Qi Sheng flange bolts feature an integrated flange under the head that helps distribute clamping force and can reduce the need for a separate washer in many assemblies. They are widely used in automotive components, equipment frames, and industrial connections where consistent load distribution and assembly efficiency are important.
We can supply flange bolts in different sizes, strength grades, materials, and corrosion-resistant finishes to fit your operating conditions. Bulk procurement and OEM packaging requirements are supported.
Share your bolt size, grade, finish, standard requirement, and quantity—our team will respond with suitable options and pricing.

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DIN251 Hexagon Socket Head with Serrated Flange Screws
DIN251 Hexagon Socket Head with Serrated Flange Screws

DIN251 Hexagon Socket Head with Serrated Flange Screws

1.Complies with DIN 251, ANSI B18.2.1M; serrated flange hex socket fasteners.

2.Material: Carbon steel (45#), stainless steel (304/316), alloy steel (42CrMo); strength grades 4.8–12.9.

3.Structure: Hex socket head + serrated flange (integrated) + full/half thread.

4.Surface treatments: Zinc plating, black oxide, passivation

5.Size M4–M16, length 6–50mm

DIN6921 Hexagon Flange Bolts Without Serrated
Hexagon flange bolts without serrated, made for mechanical fastening applications.

DIN6921 Hexagon Flange Bolts Without Serrated

1.Complies with ISO 4162, DIN 6921, ANSI B18.2.1; non-serrated flange hex bolts.

2.Material: Carbon steel (45#), stainless steel (304/316), alloy steel (42CrMo); strength grades 4.8–12.9.

3.Structure: Hex head + smooth integrated flange (no serrations) + full/half thread.

4.Surface treatments: Zinc plating, black oxide, hot-dip galvanizing

5.Size M6–M64, length 16–150mm.

Hexagon Flange Bolts with Serrated
High-quality hexagon flange bolt with serrated surface for secure fastening. Ideal for mechanical an.

Hexagon Flange Bolts with Serrated

  1. Complies with international standards such as DIN 6921, ISO 15072, and ASTM A325
  2. Features a one-piece structure integrating hexagon head, serrated flange, and threaded shank (full-thread or half-thread optional)
  3. Common materials include carbon steel (e.g., Q235, 45#), stainless steel (e.g., 304, 316), and alloy steel (e.g., 42CrMo)
  4. Strength grades range from 4.8 to 12.9, with high-strength variants undergoing quenching and tempering heat treatment
  5. Surface treatments include zinc plating, nickel plating, black oxide, or hot-dip galvanizing to enhance corrosion resistance
Torx Drive Hex Head Flange Bolts
Stainless steel Torx drive hex head flange bolts for mechanical assembly.

Torx Drive Hex Head Flange Bolts

  1. Complies with international standards such as ISO 14583, DIN 6921 (flange bolt base) and ISO 10664 (Torx drive)
  2. Integrating Torx drive, hex head, and flange design
  3. Belongs to high-precision fasteners, with a one-piece structure of hex head, flange (integrated washer), and Torx drive socket
  4. Common materials include carbon steel (e.g., 45#), stainless steel (e.g., 304, 316), and alloy steel (e.g., 42CrMo)
  5. Strength grades range from 4.8 to 12.9, with high-strength variants undergoing quenching and tempering heat treatment
  6. Surface treatments include zinc plating, nickel plating, black oxide, or hot-dip galvanizing to enhance corrosion resistance