Hex Bolt Manufacturer

At Gmetalparts, we mainly manufacture carbon steel,alloy steel bolts and nuts ,stainless steel bolts and threaded rods by different standard and grade . Get a free quote!!!

Main Characteristics

Material Medium Carbon Steel, Alloy Steel
Size Metric structural bolts size is M12 to M36, imperial structural bolts size is 1/2” to 1-1/2”
Standards ASTM A325, A490, A307, grade 8.8, 10.9, 12.9
Surface Finish Hot dip galvanizing & Black
Thread Full thread or half thread
Application Construction Fasteners (steel structure, space frame bolts bridge, railway), Oil & Gas Fasteners, Petrochemical Fasteners
Package Small box, or 25kgs/carton, 36cartons/pallet
Delivery 30 days

Standard and customized structural bolts and nuts are available, for structural steel bolts specifications, please feel free to ask us.

Gmetal Hex Bolts

Standard Spec :DIN933,DIN931,DIN6914,A325/A490-Type 1,A-10;BS3692
Diameter :M4-M72(8#-4”)
Material:Carbon Steel ,Alloy Steel ,Stainless Steel
A325/A490 Type 1
ASTMA193 Grade B7/B7M
ASTMA 320 Grade L7/L7M
ASTMA307 Grade A/B
High Strength bolt/Nuts/Washers for structural steel joints
AS1252  ASTM A325M-1 ASTM A490M-1 ,GB/T1228-1231,DIN6914-6916
Metric Size:M12-M36
Inch Size:1/2″-1 1/2″
Coating:Plain ,Black ,ZP,YZP,H.D.G.,Dacromet
Special Bolts for Petrochemical Pipeline
Coating:Plain ,Black,ZP,H.D.G., Teflon
ASTM A193 GRADE B7/B7M DIN975/DIN976 GRADE 4.8/8.8/10.9
SAE J429 GRADE 2/5/8
Stainless Steel Bolts
Metric Size:M6-64
Material:A2-50 A2-70 A4-50 A4-70 A2-80 A4-80
Standard: DIN933,DIN931,DIN601,DIN558,DIN960,DIN7990,DIN961


Stainless Steel Bolts
Inch Size:1/4″-2 1/2″
Material :A2-50 A2-70 A4-50 A4-70 A2-80 A4-80
Standard: ASMEB18.2.1 ,AS1390
Stainless Steel full thread stud
Standard:IFI136  DIN975 DIN976
DIA.:M10-M64  ,3/8″-2 1/2″
GRADE:A2-50 A2-70 A4-50 A4-70 A2-80 A4-80
7 Products Found.

Benefits of Hex Bolts

As a common fastner, Hex Bolts have many advantanges like versatility, protection, reliablity and easy for installation.

  • Our company provide a wide variety sizes of Hex Bolts that they are suitable for different constructions.

  • Protection

    Because we have different surface finishes that eliminates the contract of metal, which made the Hex Bolts can use for long term.

  • Gmetal provides high abrasive and corrosive resistance through a continuous sheath which eliminates fraying and unraveling.

  • Easy of Installation

    The Hex Bolts size has been considered to accommodate the coating thickness assuring a secure fit over the construction.

Applications of Hex Bolts

Hex bolts, also known as hex cap screws or hex head bolts, are one of the most common types of fasteners used across various industries. Their versatility and strength make them suitable for numerous applications. Here are some common uses:

  1. Construction: Hex bolts are widely used in construction projects for securing wood, steel, and other building materials. They are essential in structural applications such as bridges, buildings, and infrastructure projects.
  2. Machinery and Equipment: These bolts are used in the assembly and maintenance of machinery and equipment. They are preferred for their ability to withstand high levels of torque and their reliability in holding components together under various operating conditions.
  3. Automotive Industry: In automotive manufacturing and repair, hex bolts are used to secure components such as engines, frames, and body parts. Their strength and durability are crucial for ensuring the safety and performance of vehicles.
  4. Manufacturing and Assembly: Hex bolts are essential in various manufacturing processes, particularly in the assembly of products where a strong and secure fastening is required. This includes the production of appliances, electronics, and industrial equipment.
  5. Steel Fabrication: In steel fabrication, hex bolts are used to join steel plates and beams. They provide the necessary strength to maintain the integrity of the structure under heavy loads.
  6. Marine Applications: Stainless steel hex bolts are often used in marine environments due to their resistance to corrosion from saltwater. They are used in the construction and repair of boats, ships, and docks.
  7. Home and DIY Projects: Hex bolts are also popular in home improvement and DIY projects for tasks such as building decks, installing fences, and assembling furniture. Their ease of use and availability make them a favorite choice among hobbyists and professionals alike.
Hex Head Bolt
  • “I will never regret to choose Gmetal be the UBolts Manufacturer of our company. The team always avaiable to answer questions which we asked. What’s more, they always solve our problems in a timely manner.”

  • “Gmetal is the best partner of our company, they always sevice us with the many options and the worker of Gmetal teams will give us advices to help us make the best choice for our company. “

Cold Forming in Hex Bolt Manufacturing

Renowned hex bolt manufacturers often utilize a technique known as cold forming. This method involves a series of dies in a machine, shaping a metal blank into the hex bolt’s final dimensions without heating. Large steel wire rods are first straightened and cut to size. The metal, kept at room temperature, is then precisely shaped using these dies under substantial pressure.

After the initial shaping, thread rolling is applied to the hex bolt’s shaft. The bolt then undergoes heat treatment to enhance tensile strength and hardness. To protect against corrosion, a final step often includes zinc coating or hot-dipping. Despite the complexity and precision required in this process, cold forging allows for rapid, large-scale, and consistent production of hex bolts.

Work Hardening in Cold Forming

During cold forming, hex bolts undergo work hardening, enhancing their strength due to the unaltered grain structure of the steel, which is reoriented rather than cut or heated. However, the ability to produce varying sizes of bolts is somewhat limited in cold forming, as larger diameters require more force.

Hot Forging for Larger Bolts

When hex bolts are too large for cold forging or require more pliability, hot forging is employed. This involves heating the steel until it becomes malleable and then shaping it in a die. Hot forging is particularly effective for producing large-diameter bolts, as the heated steel is much more ductile, allowing for more diverse shapes and designs.

Machining Steel Hex Bolts

Machining involves removing and cutting steel to achieve specific bolt specifications. This method has no size or shape limitations, making it ideal for producing complex bolt designs. However, the downside is the material waste generated, and since the grain flow is disrupted, the bolt doesn’t undergo work hardening, potentially reducing its strength.

Types and Grades of Hex Bolts

Hex bolts are categorized based on their strength properties and material composition. In the U.S., common grades are 2, 5, and 8, with each grade indicating increased hardness and tensile strength. Outside the U.S., metric grading is used.

Grade 8 Hex Bolts: Made from carbon-steel alloy, these bolts are used in demanding applications like the military and aerospace, due to their high tensile strength.

Grade 2 Hex Bolts: Constructed from lower-strength carbon steel, these bolts are more cost-effective and suitable for less critical applications.

Selecting the Right Hex Bolt Manufacturer

To ensure optimal results when purchasing hex bolts, it’s crucial to compare multiple manufacturers. Each hex bolt supplier will have different areas of expertise and capabilities. By reviewing their business profiles and contacting them directly, you can gain insights into what each company specializes in. Using a simple RFQ form, you can reach out to multiple businesses simultaneously, making the selection process more efficient.


What specifications and sizes of Hex bolts do you offer?

We offer a wide range of specifications and sizes for Hex bolts, including standard sizes (e.g., M6, M8, M10) and custom sizes. Please let us know your specific requirements, and we will recommend suitable products.

What materials and surface finishes are available for your Hex bolts?

Our Hex bolts can be made from various materials, including carbon steel, stainless steel, and alloy steel. Surface finish options include zinc plating, nickel plating, hot-dip galvanizing, and black oxide to enhance corrosion resistance.

What quality certifications do your Hex bolts have?

Our Hex bolts are ISO 9001 certified and comply with international standards such as DIN, ANSI, ISO, and BS. We also provide third-party inspection reports to ensure product quality.

What is the minimum order quantity for bulk purchases?

Our minimum order quantity is typically 1000 pieces. The exact quantity can be adjusted based on customer requirements and order specifics.

What is the delivery time for bulk purchases?

For standard sizes, the delivery time is usually 3-4 weeks. Custom products may take longer depending on production complexity and quantity.

What is the price for bulk purchases? Are there any discounts?

Pricing depends on the specifications, quantity, and material of the Hex bolts. We offer discounts for large orders. Please contact our sales team for a detailed quote.

Can you provide samples?

Yes, we can provide free samples for your evaluation.

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