Best Carbon Steel Hex Bolts in 2026
Daisy
Last Updated: Jul 17, 2026
Daisy
Last Updated: Jul 17, 2026
* 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.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Amazon.com | 9.68 | ✅ | ✅ | ✅ |
Premium grade bolt kit to facilitate installation of exhaust headers
Rated at 170,000 PSI, which is considerably stronger than Grade 8 hardware
Bolts are 3/8" in diameter and have a 1.000 under head length; 16 pieces
Manufactured from black oxide finished chrome moly steel
Heads are traditional hex style, and premium-quality washers are included
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Amazon.com | 9.68 | ✅ | ✅ | ✅ |
Serrated teeth grip header flange surface providing a locking action
Thread-lock patch prevents header bolt torque loss and provides positive thread seal
Combination hex/socket head design for easy installation
Made from high-grade stainless steel to resist rust and corrosion
Material specification Grade 8, 150,000 PSI tensile strength
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| BelMetric | 5.58 | ❌ | ❌ | ❌ |
Flange bolts are fasteners with a hexagonal head for use with a wrench or a socket drive. Sometimes called Frame bolts, flange bolts are different from standard bolts as they are designed with a circular flange / skirt under the head that functions as a built-in washer, distributing force evenly across the surface to which it will be fastened. The flange also helps compensate for excess space in large or misaligned holes yeilding increased resistance to rotational loosening.
Made of Class 10.9 tempered medium carbon steel similar to US Grade 8 and possess strong wear resistance as well as high tensile strength. Mostly used for automotive and fastening applications such as steering and suspension parts, cylinder, and flywheels, and also for high strength mechanical applications and forged parts. The Yellow Zinc finish, aside from the golden aesthetic, provides a marginally better protection from rust and corrosion against water contact than clear zinc or black oxide.
M8 - M12 Diameter JIS (Japanese Industrial Standard) Flange bolts </b> have smaller head sizes than ISO and ANSI type bolts and are commonly used for truck, car, ATV, snowmobile, and motorcycle frames, exhaust, and for securing the outer casing protecting the engine and transmission. This type of bolt is suitable for any use that requires mounting surface protection.
It is important to make sure that when buying a nut to go along with this flange bolt, the steel class (hardness) of the nut is the same as that of the bolt for an optimal strength combination.
BelMetric has been in business for over 40 years providing customers with metric hardware & specialty automotive supplies. We offer an extensive variety of metric fasteners, metric nuts, metric bolts, Time-Sert kits and we stock hard-to-find items like metric brake line fittings, Norma clamps, stainless eye nuts and more.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Lipstick Performance | 5.05 | ❌ | ❌ | ❌ |
Serrated teeth grip header flange surface providing a locking action
Thread-lock patch prevents header bolt torque loss and provides positive thread seal
Combination hex/socket head design for easy installation
Made from high-grade stainless steel to resist rust and corrosion
Material specification Grade 8, 150, 000 PSI tensile strength
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| BelMetric | 5.53 | ❌ | ❌ | ❌ |
Flange bolts are fully-threaded fasteners with a hexagonal head for use with a wrench or a socket drive. Sometimes called Frame bolts, flange bolts are different from standard bolts as they are designed with a circular flange or a skirt under the head that functions as a built-in washer and distributes the force evenly across the surface to which it will be fastened. The flange helps compensate for excess space in large or misaligned holes yielding increased resistance to rotational loosening.
Made of Class 10.9 tempered medium carbon steel similar to US Grade 8 and possess strong wear resistance as well as high tensile strength. Mostly used for automotive and fastening applications such as steering and suspension parts, cylinder, and flywheels, and also for high strength mechanical applications and forged parts. The Zinc finish provides a marginally better protection from rust and corrosion against water contact than clear zinc or black oxide.
<b> M8 - M12 Diameter JIS (Japanese Industrial Standard) Flange bolts </b> have smaller head sizes than ISO and ANSI type bolts and are commonly used for truck, car, ATV, snowmobile, and motorcycle frames, exhaust, and for securing the outer casing protecting the engine and transmission. This type of bolt is suitable for any use that requires mounting surface protection.
It is important to make sure that when buying a nut to go along with this flange bolt, the steel class (hardness) of the nut is the same as that of the bolt for an optimal strength combination.
BelMetric has been in business for over 40 years providing customers with metric hardware & specialty automotive supplies. We offer an extensive variety of metric fasteners, metric nuts, metric bolts, Time-Sert kits and we stock hard-to-find items like metric brake line fittings, Norma clamps, stainless eye nuts and more.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Northeast Fasteners Co., Inc. | 9.76 | ❌ | ❌ | ❌ |
Hex Bolt, Nut and Washer Assortment - Grade 8 - Coarse (USS) - Yellow Zinc - 1025 pieces
Sizes: 1/4, 5/16, 3/8 and 1/2 Inch
Lengths: 3/4, 1, 1 1/2, 2 and 2 1/2 Inch
Includes 24 Hole Metal Storage Compartment with Latch
See Second Image for Detailed Product Information
Here is the list of top-rated brands that were evaluated by PM.
| Brand | Count |
|---|---|
| Bel-Metric | 2 |
| Mr. Gasket | 2 |
| Arp | 1 |
| Northeast Fasteners | 1 |
We've carried out a comprehensive analysis of 511 reviews on hex bolts, using our selection criteria to identify the best options in the fasteners. Our findings reveal that most customers typically select hex bolts priced around $66.55, with top brands including gelisen, cseao, walfront, clipsandfasteners inc, hard-to-find fastener and mellewell and vigrue
Our team of expert editors reviewed these high-quality items and handpicked the top 6 hex bolts for your consideration. We've also done extensive research on numerous sellers, identifying the best ones in the fasteners category. These include cseao, nineone, clipsandfasteners inc, amazon.com and mellewell direct and vigrue-king of screw .
We are dedicated to assisting our users in finding the right bolts Products based on their needs, saving them considerable time when choosing which hex bolts to buy. We take pride in the number of satisfied users we've helped through our thorough and insightful reviews.
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