M8x40mm M8x45mm DIN933 DIN931 Carbon Steel Hex Bolts Hot Dip Galvanized

These M8 hex head bolts are made from carbon steel and designed for stable fastening in industrial and construction applications. The hex head provides easy installation with common wrench and socket tools, making the bolts suitable for assembly lines, repair work, metal structures, machinery, and general fastening projects.

DIN933 and DIN931 standards are available to support different full‑thread and partial‑thread fastening needs. The wider size range can cover M8‑M72 for buyers who need multiple bolt diameters and lengths in one purchasing plan.

The available grade range includes 4.8, 6.8, 8.8, 10.9, and 12.9. Grade 4.8 and 6.8 are commonly used for general fastening, while grade 8.8, 10.9, and 12.9 can be selected for higher‑strength industrial applications. Surface treatment options include plain, zinc plated, black, and hot dip galvanized, allowing the bolt to be matched with indoor, machinery, and outdoor environments.

Specification Table

Key Features

• M8x40mm and M8x45mm hex bolt sizes for common industrial fastening needs.
• Carbon steel material for reliable strength and cost‑effective bulk supply.
• DIN933 and DIN931 standards for full‑thread and partial‑thread applications.
• Grade options from 4.8 to 12.9 for different load requirements.
• Plain, zinc plated, black, and hot dip galvanized finishes available.
• Hot dip galvanized option supports better corrosion resistance for outdoor use.
• Nuts can be supplied for complete bolt‑and‑nut fastening sets.
• Small pack, carton, and pallet packaging for wholesale and export orders.

Material and Grade Explanation

Carbon steel is widely used for hex bolts because it provides practical mechanical strength, stable processing quality, and economical purchasing for high‑volume orders. Grade 4.8 and 6.8 bolts are suitable for general fastening, equipment assembly, and light to medium‑duty metal connections.

For stronger fastening points, grade 8.8, 10.9, and 12.9 options can be selected according to the load requirement, installation torque, mating material, and working environment. Choosing the correct bolt grade helps improve fastening safety and long‑term reliability.

Surface Treatment Options

Plain finish is suitable for simple indoor fastening or further processing. Zinc plated finish provides a clean metallic appearance and general corrosion protection. Black finish is commonly used for machinery and equipment where a darker appearance is preferred. Hot dip galvanized finish is suitable for outdoor structures, construction projects, and environments where stronger rust resistance is needed.

Applications

These M8 carbon steel hex bolts can be used in machinery assembly, steel frames, equipment maintenance, construction hardware, warehouse racking, metal brackets, agricultural machinery, pipe supports, vehicle repair, and general industrial fastening.

They are suitable for buyers who need standard M8 sizes as well as a wider bolt family for project procurement. The M8‑M72 available range supports wholesale stock, engineering orders, and customized fastener supply.

Packaging and Supply

The bolts can be packed in small packs, cartons, and pallets for storage, handling, and export shipment. Packaging can be adjusted according to order quantity, shipping method, and buyer requirements. Bulk supply is available for distributors, contractors, machinery factories, hardware channels, and steel structure projects.

FAQ

Q1: What material are these M8 hex bolts made from?

A1: They are made from carbon steel.

Q2: What sizes are listed for this product?

A2: The listed sizes are M8x40mm and M8x45mm.

Q3: What grades are available?

A3: Available grades include 4.8, 6.8, 8.8, 10.9, and 12.9.

Q4: What surface treatments can be supplied?

A4: Plain, zinc plated, black, and hot dip galvanized finishes are available.

Q5: What standards can these bolts follow?

A5: DIN933 and DIN931 are the main listed standards. DIN, ASME, GB, JIS, and ISO options can also be supplied.

Q6: Can nuts be supplied with the bolts?

A6: Yes. Nuts can be supplied, and two nuts per bolt are available according to the listed configuration.

Q7: Can other sizes be ordered?

A7: Yes. The available size range can cover M8‑M72, and customized sizes can be discussed for bulk orders.

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Send your required size, grade, finish, quantity, and packaging request to get a fast quotation.

Hotop Fasteners can supply M8 DIN933 and DIN931 carbon steel hex bolts for machinery, construction, steel structure, wholesale, and export fastening projects.