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 |
|---|---|---|---|---|
| VIGRUE-KING OF SCREW | 9.88 | ✅ | ✅ | ✅ |
Head Style: Flanged Hex; Pitch: M8-1.25mm; Finish: Stainless Steel; Socket wrench: 13mm; Full UNC Thread; Metric flanged hex bolts - DIN6921
Sizes: M8 x 16/20/25/30mm Flanged Hex Head Bolts pair with serrated flange lock nuts and washers.
Flange Design: there have a flange on the bottom of the bolts head and the flange nuts, which distributes the load like a spring washer; And serred flange make it screw firmly
Easy to Get the Exact Sizes: The bolts and nuts come in a portable firm clear box with corresponding sizes label. It is convenient for you to put away and store, which allow you to get the one you need quickly, improving your project efficiently.
High Quality: these bolts set are made of good A2-70 stainless steel 18-8 (304) material, featuring with higher hardness & great tensile strength, offering corrosion resistance even in severe surroundings.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| VIGRUE-KING OF SCREW | 9.88 | ✅ | ✅ | ✅ |
✔Head Style: Flanged Hex(Non-Serrated); Pitch: M6-1.0 M8-1.25mm; Finish: Black Zinc Plated; Wrench Size: M6(8mm) M8(10mm); Full UNC Thread
✔Screw Type: M6-1.0 M8-1.25 DIN 1662 metric hex flange bolts screws lock nuts washers assortment kit.
✔Sizes: M6 x 12/16/20/25/30mm, M8 x 16/20/25/30mm Flanged Hex Head Bolts pair with serrated flange lock nuts and washers.
✔Class 10.9 Steel are considered hardened, providing a high strength, high tensile fastening solution, coated with zinc black provides these m6 and m8 flange bolts better rust resistance, won't strip easily.
✔ 3X Rust Protection German Coating Tech- VIGRUE m6 m8 black flange bolts incorporate German coating anti-rust technology, offer a threefold increase in rust protection compared to other brand regular screws.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Mellewell Direct | 9.83 | ✅ | ✅ | ✅ |
Material : High quality alloy steel class 10.9, provides great strength and corrosion resistant.
Screw Type : M6 metric flanged bolts
Specification : Full thread, Pitch: 1.0mm. Screw Length : 16mm (Excluding Head). Diameter of head: 13mm. Diameter of hex washer: 18mm. Height of head: 8.1mm.
Package Included : 25 PCS.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Performance Parts Racing | 9.66 | ❌ | ❌ | ❌ |
Made from carbon steel
8mm-1.25 x 25mm
Compact hex head and flange ideal for space is tight
Black oxide finish
Resists corrosion and provides clean professional appearance
| 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 |
|---|---|---|---|---|
| VIGRUE-KING OF SCREW | 9.93 | ✅ | ✅ | ✅ |
Screw Type: M6-1.0 M8-1.25 Metric flanged hex bolts; Full thread; Thread Type: Coarse Thread/ UNC
M6 Bolts Specification: Pitch 1.0 mm. Thread Diameter 6 mm; Screw Length include: 12mm/16mm/20mm/25mm/30mm (Excluding Head). Totally 43 pieces screws + 44 pieces M6 nuts.
M8 Bolts Specification: Pitch 1.25 mm. Thread Diameter 8 mm; Screw Length include: 16mm/20mm/25mm/30mm (Excluding Head). Totally 34 pieces screws + 34 pieces M8 nuts.
10.9 Alloy Steel: Class 10.9 Steel are considered hardened, providing a high strength, high tensile fastening solution, coated with zinc black provides better rust resistance, won't strip easily.
Flange Design: There have a flange on the bottom of the bolts head, which distributes the load like a washer; And serred flange make it screw firmly. Flanged Bolts are great to have around for use in wood and wet environments.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| JROUTH | 8.26 | ✅ | ✅ | ✅ |
Flanged Hex Bolts Specification: M6 Bolts Pitch 1.0 mm. Thread Diameter 6 mm; Screw Length include: 12mm/16mm/20mm/25mm/30mm. M8 Bolts Pitch 1.25 mm. Thread Diameter 8 mm; Screw Length include: 16mm/20mm/25mm/30mm.
Flange Design: There have a flange on the bottom of the bolts head, the flange design distributes the load evenly, reducing stress concentration and extending the service life of the bolts. Hex head design of these bolts provides stability and prevents loosening, ensuring safety and reliability.
10.9 Class Alloy Steel: High quality 10.9 grade alloy steel, great strength and corrosion resistance to some extent to make fasteners last. Flanged Hex Bolts can withstand heavy loads and provide stability and reliability in any field that requires high strength and stability.
Package Included: Flanged bolts kit, including M8-1.25 x 16/20/25/30mm (matching with nuts, flat and spring washers) and M6-1.0 x 12/16/20/25/30mm bolts (matching with nuts, flat and spring washers). Total 360 pcs hex bolts nuts washers assortment kit, meet various needs.
Wide Range of Uses: Flange hex head bolt kits are ideal for those who need high strength screws for mechanical equipment, automotive, industrial equipment and construction structures. These bolts are an important part of any project that requires stability and security.(If there is any damage during transportation, please contact us promptly. we will give you a professional service and reply you within 24 hours. We will do our best to provide you a pleasure shopping experience. )
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Comfort Buy Direct | 9.92 | ✅ | ✅ | ✅ |
✔Screw Type: M6-1.0 M8-1.25 Metric flanged hex bolts; Full thread; Thread Type: Coarse Thread/ UNC.
✔M6-1.0 Metric flanged hex bolts: M6-1.0×12mm*10pcs, M6-1.0×16mm*10pcs, M6-1.0×20mm*12pcs, M6-1.0×25mm*15pcs, M6-1.0×30mm*8pcs, M6 flanged nuts*55pcs
✔M8-1.25 Metric flanged hex bolts: M8-1.25×16mm*12pcs, M8-1.25×20mm*10pcs, M8-1.25×25mm*18pcs, M8-1.25×30mm*13pcs, M8-1.25×40mm*4pcs, M8 flanged nuts*48pcs
✔Class 10.9 Alloy Steel: Which are considered hardened, providing a high strength, high tensile fastening solution, coated with zinc black provides these m6 and m8 flange bolts better rust resistance, won't strip easily.
✔Flange Design: There have a flange on the bottom of the bolts head, which distributes the load like a washer; And serred flange make it screw firmly. Flanged Bolts are great to have around for use in wood and wet environments.
Green Protection: FOLIV is donating from this purchase to White Memorial Conservation Center Inc., which is providing year-round environmental education programs for children and adults to protect natural resources (i.e. vegetation, water, soil, and air). Hope we could do something for this beautiful green world.
| 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 |
|---|---|---|---|---|
| Allied Titanium | 8.43 | ❌ | ❌ | ❌ |
M8-1.25 Pitch X 25mm Allied Titanium Hex Head Bolt
TRUE TITANIUM(TM) - Stronger, Lighter and Corrosion Free
Titanium is good for use in or near saltwater
General Tolerance: +0/-0.27 mm
Meets ISO 4014; Grade 5 (Ti-6Al-4V) Titanium with Polished Finish
Here is the list of top-rated brands that were evaluated by PM.
| Brand | Count |
|---|---|
| Vigrue | 3 |
| Bel-Metric | 2 |
| Allied Titanium | 1 |
| Foliv | 1 |
| Jrouth | 1 |
| Mellewell | 1 |
| Mr. Gasket | 1 |
We've carried out a comprehensive analysis of 975 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 $35.76, 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 10 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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