Applications and selection
Assemblies that specify an integral bearing flange, subject to the mating surface and design requirements.
Confirm flange diameter, bearing-face form, thread and head dimensions. Do not assume every flange bolt has a serrated bearing face.
Dimensions & technical reference
DIN 6921:1983
Specify smooth or serrated bearing face on the order. The cited dimensions cover M5–M20; M24 inquiries require separate dimensional agreement.
| Nominal size | P · coarse | dc max | k max | s max | ds max |
|---|---|---|---|---|---|
| M5 | 0.8 | 11.8 | 5.4 | 8 | 5 |
| M6 | 1 | 14.2 | 6.6 | 10 | 6 |
| M8 | 1.25 | 18 | 8.1 | 13 | 8 |
| M10 | 1.5 | 22.3 | 9.2 | 15 | 10 |
| M12 | 1.75 | 26.6 | 11.5 | 16 | 12 |
| M14 | 2 | 30.5 | 12.8 | 18 | 14 |
| M16 | 2 | 35 | 14.4 | 21 | 16 |
| M20 | 2.5 | 43 | 17.1 | 27 | 20 |
Dimensional source: 164580 · DIN 6921:1983 ↗. “—” means no value listed for this combination. P is thread pitch; min / max are dimensional limits. The selection above is not the full standard or a stock list.
Catalog inquiry range: M5 - M24. Availability, lengths, grades and finishes are confirmed by quotation. Sizes outside the cited reference table require the applicable standard dimensions or an approved drawing. Quote the exact standard and edition; DIN, ISO and U.S. references are not automatically interchangeable.
Materials, surface finishes and standards
Materials for this series: Carbon Steel, Stainless Steel. Surface finishes: Black Oxide, Zinc Plated, HDG. Compatibility between the grade, finish and operating environment needs to be confirmed.
For titanium, nickel alloy or other non-ferrous requirements, include the exact material grade and drawing. Required mechanical properties, inspection documents and traceability should be stated in the inquiry.
Related U.S. references for hex flange screws. Flange diameter, serrations and property requirements must be specified. Standards from different systems can vary in dimensions, threads, product scope and test requirements. Confirm the exact designation and edition in the quotation.
Ordering standard
DIN 6921:1983
United States references for a separate inquiry: ASME B18.2.1 (inch); ASME B18.2.3.4M (metric). Confirm the exact form, thread system and drawing before quoting.
What to send for a quotation
- Hex flange bolts · DIN 6921 or your part number, with the relevant standard and edition.
- Exact dimensions, thread details, quantity and any critical tolerances.
- Material grade, surface finish, inspection requirements and delivery destination.
- For customization, a drawing revision and a description of the mating assembly.
Common questions about hex flange bolts · din 6921
Does a flange bolt eliminate the need for a washer?
That depends on the assembly specification and the bearing surface. Follow the joint drawing; an integral flange does not make a separate washer unnecessary in every application.
Can I request a size or material outside this listing?
Yes. Send the required dimensions and exact material grade for review. A quotation is needed to confirm feasibility, price and lead time.