4-20 x 3-1/2" Carriage Bolts, Round Head, Square Neck, Stainless Steel 18-8, Full Thread, Plain Finish, Flat Point, Quantity 25 by Fastenere
#TOP1
1/4-20 X 3-1/2" Carriage Bolts, Round Head, Square
9.2
PM SCORE
(6 Sets) 3/8"-16 x 4 Carriage Bolt with Hex Nuts and Flat Washers SAE, Round Head Square Neck Bolts, 304 Stainless Steel 18-8, Full Thread UNC
#TOP2
(6 Sets) 3/8"-16 X 4 Carriage Bolt With
8.1
PM SCORE
3/8X6 Carriage Bolt
#TOP3
3/8X6 Carriage Bolt
7.4
PM SCORE

* PickSmartly editors independently research, review, and endorse the top products through comprehensive data analysis. We may earn a commission for qualifying purchases made through our product links.

Summary of the Best Round Carriage Bolts of 2026

Market Overview
Round Carriage Bolts Reviewed
  • Reviews Analyzed: 578 Items
  • PM Avg. Rating: 5.5 / 10
27 Products Evaluated
  • Highest Price: $104.99
  • Lowest Price: $10.81
  • Avg. Price: $37.54
#TOP1

1/4-20 X 3-1/2" Carriage Bolts, Round Head, Square Neck, Stainless Steel 18-8, Full Thread, Plain Finish, Flat Point, Quantity 25 By Fastenere

FASTENERE
3SBC904C0308
3.00 X 1.00 X 6.00 Inches
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Discount Distributors LLC 6.05

Features

Thread Diameter 0.250"

Head Diameter 0.594"

Head Height 0.145"

Square Neck Height 0.156" / Square Neck Width 0.26"

18-8 Stainless Steel provides strength and offers good corrosion resistance in many environments.

#TOP2

(6 Sets) 3/8"-16 X 4 Carriage Bolt With Hex Nuts And Flat Washers Sae, Round Head Square Neck Bolts, 304 Stainless Steel 18-8, Full Thread Unc

AOESIN
AOE-AM02313-6
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Aoesin 9.95

Features

Standard: ASME/ANSI B18.5

Thread Size: 3/8 inch; Thread Pitch: 16 threads per inch (TPI)

Head Diameter: 0.782 inch to 0.844 inch; Head Height: 0.188 inch to 0.288 inch

Screw Length (include the square neck): 4 inch

Material: 304 Stainless Steel 18-8 that you will probably see in your pans and cookery tools. It's used for a wide variety of home and commercial applications. Because of its slightly higher strength and wear resistance than type 316, it's also used for nuts, bolts, screws and other fasteners.

#TOP3

3/8X6 Carriage Bolt

HILLMAN
812593
4.60 X 7.00 X 3.50 Inches
8.55 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Carriage Bolts are designed to fasten a wooden face to either wood or metal

Flat head provides a semi-flush finish to applications

The heads is designed to eliminate the need for a washer

Square underside of the head is self locking to eliminate the need for a driving tool

Galvanized finish is perfect for rust prevention

Hillman 812584 3/8X3-1/2 Carriage Bolt, 3/8 X 3-1/2-Inch, Galvanized, 50

HILLMAN
812584
5.40 X 4.10 X 3.40 Inches
5.45 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Carriage Bolts are designed to fasten a wooden face to either wood or metal

Flat head provides a semi-flush finish to applications

The heads is designed to eliminate the need for a washer

Square underside of the head is self locking to eliminate the need for a driving tool

Galvanized finish is perfect for rust prevention

#TOP5

1/2X10 Carriage Bolt

HILLMAN
812635
13.40 X 4.80 X 4.60 Inches
11.90 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Carriage Bolts are designed to fasten a wooden face to either wood or metal

Flat head provides a semi-flush finish to applications

The heads is designed to eliminate the need for a washer

Square underside of the head is self locking to eliminate the need for a driving tool

Galvanized finish is perfect for rust prevention

The Hillman Group 4759 3/8"-16 X 3" Elevator Bolts, 4-Pack

HILLMAN
4759
2.50 X 3.81 X 1.43 Inches
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Elevator nuts are made for use with a nut

Plain Steel

Similar to a carriage bolt except the head is thin and flat

Country of Origin: China

#TOP7

5/16-18 X 2-1/2" Carriage Bolts, Round Head, Square Neck, Stainless Steel 18-8, Full Thread, Plain Finish, Flat Point, Quantity 25 By Fastenere

FASTENERE
3SBC905C0208
3.00 X 1.00 X 6.00 Inches
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
FASTENER DEPOT, LLC 9.77

Features

Thread Diameter 0.3125"

Head Diameter 0.719"

Head Height 0.176"

Square Neck Height 0.187" / Square Neck Width 0.32"

18-8 Stainless Steel provides strength and offers good corrosion resistance in many environments.

#TOP8

3/8X5 Carriage Bolt

HILLMAN
7812590
3.30 X 4.40 X 6.90 Inches
7.00 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Carriage Bolts are designed to fasten a wooden face to either wood or metal

Flat head provides a semi-flush finish to applications

The heads is designed to eliminate the need for a washer

Square underside of the head is self locking to eliminate the need for a driving tool

Galvanized finish is perfect for rust prevention

#TOP9

Hillman Group Galvanized Carriage Bolt 1/2” X 4”, 25 Count, Blunt Point, Alloy Steel, Self-Locking Round Head Fasteners, For Wood And Metal, No Washer Needed, Rust-Resistant (812620) 25 Pack

HILLMAN
812620
5.20 X 4.40 X 3.40 Inches
5.71 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Carriage Bolts are designed to fasten a wooden face to either wood or metal

Flat head provides a semi-flush finish to applications

The heads is designed to eliminate the need for a washer

Square underside of the head is self locking to eliminate the need for a driving tool

Galvanized finish is perfect for rust prevention

#TOP10

Hillman Group Galvanized Carriage Bolt 5/16” X 6”, 50 Count, Blunt Point, Alloy Steel, Self-Locking Round Head Fasteners, For Wood And Metal, No Washer Needed, Rust-Resistant (812563)

HILLMAN
812563
7.10 X 4.60 X 3.30 Inches
5.84 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Gatzies 9.78

Features

Carriage Bolts are designed to fasten a wooden face to either wood or metal

Flat head provides a semi-flush finish to applications

The heads is designed to eliminate the need for a washer

Square underside of the head is self locking to eliminate the need for a driving tool

Galvanized finish is perfect for rust prevention

#TOP11

Hillman Group Galvanized Carriage Bolt 1/2” X 9”, 25 Count, Blunt Point, Alloy Steel, Self-Locking Round Head Fasteners, For Wood And Metal, No Washer Needed, Rust-Resistant (812633)

HILLMAN
812633
4.50 X 4.80 X 13.20 Inches
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Carriage Bolts are designed to fasten a wooden face to either wood or metal

Flat head provides a semi-flush finish to applications

The heads is designed to eliminate the need for a washer

Square underside of the head is self locking to eliminate the need for a driving tool

Galvanized finish is perfect for rust prevention

#TOP12

Hillman Group Galvanized Carriage Bolt 1/2” X 3-1/2”, 25 Count, Blunt Point, Alloy Steel, Self-Locking Round Head Fasteners, Wood And Metal, No Washer Needed, Rust-Resistant (812617)

HILLMAN
812617
3.20 X 4.30 X 4.40 Inches
5.80 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Carriage Bolts are designed to fasten a wooden face to either wood or metal

Flat head provides a semi-flush finish to applications

The heads is designed to eliminate the need for a washer

Square underside of the head is self locking to eliminate the need for a driving tool

Galvanized finish is perfect for rust prevention

#TOP13

Hillman Group Galvanized Carriage Bolt 1/4” X 4”, 100 Count, Blunt Point, Alloy Steel, Self-Locking Round Head Fasteners, Wood And Metal, No Washer Needed, Rust-Resistant (812524)

HILLMAN
812524
7.00 X 4.60 X 3.40 Inches
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Carriage Bolts are designed to fasten a wooden face to either wood or metal

Flat head provides a semi-flush finish to applications

The heads is designed to eliminate the need for a washer

Square underside of the head is self locking to eliminate the need for a driving tool

Galvanized finish is perfect for rust prevention

The Hillman Group 4758 3/8 X 2-1/2-Inch Elevator Bolt, 4-Pack

THE HILLMAN GROUP
4758
2.50 X 3.81 X 1.43 Inches
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Elevator Nuts Are Made For Use With A Nut

Plain Steel

Similar To A Carriage Bolt Except The Head Is Thin And Flat

From The Brand Name: The Hillman Group

#TOP15

Hillman Group Galvanized Carriage Bolt 3/8” X 10”, 50 Count, Blunt Point, Alloy Steel, Self-Locking Round Head Fasteners, Wood And Metal, No Washer Needed, Rust-Resistant (812599)

HILLMAN
812599
13.30 X 4.80 X 4.70 inches
2.01 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Carriage Bolts are designed to fasten a wooden face to either wood or metal

Flat head provides a semi-flush finish to applications

The heads is designed to eliminate the need for a washer

Square underside of the head is self locking to eliminate the need for a driving tool

Galvanized finish is perfect for rust prevention

#TOP16

1/2X3 Carriage Bolt

HILLMAN
812614
3.40 X 4.60 X 6.90 inches
9.00 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Gatzies 9.78

Features

Carriage Bolts are designed to fasten a wooden face to either wood or metal

Flat head provides a semi-flush finish to applications

The heads is designed to eliminate the need for a washer

Square underside of the head is self locking to eliminate the need for a driving tool

Galvanized finish is perfect for rust prevention

#TOP17

1/2X7 Carriage Bolt

HILLMAN
812627
3.60 X 5.10 X 10.10 Inches
0.27 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Carriage Bolts are designed to fasten a wooden face to either wood or metal

Flat head provides a semi-flush finish to applications

The heads is designed to eliminate the need for a washer

Square underside of the head is self locking to eliminate the need for a driving tool

Galvanized finish is perfect for rust prevention

#TOP18

Hillman Group Galvanized Carriage Bolt 5/16” X 4-1/2”, 50 Count, Blunt Point, Alloy Steel, Self-Locking Round Head Fasteners, Wood And Metal, No Washer Needed, Rust-Resistant (812558)

HILLMAN
812558
5.40 X 4.20 X 3.40 Inches
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Carriage Bolts are designed to fasten a wooden face to either wood or metal

Flat head provides a semi-flush finish to applications

The heads is designed to eliminate the need for a washer

Square underside of the head is self locking to eliminate the need for a driving tool

Galvanized finish is perfect for rust prevention

#TOP19

5/16X2 Carriage Bolt

HILLMAN
812545
0.50 X 0.50 X 5.80 Inches
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Carriage Bolts are designed to fasten a wooden face to either wood or metal

Flat head provides a semi-flush finish to applications

The heads is designed to eliminate the need for a washer

Square underside of the head is self locking to eliminate the need for a driving tool

Galvanized finish is perfect for rust prevention

#TOP20

5/16X3-1/2 Carr Bolt

HILLMAN
812554
3.30 X 4.30 X 4.30 Inches
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Carriage Bolts are designed to fasten a wooden face to either wood or metal

Flat head provides a semi-flush finish to applications

The heads is designed to eliminate the need for a washer

Square underside of the head is self locking to eliminate the need for a driving tool

Galvanized finish is perfect for rust prevention

#TOP21

Hillman Group Galvanized Carriage Bolt 5/8” X 10”, 25 Count, Blunt Point, Alloy Steel, Self-Locking Round Head Fasteners, Wood And Metal, No Washer Needed, Rust-Resistant (812653)

HILLMAN
812653
4.40 X 5.00 X 13.30 Inches
21.30 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Carriage Bolts are designed to fasten a wooden face to either wood or metal

Flat head provides a semi-flush finish to applications

The heads is designed to eliminate the need for a washer

Square underside of the head is self locking to eliminate the need for a driving tool

Galvanized finish is perfect for rust prevention

Hillman Group Galvanized Carriage Bolt 1/4” X 2-1/2”, 100 Count, Blunt Point, Alloy Steel, Self-Locking Round Head Fasteners, Wood And Metal, No Washer Needed, Rust-Resistant (812515)

HILLMAN
812515
4.60 X 4.30 X 3.40 Inches
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Carriage Bolts are designed to fasten a wooden face to either wood or metal

Flat head provides a semi-flush finish to applications

The heads is designed to eliminate the need for a washer

Square underside of the head is self locking to eliminate the need for a driving tool

Galvanized finish is perfect for rust prevention

#TOP23

3/8X4 Carriage Bolt

HILLMAN
812587
6.90 X 4.60 X 3.40 Inches
6.00 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Carriage Bolts are designed to fasten a wooden face to either wood or metal

Flat head provides a semi-flush finish to applications

The heads is designed to eliminate the need for a washer

Square underside of the head is self locking to eliminate the need for a driving tool

Galvanized finish is perfect for rust prevention

#TOP24

Hillman Group Galvanized Carriage Bolt 5/16” X 5”, 50 Count, Blunt Point, Alloy Steel, Self-Locking Round Head Fasteners, Wood And Metal, No Washer Needed, Rust-Resistant (812560)

HILLMAN
812560
6.90 X 4.50 X 3.40 Inches
0.09 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Carriage Bolts are designed to fasten a wooden face to either wood or metal

Flat head provides a semi-flush finish to applications

The heads is designed to eliminate the need for a washer

Square underside of the head is self locking to eliminate the need for a driving tool

Galvanized finish is perfect for rust prevention

#TOP25

3/8X7 Carriage Bolt

HILLMAN
812594
10.00 X 5.10 X 3.60 Inches
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
FASTENER DEPOT, LLC 9.76

Features

Carriage Bolts are designed to fasten a wooden face to either wood or metal

Flat head provides a semi-flush finish to applications

The heads is designed to eliminate the need for a washer

Square underside of the head is self locking to eliminate the need for a driving tool

Galvanized finish is perfect for rust prevention

#TOP26

Hillman Group Galvanized Carriage Bolt 5/8” X 6”, 25 Count, Blunt Point, Alloy Steel, Self-Locking Round Head Fasteners, Wood And Metal, No Washer Needed, Rust-Resistant (812647)

HILLMAN
812647
10.00 X 5.30 X 3.80 Inches
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Carriage Bolts are designed to fasten a wooden face to either wood or metal

Flat head provides a semi-flush finish to applications

The heads is designed to eliminate the need for a washer

Square underside of the head is self locking to eliminate the need for a driving tool

Galvanized finish is perfect for rust prevention

#TOP27

3/8X5-1/2 Carriage Bolt

HILLMAN
812591
3.40 X 4.60 X 6.90 Inches
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Carriage Bolts are designed to fasten a wooden face to either wood or metal

Flat head provides a semi-flush finish to applications

The heads is designed to eliminate the need for a washer

Square underside of the head is self locking to eliminate the need for a driving tool

Galvanized finish is perfect for rust prevention

Top 10 carriage bolts Brands on Amazon

Here is the list of top-rated brands that were evaluated by PM.

Brand Count
Hillman 23
Fastenere 2
Aoesin 1
The Hillman Group 1

Top 10 carriage bolts Brands Pie Chart


We've carried out a comprehensive analysis of 578 reviews on carriage bolts, using our selection criteria to identify the best options in the fasteners. Our findings reveal that most customers typically select carriage bolts priced around $37.54, with top brands including and vigrue and hillman

Our team of expert editors reviewed these high-quality items and handpicked the top 27 carriage bolts for your consideration. We've also done extensive research on numerous sellers, identifying the best ones in the fasteners category. These include and vigrue-king of screw and amazon.com .

We are dedicated to assisting our users in finding the right bolts Products based on their needs, saving them considerable time when choosing which carriage bolts to buy. We take pride in the number of satisfied users we've helped through our thorough and insightful reviews.