DIN6921 A2-70 A4-80 Stainless Steel Hex Flange Bolt, Metric Flanged Head Fastener for Industrial and Construction Applications

This DIN6921 hex flange bolt is designed for metric fastening applications in machinery, equipment assembly, construction and industrial production. The integrated flange under the hexagonal head provides a wider bearing surface than a standard hex bolt, helping distribute tightening pressure across the connected part.

The product is identified as a DIN6921 hex flange bolt. The head type is a hex head, and the listed standards are DIN and ANSI. The product is available in stainless steel and steel options, with the main listed grade shown as A2‑70. The model field also lists A2‑70 and A4‑80.

The listed surface information is Plain and Stainless Steel, providing a natural stainless steel appearance for the stainless steel version. The product is supplied from Hebei, Handan, China and supports bulk orders and customized logo, packaging and graphic services.

Specification Table

Surface Treatment Options

Plain Stainless Steel Finish

The plain stainless steel finish provides a natural metallic appearance and is suitable for stainless steel fastening assemblies. It can be used in equipment installation, machinery assembly and construction projects where a clean stainless steel surface is preferred.

The plain finish can also be selected when the buyer has a separate surface‑treatment or coating process. The final finish should be matched with the selected material and grade.

Application

This DIN6921 hex flange bolt can be used in a variety of applications, including:

• Machinery assembly
• Industrial equipment installation
• Construction fastening
• Steel component assembly
• Bracket and support installation
• Equipment frame connections
• Mechanical maintenance
• Automotive component fastening
• Production line equipment
• General metric fastening systems
• Stainless steel structure assembly
• Industrial repair and replacement work

The integrated flange increases the contact area under the bolt head and can help reduce the need for a separate flat washer in suitable assemblies. The hex head allows convenient installation with common tightening tools.

For stainless steel assemblies, A2‑70 or A4‑80 options can be selected according to the required corrosion resistance and working environment. For steel assemblies, the listed grades 4.8, 8.8, 10.9 and 12.9 can be considered according to the required load and tightening conditions.

Matching Fasteners

Use nuts and washers with the same nominal thread size and a compatible material and grade. Flat washers can be added when the connected surface requires additional load distribution. Spring washers or other locking components can be used when required by the assembly design.

For A2‑70 and A4‑80 stainless steel bolts, stainless steel matching nuts and washers are recommended for assemblies exposed to moisture or corrosive conditions.

Packing & Delivery

The product is listed with bags, cartons, boxes and pallet packaging options. The reference package size is 30 × 30 × 40 cm, with a reference gross weight of 25 kg.

Available delivery and packaging options include:

• Bag packing
• Carton or box packing
• Pallet packing for bulk orders
• Customized packaging
• Customized logo service
• Graphic customization
• Drawing‑based product customization
• Sample‑based service
• Bulk industrial orders
• Export shipment through Tianjin, Qingdao, Shanghai or Ningbo

FAQ

Q1: What type of bolt is this?

It is a DIN6921 hex flange bolt with an integrated flange under the hexagonal head.

Q2: What materials are available?

The product page lists stainless steel and steel.

Q3: What grades are listed?

The main listed grade is A2‑70. The model information also lists A2‑70 and A4‑80, while the detailed product information lists 4.8, 8.8, 10.9 and 12.9 as additional grade options.

Q4: What standards are listed?

The product information lists DIN and ANSI.

Q5: What sizes are available?

Displayed sizes include M3, M5, M7, M10, M14, M16, M20, M24 and M26, with additional sizes available according to the product listing and order requirements.

Q6: What lengths are available?

The listed lengths include 12 mm, 14 mm, 16 mm, 18 mm, 20 mm, 35 mm, 40 mm, 50 mm and 55 mm.

Q7: What surface treatment is available?

The listed surface information is plain and stainless steel.

Q8: Can the flange bolt be used without a flat washer?

The integrated flange provides a wider bearing surface, so a separate flat washer may not be necessary in every application. The final assembly should follow the engineering design.

Q9: Which nuts can be used with the bolt?

Use matching metric nuts with the same nominal size. For stainless steel bolts, matching stainless steel nuts are recommended where corrosion resistance is important.

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