Hot Dip Galvanized Hex Bolt and Nut, High Strength Grade 8.8

The bolt is manufactured with a hexagonal head for easy installation using standard spanners, sockets, or torque tools. Carbon steel material gives the fastener reliable strength for daily industrial fastening, while grade 4.8 and grade 8.8 options allow buyers to select the suitable mechanical level according to the load requirement.

For corrosion protection, the product can be supplied with several surface finishes. Plain finish is suitable for indoor or further‑treated applications. Zinc plated finish provides a bright protective layer for general hardware use. Black finish is often selected for machinery, equipment, or appearance‑focused assemblies. Hot dip galvanized finish is recommended for outdoor steel structures, power line hardware, bridge components, solar mounting, tower bolts, and other applications where stronger anti‑rust performance is required.

Specification Table

Key Features

• Carbon steel construction for reliable industrial fastening performance.
• Grade 4.8 and grade 8.8 options for different load and project requirements.
• Hot dip galvanized finish available for outdoor corrosion resistance.
• DIN931, DIN933, ISO4014, and ISO4017 hex bolt options for international procurement.
• M14‑250mm and M14‑300mm listed sizes, with M8‑M72 range available for bulk orders.
• Plain, zinc plated, black, and hot dip galvanized finishes available for different installation environments.
• Matching nuts can be supplied for complete fastening sets.
• OEM and customized processing can be arranged according to drawings or samples.

Applications

These carbon steel hex bolts are suitable for steel structures, construction fastening, machinery assembly, heavy equipment installation, bridge and guardrail projects, power transmission tower hardware, telecom tower connections, solar mounting structures, pipe support systems, warehouse steel frames, and general industrial maintenance.

For outdoor or exposed applications, hot dip galvanized bolts are especially useful because the coating offers stronger protection against moisture, oxidation, and normal weather exposure compared with untreated steel. For indoor hardware or cost‑sensitive assemblies, zinc plated, black, or plain finishes can also be selected.

Material and Grade Explanation

Carbon steel is widely used for hex bolts because it offers stable mechanical performance and economical bulk production.

Grade 4.8 is commonly used for general fastening and medium‑duty applications.

Grade 8.8 provides higher strength and is suitable for structural, machinery, and engineering uses where stronger clamping force and load resistance are needed.

For projects that require higher strength, grade 10.9 and grade 12.9 options can be discussed based on drawings, working conditions, and quantity. The correct grade should be selected according to the load, mating parts, installation torque, coating requirement, and applicable project standard.

Packaging and Supply

The bolts can be packed in small packages, cartons, and pallets for convenient storage, handling, and export transportation. Bulk packaging is suitable for distributors, engineering contractors, and industrial buyers. Customized packing labels, carton marks, and pallet arrangements can be discussed for wholesale and project orders.

FAQ

Q1: What material is this hex bolt made from?

A1: It is made from carbon steel.

Q2: What grades are available?

A2: The main listed grades are 4.8 and 8.8. Other available grade options include 10.9, and 12.9.

Q3: What surface treatments can be supplied?

A3: Available surface treatments include plain, zinc plated, black finish, and hot dip galvanized finish.

Q4: What sizes are listed for this product?

A4: The listed product includes M14‑250mm and M14‑300mm. A wider size range from M8 to M72 can be supplied.

Q5: Can matching nuts be supplied with the bolts?

A5: Yes. Nuts can be supplied, and two nuts per bolt are available according to the listed configuration.

Q6: What standards can this product follow?

A6: The bolt can be supplied according to DIN931, DIN933, ISO4014, ISO4017, and other common standards such as DIN, ASME, GB, JIS, and ISO.

Q7: Can the bolt be customized?

A8: Yes. Custom processing can be arranged according to drawings, samples, length requirements, surface treatment, and bulk order specifications.

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Send your bolt size, grade, surface treatment, quantity, and required standard to get a fast quotation.

We can support bulk supply, matching nut sets, customized sizes, export packaging, and project‑based procurement for hot dip galvanized carbon steel hex bolts.