DIN 6921 Hex Flange Bolts M6 M10 M12 Zinc Plated Black Steel Fasteners

These DIN 6921 hex flange bolts are designed for fastening work where stable clamping, easy installation, and a wider load-bearing surface are required. The flange head structure increases the contact area under the bolt head, helping reduce surface pressure on the connected part and improving installation stability in suitable assemblies.

The bolt can be supplied in steel, carbon steel, and stainless steel material options. Carbon steel is a practical choice for industrial fastening because it offers good strength, efficient production, and cost-effective bulk supply. Stainless steel can be selected when corrosion resistance or material appearance is important. For higher mechanical requirements, strength grades such as 8.8, 10.9, and 12.9 are available; grade 4.8 can be used for general fastening and lighter-duty applications.

Surface treatments include zinc and black finish. Zinc finish provides a clean metallic appearance and practical corrosion protection for storage, transport, indoor use, machinery assembly, and general hardware applications. Black finish is often selected for machinery, equipment, metal frames, and parts where a dark appearance is preferred.

Specification Table

Surface Treatment Options

Zinc finish is suitable for buyers who need a clean appearance, practical rust protection, and stable supply for general industrial fastening. It is commonly used for machinery parts, construction hardware, metal brackets, equipment assembly, repair parts, and distributor stock.

Black finish gives the flange bolt a darker industrial appearance and is suitable for machinery, equipment, frames, automotive-related parts, and assemblies where black fasteners are preferred. It can also help separate product lines by finish for different market channels or customer requirements.

For customized orders, surface treatment should be matched with the bolt material, grade, thread tolerance, working environment, and mating fasteners. Buyers can provide drawings, samples, or target application details to confirm the most suitable finish.

Application

DIN 6921 hex flange bolts are widely used in construction hardware, machinery manufacturing, equipment installation, industrial maintenance, steel frames, brackets, guard parts, agricultural machinery, automotive parts, warehouse racking, metal furniture, pipe supports, and general fastening work.

The integrated flange design is especially useful when the assembly needs a wider bearing surface under the bolt head. It can help simplify installation in many fastening positions and reduce the need for separate washer handling, depending on the structure and installation requirement.

Grade 4.8 bolts are suitable for general-purpose fastening. Grade 8.8 bolts are commonly selected for stronger machinery and industrial connections. Grade 10.9 and 12.9 bolts can be used for higher-strength applications where the mating parts, installation torque, and working load require stronger mechanical performance.

Matching Fasteners

Packing & Delivery

Products can be packed in bags, cartons, and pallets for bulk handling, warehouse storage, and export shipment. The listed single package size is 30 x 30 x 20 cm, with a single gross weight of 2.0 kg. Packaging can be adjusted according to bolt size, finish, order quantity, shipping method, and customer requirements.

Custom packaging, logo customization, carton labels, pallet packing, and market-specific packing solutions are available. Samples can be supplied for checking size, thread, finish, grade requirement, and assembly compatibility before bulk production.

Bulk supply is available from Handan, Hebei, China. Buyers can send the required standard, size, length, material, grade, surface treatment, quantity, and packing method to receive a suitable quotation and delivery plan.

FAQ

Q1: What is this product?

A1: This product is a DIN 6921 hex flange bolt, designed with a hex head and integrated flange for stable fastening and wider bearing support.

Q2: What material options are available?

A2: The listed material is steel. Material options include carbon steel and stainless steel.

Q3: What strength grades can be supplied?

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

Q4: What surface treatments are available?

A4: Zinc and black surface treatments are available.

Q5: What sizes are available?

A5: Common sizes include M6, M10, and M12. The available size range covers M5-M100.

Q6: What standards can these flange bolts follow?

A6: DIN 6921 is the main product standard. DIN and ANSI standard options are also available.

Q7: What applications are suitable for this product?

A7: It is suitable for construction, industrial assembly, machinery, equipment maintenance, steel components, brackets, frames, and general fastening work.

Q8: Can the bolts be customized?

A8: Yes. Custom logo, custom packaging, graphic customization, drawing-based customization, and sample-based customization are available.

Q9: What packaging is used?

A9: The bolts can be packed in bags, cartons, and pallets. Packaging can also be customized according to order requirements.

Q10: Where is the factory located?

A10: The factory is located in Handan, Hebei, China.

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Send your required DIN 6921 flange bolt size, length, material, grade, surface treatment, quantity, and packaging requirements to get a quotation.

We can support M6, M10, M12, and customized M5-M100 hex flange bolts for construction, machinery, industrial fastening, wholesale distribution, and OEM supply.