Industrial Fastener · Bolts Series
Hex Flange Bolt
A hex flange bolt has an integrated washer-like flange under the hex head that distributes clamping load over a wider area, eliminating the need for a separate flat washer. Serrated flange variants (DIN 6921) provide additional anti-loosening grip on softer materials.
Product Overview
Hex Flange Bolt sourcing essentials
A hex flange bolt has an integrated washer-like flange under the hex head that distributes clamping load over a wider area, eliminating the need for a separate flat washer. Serrated flange variants (DIN 6921) provide additional anti-loosening grip on softer materials.
DIN 6921 (serrated), ISO 15071, JIS B 1189
8.8, 10.9, 12.9
Automotive chassis, agricultural machinery, light steel framing
Inspection records, lot labels, certificate options, and destination-ready packing.
Technical Data
Specification range
Final dimensions, mechanical properties, finish, and packing are confirmed against the RFQ and applicable standard.
| Standards | DIN 6921 (serrated), ISO 15071, JIS B 1189 |
|---|---|
| Property Class | 8.8, 10.9, 12.9 |
| Diameter Range | M6 – M20 |
| Flange Type | Smooth or serrated underside |
| Surface Finish | Zinc plated, Yellow zinc, Geomet, Dacromet |
| Common Application | Automotive chassis, agricultural machinery, light steel framing |
Common surface finishes
Select an option to review its sourcing note. Exact coating system, thickness, and corrosion requirement are confirmed with the order.
Quality Control
Checked before consolidation and export
Each order is matched to the specified standard and verified at practical control points before shipment.
RFQ confirmation
Standard, size, grade, pitch, finish, certificates, packing, and destination are locked before production.
Lot verification
Critical dimensions, thread fit, markings, finish appearance, and packing labels are sampled and recorded.
Shipment approval
Photos and required reports are organized before consolidated loading and export documentation.
Buyer Questions
Frequently asked questions
Why use a flange bolt instead of a hex bolt with a washer?
Flange bolts reduce parts count (one piece instead of two) and assembly time, and the integrated flange cannot be forgotten or installed backwards. Serrated flange bolts also provide a measure of vibration resistance on softer mating surfaces because the serrations bite into the surface.
Are serrated flange bolts reusable?
Reusing a serrated flange bolt on the same hardened mating surface is generally acceptable. However, on softer surfaces (aluminum, painted steel) the serrations leave permanent indentations, which can reduce clamping effectiveness on reuse. For critical assemblies, use a new bolt on each installation.
Ready to quote Hex Flange Bolt?
Send the standard, size, grade, finish, quantity, packing requirement, and destination. Availability and lead time are confirmed with the inquiry.